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Добірка наукової літератури з теми "Cox-2 expression"
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Дисертації з теми "Cox-2 expression"
1
Sun, Haipeng. "Regulation of Cyclooxygenase Gene Expression by Glucocorticoids in Cardiomyocytes." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194896.
Повний текст джерелаАнотація:
Glucocorticoids (GCs) are endogenous steroid hormones that regulate a number of critical physiological processes. Psychological stress increases the level of GCs in the circulating system. The biological effect of elevated GCs on the heart is not well understood. We found that GCs induced Cyclooxygenase-1 (COX-1) and COX-2 gene expression in cardiomyocytes. COX-1 or COX-2 encodes the rate-limiting enzyme in the biosynthesis of prostanoids, which modulate crucial physiological and pathophysiological responses. The present studies aim to elucidate the signaling transduction pathway and the mechanism underlying GC induced COX expression.Our data demonstrate that GCs activate COX-1 gene expression through transcriptional regulation. COX-1 gene promoter studies support a role of Sp binding site in CT induced COX-1 gene expression. The nuclear protein binding to this site appears to be Sp3 transcription factor. Co-immunoprecipitation assays indicated a physical interaction between GR and Sp3 protein. Silencing of Sp3 transcription factor with small interfering RNA suppressed CT-induced COX-1 promoter activation. These data suggest that the activated GR interacts with Sp3 transcription factor that binds to COX-1 promoter to up-regulate COX-1 gene expression in cardiomyocytes.We also found that administration of GC in adult mice increased the level of COX-2 in the ventricles. With isolated neonatal cardiomyocytes, corticosterone (CT) induces the transcription of COX-2 gene. This response appears to be cardiomyocyte cell type specific and GC receptor (GR)-dependent. CT causes activation of p38 MAPK and subsequently CREB phosphorylation that mediates COX-2 gene expression. Mifepristone, a GR antagonist, failed to inhibit p38 and CREB activation and p38 inhibition failed to prevent activation of GR. These data suggest that two parallel signaling pathways, GR and p38 MAPK, act in concert to regulate the expression of COX-2 gene in cardiomyocytes.In addition to the investigation of mechanism and signaling transduction pathway, I have explored pharmacological agents that modulate COX expression. LY294002, a commonly used PI3K inhibitor, inhibited COX-2 gene expression via a PI3K-independent mechanism. Whereas GSK-3 inhibitors, such as lithium chloride, upregulated COX-2 gene expression, but suppressed GC-induced COX-1 expression. These data have paved the foundation for pharmacological manipulation of COX-1 and COX-2 gene expression in the heart.
2
Fritzsche, Julia. "Expression von EGFR, HER-2 und COX-2 beim Zervixkarzinom: Vergleich von Primärtumoren und Rezidiven." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-119352.
Повний текст джерелаАнотація:
Ziel dieser Studie war es, die Häufigkeit der Expression von EGFR, HER-2 sowie COX-2 im Zervixkarzinom zu eruieren. Dabei galt es herauszufinden, ob Unterschiede hinsichtlich des Nachweises dieser drei, möglicherweise therapeutisch relevanten Moleküle zwischen den primären, nicht vortherapierten und operierten Karzinomen und den multimodal vorbehandelten Rezidiven gab. In der vorliegenden retrospektiven Arbeit wurden 45 TMMR-operierte Primärtumoren und 28 LEER-operierte Rezidivtumoren der Universitätsfrauenklinik Leipzig (Triersches Institut) einbezogen und zusätzlich hinsichtlich der prognostischen Überlebensanalyse durch das Tumorstadium, Lymphknotenmetastasen und Rezidivauftreten sowie histologischer Charakteristika untersucht. Dazu wurden Tissue - Microarrays angefertigt mit anschließender immunhistochemischer Untersuchung dieser.
Die Ergebnisse zeigten, dass die TMMR-Operation die Überlebensprognose signifikant verbessert, denn lediglich bei den LEER-therapierten Rezidivtumoren erlitten die Patientinnen sowohl Fernmetastasen als auch erneute Rezidive. Weder die Expression der drei untersuchten Moleküle noch die histopathologischen Parameter haben eine prognostische Relevanz. Es gibt keine signifikanten Zusammenhänge zwischen der Häufigkeit der Expression von EGFR, HER-2 sowie COX-2 und Primär-, bzw. Rezidivtumoren, sodass diese Moleküle keine Targets für eine individualisierte, zielgerichtete Therapie beim Zervixkarzinom darstellen.
3
Kim, Janet Heejung. "Cyclooxygenase-2 Expression in Post-Mastectomy Chest Wall Relapse." Yale University, 2006. http://ymtdl.med.yale.edu/theses/available/etd-06282006-104942/.
Повний текст джерелаАнотація:
The purpose of this study was to assess the prognostic significance and clinical correlations of cyclooxgenase-2 expression (COX) in a cohort of patients treated with radiation (RT) for post-mastectomy chest wall relapse (PMCWR). Between 1975 and 1999, 113 patients were treated for isolated PMCWR. All patients were treated with biopsy and/or excision of the CWR followed by RT. Median follow-up was 10 years. All clinical data including demographics, pathology, staging, receptor status, HER-2/neu status, and adjuvant therapy were entered into a computerized database. Paraffin-embedded CWR specimens were retrieved from 42 patients, of which 38 were evaluated, created into a tissue microarray, stained by immunohistochemical methods for COX, and graded 0-3+. A score of 2-3+ was considered positive. Overall survival from original diagnosis for the entire cohort was 44% at 10 years. Survival rate after chest wall recurrence was 28% at 10 years. The distant metastasis-free survival rate after CWR was 40% at 10 years. Local-regional control of disease was achieved in 79% at 10 years after CWR. COX was considered positive in 13 of 38 cases. COX was inversely correlated with ER (p= .045) and PR (p = .028), and positively correlated with HER-2/neu (p =.003). COX was also associated with a shorter time to PMCWR. The distant metastasis-free rate for COX negative patients was 70% at 10 years, compared with 31% at 10 years for COX-2 positive patients (p = 0.029). COX positive had a poorer local-regional progression-free rate of 19% at 10 years, compared with 81% at 10 years for COX negative (p = 0.003). Outcome following RT for PMCWR is relatively poor. Positive COX correlated with other markers of poor outcome including a shorter time to local relapse, negative ER/PR and positive Her-2/neu status. Positive COX correlated with higher distant metastasis and lower local-regional control of disease. If confirmed with larger studies, these data have implications with respect to the concurrent use of COX-2 inhibitors and radiation for PMCWR.
4
Kim, Youngsoo. "Molecular characterization of cyclooxygenase-2 (COX-2) expression in murine skin carcinoma cells /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерела
5
Rowe, Kherie Sheheda Janelle. "Cox-2 expression : interaction of Neisseria meningitidis with human cells." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519420.
Повний текст джерела
6
Abdalla, Salem Ishtiwi. "Cyclooxygenase-2 (cox-2) expression in Barrett's oesphageal epithelium : relationship to inflammation and cancer." Thesis, Queen Mary, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418127.
Повний текст джерела
7
Lysitsa, Stella. "Evolution du lichen plan buccal et expression de la COX-2 /." Genève : [s.n.], 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000253996.
Повний текст джерела
8
Huppes, Rafael Ricardo [UNESP]. "Expressão gênica de MMP-2 e 9, TIMP-1 e 2, ATM, TP53, VEGF, COX-2 e CDH-1 no TVT canino." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/122030.
Повний текст джерелаАнотація:
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000814346.pdf: 1337951 bytes, checksum: 9ed960afb83960e3296a726e4541f251 (MD5)<br>A literatura cita que 1 a 5% dos casos de tumor venéreo transmissível (TVT) primário são metastáticos. Sendo assim, é importante estudar os mecanismos que colaborem para a invasão metastática assim como para sua implantação. Dentre estes mecanismos as metaloproteinases (MMP-2 e MMP-9) e seus inibidores (TIMP-1 e TIMP-2), assim como o ATM, COX-2, VEGF e CDH-1 podem explicar a implantação tumoral no sítio primário e a ocorrência da invasão metastática do TVT no cão. O objetivo do presente trabalho é avaliar a expressão gênica dos marcadores acima e correlacionar a sua expressão com o poder de implantação e invasão metastática no TVT. Para este estudo foram avaliadas 32 amostras tumorais, que foram congeladas e delas extraídos RNAm. Utilizou-se o método de qRT-PCR para todos os transcritos. Os resultados foram comparados com sangue periférico de 10 cães saudáveis (grupo controle) com o teste de Mann Whitney. A expressão gênica de MMP-2 e TIMP-1 foi significativamente maior do que o grupo controle (p < 0,001; p = 0,037; respetivamente). A expressão dos transcritos dos genes MMP-9 e TIMP-2 não apresentou diferença estatística entre o TVT e grupo controle (p = 0,535; p = 0, 906; respetivamente). A avaliação de expressão de transcritos do ATMapresentou aumento significativo (p < 0,0001) de sua expressão no tecido tumoral (TVT) quando comparado com o grupo controle, enquanto a expressão dos transcritos do gene TP53 não apresentou diferença estatística entre os grupos (p = 0,26). Na avaliação da COX-2, VEGF, CDH-1 foi verificado aumento significativo (p < 0,0001; p < 0,0001; p = 0,04, respectivamente) da expressão de transcritos dos genes no tecido tumoral (TVT) em relação ao grupo controle. A super-expressão de MMP-2 e o TIMP-1 pode explicar a capacidade de implantação das células tumorais assim como a maior expressão de VEGF e COX-2 pode explicar o crescimento rápido local do tumor e ...<br>The literature reports that 1-5% of cases of primary trasmissible venereal tumor (TVT) are metastatic. Thus, it is interesting to study the mechanisms that collaborate to the metastatic invasion and implantation of TVT. Among these mechanisms, the metalloproetinases (MMP-2 and MMP-9) and their inhibitors (TIMP-1 and TIMP-2), as well as ATM, COX-2, VEGF and CDH-1 may explain the tumoral implantation in the primary site and metastatic invasion of TVT in dogs. The objectives of this study are to evaluate the gene expression of these markers and to correlate their expression with the high ability of deployment and metastatic invasion of TVT. For this study, 32 tumor samples were frozen and their mRNA were extract using the qRT-PCR method for all transcripts. The results were compared with peripheral blood of 10 healthy dogs (control group) using the Mann Whitney test. The expression of MMP-2 and TIMP-1 were significantly higher than the control group (p <0.001, p = 0.037, respectively). The expression of MMP-9 and TIMP-2 showed no statistical difference between the TVT and the control group (p = 0.535, p = 0, 906, respectively). The expression of ATM was increased in tumor tissue (TVT) when compared with the control group, while the expression of TP53 had no statistical difference between groups (p = 0.26). The evaluation of COX-2, VEGF and CDH-1 were increas in tumor tissue when compared with control group. The over expression of MMP-2 and TIMP-1 may explain the implantation ability of the tumor cells, as well as the increase of VEGF and COX-2 may explain the rapid tumor growth and the rich vasculatization. While the over expression of ATM, TP53 and CDH-1 may contribute to the low metastatic capacity of the TVT tumor
9
Huppes, Rafael Ricardo. "Expressão gênica de MMP-2 e 9, TIMP-1 e 2, ATM, TP53, VEGF, COX-2 e CDH-1 no TVT canino /." Jaboticabal, 2014. http://hdl.handle.net/11449/122030.
Повний текст джерелаАнотація:
Orientador: Renée Laufer Amorim<br>Coorientador: Andrigo Barboza De Nardi<br>Coorientador: Mirela Tinucci Costa<br>Banca: Rosemere de Oliveira Vasconcelos<br>Banca: Geórgia Mode Magalhães<br>Banca: Rafael Torres Neto<br>Banca: Bruno Watanabe Minto<br>Resumo: A literatura cita que 1 a 5% dos casos de tumor venéreo transmissível (TVT) primário são metastáticos. Sendo assim, é importante estudar os mecanismos que colaborem para a invasão metastática assim como para sua implantação. Dentre estes mecanismos as metaloproteinases (MMP-2 e MMP-9) e seus inibidores (TIMP-1 e TIMP-2), assim como o ATM, COX-2, VEGF e CDH-1 podem explicar a implantação tumoral no sítio primário e a ocorrência da invasão metastática do TVT no cão. O objetivo do presente trabalho é avaliar a expressão gênica dos marcadores acima e correlacionar a sua expressão com o poder de implantação e invasão metastática no TVT. Para este estudo foram avaliadas 32 amostras tumorais, que foram congeladas e delas extraídos RNAm. Utilizou-se o método de qRT-PCR para todos os transcritos. Os resultados foram comparados com sangue periférico de 10 cães saudáveis (grupo controle) com o teste de Mann Whitney. A expressão gênica de MMP-2 e TIMP-1 foi significativamente maior do que o grupo controle (p < 0,001; p = 0,037; respetivamente). A expressão dos transcritos dos genes MMP-9 e TIMP-2 não apresentou diferença estatística entre o TVT e grupo controle (p = 0,535; p = 0, 906; respetivamente). A avaliação de expressão de transcritos do ATMapresentou aumento significativo (p < 0,0001) de sua expressão no tecido tumoral (TVT) quando comparado com o grupo controle, enquanto a expressão dos transcritos do gene TP53 não apresentou diferença estatística entre os grupos (p = 0,26). Na avaliação da COX-2, VEGF, CDH-1 foi verificado aumento significativo (p < 0,0001; p < 0,0001; p = 0,04, respectivamente) da expressão de transcritos dos genes no tecido tumoral (TVT) em relação ao grupo controle. A super-expressão de MMP-2 e o TIMP-1 pode explicar a capacidade de implantação das células tumorais assim como a maior expressão de VEGF e COX-2 pode explicar o crescimento rápido local do tumor e ...<br>Abstract: The literature reports that 1-5% of cases of primary trasmissible venereal tumor (TVT) are metastatic. Thus, it is interesting to study the mechanisms that collaborate to the metastatic invasion and implantation of TVT. Among these mechanisms, the metalloproetinases (MMP-2 and MMP-9) and their inhibitors (TIMP-1 and TIMP-2), as well as ATM, COX-2, VEGF and CDH-1 may explain the tumoral implantation in the primary site and metastatic invasion of TVT in dogs. The objectives of this study are to evaluate the gene expression of these markers and to correlate their expression with the high ability of deployment and metastatic invasion of TVT. For this study, 32 tumor samples were frozen and their mRNA were extract using the qRT-PCR method for all transcripts. The results were compared with peripheral blood of 10 healthy dogs (control group) using the Mann Whitney test. The expression of MMP-2 and TIMP-1 were significantly higher than the control group (p <0.001, p = 0.037, respectively). The expression of MMP-9 and TIMP-2 showed no statistical difference between the TVT and the control group (p = 0.535, p = 0, 906, respectively). The expression of ATM was increased in tumor tissue (TVT) when compared with the control group, while the expression of TP53 had no statistical difference between groups (p = 0.26). The evaluation of COX-2, VEGF and CDH-1 were increas in tumor tissue when compared with control group. The over expression of MMP-2 and TIMP-1 may explain the implantation ability of the tumor cells, as well as the increase of VEGF and COX-2 may explain the rapid tumor growth and the rich vasculatization. While the over expression of ATM, TP53 and CDH-1 may contribute to the low metastatic capacity of the TVT tumor<br>Doutor
10
Laube, Markus. "Synthese von Cyclooxygenase-2-Inhibitoren als Grundlage für die funktionelle Charakterisierung der COX-2-Expression mittels PET." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-160091.
Повний текст джерелаАнотація:
Eine erhöhte COX-2-Expression wird bei Krankheiten wie rheumatoider Arthritis aber auch Parkinson, Alzheimer und Krebs beobachtet. Die nichtinvasive Visualisierung und Quantifizierung der COX 2-Expression in vivo mittels Positronen-Emissions-Tomographie (PET) könnte wertvolle Beiträge zur Diagnose dieser Krankheiten liefern. Zur Nutzung der PET-Technik werden geeignete COX-2-adressierende Radiotracer benötigt, deren Entwicklung auch die Identifizierung neuer, der Radiomarkierung zugänglicher COX-2-Inhibitoren als Leitstrukturen voraussetzt.
Ziel dieser Arbeit war die Synthese von selektiven, der Radiomarkierung zugänglichen COX 2-Inhibitoren und deren In-vitro-Evaluierung, um Verbindungen zu identifizieren, die für eine weitere Entwicklung zu COX-2-adressierenden Radiotracern geeignet sind. Im Rahmen dieser Arbeit wurden ausgehend von literaturbekannten COX-2-Inhibitoren zwei grundlegende Strategien verfolgt: die Derivatisierung an der Peripherie sowie der Austausch von Strukturelementen im Grundgerüst der COX-2-selektiven Inhibitoren.
In dieser Arbeit wird zum einen die Synthese der Zielverbindungen (Diphenyl-substituierte Indol-, Pyrazolo[1,5-b]pyridazin-, 1,2-Dihydropyrrolo[3,2,1-hi]indol- und Pyrrolo[3,2,1-hi]indol-Derivate sowie 2-Carbaboranyl-substituierte Indol-Derivate) und deren strukturanalytische Charakterisierung vorgestellt. Es konnte die McMurry-Cyclisierung als neuer Zugang für die Synthese von Carbaboranyl-substituierten Verbindungen und 1,2-Dihydropyrrolo[3,2,1-hi]indol-Derivaten sowie die Dehydrogenierung mittels DDQ als neue Variante zur Synthese von Pyrrolo[3,2,1-hi]indol-Derivaten etabliert werden. Durch Röntgeneinkristallstrukturanalyse wurde die Molekülstruktur von sechs Zwischenverbindungen und neun Zielverbindungen aufgeklärt.
Zum anderen erfolgte die Charakterisierung der Verbindungen in vitro, wobei die COX-inhibitorischen Eigenschaften mit einem Fluoreszenz-basierten, einem Enzymimmunoassay (EIA)-basierten und einem [14C]Arachidonsäure-basierten COX-Assay bestimmt und zudem viele Verbindungen hinsichtlich ihrer Redoxeigenschaften untersucht wurden. Im Besonderen die hergestellten Indol-Derivate besitzen antioxidative Eigenschaften, die bei der Untersuchung der COX inhibitorischen Eigenschaften beachtet werden müssen.
Die Derivatisierung an der Peripherie der bekannten Inhibitoren führte zur Identifizierung von zwei Aminosulfonyl-substituierten Indol-Derivaten und einem Fluorethoxy-substituierten Pyrazolo[1,5 b]pyridazin-Derivat, die grundsätzlich geeignete Kandidaten für eine weitere Entwicklung zum Radiotracer darstellen. Das Fluorethoxy-substituierte Pyrazolo[1,5 b]pyridazin-Derivat wurde im Rahmen dieser Arbeit mit Fluor-18 markiert und die initiale Charakterisierung des Radiotracers in vitro durchgeführt. Der Austausch von Strukturelementen im Grundgerüst der literaturbekannten COX-2-Inhibitoren mit voluminöseren Gruppen führte zum einen bei Austausch eines Phenylrings gegen einen Carbaboranyl-Cluster zum Verlust der COX-inhibitorischen Eigenschaften, was eine weitere Entwicklung dieser Verbindungen zum Radiotracer ausschließt. Zum anderen wurde ausgehend von 2,3-Diphenyl-1H-indol-Derivaten die bicyclische auf eine tricyclische Kernstruktur vergrößert. Dies lieferte hoch affine und selektive COX-2-Inhibitoren. Unter den hergestellten Verbindungen wurden ein 1,2-Dihydropyrrolo[3,2,1-hi]indol- und drei Pyrrolo[3,2,1-hi]indol-Derivate als vielversprechende Kandidaten für die weitere Entwicklung zum Radiotracer identifiziert.