Study of protective effect and mechanism of HSPB8 on diabetic neurons
-
摘要: 目的 观察HSPB8在自发性2型糖尿病db/db小鼠脊髓组织中的表达,探讨HSPB8发挥神经保护性作用的机制。 方法 选择8周龄,雄性,db/m小鼠(db/m组),糖尿病db/db小鼠(db/db组),各10只。动态观察体重、空腹血糖;HE染色观察小鼠脊髓组织损伤情况;qRT-PCR检测HSPB8、Caspase-1、IL-18、P62和LC3基因mRNA表达;Western blotting检测HSPB8、Caspase-1、IL-18、P62和LC3蛋白表达。分别用11、25、30和35 mmol/L葡萄糖浓度刺激RGC-5细胞48 h为糖尿病体外模型,Western blotting检测HSPB8、Caspase-1、IL-18、LC3和P62蛋白表达。RGC-5细胞沉默HSPB8蛋白,高糖(35 mmol/L)刺激48 h,Western blotting检测HSPB8、Caspase-1、IL-18、LC3和P62蛋白表达。组间比较采用成组t检验和单因素方差分析。 结果 (1)HE染色结果表明db/db小鼠脊髓组织出现损伤;(2)qRT-PCR结果表明HSPB8、Caspase-1、IL-18、P62和LC3基因均在糖尿病脊髓组织中表达;(3)Western blotting结果表明,与db/m组小鼠相比,db/db小鼠受损脊髓组织中HSPB8、LC3-Ⅱ表达下降,Caspase-1、IL-18和P62表达均升高(均P<0.05);不同浓度高糖刺激后,随着血糖浓度升高,HSPB8、LC3-Ⅱ表达下降,Caspase-1、IL-18和P62表达升高(均P<0.05);(4)RGC-5细胞HSPB8沉默后高糖刺激48 h,Caspase-1、IL-18和P62蛋白表达均升高而LC3-Ⅱ表达下降(均P<0.05)。 结论 HSPB8在糖尿病神经病变中发挥重要保护性作用,其机制可能与HSPB8影响神经细胞中的炎性因子及自噬过程相关。Abstract: Objective To observe the expression of HSPB8 in spinal cord tissues of spontaneous type 2 diabetes db/db mice, and explore the neuroprotective mechanism of HSPB8. Methods Eight weeks old, male, db/m mouse(db/m group, 10 mice), db/db mouse(db/db group, 10 mice) were selectd. Body weight and fasting blood glucose were dynamical observation. HE staining was used to observe spinal cord in mice. mRNA expressions of HSPB8, Caspase-1, IL-18, P62 and LC3 were detected by qRT-PCR. For the in vitro model of diabetes, RGC-5 cells were stimulated with glucose concentrations of 11, 25, 30 and 35 mmol/L for 48 hours, respectively. RGC-5 cells were silenced by HSPB8 protein and stimulated by high glucose(35 mmol/L) for 48 h. HSPB8, Caspase-1, IL-18, P62 and LC3 were detected by western blot. Group t-test and one-way ANOVA were used for comparison between groups. Results (1)HE staining results showed that spinal cord tissue of db/db mice was damaged;(2)qRT-PCR results showed that HSPB8, Caspase-1, IL-18, P62 and LC3 were expressed in diabetic spinal cord tissues;(3)Western blotting results showed that compared with the db/m group of mice, the db/db mice were damaged spinal cord tissues HSPB8, LC3-Ⅱexpression were decreased, and the Caspase 1, IL-18, P62 expression were increased(all P<0.05). With the increase of blood glucose concentration, the expression of HspB8, LC3-Ⅱwere decreased, and the caspase-1, IL-18 and p62 were increased(all P<0.05);(4)Forty-eight hours after RGC-5 cells HSPB8 silence sugar stimulation, the Caspase 1, IL-18 and P62 protein expression were increased and LC3-Ⅱexpression were declined(all P<0.05). Conclusion HSPB8 plays an important protective role in diabetic neuropathy, and its mechanism may be related to the effect of HSPB8 on inflammatory factors and autophagy in neurons.
-
Key words:
- HSPB8 /
- Diabetes mellitus /
- Spinal cord tissues /
- Caspase-1
点击查看大图
计量
- 文章访问数: 164
- HTML全文浏览量: 24
- PDF下载量: 0
- 被引次数: 0