Effects of Rat Anti-mouse Interleukin-6 Receptor Antibody on the Recovery of Cognitive Function in Stroke Mice

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Abstract
This study aimed to investigate the effects of rat anti-mouse interleukin (IL)-6 receptor antibody (MR16-1) on the recovery of cognitive function in stroke mice. Adult male C57BL/6 mice were subjected to middle cerebral artery occlusion (MCAO). Mice were randomly assigned into three groups: sham group, model group, and MR16-1 group. After the treatment of MR16-1, spatial learning and memory performance of mice were evaluated by the Morris water maze (MWM) and Y-maze tests. Then, brain slices were obtained and infarct volume and neuronal apoptosis were assessed by 2,3,5-triphenyltetrazolium chloride (TTC) staining and Terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay, respectively. Protein expression levels of apoptosis-associated proteins and multiple inflammatory cytokines were determined by Western blot analysis. Real-time quantitative PCR (RT-PCR) was used to examine the mRNA levels of various inflammatory cytokines in brain slices and cerebrospinal fluid (CSF). The results showed that MR16-1 improved performances of stroke mice in MWM and Y-maze tests. Moreover, MR16-1 ameliorated MCAO-induced infarct, neuronal apoptosis, and inflammatory response. Furthermore, MR16-1 promoted the expression of Bcl-2 and inhibited the expression of Bax in stroke mice, which revealed the inhibitory effect of MR16-1 on neuronal apoptosis. IL-6 levels in brain and CSF were both decreased by MR16-1 treatment in stroke mice. MR16-1 ameliorated cognitive dysfunction and apoptosis in stroke mice, involving the inhibition of inflammatory response and pro-apoptotic Bax, and the up-regulation of anti-apoptotic Bcl-2. The data supported that MR16-1 might be a potential therapeutic drug for the treatment of stroke.

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