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Maximum skin hyperaemia induced by local heating: possible mechanisms.
Kim M Gooding1, Michael M Hannemann, John E Tooke
1Institute of Biomedical and Clinical Sciences, Peninsula Medical School, Exeter, UK.
Journal of Vascular Research
|February 25, 2006
Summary
Nitric oxide (NO) is crucial for skin hyperaemia during heating and its resolution afterward. This pathway, not prostaglandins or histamine, drives blood flow changes, impacting individuals at risk for diabetes and cardiovascular disease.
Area of Science:
- Physiology
- Vascular Biology
- Dermatology
Background:
- Maximum skin hyperaemia (MH) upon heating is impaired in individuals at risk for diabetes and cardiovascular disease.
- The precise mechanisms underlying MH attainment remain unclear, hindering interpretation of these findings.
Purpose of the Study:
- To investigate the mechanisms of maximum skin hyperaemia (MH) induced by local heating.
- To determine the roles of prostaglandins, histamine, and the nitric oxide (NO) pathway in mediating and resolving heat-induced skin blood flow.
Main Methods:
- Utilized a double-blind, randomized, placebo-controlled crossover study design.
- Assessed MH using laser Doppler fluximetry after local skin heating to 42-43°C for 30 minutes.
- Investigated the roles of prostaglandins (aspirin), histamine (cetirizine), and the NO pathway (L-NAME, sildenafil).
Main Results:
- Nitric oxide (NO) synthase inhibition with L-NAME significantly reduced MH (p = 0.008).
- NO production inhibition led to a faster resolution of hyperaemia post-heating (p = 0.011).
- Prostaglandins, histamine, and sildenafil did not significantly alter MH, while sildenafil prolonged hyperaemia (p = 0.003).
Conclusions:
- Nitric oxide (NO) significantly contributes to the increase in skin blood flow during heating.
- NO is also involved in the resolution of heat-induced hyperaemia.
- Prostaglandins, histamine, and axon reflexes play minimal roles in this process.