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Interleukin 17A deficiency alleviates neuroinflammation and cognitive impairment in an experimental model of diabetic encephalopathy

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Neural Regeneration Research 2022年第12期17卷 2771-2777页

作者： Xiao-Xia Fang Fen-Fen Xu Zhan Liu Bei-Bei Cao Yi-Hua Qiu Yu-Ping Peng Department of Physiology School of Medicineand Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina

Interleukin 17A(IL-17A)was previously shown to be a key pro-inflammatory factor in diabetes mellitus and associated complications.However,the role of IL-17A in diabetic encephalopathy remains poorly understood.In this study,we established a mouse model of diabetic encephalopathy that was deficient in IL-17A by crossing Il17a-/-mice with spontaneously diabetic Ins2^(akita)(akita)mice.Blood glucose levels and body weights were monitored from 2-32 weeks of age.When mice were 32 weeks of age,behavioral tests were performed,including a novel object recognition test for assessing short-term memory and learning and a Morris water maze test for evaluating hippocampus-dependent spatial learning and memory.IL-17A levels in the serum,cerebrospinal fluid,and hippocampus were detected with enzyme-linked immunosorbent assays and real-time quantitative polymerase chain reaction.Moreover,proteins related to cognitive dysfunction(amyloid precursor protein,β-amyloid cleavage enzyme 1,p-tau,and tau),apoptosis(caspase-3 and-9),inflammation(inducible nitric oxide synthase and cyclooxygenase 2),and occludin were detected by western blot assays.Pro-inflammatory cytokines including tumor necrosis factor-α,interleukin-1β,and interferon-γin serum and hippocampal tissues were measured by enzyme-linked immunosorbent assays.Microglial activation and hippocampal neuronal apoptosis were detected by immunofluorescent staining.Compared with that in wild-type mice,mice with diabetic encephalopathy had higher IL-17A levels in the serum,cerebrospinal fluid,and hippocampus;downregulation of occludin expression;lower cognitive ability;greater loss of hippocampal neurons;increased microglial activation;and higher expression of inflammatory factors in the serum and hippocampus.IL-17A knockout attenuated the abovementioned changes in mice with diabetic encephalopathy.These findings suggest that IL-17A participates in the pathological process of diabetic encephalopathy.Furthermore,IL-17A deficiency reduces diabetic encephalopathy-mediated neuroinflammati

关键词： Akita mice apoptosis cognitive impairment diabetic encephalopathy hippocampus interleukin 17A mice microglia neuroinflammation neuron targeted treatment

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