Effects of repeated +Gz exposures on lipid peroxidation of various organs in rats.
OBJECTIVE
To investigate the change of lipid peroxidation in various organs of rats after repeated +10 Gz stress.


METHODS
Twenty male Wistar rats were randomly divided into control (+1 Gz) group and +10 Gz group (n = 10 for each group ). The two groups were exposed to +1 Gz or +10 Gz on an animal centrifuge respectively. The onset rate of +Gz was 0.5 G/s; the sustained time at peak +Gz was 30 s each time, with 5 times/d, 1 min intervals, 3 d/wk, 3 wk in total. The rats were decapitated in ice bath on the next day after the last +Gz exposure. The lung, heart, liver and kidney of rats were collected for the following determinations. These organs were made into homogenates and the mitochondria of heart and kidney were isolated from their homogenates. Then malondialdehyde (MDA) content , superoxide dismutase (SOD) activity and glutathion (GSH) concentration in these homogenates and mitochondria were determined individually.


RESULTS
Compared with the control, MDA concentration in myocardial mitochondria increased significantly (P < 0.01) after repeated +10 Gz exposures, and the SOD activity in liver homogenate and renal mitochondria decreased remarkably (P < 0. 01). But there was no significant difference between GSH concentrations of the two groups.


CONCLUSIONS
Repeated +10 Gz stress induced lipid peroxidation injury of myocardial mitochondria and had some influences on the oxygen radical metabolism of liver and kidney in rats.
Zhang
Q J
QJ
Institute of Aviation Medicine, The Air Force, Beijing 100036.
Zhan
H
H
Li
T
T
Xin
Y M
YM
Tang
G X
GX
Yan
G D
GD
D000818:Animals; D002498:Centrifugation; D005978:Glutathione / Q000378:metabolism*; D018471:Hypergravity; D007668:Kidney / Q000201:enzymology / Q000378:metabolism; D015227:Lipid Peroxidation / Q000502:physiology*; D008099:Liver / Q000201:enzymology / Q000378:metabolism; D008168:Lung / Q000201:enzymology / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism*; D008928:Mitochondria / Q000201:enzymology / Q000378:metabolism; D008929:Mitochondria, Heart / Q000201:enzymology / Q000378:metabolism; D009206:Myocardium / Q000201:enzymology / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism*
D008315:Malondialdehyde; D013482:Superoxide Dismutase; D005978:Glutathione