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AJP - Gastrointestinal and Liver Physiology, Vol 257, Issue 5 683-G688, Copyright © 1989 by American Physiological Society
ARTICLES |
D. N. Granger, J. N. Benoit, M. Suzuki and M. B. Grisham
Department of Physiology and Biophysics, Louisiana State University Medical Center, Shreveport 71130-3932.
Xanthine oxidase-derived oxidants and leukocytes have been implicated in the microvascular injury associated with reperfusion of ischemic intestine. The objective of this study was to determine whether xanthine oxidase-derived oxidants play a role in the leukocyte-microvascular interactions initiated by ischemia-reperfusion. Adherence and extravasation of leukocytes were monitored in cat mesenteric venules subjected to 1 h of ischemia (blood flow reduced to 20% of control) and reperfusion. Leukocyte rolling velocity, vessel diameter, and red cell velocity were also measured in control (untreated) animals and in animals pretreated with either allopurinol or superoxide dismutase. The responses of venular blood flow, wall shear rate, and leukocyte rolling velocity to ischemia and reperfusion did not differ between the three experimental groups. In control animals, 1 h of ischemia was associated with significant adherence and extravasation of leukocytes with reperfusion greatly enhancing these responses. Allopurinol treatment did not alter the responses to ischemia per se, yet it largely prevented the further increment in adherence and extravasation associated with reperfusion. Superoxide dismutase treatment attenuated the leukocyte responses elicited by both ischemia and reperfusion. Our observations that both allopurinol and superoxide dismutase attenuate reperfusion-induced leukocyte adherence and extravasation are consistent with the hypothesis that xanthine oxidase-derived oxidants initiate the leukocyte infiltration induced by reperfusion of ischemic intestine.
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