Previously we have shown that thermal injury of skin in rats causes activation of the complement system, development of acute intravascular hemolysis and injury of the lung microvasculature, appearance of lipid peroxidation products, and pronounced functional defects in phagocytic cells. The proposed studies will evaluate the role of toxic oxygen products in the microvascular damage of thermally injured skin and the possible sources of these oxygen products (NADPH oxidase of phagocytic cells) or xanthine oxidase (in the thermally injured skin). We will also determine if ATP breakdown products appear during the course of thermal injury, if their appearance is prevented by the interposition of protective antioxidant interventions, and if the thermally injured skin is the likely source of the ATP breakdown products. Finally, we will evaluate further the dysfunctions of blood neutrophils in thermally injured animals, determine if the abnormalities are prevented by protective antioxidant interventions, and assess if defective neutrophils have diminished ATP levels which are not affected in oxidant-protected animals. These studies should provide important information on the pathogenesis of microvascular damage in thermally injured skin.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM039397-02
Application #
3296345
Study Section
General Medicine A Subcommittee 2 (GMA)
Project Start
1988-02-01
Project End
1991-01-31
Budget Start
1989-02-01
Budget End
1990-01-31
Support Year
2
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Type
Schools of Medicine
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109
Till, G O; Friedl, H P; Ward, P A (1991) Lung injury and complement activation: role of neutrophils and xanthine oxidase. Free Radic Biol Med 10:379-86
Caty, M G; Schmeling, D J; Friedl, H P et al. (1990) Histamine: a promoter of xanthine oxidase activity in intestinal ischemia/reperfusion. J Pediatr Surg 25:218-22;discussion 222-3
Friedl, H P; Till, G O; Trentz, O et al. (1989) Roles of histamine, complement and xanthine oxidase in thermal injury of skin. Am J Pathol 135:203-17