微波暴露对大鼠GLP-1及其受体表达的影响及与学习记忆功能损伤的关系

探讨了微波暴露对胰高血糖素样肽-1(Glucagon-like peptide-1,GLP-1)及其受体的影响,揭示了GLP-1及其受体变化与大鼠学习记忆功能损伤的关系.分别用Morris水迷宫评价大鼠学习记忆能力,酶联免疫吸附实验(Enzyme-linked immunosorbent assay,ELISA)检测血浆中GLP-1浓度,逆转录多聚酶链反应(Reverse transfer polymerase chain reaction,RT-PCR)检测海马组织中GLP-1R mRNA表达,原位末端标记法(Terminal deoxynucleotidyl transferase mediated Biotin-dUTP nick-end labeling,TUNEL)法检测细胞凋亡.研究发现微波暴露可导致大鼠学习记忆能力下降,血浆中GLP-1浓度降低,海马组织GLP-1R mRNA表达下降,海马脑区神经细胞凋亡.暴露前给予GLP-1可改善微波暴露所致的学习记忆功能损伤,保护神经细胞,降低海马神经细胞凋亡率.GLP-1及其受体参与了微波暴露所致的学习记忆功能损伤,证实GLP-1具有神经保护作用,并拮抗微波暴露所致学习记忆功能损伤.

Effects of microwave exposure on glucagon-like peptide-1 (GLP-1) and its receptor and the relationship with learning and memory injury

In order to explore the effects of microwave exposure on GLP-1 and its receptor, the relationship between the changes of GLP- 1 and its receptor and learning and memory injury induced by microwave exposure has been studied in this paper. Morris water maze was used to evaluate learning and memory ability of rats. The changes of the plasma GLP-1 level were measured by ELISA assay. Alteration of the GLP-1R mRNA expression in rat hippocampus was determined by RT-PCR and Apoptosis was detected by TUNEL. Our study showed that microwave exposure in- jured the learning and memory abilities of rats meanwhile plasma GLP-1 level was decreased and GLP-1R expression in hippocampus was down-regulated, which can be protected by pretreatment with GLP-1. Alterations in GLP-1 and GLP-1R are, at least partially, responsible for the microwave exposure induced learning and memory dysfunction and neuronal injury. These data provide some new clues to investigate the mechanisms of microwave exposure induced neuronal injury and develop clinical approaches for treatment of microwave exposure induced injury. It can provide some new ideals for investigation of related mechanism and development of clinical treatment under exposured microwave irradiation.