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[Endogenous protective effects of superoxide dismutases on infectious brain injury in rats]
1Department of Pediatrics, Xiangya Hospital, Hunan Medical University, Changsha 410008.
Abstract:
We studied the alterations of MDA and three forms of SOD activities such as T-SOD, CuZn-SOD, and Mn-SOD in rat cerebral tissues injected by bordetella pertussis (BP) to elucidate protective mechanism of SOD against the infectious brain injury. The results were that water content(WC), Evans blue content(EB), MDA, and Mn-SOD activities in 4 h and 24 h BP-treated groups increased and T-SOD and CuZn-SOD decreased compared to corresponding normal saline(NS)-treated groups, respectively(P < 0.01); MDA increased and had a positive correlation with WC and EB in 4 h BP treated group (r = 0.9650, r = 0.9441, P < 0.01, P < 0.01, respectively); Mn-SOD activities were elevated and had a negative correlation with WC, EB, and MDA (r = -0.8650, r = -0.9021, r = -0.9346, P < 0.01, P < 0.01, P < 0.01, respectively) in 24 h BP-treated group. The results suggest that the increase of component Mn-SOD activities may play an important role in vivo endogenous protective mechanism against delayed infectious brain injury.
Insights
Bordetella pertussis (BP) infection increases brain injury markers like MDA and water content. However, Manganese Superoxide Dismutase (Mn-SOD) activity rises, suggesting a protective role against infectious brain damage.
Area of Science:
- Neuroscience
- Immunology
- Biochemistry
Background:
- Infectious brain injuries can lead to significant neurological damage.
- Superoxide Dismutase (SOD) is a critical antioxidant enzyme involved in cellular defense.
- Understanding the role of SOD in infectious brain injury is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the alterations in Malondialdehyde (MDA) and Superoxide Dismutase (SOD) activities in rat cerebral tissues following Bordetella pertussis (BP) infection.
- To elucidate the protective mechanism of SOD against infectious brain injury induced by BP.
- To correlate biochemical changes with markers of brain injury.
Main Methods:
- Rats were injected with Bordetella pertussis (BP) or normal saline (NS).
- Cerebral tissues were analyzed for water content (WC), Evans blue content (EB), MDA levels, and activities of T-SOD, CuZn-SOD, and Mn-SOD at 4 and 24 hours post-injection.
- Statistical analysis, including correlation studies, was performed.
Main Results:
- BP injection significantly increased WC, EB, MDA, and Mn-SOD activities, while decreasing T-SOD and CuZn-SOD activities at 4 and 24 hours compared to NS-treated groups (P < 0.01).
- MDA showed a positive correlation with WC and EB in the 4-hour BP-treated group (r = 0.9650, r = 0.9441, P < 0.01).
- Mn-SOD activities were elevated and negatively correlated with WC, EB, and MDA in the 24-hour BP-treated group (r = -0.8650, r = -0.9021, r = -0.9346, P < 0.01).
Conclusions:
- The study suggests that increased Manganese Superoxide Dismutase (Mn-SOD) activity plays a significant role in the endogenous protective mechanism against delayed infectious brain injury.
- These findings highlight the potential of Mn-SOD as a therapeutic target for managing Bordetella pertussis-induced brain damage.
