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Hydrogen peroxide via thromboxane A2 receptors mediates myogenic response of small skeletal muscle veins in rats.
MedLine Citation:
PMID:  23478229     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We aimed to test two hypotheses: 1) isolated small veins develop substantial myogenic tone in response to elevation of intraluminal pressure, 2) H2O2 contributes to the mediation of myogenic response via activation of arachidonic acid (AA) cascade and release constrictor prostaglandins. METHODS: Small veins were isolated from gracilis muscle of male rats, then cannulated. Changes of diameter to increases in intraluminal pressure, H2O2 and arachidonic acid in the presence and absence of various inhibitors were measured by videomicroscope and microangiometer. At the end of experiments the passive diameter were obtained in Ca2+-free PSS solution. RESULTS: Isolated rat gracilis muscle small veins developed a substantial myogenic tone in response to increases in intraluminal pressure (1-12 mmHg). Calculated maximum myogenic tone was 70 ± 5% at 10 mmHg. Presence of catalase or indomethacin or SQ 29,548 reduced significantly the pressure-induced myogenic response. Also, H2O2 (10-9-10-5 M) and arachidonic acid (10-7-10-4 M) elicited concentration dependent constrictions, which were inhibited by the presence of indomethacin or SQ 29,548. CONCLUSION: We propose that both myogenic response and pressure-induced release of H2O2 play important roles in regulating the vasomotor function of venules both in physiological and pathological conditions.
Authors:
B Debreczeni; Z Veresh; E Gara; A Marki; A Racz; R Matics; J Hamar; A Koller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-11
Journal Detail:
Title:  Clinical hemorheology and microcirculation     Volume:  -     ISSN:  1875-8622     ISO Abbreviation:  Clin. Hemorheol. Microcirc.     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9709206     Medline TA:  Clin Hemorheol Microcirc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Plastic Surgery, Military Hospital - State Health Centre, Budapest, Hungary Department of Pathophysiology, Semmelweis University, Budapest, Hungary.
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