Immunohistochemical study of the kidneys after severe muscular injury.
Severe muscular injury sometimes causes renal failure, and myoglobin in skeletal muscle is known to induce toxic free oxygen radicals in the kidneys. The relationship between the immunohistochemical expression of myoglobin and the scavenger copper/zinc superoxide dismutase (Cu/Zn-SOD) was investigated in kidneys taken from two autopsy groups, a group with tourniquet shock (n = 4), and a group with severely injured skeletal muscle (n = 18). Paraffin-embedded kidney sections were used for immunohistochemical staining by the avidin-biotin-complex (ABC) method using antibodies against myoglobin and Cu/Zn-SOD. Detection of the two antigens was analyzed qualitatively. In most cases of tourniquet shock in which the survival time was considered to be relatively long, myoglobin staining was positive and Cu/Zn-SOD was negative. Among the seven cases of severely injured skeletal muscle in which the survival period was considered to be relatively short, positive staining was detected immunohistochemically for both myoglobin and Cu/Zn-SOD. Moreover, in most of the cases in this group that showed acute tubular necrosis, immunohistochemical staining was negative for both markers, whereas positive staining was found for most of the cases in which the kidneys were revealed to be normal by HE staining. These findings suggest that when myoglobin enters the kidneys via the circulation, Cu/Zn-SOD reacts to eliminate free radicals, but is depleted by consumption in the long run, and that there might be a relationship between these histological findings and immunohistochemical expression.
Abe
M
M
Department of Legal Medicine, School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba, Japan.
Saitoh
H
H
Sato
Y
Y
Hamaguchi
K
K
Kiuchi
M
M
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001344:Autopsy / Q000379:methods*; D016022:Case-Control Studies; D005260:Female; D016166:Free Radical Scavengers / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000293:injuries* / Q000378:metabolism / Q000473:pathology; D009135:Muscular Diseases / Q000150:complications / Q000378:metabolism / Q000473:pathology; D009211:Myoglobin / Q000378:metabolism; D051437:Renal Insufficiency / Q000209:etiology / Q000378:metabolism / Q000473:pathology*; D013482:Superoxide Dismutase / Q000378:metabolism
D016166:Free Radical Scavengers; D009211:Myoglobin; D013482:Superoxide Dismutase