Relevant bibliographies by topics / DUSP5

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  4. Conference papers

Academic literature on the topic 'DUSP5'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "DUSP5"

1

Chen, Hsueh-Fen, Huai-Chia Chuang, and Tse-Hua Tan. "Regulation of Dual-Specificity Phosphatase (DUSP) Ubiquitination and Protein Stability." International Journal of Molecular Sciences 20, no. 11 (May 30, 2019): 2668. http://dx.doi.org/10.3390/ijms20112668.

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Mitogen-activated protein kinases (MAPKs) are key regulators of signal transduction and cell responses. Abnormalities in MAPKs are associated with multiple diseases. Dual-specificity phosphatases (DUSPs) dephosphorylate many key signaling molecules, including MAPKs, leading to the regulation of duration, magnitude, or spatiotemporal profiles of MAPK activities. Hence, DUSPs need to be properly controlled. Protein post-translational modifications, such as ubiquitination, phosphorylation, methylation, and acetylation, play important roles in the regulation of protein stability and activity. Ubiquitination is critical for controlling protein degradation, activation, and interaction. For DUSPs, ubiquitination induces degradation of eight DUSPs, namely, DUSP1, DUSP4, DUSP5, DUSP6, DUSP7, DUSP8, DUSP9, and DUSP16. In addition, protein stability of DUSP2 and DUSP10 is enhanced by phosphorylation. Methylation-induced ubiquitination of DUSP14 stimulates its phosphatase activity. In this review, we summarize the knowledge of the regulation of DUSP stability and ubiquitination through post-translational modifications.
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Lim, S., J. A. Green, H. Wong, M. E. VanderBurg, and T. Crook. "DUSP7 and DUSP8 promoter hypermethylations: Predictors of clinical outcomes in advanced epithelial ovarian carcinoma." Journal of Clinical Oncology 25, no. 18_suppl (June 20, 2007): 5501. http://dx.doi.org/10.1200/jco.2007.25.18_suppl.5501.

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5501 Background: The Dual specificity phosphatases (DUSPs) are a subclass of the protein tyrosine phosphatase (PTP) gene family which appears to be selective for dephosphorylating the critical phosphothreonine and phosphotyrosine residues within the mitogen-activated protein kinases (MAPKs) leading to inactivation. MAPK activation is a downstream target of several oncogenes and may give rise to oncogenic transformation, and hence DUSPs are potential tumor suppressor genes. The aim of this study was to investigate if DUSPs are subject to methylation-dependent silencing in epithelial ovarian cancer. Methods: In this study, promoter methylation and gene expression of the DUSPs genes (DUSP1, DUSP2, DUSP3, DUSP4, DUSP5, DUSP6, DUSP7, DUSP8 and DUSP10) were investigated in 9 ovarian cancer cell lines and in 74 primary epithelial ovarian tumors (Stage III/IV), using methylation specific PCR (MSP) and Reverse- transcription PCR (RT-PCR). The 74 clinical samples were retrospectively retrieved from a large Phase III RCT (the EORTC 55931/NCIC OV10) with clinical follow-up in excess of 6.5 years. Results: Ovarian Cancer Cell lines: Aberrant CpG methylation detected in DUSP1, DUSP2, DUSP4, DUSP6, DUSP7 and DUSP8. DUSP7 promoter methylation was associated with downregulation of mRNA expression. Primary Ovarian Tumors: Methylation of DUSP1, DUSP2, DUSP7 and DUSP8 was observed in 15–38% of the primary tumors. DUSP7 methylation is a predictor of adverse PFS in both univariate (median PFS 10.6 m versus 13.3m, p=0.002) and multivariate (Cox Regression HR 2.76, p<0.001) analyses, and is associated with a trend for poorer OS (22.1 m versus 29.3 m, p=0.07). In contrast, DUSP8 methylation is an independent predictor of favorable PFS (median 23.7m versus 11.5m; Cox Regression HR 0.30, p=0.006) and OS (HR 0.31, p=0.013). 5-year OS for DUSP8 methylated patients was 58.3% compared with 16.1% for DUSP8 unmethylated (HR 0.277, p=0.005). Conclusion: This is the first report of DUSP methylation in epithelial ovarian cancer. The study suggests that methylation-dependent transcriptional silencing of DUSP7 in advanced epithelial ovarian cancer may represent an independent predictor of adverse PFS. DUSP8 methylation, on the other hand, is a favorable clinical outcome marker. No significant financial relationships to disclose.
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Chuang and Tan. "MAP4K Family Kinases and DUSP Family Phosphatases in T-Cell Signaling and Systemic Lupus Erythematosus." Cells 8, no. 11 (November 13, 2019): 1433. http://dx.doi.org/10.3390/cells8111433.

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T cells play a critical role in the pathogenesis of systemic lupus erythematosus (SLE), which is a severe autoimmune disease. In the past 60 years, only one new therapeutic agent with limited efficacy has been approved for SLE treatment; therefore, the development of early diagnostic biomarkers and therapeutic targets for SLE is desirable. Mitogen-activated protein kinase kinase kinase kinases (MAP4Ks) and dual-specificity phosphatases (DUSPs) are regulators of MAP kinases. Several MAP4Ks and DUSPs are involved in T-cell signaling and autoimmune responses. HPK1 (MAP4K1), DUSP22 (JKAP), and DUSP14 are negative regulators of T-cell activation. Consistently, HPK1 and DUSP22 are downregulated in the T cells of human SLE patients. In contrast, MAP4K3 (GLK) is a positive regulator of T-cell signaling and T-cell-mediated immune responses. MAP4K3 overexpression-induced RORγt–AhR complex specifically controls interleukin 17A (IL-17A) production in T cells, leading to autoimmune responses. Consistently, MAP4K3 and the RORγt–AhR complex are overexpressed in the T cells of human SLE patients, as are DUSP4 and DUSP23. In addition, DUSPs are also involved in either human autoimmune diseases (DUSP2, DUSP7, DUSP10, and DUSP12) or T-cell activation (DUSP1, DUSP5, and DUSP14). In this review, we summarize the MAP4Ks and DUSPs that are potential biomarkers and/or therapeutic targets for SLE.
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Hahn, Cynthia K., Rachel J. West, Elizabeth R. Macari, Emily K. Schaeffer, and Christopher H. Lowrey. "Dual-Specificity Phosphatases (DUSPs) Are Potential Targets for Pharmacologic Induction of Fetal Hemoglobin." Blood 116, no. 21 (November 19, 2010): 2075. http://dx.doi.org/10.1182/blood.v116.21.2075.2075.

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Abstract Abstract 2075 Morbidities of sickle cell anemia and β-thalassemia can be alleviated by increased fetal hemoglobin (HbF) production. However, currently available HbF inducing agents, such as HU, butyrate, and DNA methyltransferase inhibitors are not ideal due to suppression of hematopoiesis and other short and long-term side effects. Our goal is to identify novel HbF induction strategies that have the safety, efficacy and ease of use to make them applicable to most hemoglobinopathy patients. Recently, we proposed that most inducing agents increase γ-globin gene expression through activation of cell stress signaling pathways, including the p38 MAPK pathway (Mabaera et al, Exp Hematol. 2008). Evidence supporting the involvement of p38 signaling in HbF induction includes publications from multiple groups showing that γ-globin mRNA induction by several agents activates p38 signaling and can be suppressed by inhibitors of p38. Our lab has shown that physical stresses such as hyperosmotic shock, UV and X-ray irradiation, and heat shock are capable of activating p38 and inducing γ-globin mRNA expression in erythroid cells that is blocked by SB203580, a p38 inhibitor. If our model is correct, strategies that increase p38 signaling without cellular stress could be therapeutically beneficial. One possible approach is inhibition of the dual-specificity phosphatases (DUSPs) that are induced by MAPK signaling and then feedback to dephosphorylate activated MAPKs including p38. If this model is correct, suppression of DUSP activity could increase basal levels of p38 signaling without stress. Regulation of specific MAPK pathways by different DUSPs is cell-type and stress-type dependent. To determine which DUSPs are likely to be involved in p38 signaling in erythroid cells, we first used RT-PCR to determine which of ten DUSPs that are known to modulate MAPK signaling (DUSPs 1, 2, 4, 5, 6, 7, 8, 9, 10, and 16) are expressed in human erythroid progenitors and K562 cells. All ten DUSPs were expressed in both cell types. Next, we determined the effects of hemin (10 and 20μM) and Na butyrate (1 and 2mM), two known inducers of HbF and p38 MAPK signaling, on mRNA levels of the ten DUSP genes in K562 cells. γ-globin mRNA was induced by both drugs at these doses. DUSP gene expression was assessed during a short time course ranging from 5 minutes to 5 hours and a longer time course from 24 to 72 hours. At early time points, DUSP5 expression was induced up to 4-fold with both drugs when compared to untreated controls. DUSP5 continued to have the greatest level of induction at later time points (up to 8-fold) while DUSP4 and DUSP6 reached maximum induction (up to 4-fold) at 72 hours. Treatment of K562 cells with a small molecule inhibitor of DUSP1 and DUSP6, (E)-2-benzylidene-3-(cyclohexylamino)-2,3-dihydro-1H-iden-1-one (BCI, gift of Dr. John Lazo) at 1μM increased γ-globin mRNA levels 5-fold, similar to levels seen with hemin and butyrate, and increased p38 phosphorylation by western blotting. Together, these data suggest that DUSPs may be a molecular target for the development of novel HbF inducing agents. Disclosures: No relevant conflicts of interest to declare.
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Bellou, Sofia, Mark A. Hink, Eleni Bagli, Ekaterini Panopoulou, Philippe I. H. Bastiaens, Carol Murphy, and Theodore Fotsis. "VEGF autoregulates its proliferative and migratory ERK1/2 and p38 cascades by enhancing the expression of DUSP1 and DUSP5 phosphatases in endothelial cells." American Journal of Physiology-Cell Physiology 297, no. 6 (December 2009): C1477—C1489. http://dx.doi.org/10.1152/ajpcell.00058.2009.

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Vascular endothelial growth factor (VEGF) is a key angiogenic factor that regulates proliferation and migration of endothelial cells via phosphorylation of extracellular signal-regulated kinase-1/2 (ERK1/2) and p38, respectively. Here, we demonstrate that VEGF strongly induces the transcription of two dual-specificity phosphatase (DUSP) genes DUSP1 and DUSP5 in endothelial cells. Using fluorescence microscopy, fluorescence lifetime imaging (FLIM), and fluorescence cross-correlation spectroscopy (FCCS), we found that DUSP1/mitogen-activated protein kinases phosphatase-1 (MKP-1) was localized in both the nucleus and cytoplasm of endothelial cells, where it existed in complex with p38 (effective dissociation constant, KDeff, values of 294 and 197 nM, respectively), whereas DUSP5 was localized in the nucleus of endothelial cells in complex with ERK1/2 ( KDeff 345 nM). VEGF administration affected differentially the KDeff values of the DUSP1/p38 and DUSP5/ERK1/2 complexes. Gain-of-function and lack-of-function approaches revealed that DUSP1/MKP-1 dephosphorylates primarily VEGF-phosphorylated p38, thereby inhibiting endothelial cell migration, whereas DUSP5 dephosphorylates VEGF-phosphorylated ERK1/2 inhibiting proliferation of endothelial cells. Moreover, DUSP5 exhibited considerable nuclear anchoring activity on ERK1/2 in the nucleus, thereby diminishing ERK1/2 export to the cytoplasm decreasing its further availability for activation.
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Ferguson, Bradley S., Sara A. Wennersten, Kimberly M. Demos-Davies, Marcello Rubino, Emma L. Robinson, Maria A. Cavasin, Matthew S. Stratton, et al. "DUSP5-mediated inhibition of smooth muscle cell proliferation suppresses pulmonary hypertension and right ventricular hypertrophy." American Journal of Physiology-Heart and Circulatory Physiology 321, no. 2 (August 1, 2021): H382—H389. http://dx.doi.org/10.1152/ajpheart.00115.2021.

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Dual-specificity phosphatases (DUSPs) serve critical roles in the regulation of mitogen-activated protein kinases, but their functions in the cardiovascular system remain poorly defined. Here, we provide evidence that DUSP5, which resides in the nucleus and specifically dephosphorylates extracellular signal-regulated kinase (ERK1/2), blocks pulmonary vascular smooth muscle cell proliferation. In response to angiotensin II infusion, mice lacking DUSP5 develop pulmonary hypertension and right ventricular cardiac hypertrophy. These findings illustrate DUSP5-mediated suppression of ERK signaling in the lungs as a protective mechanism.
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Kidger, Andrew M., Linda K. Rushworth, Julia Stellzig, Jane Davidson, Christopher J. Bryant, Cassidy Bayley, Edward Caddye, Tim Rogers, Stephen M. Keyse, and Christopher J. Caunt. "Dual-specificity phosphatase 5 controls the localized inhibition, propagation, and transforming potential of ERK signaling." Proceedings of the National Academy of Sciences 114, no. 3 (January 4, 2017): E317—E326. http://dx.doi.org/10.1073/pnas.1614684114.

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Deregulated extracellular signal-regulated kinase (ERK) signaling drives cancer growth. Normally, ERK activity is self-limiting by the rapid inactivation of upstream kinases and delayed induction of dual-specificity MAP kinase phosphatases (MKPs/DUSPs). However, interactions between these feedback mechanisms are unclear. Here we show that, although the MKP DUSP5 both inactivates and anchors ERK in the nucleus, it paradoxically increases and prolongs cytoplasmic ERK activity. The latter effect is caused, at least in part, by the relief of ERK-mediated RAF inhibition. The importance of this spatiotemporal interaction between these distinct feedback mechanisms is illustrated by the fact that expression of oncogenic BRAFV600E, a feedback-insensitive mutant RAF kinase, reprograms DUSP5 into a cell-wide ERK inhibitor that facilitates cell proliferation and transformation. In contrast, DUSP5 deletion causes BRAFV600E-induced ERK hyperactivation and cellular senescence. Thus, feedback interactions within the ERK pathway can regulate cell proliferation and transformation, and suggest oncogene-specific roles for DUSP5 in controlling ERK signaling and cell fate.
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Ke, Xingrao, Robert A. McKnight, Diana Caprau, Shannon O'Grady, Qi Fu, Xing Yu, Christopher W. Callaway, Kurt H. Albertine, and Robert H. Lane. "Intrauterine growth restriction affects hippocampal dual specificity phosphatase 5 gene expression and epigenetic characteristics." Physiological Genomics 43, no. 20 (October 2011): 1160–69. http://dx.doi.org/10.1152/physiolgenomics.00242.2010.

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Intrauterine growth retardation (IUGR) predisposes humans toward hippocampal morbidities, such as impaired learning and memory. Hippocampal dual specificity phosphatase 5 (DUSP5) may be involved in these morbidities because DUSP5 regulates extracellular signal-regulated kinase phosphorylation (Erk). In the rat, IUGR causes postnatal changes in hippocampal gene expression and epigenetic characteristics. However, the impact of IUGR upon hippocampal DUSP5 expression and epigenetic characteristics is not known. We therefore hypothesized that IUGR affects hippocampal 1) DUSP5 expression, DNA CpG methylation, and histone code, and 2) erk1/2 phosphorylation in a well-characterized rat model of IUGR. We found that IUGR significantly decreased DUSP5 expression in the day of life (DOL) 0 and 21 male rat, while decreasing only DUSP5 protein levels in the DOL21 female rat. Fluorescent in situ hybridization and immunohistochemistry analyses localized the changes in DUSP5 mRNA and protein, many of which occurred in the dentate gyrus. IUGR also caused sex-specific differences in DNA CpG methylation and histone code in two sites of the hippocampal DUSP5 gene, a 5′-flanking specificity protein-1 (SP1) site and exon 2. Finally, when IUGR decreased DUSP5 protein levels, Erk phosphorylation increased. We conclude that IUGR affects hippocampal DUSP5 expression and epigenetic characteristics in a sex-specific manner.
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Alleboina, Satyanarayana, Dawit Ayalew, Rahul Peravali, Lingdan Chen, Thomas Wong, and Ayotunde O. Dokun. "Dual specificity phosphatase 5 regulates perfusion recovery in experimental peripheral artery disease." Vascular Medicine 24, no. 5 (August 26, 2019): 395–404. http://dx.doi.org/10.1177/1358863x19866254.

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Peripheral artery disease (PAD) is caused by atherosclerotic occlusions of vessels outside the heart, particularly those of the lower extremities. Angiogenesis is one critical physiological response to vessel occlusion in PAD, but our understanding of the molecular mechanisms involved in angiogenesis is incomplete. Dual specificity phosphatase 5 (DUSP5) has been shown to play a key role in embryonic vascular development, but its role in post-ischemic angiogenesis is not known. We induced hind limb ischemia in mice and found robust upregulation of Dusp5 expression in ischemic hind limbs. Moreover, in vivo knockdown of Dusp5 resulted in impaired perfusion recovery in ischemic limbs and was associated with increased limb necrosis. In vitro studies showed upregulation of DUSP5 in human endothelial cells exposed to ischemia, and knockdown of DUSP5 in these ischemic endothelial cells resulted in impaired endothelial cell proliferation and angiogenesis, but did not alter apoptosis. Finally, we show that these effects of DUSP5 on post-ischemic angiogenesis are a result of DUSP5-dependent decrease in ERK1/2 phosphorylation and p21 protein expression. Thus, we have identified a role of DUSP5 in post-ischemic angiogenesis and implicated a DUSP5-ERK-p21 pathway that may serve as a therapeutic target for the modulation of post-ischemic angiogenesis in PAD.
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Román-García, Pablo, Natalia Carrillo-López, Manuel Naves-Díaz, Isabel Rodríguez, Alberto Ortiz, and Jorge B. Cannata-Andía. "Dual-Specificity Phosphatases Are Implicated in Severe Hyperplasia and Lack of Response to FGF23 of Uremic Parathyroid Glands from Rats." Endocrinology 153, no. 4 (February 14, 2012): 1627–37. http://dx.doi.org/10.1210/en.2011-1770.

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Phosphate load accelerates the progression of secondary hyperparathyroidism (sHPT). In advanced stages of sHPT, there is a marked hyperplasia and resistance to classical regulatory endocrine factors such as calcium, calcitriol, or fibroblast growth factor 23 (FGF23), which suppresses PTH secretion by an ERK-dependent mechanism. Nephrectomized rats were fed with a high- or normal-phosphorus diet for different periods of time to induce sHPT. Biochemical parameters, parathyroid gland microarrays, quantitative real-time PCR, and immunohistochemistry (ERK/phospho-ERK) were performed. To test the role of dual-specificity phosphatases (Dusp) on parathyroid gland regulation, normal parathyroid glands were cultured with FGF23 and Dusp. Uremic rats fed with a high-phosphorus diet showed more severe sHPT, higher serum FGF23 levels and mortality, and decreased parathyroid Klotho gene expression. In all stages of sHPT, parathyroid microarrays displayed a widespread gene expression down-regulation; only a few genes were overexpressed, among them, Dusp5 and -6. In very severe sHPT, a significant reduction in phospho-ERK (the target of Dusp) and a significant increase of Dusp5 and -6 gene expression were observed. In ex vivo experiments with parathyroid glands, Dusp partially blocked the effect of FGF23 on PTH secretion, suggesting that Dusp might play a role in parathyroid regulation. The overexpression of Dusp and the inactivation of ERK found in the in vivo studies together with the ex vivo results might be indicative of the defense mechanism triggered to counteract hyperplasia, a mechanism that can also contribute to the resistance to the effect of FGF23 on parathyroid gland observed in advanced forms of chronic kidney disease.
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Dissertations / Theses on the topic "DUSP5"

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Emond-Boisjoly, Marc-Alexandre. "Rôle de la protéine DUSP5 dans l’autophagie des cardiomyocytes." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8908.

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Résumé: L’autophagie est un processus essentiel au maintien de l’homéostasie cellulaire. Elle permet de dégrader et recycler aussi bien des organelles entières que des composants cytoplasmiques non fonctionnels. De plus, l’augmentation d’autophagie en condition de stress constitue une réponse adaptative favorisant la survie cellulaire. Chez les cardiomyocytes, l’autophagie en condition basale est indispensable au renouvellement, entre autres, des mitochondries et des protéines formant les sarcomères. De plus, les stress tels l’ischémie cardiaque ou la carence en nutriments induisent une augmentation de l’autophagie protectrice. Dans certaines conditions extrêmes, il a été suggéré qu’un surcroît d’autophagie puisse toutefois exacerber la pathologie cardiaque en provoquant la mort des cardiomyocytes. Considérant l’importance de ce processus dans la physiopathologie cardiaque, l’identification des mécanismes signalétiques régulant l’autophagie chez les cardiomyocytes a été le sujet de recherches intenses. À cet effet, l’activation des Mitogen-Activated Protein Kinase (MAPK) a été démontrée pour réguler, avec d’autres voies signalétiques, l’autophagie et l’apoptose des cardiomyocytes. Il est donc probable que les Dual-Specificity Phosphatase (DUSP), enzymes clés contrôlant l’activité des MAPK, participent aussi à la régulation de l’autophagie. Afin de vérifier cette hypothèse, nous avons induit l’autophagie chez des cardiomyocytes isolés de rats nouveau-nés en culture. L’analyse de marqueurs d’autophagie par immunobuvardage démontre que l’activation des MAPK ERK1/2 et p38 corrèle avec l’activité autophagique chez les cardiomyocytes. Dans ces conditions, la diminution d’expression de la majorité des ARNm encodant les différentes DUSP retrouvées chez les cardiomyocytes contraste de façon marquée avec l’augmentation d’expression de l’ARNm Dusp5. De plus, nous avons démontré par une étude de gain de fonction que l’activation soutenue de p38 par surexpression d’un mutant MKK6 constitutivement actif stimule l’autophagie chez les cardiomyocytes. De façon surprenante, la perte de fonction de p38 obtenue par surexpression d’un mutant p38 dominant négatif n’altère en rien la réponse autophagique initiatrice dans notre modèle in vitro. Nos résultats suggèrent que les DUSP puissent réguler, via leurs actions sur les MAPK, d’importantes étapes du processus autophagique chez les cardiomyocytes.
Abstract: Autophagy is a process essential to the maintenance of cellular homeostasis. It helps degrade and recycle whole organelles and nonfunctional cytoplasmic components. In addition, the adaptative up regulation of autophagy in stress condition promotes cell survival. In cardiomyocytes basal autophagy is essential to the renewal of, among others, mitochondria and proteins forming sarcomeres. In addition, stresses such as ischemic heart or nutrient deficiency induce an increase in protective autophagy. In extreme conditions, it has been suggested that autophagy may exacerbate cardiac disease causing the death of cardiomyocytes. Considering the importance of this process in cardiac pathophysiology, identify ing safety mechanisms regulating autophagy in cardiomyocytes has been the subject of intense research. To this end, activation of mitogen-activated protein kinase (MAPK) has been demonstrated to regulate, with other signaling pathways, autophagy and cardiomyocyte apoptosis. It is therefore likely that Dual-Specificity Phosphatases (DUSPs), key enzymes that control the activity of MAPKs, also participate in the regulation of autophagy. To test this hypothesis, we have induced autophagy in isolated cardiomyocytes of newborn rats in culture. Analysis of autophagy markers by immunoblotting demonstrated that the activation of MAPKs ERK1/2 and p38 correlates with autophagic activity in cardiomyocytes. Under these conditions, the decrease in expression of the majority of mRNAs encoding different DUSPs found in cardiomyocytes contrast sharply with the increase mRNA expression of Dusp5. Furthermore, we demonstrated by again of function study that sustained activation of p38 by overexpression of a constitutively active MKK6 mutant stimulates autophagy in cardiomyocytes. Surprisingly, the loss of p38 function obtained by overexpression of a dominant negative p38 mutant does not affect the autophagic response in our in vitro model, but increases the lipidation of autophagosomes marker LC3. Our results suggest that DUSPs can regulate, through their actions on MAPKs, important stages of autophagy in cardiomyocytes.
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Buffet, Camille. "Anomalies moléculaires de la voie MAPK et cancer papillaire de la thyroïde : étude de deux phosphatases spécifiques de ERK, DUSP5 et DUSP6." Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05T049/document.

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Le cancer papillaire de la thyroïde (CPT) est la tumeur endocrine la plus fréquente. Des anomalies moléculaires activant la voie des MAPK (Mitogen-Activated Protein Kinases) sont identifiées, de façon mutuellement exclusive, dans environ 70% des cas. Il s’agit de réarrangements chromosomiques, le plus souvent de type RET/PTC (10%), de mutations ponctuelles activatrices des trois isoformes de l’oncogène RAS (H, N et K-RAS) (10%), ou de l’oncogène B-RAF (50%). La mutation « hot spot » B-RAFV600E est la plus fréquemment identifiée, elle est associée à une plus grande agressivité clinique (diagnostic à un stade tardif, risque de récidives et de décès accru). Ces évènements moléculaires ont pour conséquence commune l’activation de la voie des MAPK, se traduisant en aval par la phosphorylation de MEK (Mitogen-activated Extracellular signal-Regulated Kinase) puis de ERK (Extracellular signal-Regulated Kinase). Cette dernière est régulée négativement par des phosphatases, appartenant à la famille des Dual Specificity Phosphatases (DUSPs), d’expression ubiquitaire, et en particulier de deux phosphatases spécifiques de ERK, l’une cytoplasmique (DUSP6) et l’autre nucléaire (DUSP5). Nous avons fait l’hypothèse que ces phosphatases pouvaient être soit des gènes suppresseurs de tumeurs (leur perte d’expression conduisant à une augmentation de phosphorylation de ERK et une prolifération accrue), soit des marqueurs du degré d’activation de la voie MAPK dans le cadre d’une boucle de rétrocontrôle négatif. Ceci nous a conduits à analyser la régulation et l’expression de ces phosphatases dans trois modèles : la lignée cellulaire PCCL3 (thyroïde de rat), exprimant l’un des trois principaux oncogènes mutés dans les CPT (RET/PTC3 ou H-RASV12 ou B-RAFV600E) sous le contrôle d’un promoteur inductible par la doxycycline, des lignées cellulaires humaines dérivant de CPT et des CPT humains. (...)
Papillary thyroid cancer (PTC) is the most common endocrine malignancy. Mutually exclusive and activating alterations of the MAPK pathway (Mitogen-Activated Protein Kinases) are identified in 70% of cases. Common mutations found in PTCs are point mutation of the B-RAF (50%) and RAS genes (10%) as well as RET/PTC chromosomal rearrangements (10%). The hot spot B-RAFV600E mutation is the most frequently alteration identified and is connected with agressive clinical characteristics (high stage at diagnosis, high recurrence risk and death). These molecular events lead to constitutive activation of the MAPK pathway, resulting in MEK (Mitogen-activated Extracellular signal-Regulated Kinase) and ERK (Extracellular signal-Regulated Kinase) phosphorylation. ERK is negatively regulated by phosphatases and among them, Dual Specificity Phosphatases (DUSPs), ubiquitary expressed, in particular two ERK-specific phosphatases DUSP5 (nuclear) and DUSP6 (cytosolic). We hypothesized that these phosphatases could have tumor supressor properties (i.e. their loss would be associated with an increase in MAPK pathway activation) or may serve as a surrogate marker of MAPK pathway activation in the context of a negative feedback loop. We analysed regulation and expression of both phosphatases in 3 models: three PCCL3 cell lines (rat thyroid cells) expressing one of the most common oncogene identified in PTCs (RET/PTC3 or H-RASV12 or B-RAFV600E) under the control of a doxycycline-inducible promoter, human PTC-derived cell lines and human PTC. We demonstrated that MAPK pathway activation was correlated with induction of DUSP5 and DUSP6. These phosphatases are involved in a negative feedback loop that contributes to a tight regulation of phospho-ERK levels. DUSP5 and DUSP6 mRNA are overexpressed in human PTCs, especially in B-RAF mutated tumors suggesting a higher MAPK signaling output in these agressive PTCs. Silencing of DUSP5 and/or DUSP6 by small interfering RNA does not affect proliferation of human B-RAFV600E thyroid carcinoma-derived cell lines, suggesting the lack of tumor suppressor gene role. Compensatory changes in expression of DUSPs when a specific one is inactivated may explain this lack of effect. On the opposite, a DUSP6 pharmacological inhibitor induced a concentration dependent decrease in proliferation of human B-RAFV600E cells, suggesting « off-target » effect of this inhibitor. In a second part, we analysed the regulation of DUSP5 expression, which is a target of the MAPK pathway activation. We demonstrated, using pharmacological inhibitors, that DUSP5 is an early response gene, regulated mostly by the MAPK pathway, at the transcriptional level. Two contiguous CArG boxes that bind serum response factor (SRF) were found in a 1Kb promoter region, as well as several E twenty-six transcription factor family binding sites (EBS). These sites potentially bind Elk-1, a transcription factor activated by ERK1/2. Using wild type or mutated DUSP5 promoter reporters, we demonstrated that SRF plays a crucial role in serum induction of DUSP5 promoter activity, the proximal CArG box being important for SRF binding in vitro and in living cells. Moreover Elk-1 was bound in vitro to a promoter region containing the proximal CArG box and a putative EBS. Its specific binding to SRF was necessary to elicit promoter response to dominant positive Elk-VP16 and to enhance the response to serum stimulation. Altogether our results suggest that the MAPK pathway is more active in B-RAFV600E PTC than in PTC with other genetic alteration and could explain their clinical agressivity. DUSP5 and DUSP6, as well as phosphorylated MEK, are markers of activation of the MAPK pathway. Neither phosphatase has tumor suppressor properties in our thyroid cancer cell models. Our results suggest redundancy and functional compensation among DUSPs. (...)
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Manley, Grace C. A. "The roles of DUSPs in respiratory viral infection." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19257/.

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Intriago, Rachel Elizabeth. "Role and regulation of DUSP-1 in GnRH signaling." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p1465076.

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Thesis (M.S.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed June 19, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 55-57).
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Patterson, Kate Isabel Garvan Institute of Medical Research Faculty of Medicine UNSW. "Characterisation of the atypical dual specificity phosphatase DUSP26." Publisher:University of New South Wales. Garvan Institute of Medical Research, 2009. http://handle.unsw.edu.au/1959.4/43594.

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In many ways cancer is a disease of cellular signalling disequilibrium. When the equilibrium of key signalling pathways is upset, critical biological functions such as cell growth, survival, motility, proliferation, metabolism and apoptosis are affected, and can lead to the initiation of cancer. Reversible protein phosphorylation is an extremely important mechanism by which the activity of enzymes and proteins in signalling cascades can be regulated. Dual specificity phosphatases (DUSPs) are a unique subgroup of the protein tyrosine phosphatases (PTPs) in that they can dephosphorylate both phospho-tyrosine and phospho-serine/threonine residues within the one substrate. Many DUSPs have been implicated in cancer as critical regulators of key cancer- associated signalling cascades including the mitogen activated protein kinase (MAPK) pathway. Transcript profiling of 51 primary ovarian tumours and four normal ovaries as controls identified an uncharacterised atypical DUSP, DUSP26 as being potentially down-regulated in all histological subtypes of ovarian cancer compared with normal ovaries. DUSP26 is located at 8p12, a chromosomal region previously shown to exhibit allelic imbalance in ovarian cancer. DUSP26 is predominantly expressed in neuro-endocrine tissue, with high expression also in skeletal muscle, prostate and ovary. DUSP26 mRNA expression is reduced in brain cancer, neuroblastoma, and ovarian cancer cell lines compared to normal, consistent with a role for DUSP26 as a tumour suppressor gene. Furthermore, DUSP26 can negatively affect the proliferation of epithelial cells, also consistent with a role as a tumour suppressor gene. Expression of DUSP26 in primary ovarian cancer samples is variable however, and analysis of DUSP26 protein expression is required to reconcile these results. Preliminary results suggest that DUSP26 is epigenetically regulated and that hypermethylation may contribute to its silencing in cancer. In the literature, there is great controversy in regards to the substrate specificity of DUSP26. Results presented in this thesis conclusively demonstrate that DUSP26 is not a MAPK phosphatase, despite reports to the contrary. Instead, using a substrate trapping approach, two novel potential DUSP26 substrates were identified: DNA-dependent protein kinase (DNA-PK) and nuclear mitotic apparatus protein (NuMA), which are often dysregulated in cancer. Consequently, DUSP26 may affect the pathogenesis of cancer via DNA-PK and or NuMA.
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Moreaux, Guenievre. "Investigating downstream effectors of KRas signalling in vivo : Dusp6 and Fra1." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/4056/.

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Arkell, Rebecca Sarah. "Investigations into the regulation of DUSP6 expression in normal and tumour cells." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611087.

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Li, Weiling. "Genetic changes in melanoma progression." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5595.

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Melanoma is a highly aggressive tumour with a poor prognosis for patients with advanced disease because it is resistant to current therapies. Therefore, the development of novel strategies for melanoma treatment is important. The characterization of the molecular mechanisms underlying melanoma proliferation, progression, and survival could help the development of novel targeted melanoma treatments. The MAPK and PI3K pathways both play important roles in melanoma progression. In the MAPK pathway, DUSP6, which acts as a phosphatase to negatively control the activation of ERK1/2, is involved in the development of human cancers. The MAPK pathway also regulates expression of the DNA repair gene ERCC1 following EGF treatment. ERCC1 is essential for nucleotide excision repair, which is one of the major systems for removal of cisplatin induced DNA lesions. The aims of this project were: 1, to investigate the molecular changes in our immortal mouse melanocyte cell lines that were needed for them to form tumours in a xenograft model; 2, to investigate whether the MAPK pathway regulates ERCC1 following cisplatin treatment and protects melanoma cells from death. Through comparison of the RAS/RAF/MEK/ERK (MAPK) and the PI3K/AKT (AKT) signalling pathways between our immortal mouse melanocyte cell lines and their tumour derivatives in our xenograft model, we identified a molecularly distinct subtype of mouse melanoma characterized by reduced ERK and AKT activity and increased expression of DUSP6. Functional analyses employing ectopic overexpression indicated that increased expression of DUSP6 enhanced anchorage independent growth ability and invasive ability in our mouse melanocytes, suggesting that increased DUSP6 expression may contribute to melanoma formation in the xenograft assay. We also demonstrated that higher expression of p-ERK suppressed invasion, but not anchorage independent growth, in our subtype of mouse melanoma by enforced expression of constitutively active MEK1 and MEK2. In addition, the role of DUSP6 in classical human melanoma was investigated in this Genetic changes in melanoma progression study. Inhibition of anchorage independent growth and invasion were observed after exogenous expression of DUSP6 in human melanoma cells. This suggested that DUSP6 played different roles in classic human melanoma than in our distinct subtype of mouse melanoma. Our study also investigated the phosphorylation level of ERK1/2 and the mRNA and protein level of ERCC1 and its partner XPF in the human melanoma cell line following cisplatin treatment. Significant increases in expression of p-ERK, ERCC1 and XPF were found in cisplatin treated cells. Moreover, a MEK inhibitor inhibited ERCC1 induction by cisplatin, but did not significantly affect XPF induction. This suggested that the MAPK pathway was involved in regulation of ERCC1 but not XPF. Furthermore, the DUSP6 level decreased after cisplatin treatment and overexpression of DUSP6 inhibited ERCC1 and XPF induction and reduced resistance to cisplatin. DUSP6 seems to play a crucial role in resistance of melanoma to cisplatin. In addition, a novel larger ERCC1 transcript was identified in human cell lines and was found to be upregulated by cisplatin. The ratio of larger ERCC1 transcript relative to the normal ERCC1 transcript increased following cisplatin treatment. The functions of this larger ERCC1 transcript in cisplatin resistance deserve further study.
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Casteel, Maximilian Wilhelm. "Bedeutung von DUSP1 und Expression MAPKinasen-spezifischer Transkriptionsfaktoren während der zellulären Antwort auf Deoxynivalenol." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-128239.

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Abraham, Sonya Marie. "Dual specificity phosphatase 1 (DUSP1): an important regulator of the anti-inflammatory actions of glucocorticoids?" Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486756.

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The Mitogen Activated Protein Kinases (MAPKs) are a family of serine/threonine kinases that orchestrate changes in gene expression in response to extracellular stimuli. The c-Jun N-terminal kinase (JNK) and p38 MAPK subfamilies are strongly activated by pro-inflammatory stimuli such as UV light, cytokines such as Interleukin-l (IL-I), and pathogen-associated molecules, for example lipopolysaccharide (LPS). The JNK and p38 signalling pathways control the expression of many inflammatory mediators, including tumour necrosis factor a (lNFa) and cyclooxygenase 2 (COX-2). Activation of MAPKs requires their phosphorylation at particular threonine and tyrosine residues. Conversely, inactivation of the MAPKs is achieved by removal of the activating phosphate groups by various threonine / serine-, tyrosine-, or dual specificity phosphatases. This phosphatase-mediated inactivation ofp38 and JNK is thought to be critical for limiting the strength and duration ofan inflammatory response.We and others have shown that the dual-specificity phosphatase, DUSPI is transiently upregulated by proinflammatory stimuli such as UV light, IL-I or LPS. It is also upregulated in a more sustained fashion by the glucocorticoid dexamethasone, a powerful anti-inflammatory agonist. The induction of DUSPI gene expression coincides with the inactivation of JNK and p38. We hypothesised that DUSPI plays a role in the limitation of inflammatory responses via a negative feedback loop, and that the sustained induction of DUSPI contributes to the anti-inflammatory effects ofglucocorticoids. To test these hypotheses we have investigated inflammatory responses of cells from a DUSPI knock-out mouse.
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Book chapters on the topic "DUSP5"

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Monteiro, Lucas Falcão, Pault Yeison Minaya Ferruzo, Lilian Cristina Russo, Jessica Oliveira Farias, and Fábio Luís Forti. "DUSP3/VHR: A Druggable Dual Phosphatase for Human Diseases." In Reviews of Physiology, Biochemistry and Pharmacology, 1–35. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/112_2018_12.

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"DUSP1." In Encyclopedia of Pain, 1082. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_100662.

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"DUSP6." In Encyclopedia of Pain, 1082. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_100663.

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"Dual-specificity Phosphatases (DUSP)." In Encyclopedia of Pain, 1081. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_100657.

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Furukawa, Toru, and Akira Horii. "The Role of DUSP6/MKP-3 in Pancreatic Carcinoma." In Handbook of Immunohistochemistry and in situ Hybridization of Human Carcinomas, Volume 3 - Molecular Genetics, Liver Carcinoma, and Pancreatic Carcinoma, 335–39. Elsevier, 2005. http://dx.doi.org/10.1016/s1874-5784(05)80038-8.

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Upadhyay, HC, MA Lawson, and B. Gangapurkar. "Regulation of DUSP1 Translation by GnRH in the LβT2 Pituitary Gonadotrope Cell Line." In The Endocrine Society's 92nd Annual Meeting, June 19–22, 2010 - San Diego, P3–224—P3–224. Endocrine Society, 2010. http://dx.doi.org/10.1210/endo-meetings.2010.part3.p5.p3-224.

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Chen, Chien-Cheng, and Carole R. Mendelson. "Sp1 Response Elements within the MAPK Phosphatase-1 (MKP-1/DUSP1) Promoter Mediate Progesterone Receptor (PR) Induced MKP-1 Expression in Breast Cancer Cells." In Posters I, P3–13—P3–13. Endocrine Society, 2010. http://dx.doi.org/10.1210/endo-meetings.2010.part3.p1.p3-13.

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Conference papers on the topic "DUSP5"

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Andrade, Pamela V., Mariana T. Ruckert, Carlos Alberto O. Biagi Junior, and Vanessa S. Silveira. "Abstract C51: Targeted inhibition of DUSP1 and DUSP6 suppresses pancreatic adenocarcinoma cells’ growth and glucose metabolism via SAPK/JNK pathway activation." In Abstracts: AACR Special Conference on Pancreatic Cancer: Advances in Science and Clinical Care; September 6-9, 2019; Boston, MA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.panca19-c51.

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Tsai, Shaw-Jenq, Chu-An Wang, and I.-Heng Chang. "Abstract 1786: Effect of DUSP2 on pancreatic cancer lymphatic dissemination." In Proceedings: AACR Annual Meeting 2019; March 29-April 3, 2019; Atlanta, GA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.am2019-1786.

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Tsai, Shaw-Jenq, Chu-An Wang, and I.-Heng Chang. "Abstract 1786: Effect of DUSP2 on pancreatic cancer lymphatic dissemination." In Proceedings: AACR Annual Meeting 2019; March 29-April 3, 2019; Atlanta, GA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.sabcs18-1786.

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Wu, CE, TS Koay, A. Esfandiari, YH Ho, P. Lovat, and J. Lunec. "PO-450 MEK inhibition synergizes with MDM2 inhibitors through DUSP6 suppression." In Abstracts of the 25th Biennial Congress of the European Association for Cancer Research, Amsterdam, The Netherlands, 30 June – 3 July 2018. BMJ Publishing Group Ltd, 2018. http://dx.doi.org/10.1136/esmoopen-2018-eacr25.471.

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Xu, Jianing, Hans-Guido Wendel, Jerry Pelletier, Zhan Yao, and Neal Rosen. "Abstract B075: eIF4A regulates ERK activation by controlling the translation of DUSP6." In Abstracts: AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics; October 26-30, 2019; Boston, MA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1535-7163.targ-19-b075.

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Xia, Tian, Kin-Mang Lau, Chi Keung Cheng, Nelson CN Chan, and Margaret H. L. Ng. "Abstract 2498: Over-expression of dual-specificity phosphatase 4 (DUSP4) in multiple myeloma." In Proceedings: AACR Annual Meeting 2018; April 14-18, 2018; Chicago, IL. American Association for Cancer Research, 2018. http://dx.doi.org/10.1158/1538-7445.am2018-2498.

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Singh, Chandra K., Jasmine George, Minakshi Nihal, and Nihal Ahmad. "Abstract 3667: Potential role of DUSP4 as a tumor suppressor in pancreatic cancer." In Proceedings: AACR 107th Annual Meeting 2016; April 16-20, 2016; New Orleans, LA. American Association for Cancer Research, 2016. http://dx.doi.org/10.1158/1538-7445.am2016-3667.

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Boeckx, Carolien, Vanessa Deschoolmeester, An Wouters, Ken Op de Beeckx, Patrick Pauwels, Olivier Vanderveken, Guy van Camp, et al. "Abstract 5628: Overcoming cetuximab resistance in HNSCC: the role of AURKB and DUSP6." In Proceedings: AACR 104th Annual Meeting 2013; Apr 6-10, 2013; Washington, DC. American Association for Cancer Research, 2013. http://dx.doi.org/10.1158/1538-7445.am2013-5628.

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Haines, Zoe, Josh Cull, Samuel Baldwin, Guy Whitley, Angela Clerk, and Daniel Meijles. "BS23 mRNA expression profiling of dual specificity phosphatases (DUSPS) in the hypertensive heart." In British Cardiovascular Society Virtual Annual Conference, ‘Cardiology and the Environment’, 7–10 June 2021. BMJ Publishing Group Ltd and British Cardiovascular Society, 2021. http://dx.doi.org/10.1136/heartjnl-2021-bcs.221.

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Khadir, Abdelkrim, Ali Tiss, Jehad Abubaker, Mohamed Abu-farha, Irina Al Khairi, Preethi Cherian, Sina Kavalakatt, et al. "Map Kinase Phosphatase Dusp1 Is Overexpressed In Human Obese And Modulated By Physical Exercise." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.hbpp0059.

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