Effect of restraint stress at different periods on SOD and MDA of normal rat serums and mucosal tissues / 实用医学杂志

ABSTRACT

Objective To investigate the effects of restraint stress (RS) in different periods on SOD and MDA of normal rat serums and mucosal tissues. Methods 32 adult male Wistar rats were randomly divided into normal control group (NC group, n=8), and restraint stress groups of 3 days, 5 days and 7 days (RS3, RS5 and RS7 groups, n=8 at each group). The comparisons were done between all the groups in terms of the general extent of gastric mucosal injury, gastric mucosal injury ulcer index (UI), water content, the activity of super oxide dismutase (SOD), and the level of malondialdehyde (MDA) in serum and mucosal. Results Compared with NC group, gastric mucosal injuries in RS group were more severe, the UI and water content was proportionally related with the restraint periods. Meanwhile, the serum and mucosal SOD in the RS groups were all increased, and with prolonged restraints, the SOD were decreased, but the serum and mucosal MDA were increased (P<0.01) and SOD/MDA in the mucosa lowered as well (P<0.01). Conclusion Restraint stress may cause mucosal injury proportional to the stress time and related with lowered SOD/MDA in mucosal tissues.