抑制性突触后电位
嗅球
γ-氨基丁酸受体
神经科学
突触后电位
麝香醇
嗅觉系统
兴奋剂
加巴能
神经传递
化学
生物
受体
中枢神经系统
生物化学
作者
Bin Hu,Chi Geng,Feng Guo,Ying Liu,Yu-Chen Zong,Xiaoyu Hou
标识
DOI:10.1016/j.neurobiolaging.2021.08.003
摘要
Olfactory damage develops at the early stages of Alzheimer's disease (AD). While amyloid-β (Aβ) oligomers are shown to impair inhibitory circuits in the olfactory bulb (OB), its underlying mechanisms remain unclear. Here, we investigated the olfactory dysfunction due to impaired inhibitory transmission to mitral cells (MCs) of the OB in APP/PS1 mice. Using electrophysiological studies, we found that MCs exhibited increased spontaneous firing rates as early as 3 months, much before development of Aβ deposits in the brain. Furthermore, the frequencies but not amplitudes of MC inhibitory postsynaptic currents decreased markedly, suggesting that presynaptic GABA release is impaired while postsynaptic GABAA receptor responses remain intact. Notably, muscimol, a GABAA receptor agonist, improved odor identification and discrimination behaviors in APP/PS1 mice, reduced MC basal firing activity, and rescued inhibitory circuits along with reducing the Aβ burden in the OB. Our study links the presynaptic deficits of GABAergic transmission to olfactory dysfunction and subsequent AD development and implicates the therapeutic potential of maintaining local inhibitory microcircuits against early AD progression.
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