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Published on: October 18, 2011
CORM-3 Regulates Microglia Activity, Prevents Neuronal Injury, and Improves Memory Function During Radiation-induced
Kui Lu1, Wen-Jun Wu1, Cheng Zhang2
1Department of Neurology, Zhongshan City People's Hospital, Zhongshan, Guangdong 528403, China.
Objective:
This study aims to explore in detail, the mechanism of the carbon monoxide releasing molecule-3 (CORM-3) in regulating the activity of microglia (MG) in the treatment of radiation brain injury (RBI).
Methods:
The brain injury models of BV2 cells and Balb/C mice were established and randomly divided into three groups: the normal control group (CON), the single radiation group (RAD), and the radiation plus CORM-3 intervention group (RAD+CORM). Immunofluorescence was used to observe the effects on activation of the MG. The expressions of inflammatory factors, such as intercellular adhesion molecule-1 (ICAM-1) and inducible nitric oxide synthase (iNOS), were detected by Western blot. Neuron apoptosis and regeneration in the radiation brain injury (RBI) model were detected by neuronal nuclear antigen (NeuN)+TUNEL and NeuN+BrdU double staining. A Morris water maze was used to assess the spatial learning and memory of the mice.
Results:
Within 48 h after radiation, CORM-3 inhibited activation of the MG, blocked the phosphorylation of P38, and increased the expression of ICAM-1 and iNOS. Therefore, CORM-3 might alleviate MG-mediated neuronal apoptosis and promote neural regeneration in the subgranular zone (SGZ) of the dentate gyrus of the hippocampus. CORM-3 could increase the swimming distance and platform-stay time of the mice in the target platform quadrant after radiation.
Conclusion:
CORM-3 could effectively improve the inflammatory response induced by activation of the MG, reduce neuronal apoptosis, promote neural regeneration, and improve the learning and memory performance of mice after radiation.
Insights
Carbon monoxide-releasing molecule-3 (CORM-3) effectively treats radiation brain injury (RBI) by reducing microglia activation and inflammation. This intervention promotes neural regeneration and improves cognitive function in mice.
Area of Science:
- Neuroscience
- Radiology
- Pharmacology
Background:
- Radiation brain injury (RBI) is a significant clinical challenge.
- Microglia (MG) play a critical role in the inflammatory response following RBI.
- Targeting microglial activation is a potential therapeutic strategy for RBI.
Purpose of the Study:
- To investigate the mechanism of carbon monoxide-releasing molecule-3 (CORM-3) in regulating microglia activity in radiation brain injury (RBI).
- To evaluate the therapeutic effects of CORM-3 on neuronal apoptosis, regeneration, and cognitive function in a mouse model of RBI.
Main Methods:
- Establishment of BV2 cell and Balb/C mouse models of radiation brain injury.
- Intervention with CORM-3 in radiation-exposed groups.
- Assessment of microglial activation, inflammatory factor expression (ICAM-1, iNOS), neuronal apoptosis, neurogenesis, and spatial learning/memory (Morris water maze).
Main Results:
- CORM-3 inhibited microglial activation and P38 phosphorylation within 48 hours post-radiation.
- CORM-3 increased the expression of ICAM-1 and iNOS.
- CORM-3 treatment reduced neuronal apoptosis, promoted neural regeneration in the hippocampus, and improved spatial learning and memory in mice.
Conclusions:
- CORM-3 effectively mitigates the inflammatory response mediated by microglia activation in radiation brain injury.
- CORM-3 demonstrates neuroprotective effects by reducing neuronal apoptosis and enhancing neurogenesis.
- CORM-3 treatment significantly improves cognitive deficits associated with radiation brain injury.
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