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Journal articles on the topic 'Constricting rings'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Wu, Cheng-Lin, Ren-Qiao Wang, Jin-Ting Yang, et al. "Genomic and Transcriptomic Analyses Revealed DdSTE2 Play a Role in Constricting Ring Formation in the Nematode-Trapping Fungi Drechslerella dactyloides." Microorganisms 12, no. 11 (2024): 2190. http://dx.doi.org/10.3390/microorganisms12112190.

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The carnivorous fungus Drechslerella dactyloides can form constricting rings through hyphal specialization to capture nematodes. The formation of constricting rings is a prerequisite for capturing nematodes and a characteristic of entering the carnivorous stage. Currently, there is limited research on the molecular mechanism of constricting ring formation. In this study, two D. dactyloides mutants unable to form constricting rings were obtained through UV irradiation mutagenesis, and their growth and development phenotypes were compared with the wild-type strain. Transcriptome comparisons reve

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2

Udapudi, Deepak G., Siddharth Vijay Kalke, and Madhavi Nayak. "Bottle neck around penile neck-3 rare case reports." International Surgery Journal 5, no. 5 (2018): 1949. http://dx.doi.org/10.18203/2349-2902.isj20181616.

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A variety of metallic and non-metallic rings causing constriction to the external genitalia have been described in the literature across all ages. The adult population frequently reports erotic or autoerotic goals when intentionally placing constricting devices. In adults these constricting bands are placed deliberately by the person himself to influence blood circulation and thereby obtain prolonged erection and/or sexual pleasure. A compilation of 3 rare case presentations in the casualty of JJM Medical College Davangere were collected and studied. The present case series shows that sexual p

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3

Silva, Ana M., Daniel S. Osório, Antonio J. Pereira, et al. "Robust gap repair in the contractile ring ensures timely completion of cytokinesis." Journal of Cell Biology 215, no. 6 (2016): 789–99. http://dx.doi.org/10.1083/jcb.201605080.

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Cytokinesis in animal cells requires the constriction of an actomyosin contractile ring, whose architecture and mechanism remain poorly understood. We use laser microsurgery to explore the biophysical properties of constricting rings in Caenorhabditis elegans embryos. Laser cutting causes rings to snap open. However, instead of disintegrating, ring topology recovers and constriction proceeds. In response to severing, a finite gap forms and is repaired by recruitment of new material in an actin polymerization–dependent manner. An open ring is able to constrict, and rings repair from successive

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4

PISOH, T., A. BHATIA, and C. OBERLIN. "Surgical Correction of Pseudo-Ainhum in Vohwinkel Syndrome." Journal of Hand Surgery 20, no. 3 (1995): 338–41. http://dx.doi.org/10.1016/s0266-7681(05)80090-7.

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Vohwinkel syndrome or hereditary mutilating keratodermatitis is a rare condition producing palmo-plantar hyperkeratosis and constricting rings of the fingers and toes which can progress to compromise neurovascular function and mobility. Medical treatment with oral retinol derivatives is recommended when its use is not contra-indicated. This paper describes surgical correction of the constricting rings on both hands in a 33-year-old woman affected by this condition.

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5

Wang, Shuyuan, and Ben O’Shaughnessy. "Anchoring of actin to the plasma membrane enables tension production in the fission yeast cytokinetic ring." Molecular Biology of the Cell 30, no. 16 (2019): 2053–64. http://dx.doi.org/10.1091/mbc.e19-03-0173.

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The cytokinetic ring generates tensile force that drives cell division, but how tension emerges from the relatively disordered ring organization remains unclear. Long ago, a musclelike sliding filament mechanism was proposed, but evidence for sarcomeric order is lacking. Here we present quantitative evidence that in fission yeast, ring tension originates from barbed-end anchoring of actin filaments to the plasma membrane, providing resistance to myosin forces that enables filaments to develop tension. The role of anchoring was highlighted by experiments on isolated fission yeast rings, where s

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6

Promny, Dominik, Raymund E. Horch, and Theresa Promny. "Keystone Flap in Amniotic Band Syndrome—Innovative Approach of an Established Operative Technique for an Unusual Entity." Surgical Techniques Development 12, no. 4 (2023): 164–75. http://dx.doi.org/10.3390/std12040016.

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Amniotic Band Syndrome (ABS) is a complex condition characterized by constricting rings and tissue synechiae, resulting in tissue necrosis and congenital anomalies. In newborns and infants with ABS, tissue necrosis can be profound, requiring a tissue defect reconstruction, realized by a Keystone Perforator Island Flap (KF). Primarily used for reconstruction after skin cancer excisions, KF’s applications expanded to defects of various etiologies and disorders throughout the body. Subsequently, additional KF types adapted to the particular tissue defects were developed. The KF’s preparation is r

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7

Tan, Virak. "Coban Method for Removing a Constricting Ring." HAND 14, no. 1 (2018): 133–34. http://dx.doi.org/10.1177/1558944718798855.

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Background: Various techniques have been described for removal of a tight constricting ring from a finger. A novel procedure is described in this article. Methods: The method is a modification of the string wrap or winding technique. A 1-inch Coban wrap, lubricant, and pickups are all that is required. Results: The author has used this method to remove constricting rings from swollen and arthritic fingers in 5 patients. The technique has been successful in all cases, and no complications occurred. Conclusions: The Coban method is a quick, easy, and inexpensive technique for ring removal from a

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8

Glockling, S. L., and M. W. Dick. "Dactylella megalobrocha, a new species of nematophagous fungus with constricting rings." Mycological Research 98, no. 8 (1994): 845–53. http://dx.doi.org/10.1016/s0953-7562(09)80252-9.

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9

Liu, Keke, Jianqing Tian, Meichun Xiang, and Xingzhong Liu. "How carnivorous fungi use three-celled constricting rings to trap nematodes." Protein & Cell 3, no. 5 (2012): 325–28. http://dx.doi.org/10.1007/s13238-012-2031-8.

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10

Skalak, Matthew, Rami Jirjis, Barrett G. Anderson, and Brandi D. Miller. "Robot-Assisted Repair of Bladder Rupture following Penile Ring Entrapment." Case Reports in Urology 2023 (September 7, 2023): 1–4. http://dx.doi.org/10.1155/2023/5523569.

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Penile rings have been used to help sustain erection and enhance sexual pleasure for centuries. Constriction of the penis reduces the outflow of blood from the cavernosal tissue. However, if left for an extended time period, a condition called penile ring entrapment can occur. This may result in severe edema, gangrene, necrosis, and even penile amputation. Penile ring entrapment is a very rare condition; complete urinary obstruction with concomitant bladder rupture as a result renders this case even more extraordinary. We discuss our experience in the management of a 64-year-old man, who prese

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11

Zhang, Ying, Min Qiao, H. O. Baral, Jianping Xu, Ke-Qin Zhang, and Ze-Fen Yu. "Morphological and molecular characterization of Orbilia pseudopolybrocha and O. tonghaiensis, two new species of Orbiliaceae from China." International Journal of Systematic and Evolutionary Microbiology 70, no. 4 (2020): 2664–76. http://dx.doi.org/10.1099/ijsem.0.004088.

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This study examined over 20 fungal specimens of the Orbiliaceae (Orbiliomycetes) from different regions in China. Our analyses based on morphological traits and the ITS rDNA sequences revealed two new Orbilia species with drechslerella-like asexual morphs. These new species are able to trap nematodes with constricting rings. In addition, Orbilia cf. orientalis is reported as a new cryptic Chinese variant of European collections of O. orientalis. All three species are described and illustrated in detail in this paper. Their phylogenetic relationships with other orbiliaceous species were identif

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12

Kawai, Yoshikazu, and Naotake Ogasawara. "Bacillus subtilis EzrA and FtsL synergistically regulate FtsZ ring dynamics during cell division." Microbiology 152, no. 4 (2006): 1129–41. http://dx.doi.org/10.1099/mic.0.28497-0.

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Previous work has shown that the Bacillus subtilis EzrA protein directly inhibits FtsZ ring assembly, which is required for normal cell division, and that loss of EzrA results in hyperstabilization of the FtsZ polymer in vivo. Here, it was found that in ezrA-disrupted cells, artificial expression of YneA, which suppresses cell division during the SOS response, and disruption of noc (yyaA), which acts as an effector of nucleoid occlusion, resulted in accumulation of multiple non-constricting FtsZ rings, inhibition of cell division, and synthetic lethality. Overexpression of the essential cell d

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13

Kähönen, Mika, Jari-Petteri Tolvanen, Kirsimarja Sallinen, Xiumin Wu, and Ilkka Pörsti. "Influence of gender on control of arterial tone in experimental hypertension." American Journal of Physiology-Heart and Circulatory Physiology 275, no. 1 (1998): H15—H22. http://dx.doi.org/10.1152/ajpheart.1998.275.1.h15.

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Endothelial dysfunction has been found to be less severe in female than in male spontaneously hypertensive rats (SHR), which could contribute to the gender differences observed in the extent and rate of progression of hypertension in SHR. However, the influence of gender on the roles of different endothelium-derived mediators in the arterial responses in hypertension have not been evaluated in detail. Therefore, contractile and relaxation responses of mesenteric arterial rings in vitro were studied in female and male SHR, with normotensive female and male Wistar-Kyoto rats (WKY) serving as con

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14

Vyas, Kunj N., and Mehul I. Solanki. "Penile strangulation by a metal ring: an easy and unique thread method for removal of the ring." International Surgery Journal 6, no. 2 (2019): 623. http://dx.doi.org/10.18203/2349-2902.isj20190418.

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Penile incarceration is a rare but serious problem. Rapid treatment is necessary to prevent penile infarction. Glass bottles, metal rings, steel nuts and bull rings have been reported as constricting agents. Depending on the type of material, various tools such as diamond drills, bolt cutters and glass saws have been used to remove the objects. Penile strangulation by metal ring is a rare surgical emergency situation which requires urgent intervention to avoid vascular and urethral injury. It is usually associated with an attempt to improve sexual act and/or to prolong erection, psychosexual d

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15

Tebbs, Irene R., and Thomas D. Pollard. "Separate roles of IQGAP Rng2p in forming and constricting the Schizosaccharomyces pombe cytokinetic contractile ring." Molecular Biology of the Cell 24, no. 12 (2013): 1904–17. http://dx.doi.org/10.1091/mbc.e12-10-0775.

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Eukaryotic cells require IQGAP family multidomain adapter proteins for cytokinesis, but many questions remain about how IQGAPs contribute to the process. Here we show that fission yeast IQGAP Rng2p is required for both the normal process of contractile ring formation from precursor nodes and an alternative mechanism by which rings form from strands of actin filaments. Our work adds to previous studies suggesting a role for Rng2p in node and ring formation. We demonstrate that Rng2p is also required for normal ring constriction and septum formation. Systematic analysis of domain-deletion mutant

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16

Liu, Keke, Weiwei Zhang, Yiling Lai, et al. "Drechslerella stenobrocha genome illustrates the mechanism of constricting rings and the origin of nematode predation in fungi." BMC Genomics 15, no. 1 (2014): 114. http://dx.doi.org/10.1186/1471-2164-15-114.

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17

Fang, Meiling, Shaojuan Wang, Jianping Xu, et al. "Characterization of the complete mitochondrial genome of Drechslerella brochopaga, a fungal species trapping nematodes with constricting rings." Mitochondrial DNA Part B 4, no. 1 (2019): 858–59. http://dx.doi.org/10.1080/23802359.2019.1572466.

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18

SINHA, M., and S. B. WATSON. "Keratoderma Hereditarium Mutilans (Vohwinkel Syndrome)." Journal of Hand Surgery (European Volume) 34, no. 2 (2009): 235–37. http://dx.doi.org/10.1177/1753193408098901.

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Keratoderma hereditarium mutilans, or Vohwinkel syndrome, is a very rare genetic skin condition which causes palmoplantar hyperkeratosis and constricting rings of the fingers and toes. Approximately 50 cases have been reported in the literature with only three having been managed surgically. All three had a high rate of recurrence and unfavourable results in the long term. We report two more cases managed surgically with a follow up of 5 and 8 years respectively. Our experience suggests that the use of full thickness grafts to line the released contractures does not work in the long term as th

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19

Zhang, Fa, Yao-Quan Yang, Fa-Ping Zhou, Wen Xiao, Saranyaphat Boonmee, and Xiao-Yan Yang. "Morphological and Phylogenetic Characterization of Five Novel Nematode-Trapping Fungi (Orbiliomycetes) from Yunnan, China." Journal of Fungi 9, no. 7 (2023): 735. http://dx.doi.org/10.3390/jof9070735.

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Nematode-trapping fungi are widely studied due to their unique morphological structure, survival strategy, and potential value in the biological control of harmful nematodes. During the identification of carnivorous fungi preserved in our laboratory, five novel nematode-trapping fungi were established and placed in the genera Arthrobotrys and Drehslerella based on morphological and multigene (ITS, TEF, and RPB2) phylogenetic analyses. A. hengjiangensis sp. nov. and A. weixiensis sp. nov. are characterized by producing adhesive networks to catch nematodes. Dr. pengdangensis sp. nov., Dr. tianch

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20

Nik Ahmad Shaiffudin, Nik Him, Nik Arif Nik Mohamad, Azizul Fadzli Jusoh, Rosliza Yahaya, Ismawati, and Mohd Adib Aiman Rashid. "The Beautiful Mind : A Case Report." Malaysian Journal of Applied Sciences 7, no. 1 (2022): 79–83. http://dx.doi.org/10.37231/myjas.2022.7.1.328.

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Caring for a family member diagnosed with schizophrenia will not only impart a lifetime of emotional distress but also social and financial challenges. Failure to anticipate and cope with the burden of care responsibilities will add unnecessary risk to permanent injury resulting in substandard management of the patient and even death. We describe a case of successful removal of nine (9) constricting rings from the finger of both hands in a poorly taken care of an abusive relapse schizophrenia patient using an oscillating saw and ring cutter under procedural sedation combined with wrist block i

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21

Kusum, Meena, Singla Sujata, and Kumar Pawan. "Dangerous Site to Wear a Metallic Ring: A Case Report and Review of Literature of Penile Strangulation." International Journal of Medical Reviews and Case Reports 3, no. 7 (2018): 417–19. https://doi.org/10.5455/IJMRCR.penile-strangulation.

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BACKGROUND: Penile incarceration injury patients pose a real challenge for general surgeons in emergency setup. Penile incarceration with encircling devices is an unusual condition and consequences can be severe. We are reporting a case of 50 year old male patient who presented to hospital ten days after putting a heavy metallic ring at root of penis. The placement of such rings can lead to minor to severe trauma to genital organs. CASE SUMMARY: We are reporting a case of married elderly gentleman who himself wore a metallic ring at root of penis for sexual erotism and landed with constricting

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22

Zhao, Xiaozhou, Yani Fan, Meichun Xiang, Seogchan Kang, Shunxian Wang, and Xingzhong Liu. "DdaCrz1, a C2H2-Type Transcription Factor, Regulates Growth, Conidiation, and Stress Resistance in the Nematode-Trapping Fungus Drechslerella dactyloides." Journal of Fungi 8, no. 7 (2022): 750. http://dx.doi.org/10.3390/jof8070750.

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The Ca2+/calmodulin-dependent signaling pathway regulates diverse cellular processes. Calcineurin is a calcium-dependent phosphatase acting in fungi mainly through Crz1, a zinc finger transcription factor. Although the likely involvement of Ca2+ in fungal carnivorism has been documented, how Crz1 functions in nematode-trapping fungi remains unknown. Here, we identified the Crz1 gene (named as DdaCrz1) in Drechslerella dactyloides, a species that forms constricting rings to trap nematodes. The deletion of DdaCrz1 significantly reduced hyphal growth and conidiation, trap formation, and ring cell

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23

Abhijith, H. M., M. M. Hussain, Mohd Shafiuddin, and Vitthal Prasad Haribhat. "Strangulation Induced Penile Gangrene in a Mentally Challenged Person." Karnataka Journal of Surgery 2 (February 14, 2025): 37–39. https://doi.org/10.25259/kjs_16_2024.

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Penile gangrene is a rare entity, seen most commonly in patients using rings at the root of the penis for erection and rarely with ischaemia from various causes like self-harm, accidents, or assaults. Penoscrotal constriction devices, utilised for sexual enhancement, employ diverse materials. Conversely, penile strangulation, a rare urological emergency, requires swift intervention to prevent severe complications like necrosis. Treatment often demands an early intervention. A mentally challenged 25-year-old boy presented with suspected penile gangrene. Examination revealed multiple rubber band

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24

Zhao, Xiaozhou, Yani Fan, Liao Zhang, et al. "Multiple Roles of the Low-Affinity Calcium Uptake System in Drechslerella dactyloides, a Nematode-Trapping Fungus That Forms Constricting Rings." Journal of Fungi 9, no. 10 (2023): 975. http://dx.doi.org/10.3390/jof9100975.

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(1) Background: the low-affinity calcium uptake system (LACS) has been shown to play a crucial role in the conidiation and formation of adhesive nets and knobs by nematode-trapping fungi (NTF), but its involvement in the formation of constricting rings (CRs), mechanical traps to capture free-living nematodes, remains unexplored. (2) Methods: we investigated the function of two LACS genes (DdaFIG_1 and DdaFIG_2) in Drechslerella dactyloides, an NTF that forms CRs. We generated single (DdaFIG_1Ri and DdaFIG_2Ri) and double (DdaFIG_1,2Ri) knockdown mutants via the use of RNA interference (RNAi).

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25

Brill, J. A., G. R. Hime, M. Scharer-Schuksz, and M. T. Fuller. "A phospholipid kinase regulates actin organization and intercellular bridge formation during germline cytokinesis." Development 127, no. 17 (2000): 3855–64. http://dx.doi.org/10.1242/dev.127.17.3855.

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The endgame of cytokinesis can follow one of two pathways depending on developmental context: resolution into separate cells or formation of a stable intercellular bridge. Here we show that the four wheel drive (fwd) gene of Drosophila melanogaster is required for intercellular bridge formation during cytokinesis in male meiosis. In fwd mutant males, contractile rings form and constrict in dividing spermatocytes, but cleavage furrows are unstable and daughter cells fuse together, producing multinucleate spermatids. fwd is shown to encode a phosphatidylinositol 4-kinase (PI 4-kinase), a member

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26

Johnson, Lynelle R., John R. Dodam, and M. Harold Laughlin. "Endothelium-dependent relaxation differs in porcine pulmonary arteries from the left and right caudal lobes." Journal of Applied Physiology 88, no. 3 (2000): 827–34. http://dx.doi.org/10.1152/jappl.2000.88.3.827.

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We hypothesized that pulmonary arteries (PA) from identical branch orders within left and right caudal lung lobes would exhibit similar vasomotor responses. Arterial rings from caudal lung lobes of female swine were examined in vitro. Vascular smooth muscle contraction to KCl and norepinephrine did not differ. Vascular relaxation to endothelium-dependent (bradykinin, acetylcholine, A-23187) and -independent (sodium nitroprusside, zero-calcium Krebs solution) vasodilators was assessed. Right PA exhibited less maximal relaxation to acetylcholine (50%) than did left PA (69%; P< 0.001). Maximal

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27

Jaffee, B. A. "Correlations Between Most Probable Number and Activity of Nematode-Trapping Fungi." Phytopathology® 93, no. 12 (2003): 1599–605. http://dx.doi.org/10.1094/phyto.2003.93.12.1599.

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Soil cages were used to determine whether nematode-trapping fungi population density, as measured by most probable number (MPN) procedures, was correlated with the trapping of nematodes. Fungi studied (and trap type) were Arthrobotrys oligospora (adhesive networks), A. eudermata (adhesive networks), A. dactyloides (constricting rings), Dactylellina ellipsospora (adhesive knobs), and D. haptotyla (adhesive knobs). The fungi were formulated as assimilative hyphae in dried alginate pellets. Pellets were added to field soil, the soil was packed into 80-cm3 cages (PVC pipe, 3.0 cm long and 3.9 cm i

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28

Zhang, Fa, Saranyaphat Boonmee, Jutamart Monkai, Xiao-Yan Yang, and Wen Xiao. "Drechslerella daliensis and D. xiaguanensis (Orbiliales, Orbiliaceae), two new nematode-trapping fungi from Yunnan, China." Biodiversity Data Journal 10 (December 16, 2022): e96642. https://doi.org/10.3897/BDJ.10.e96642.

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Nematode-trapping fungi are a highly specialised group in fungi and are essential regulators of natural nematode populations. At present, more than 130 species have been discovered in Zygomycota (Zoopagaceae), Basidiomycota (<i>Nematoctonus</i>), and Ascomycota (Orbiliaceae). Amongst them, nematode-trapping fungi in Orbiliaceae have become the research focus of carnivorous fungi due to their abundant species. During the investigation of carnivorous fungi in Yunnan, China, four fungal strains isolated from burned forest soil were identified as two new nematode-trapping species in <i>Drechslerel

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29

Cracowski, Jean-Luc, Françoise Stanke-Labesque, Carmine Sessa, et al. "Functional comparison of the human isolated femoral artery, internal mammary artery, gastroepiploic artery, and saphenous vein." Canadian Journal of Physiology and Pharmacology 77, no. 10 (1999): 770–76. http://dx.doi.org/10.1139/y99-063.

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Human femoral, internal mammary, and gastroepiploic arteries and saphenous veins are used as bypass grafts for coronary surgery or for reconstruction in arterial occlusive disease. We have characterized the contractile responses of these vessels to various agents that are liberated during cardiac or vascular surgery. In organ baths, U46619 (a stable thromboxane A2 mimetic), norepinephrine, endothelin-1, angiotensin II, and KCl caused concentration-dependent contractions in all vessels tested. Leukotriene C4 did not induce any contraction in the arteries, whereas a contraction was obtained in t

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30

Wright, P., Y. Ishihara, and G. R. Bernard. "Effects of nitroprusside on lung mechanics and hemodynamics after endotoxemia in awake sheep." Journal of Applied Physiology 64, no. 5 (1988): 2026–32. http://dx.doi.org/10.1152/jappl.1988.64.5.2026.

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We examined the effects of intravenous sodium nitroprusside (NP) infusion on pulmonary arterial pressure (Ppa), pulmonary vascular resistance (PVR), dynamic compliance (Cdyn), resistance to airflow across the lungs (RL), and alveolar-arterial O2 pressure gradient (PAO2-PaO2) (room air) after endotoxemia in awake sheep. NP infused 2.5 h after endotoxin administration immediately reduced mean Ppa from 30 +/- 3 to 17 +/- 3 (SE) cmH2O, PVR from 6.3 +/- 0.7 to 4.8 +/- 0.5 cmH2O.l-1.min, and RL from 340 +/- 48 of base line to 205 +/- 73% and increased Cdyn from 54 +/- 5 of base line to 80 +/- 14% wi

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31

Islami, Hilmi, Sadi Bexheti, Ragip Shabani, et al. "Role of Meconium in the Reaction of Airways Smooth Musculature in the Newborn with Meconium Aspiration Syndrome (Mas)." Bosnian Journal of Basic Medical Sciences 9, no. 4 (2009): 342–248. http://dx.doi.org/10.17305/bjbms.2009.2791.

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The role of meconium in the respiratory system was studied in newborns, who died from various causes (250 up to 3000 g of weight). We monitored tracheal rings response to dopamine, serotonin and ethanol in different concentrations (dopamine: 0,05 mg/ml, 0,5 mg/ml, 5 mg/ml; serotonin (5-HT): 10-4, 10-3, 10-2, 10-1 mol/dm3; ethanol: 0,02 ml, 0,5 ml, 1,0 ml; 96%). Tracheal smooth musculature tonus (TSM) was examined in 48 tracheal preparations taken after the newborn exitus due to different reasons. Based on functional researche of isolated preparations of tracheas, it may be concluded that: aspi

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32

Kähönen, Mika, Kirsi Karjala, Nina Hutri-Kähönen, et al. "Influence of chronic ethanol consumption on arterial tone in young and aged rats." American Journal of Physiology-Heart and Circulatory Physiology 276, no. 2 (1999): H464—H471. http://dx.doi.org/10.1152/ajpheart.1999.276.2.h464.

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The aim of this work was to evaluate the effects of long-term ethanol consumption on arterial responses in vitro in young and aged rats. Therefore, Wistar rats (ages 3 and 29 mo, respectively) were allocated to six groups: control-young, sucrose-young, ethanol-young, control-aged, sucrose-aged, and ethanol-aged. The ethanol-fed groups were given 25% ethanol by intragastric gavage three times a day 4 days a week. Responses of mesenteric arterial rings were examined in standard organ chambers after 5 treatment weeks. In norepinephrine-precontracted arterial rings, endothelium-dependent relaxatio

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Singh, Vinaya A., Navina V. Desai, Sushma Malik, Poonam Wade, and Prachi Gandhi. "Amniotic band syndrome: a case series." International Journal of Contemporary Pediatrics 7, no. 5 (2020): 1145. http://dx.doi.org/10.18203/2349-3291.ijcp20201641.

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Amniotic band syndrome (ABS) is a rare congenital disorder which involves fetal entrapment in strands of amniotic tissue, which can manifest as constriction rings, limb and digital amputations or complex congenital anomalies and sometimes results in stillbirth. Etiopathogenesis is varied and ABS can be associated with syndromes. Antenatal diagnosis is made by ultrasonography in most cases. Postnatal examination reveals constrictions, amputations and craniofacial or abdominal wall defects. Treatment is case based and surgical intervention is required to release constriction rings. Authors repor

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Snead, Wilton T., Carl C. Hayden, Avinash K. Gadok, et al. "Membrane fission by protein crowding." Proceedings of the National Academy of Sciences 114, no. 16 (2017): E3258—E3267. http://dx.doi.org/10.1073/pnas.1616199114.

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Membrane fission, which facilitates compartmentalization of biological processes into discrete, membrane-bound volumes, is essential for cellular life. Proteins with specific structural features including constricting rings, helical scaffolds, and hydrophobic membrane insertions are thought to be the primary drivers of fission. In contrast, here we report a mechanism of fission that is independent of protein structure—steric pressure among membrane-bound proteins. In particular, random collisions among crowded proteins generate substantial pressure, which if unbalanced on the opposite membrane

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35

Zschauer, A. O. A., M. W. Sielczak, and A. Wanner. "Altered contractile sensitivity of isolated bronchial artery to phenylephrine in ovalbumin-sensitized rabbits." Journal of Applied Physiology 86, no. 5 (1999): 1721–27. http://dx.doi.org/10.1152/jappl.1999.86.5.1721.

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We tested the hypothesis that atopy and/or allergic lung inflammation enhances α1-adrenoceptor-mediated contractions of the bronchial artery. Bronchial arterial resistance vessels were isolated from rabbits that had undergone either systemic ovalbumin (OVA) sensitization followed by saline aerosol challenge (OVA/saline rabbits), or OVA sensitization followed by OVA aerosol challenge (OVA/OVA rabbits), or no sensitization followed by saline aerosol challenge (control rabbits). In OVA/OVA rabbits, bronchoalveolar lavage and lung histology revealed lymphocytic and eosinophilic inflammation. Arter

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Kawanabe, Yoshifumi, Tomoh Masaki, and Nobuo Hashimoto. "Effects of the Ca++-permeable nonselective cation channel blocker LOE 908 on subarachnoid hemorrhage—induced vasospasm in the basilar artery in rabbits." Journal of Neurosurgery 98, no. 3 (2003): 561–64. http://dx.doi.org/10.3171/jns.2003.98.3.0561.

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Object. The Ca++ influx into vascular smooth-muscle cells (VSMCs) plays a fundamental role in the development and chronic effects of vasospasm after subarachnoid hemorrhage (SAH). The Ca++-permeable nonselective cation channels (NSCCs) are activated by several endothelium-derived constricting factors such as endothelin 1 (ET-1) and thromboxane A2. Moreover, the receptor-operated Ca++ channel blocker LOE 908 inhibits ET-1—induced extracellular Ca++ influx via NSCCs in the VSMCs of the basilar artery (BA) and the NSCC-dependent part of ET-1—induced vasoconstriction of BA rings. The purpose of th

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Stadnicka, Anna, Thomas A. Stekiel, Quinn H. Hogan, Zeljko J. Bosnjak, and John P. Kampine. "Hypoxic Contraction of Isolated Rabbit Mesenteric Veins." Anesthesiology 82, no. 2 (1995): 550–58. http://dx.doi.org/10.1097/00000542-199502000-00025.

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Background Acute systemic hypoxia induces mesenteric venoconstriction in intact rabbits in part because of an increase in chemoreflex-mediated sympathetic efferent nerve activity. Inhaled anesthetics attenuate this reflex response. The direct effects of hypoxia on mesenteric veins are unknown. The purpose of the current study was to examine the effects of hypoxia on isolated rabbit mesenteric capacitance veins and to determine the effects of halothane, isoflurane, and enflurane on the responses to hypoxia. Methods Isometric tension was measured before, during, and after 10 min of hypoxia in th

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Petrak, Margaret L., and Robert Clipsham. "Comments on Constrictive Rings." Journal of the Association of Avian Veterinarians 3, no. 2 (1989): 72. http://dx.doi.org/10.2307/30134908.

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Upton, Joseph, and Cissy Tan. "Correction of constriction rings." Journal of Hand Surgery 16, no. 5 (1991): 947–53. http://dx.doi.org/10.1016/s0363-5023(10)80166-2.

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Kriska, Tamas, Anja Herrnreiter, Sandra L. Pfister, Adeniyi Adebesin, John R. Falck, and William B. Campbell. "Macrophage 12(S)-HETE Enhances Angiotensin II–Induced Contraction by a BLT2 (Leukotriene B ₄ Type-2 Receptor) and TP (Thromboxane Receptor)-Mediated Mechanism in Murine Arteries." Hypertension 79, no. 1 (2022): 104–14. http://dx.doi.org/10.1161/hypertensionaha.121.17824.

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12/15-LO (12/15-lipoxygenase), encoded by Alox15 gene, metabolizes arachidonic acid to 12(S)-HETE (12-hydroxyeicosatetraenoic acid). Macrophages are the major source of 12/15-LO among immune cells, and 12/15-LO plays a crucial role in development of hypertension. Global Alox15 - or macrophage-deficient mice are resistant to Ang II (angiotensin II)–induced hypertension. This study tests the hypothesis that macrophage 12(S)-HETE contributes to Ang II–mediated arterial constriction and thus to development of Ang II–induced hypertension. Ang II constricted isolated abdominal aortic and mesenteric

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Wilson, Judy R., and Jeremiah Campbell. "Hyperbaric Oxygen Attenuates Aortic Vasoconstriction after Simulated Microgravity in Rats." Sports and Exercise Medicine – Open Journal 7, no. 1 (2021): 6–11. http://dx.doi.org/10.17140/semoj-7-183.

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Background The hindlimb suspended (HLS) rat model has been used in land-based research to evaluate effects of simulated microgravity. Previous research demonstrated that 2-4 weeks of HLS reduced vasoconstrictive responses of aortic, mesenteric, and femoral arterial rings to phenylephrine (PHE) while acute exposure to hyperoxia amplified constrictive responses to PHE. The purpose of this study was to determine if hyperbaric oxygen treatment (HBO) during HLS would reverse the attenuation of the vasoconstrictive response. Methods Five-month-old male Sprague Dawley rats were randomly divided into

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Nelson, S. H., O. S. Steinsland, R. L. Johnson, M. S. Suresh, A. Gifford, and J. S. Ehardt. "Pregnancy-induced alterations of neurogenic constriction and dilation of human uterine artery." American Journal of Physiology-Heart and Circulatory Physiology 268, no. 4 (1995): H1694—H1701. http://dx.doi.org/10.1152/ajpheart.1995.268.4.h1694.

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The responses to electrical field stimulation (EFS) of perivascular nerves in human uterine arteries were characterized. The arteries were removed from pregnant and nonpregnant patients undergoing hysterectomy. Tetrodotoxin, guanethidine, and phentolamine blocked EFS (2 min, 80 V, 0.1-ms duration)-induced constriction. The constrictions and the endogenous norepinephrine levels were lower (P < 0.01) in uterine arteries from pregnant than from nonpregnant patients. When arterial rings were precontracted, the response to EFS was biphasic, consisting of an initial constriction followed by a pos

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Calvert, Meredith E. K., Graham D. Wright, Fong Yew Leong, et al. "Myosin concentration underlies cell size–dependent scalability of actomyosin ring constriction." Journal of Cell Biology 195, no. 5 (2011): 799–813. http://dx.doi.org/10.1083/jcb.201101055.

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In eukaryotes, cytokinesis is accomplished by an actomyosin-based contractile ring. Although in Caenorhabditis elegans embryos larger cells divide at a faster rate than smaller cells, it remains unknown whether a similar mode of scalability operates in other cells. We investigated cytokinesis in the filamentous fungus Neurospora crassa, which exhibits a wide range of hyphal circumferences. We found that N. crassa cells divide using an actomyosin ring and larger rings constricted faster than smaller rings. However, unlike in C. elegans, the total amount of myosin remained constant throughout co

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Cappelli-Bigazzi, M., K. G. Lamping, D. W. Nuno, and D. G. Harrison. "Leukocyte and platelet-derived factors augment canine coronary constriction to serotonin." American Journal of Physiology-Heart and Circulatory Physiology 259, no. 4 (1990): H1161—H1170. http://dx.doi.org/10.1152/ajpheart.1990.259.4.h1161.

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In open-chest anesthetized dogs acute hypertension causes neutrophil and platelet adhesion to vascular endothelium and selectively potentiates constriction to serotonin in proximal coronary arteries. To examine underlying mechanisms, canine left anterior descending coronary arteries subjected to 15 min hypertension (LAD-HYP) and control left circumflex coronary arteries (CX) perfused at normal pressure were studied in organ chambers. In endothelium-intact LAD-HYP rings, constriction to serotonin was potentiated fourfold compared with control CX rings but was similar in denuded LAD-HYP and CX v

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Xue, Zenghui, and Anna Marie Sokac. "Back-to-back mechanisms drive actomyosin ring closure during Drosophila embryo cleavage." Journal of Cell Biology 215, no. 3 (2016): 335–44. http://dx.doi.org/10.1083/jcb.201608025.

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Contraction of actomyosin rings during cytokinesis is typically attributed to actin filaments sliding toward each other via Myosin-2 motor activity. However, rings constrict in some cells in the absence of Myosin-2 activity. Thus, ring closure uses Myosin-2–dependent and –independent mechanisms. But what the Myosin-2–independent mechanisms are, and to what extent they are sufficient to drive closure, remains unclear. During cleavage in Drosophila melanogaster embryos, actomyosin rings constrict in two sequential and mechanistically distinct phases. We show that these phases differ in constrict

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Dr. Anoop Kumar Singh, Dr Anoop Kumar Singh, Dr Anumita Sinha, and Dr Archika Dr. Archika. "Congenital Constriction Ring Syndrome in Lower Limb-A Rare Entity." International Journal of Scientific Research 3, no. 5 (2012): 425–26. http://dx.doi.org/10.15373/22778179/may2014/134.

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Rigel, D. F., and S. S. Shetty. "A novel model of conduit coronary constriction reveals local actions of endothelin-1 and prostaglandin F2alpha." American Journal of Physiology-Heart and Circulatory Physiology 272, no. 4 (1997): H2054—H2064. http://dx.doi.org/10.1152/ajpheart.1997.272.4.h2054.

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We evaluated the effects of endothelin-1 (ET-1) and prostaglandin F2alpha (PGF2alpha) selectively on conduit coronary artery diameter using a novel approach in which the local concentration of vasoactive agent was controlled and maintained in vivo. ET-1 and PGF2alpha were applied topically (100 microl every 3 min) to the external surface of the left circumflex coronary artery (LCx) in anesthetized dogs or to the bathing medium of isolated canine LCx rings in parallel in vitro experiments. The dose-dependent constrictions obtained in vivo and in vitro were similar with each agent. Single, appro

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Wu, Z. X., Q. H. Yang, T. Ruan, and L. Y. Lee. "Influence of maturation on constrictive response to stimulation of C-fiber afferents in isolated guinea pig airways." American Journal of Physiology-Lung Cellular and Molecular Physiology 287, no. 1 (2004): L168—L175. http://dx.doi.org/10.1152/ajplung.00156.2003.

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We investigated whether the airway constrictive response to stimulation of bronchopulmonary C-fiber afferents is altered during the maturation process. Isometric tension was measured in airway rings isolated from three tracheobronchial locations (intrathoracic trachea and main and hilar bronchi) and compared in mature [M, 407 ± 10 (SE) g body wt, n = 36] and immature (IM, 161 ± 5 g body wt, n = 35) guinea pigs. Our results showed no difference in the ACh (10−5 M)- or KCl (40 mM)-induced contraction between M and IM groups, regardless of the airway location. In sharp contrast, the concentration

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Lominadze, David, Nina Tsakadze, Utpal Sen, Jeff C. Falcone, and Stanley E. D'Souza. "Fibrinogen and fragment D-induced vascular constriction." American Journal of Physiology-Heart and Circulatory Physiology 288, no. 3 (2005): H1257—H1264. http://dx.doi.org/10.1152/ajpheart.00856.2004.

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Elevated fibrinogen (Fg) concentration in blood is a high risk factor for many cardiovascular diseases. We hypothesize that Fg and its early degradation product, fragment D, may result in arterial constriction by binding endothelial intercellular adhesion molecule-1 (ICAM-1). The vasoconstriction induced by Fg and fragment D was studied in third- and second-order arterioles (3As and 2As, respectively) of Sprague-Dawley rat cremaster muscle in vivo, in aortic and femoral artery rings, and in the segments of first-order arterioles (1As) isolated from rat cremaster muscle. Intravascular infusion

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E Kibria, Rehan. "PSEUDO AINHUM - A PROSPECTIVE STUDY." Professional Medical Journal 21, no. 01 (2014): 044–48. http://dx.doi.org/10.29309/tpmj/2014.21.01.1785.

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Background: Amniotic band syndrome also known as ADAM complex, amnioticband sequence, congenital constrictions, bands and Pseudo Ainhum is a congenital disordercaused by entrapment of fetal parts (usually a limb or digits) in fibrous amniotic bands while inutero. Syndrome which is featured by one or more characteristic fibrous bands that encircle,deepen, strangulate and amputate parts of the human body. It start in a fetus & continuesthroughout life if not checked and treated . It is not an uncommon condition in our country butunfortunately data remains scarce. Design: A prospective study.

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