Bradykinin does not mediate cutaneous active vasodilation during heat stress in humans
1 Geriatric Research, Education, and Clinical Center, Department of Veterans Affairs, South Texas Veterans Health Care System, Audie L. Murphy Memorial Veterans Hospital Division, and Divisions of 2 Geriatrics and Gerontology and 3 Nephrology, Department of Medicine, University of Texas Health Sc...
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Veröffentlicht in: | Journal of applied physiology (1985) 2002-10, Vol.93 (4), p.1215-1221 |
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Sprache: | eng |
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Zusammenfassung: | 1 Geriatric Research, Education, and Clinical
Center, Department of Veterans Affairs, South Texas Veterans Health
Care System, Audie L. Murphy Memorial Veterans Hospital Division,
and Divisions of 2 Geriatrics and Gerontology and
3 Nephrology, Department of Medicine, University of
Texas Health Science Center at San Antonio, San Antonio, Texas 78229
To test
the hypothesis that bradykinin effects cutaneous active vasodilation
during hyperthermia, we examined whether the increase in skin blood
flow (SkBF) during heat stress was affected by blockade of bradykinin
B 2 receptors with the receptor antagonist HOE-140.
Two adjacent sites on the forearm were instrumented with intradermal
microdialysis probes for local delivery of drugs in eight healthy
subjects. HOE-140 was dissolved in Ringer solution (40 µM) and
perfused at one site, whereas the second site was perfused with Ringer
alone. SkBF was monitored by laser-Doppler flowmetry (LDF) at
both sites. Mean arterial pressure (MAP) was monitored from a finger,
and cutaneous vascular conductance (CVC) was calculated (CVC = LDF/MAP). Water-perfused suits were used to control body temperature
and evoke hyperthermia. After hyperthermia, both microdialysis sites
were perfused with 28 mM nitroprusside to effect maximal vasodilation.
During hyperthermia, CVC increased at HOE-140 (69 ± 2% maximal
CVC, P |
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ISSN: | 8750-7587 1522-1601 |
DOI: | 10.1152/japplphysiol.01142.2001 |