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Different effects of immobilization stress on the mRNA expression of antioxidant enzymes in rat peripheral organs
1Department of Hygiene and Public Health, School of Human Sciences, Waseda University, Saitama, Japan. k-oishi@pharm.teikyo-u.ac.jp
Abstract:
To understand the role of antioxidant enzymatic defenses in reactive oxygen species (ROS) injury following immobilization stress, we examined the effect on mRNA expression of four antioxidant enzymes, manganese superoxide dismutase (Mn-SOD), copper and zinc containing SOD (Cu/Zn-SOD), glutathione peroxidase (GPx) and catalase (CAT), in peripheral rat organs. Immediately after 6h of immobilization, the mRNA levels of all antioxidants examined were markedly decreased in the liver, while 24 h after the cessation of immobilization, the mRNA expressions recovered to baseline levels. In contrast, the adrenal mRNA levels of Mn-SOD and CAT were increased by stress, and the increased levels of these mRNAs were maintained 24h after cessation of stress. The stress did not affect the mRNA levels of antioxidants in the heart, lung and kidney. Our results suggest that the antioxidant defense status in peripheral tissues is influenced by immobilization stress and that tissue-specific regulation mechanisms of antioxidant enzymes exist in rats.
Insights
Immobilization stress impacts antioxidant enzymes differently across rat organs. Liver antioxidant mRNA decreased then recovered, while adrenal Mn-SOD and CAT mRNA increased, showing tissue-specific stress responses.
Area of Science:
- Biochemistry
- Physiology
- Stress Response
Background:
- Reactive oxygen species (ROS) can cause cellular damage.
- Antioxidant enzymes are crucial for mitigating ROS injury.
- The impact of immobilization stress on these defenses is not fully understood.
Purpose of the Study:
- To investigate the role of antioxidant enzymatic defenses in response to immobilization stress.
- To examine the mRNA expression of key antioxidant enzymes in peripheral rat organs.
Main Methods:
- Assessed mRNA levels of manganese superoxide dismutase (Mn-SOD), copper and zinc containing SOD (Cu/Zn-SOD), glutathione peroxidase (GPx), and catalase (CAT).
- Analyzed changes in liver, adrenal gland, heart, lung, and kidney following 6 hours of immobilization and 24 hours post-stress.
- Utilized quantitative analysis of gene expression.
Main Results:
- Liver antioxidant mRNA levels significantly decreased immediately after immobilization but recovered to baseline within 24 hours.
- Adrenal mRNA levels of Mn-SOD and CAT increased due to stress and remained elevated 24 hours after stress cessation.
- No significant changes in antioxidant mRNA levels were observed in the heart, lung, or kidney.
Conclusions:
- Immobilization stress induces tissue-specific alterations in antioxidant enzyme mRNA expression in rats.
- These findings suggest distinct regulatory mechanisms governing antioxidant defenses in different peripheral organs.
- Antioxidant enzymatic defenses play a role in managing ROS injury during immobilization stress.
