摘要
Radiation therapy is a standard treatment for head and neck tumors.However,patients often exhibit cognitive impairments following radiation therapy.Previous studies have revealed that hippocampal dysfunction,specifically abnormal hippocampal neurogenesis or neuroinflammation,plays a key role in radiation-induced cognitive impairment.However,the long-term effects of radiation with respect to the electrophysiological adaptation of hippocampal neurons remain poorly characterized.We found that mice exhibited cognitive impairment 3 months after undergoing 10 minutes of cranial irradiation at a dose rate of 3 Gy/min.Furthermore,we observed a remarkable reduction in spike firing and excitatory synaptic input,as well as greatly enhanced inhibitory inputs,in hippocampal CA1 pyramidal neurons.Corresponding to the electrophysiological adaptation,we found reduced expression of synaptic plasticity marker VGLUT1 and increased expression of VGAT.Furthermore,in irradiated mice,long-term potentiation in the hippocampus was weakened and GluR1 expression was inhibited.These findings suggest that radiation can impair intrinsic excitability and synaptic plasticity in hippocampal CA1 pyramidal neurons.
基金
supported by the National Natural Science Foundation of China,Nos.81925031(to YT),81820108026(to YT),81972967(to WJL),81872549(to YL)
the Youth Program of National Natural Science Foundation of China,No.81801229(to YTX)
a grant from Guangdong Science and Technology Department of China,Nos.2020B1212060018(to WJL),2020B1212030004(to WJL)
the Natural Science Foundation of Guangdong Province,No.2019A1515011754(to WJL)
the Science and Technology Program of Guangzhou of China,No.202007030001(to YT)
the Science and Technology Planning Project of Guangzhou of China,No.201704030033(to YL).
