線粒體分裂抑制劑-1在大鼠急性脊髓損傷中的保護作用及其機制
[Abstract]:Objective To investigate the effects of selective mitochondrial splitting inhibitor-1 (Mdivi-1) on mitochondrial damage and apoptosis in rats with acute spinal cord injury (ASCI), and to provide important clues for the study of secondary injury mechanism and clinical target drug therapy of ASCl. Methods SD rats were randomly divided into four groups: sham operation. Group A (Sham group), Sham+Mdivi-1 preconditioning group (1.20 mg/kg, Sham+Mdivi-1 group), SCI+Mdivi-1 preconditioning group (SCI group) and SCI+Mdivi-1 preconditioning group (1.20 mg/kg, SCI+Mdivi-1 group). Rats in SCI and SCl+Mdivi-1 groups were given ASCl model by Allen's method, and rats in Sham+Mdivi-1 and SCI+Mdivi-1 groups were given via caudal vein 15 minutes before spinal cord injury. Rats in the Mdivi-1 SCI group were sacrificed at five time points, 2,4,8,16 and 24 hours (h), respectively. Rats in the Sham group, Sham+Mdivi-1 group and SCl+Mdivi-1 group were sacrificed 16 hours after spinal cord exposure or injury. First, the release of cytochrome C (Cytochrome C, Cyt C) in mitochondria was detected by Western blotting at each time point after spinal cord injury. Then, ASCl or 16 hours after exposure were selected as the time point to detect the effect of Mdivi-1. The morphological changes of mitochondria were detected by transmission electron microscopy (TEM), the changes of mitochondrial membrane potentials (MMP) in spinal cord tissue were detected by JC-I labeling method, and the changes were detected by visible spectrophotometer. Mitochondrial adenosine triphosphate (ATP), malondialdehyde (MDA) and reduced glutathione (GSH) levels in the spinal cord of rats in each group were measured by Western Blot. Dynamin-related protein 1 (Drp1), Cyt C and Bcl-2 phases in the spinal cord of rats in each group were detected by Western Blot. To investigate the effects of Bcl-2-associated X protein (Bax) and B-cell lymphoma gene-2 (Bcl-2) and intracellular Caspase-3 expression, immunofluorescence labeling technique was used to detect the expression of Caspase-3 in rat spinal cord tissues. Fluorescence TUNEL method was used to detect the apoptosis of spinal cord tissues. The results of stern Blot assay showed that compared with Sham group, Cyt C in mitochondria of SCI group decreased significantly from 4 h to 16 h, reached the lowest value, then gradually increased to 24 h (P 0.01); Cyt C in cytoplasm increased from 4 h to 16 h, reached the peak, and then decreased gradually (P 0.01). Drp 1, Bax and Bcl-2 in mitochondria extracellular membrane increased significantly 16 h after ASCI compared with Sham group. Compared with the SCI group, the expression of Cyt C in mitochondria of SCI+Mdivi-1 group was higher (P 0.01), but the expression of Cyt C in cytoplasm was lower (P 0.01), the expression of Drp 1 and Bax in mitochondria outer membrane was significantly lower (P 0.01), and the expression of Caspase-3 in cells was significantly lower (P 0.01). The results of transmission electron microscopy showed that the number of mitochondria and the cross-sectional area of mitochondria increased significantly at 16 h after ASCI compared with Sham group (P 0.01); the number of mitochondria decreased significantly and the cross-sectional area increased significantly at 16 h after ASCI compared with SCI group (P 0.01). However, there was no significant change in the expression of the above indexes between Sham group and Sham+Mdivi-1 group. The results showed that the levels of ATP and GSH in mitochondria were significantly lower at 16 h after ASCl than those in Sham group (P There was no significant change in the levels of GSH and MAD. Immunofluorescence assay showed that the percentage of Caspase-3 positive cells increased significantly at 16 h after ASCl (P 0.01); the percentage of Caspase-3 positive cells in SCl+Mdivi-1 group was significantly lower than that in SCI group at 16 h (P 0.01). The percentage of apoptosis in SCl+Mdivi-1 group was significantly lower than that in SCI group (P 0.01). However, there was no significant change in the percentage of apoptosis between Sham group and Sham+Mdivi-1 group. The level of MP and ATP inhibited mitochondrial oxidative damage and activation of mitochondrial pathway.
【學位授予單位】:遼寧醫(yī)學院
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:R651.2
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