Year: 2026
Type: preprint
Abstract: Microglia play essential roles in maintaining energy homeostasis, and their dysfunction contributes to metabolic disease. Although high-fat diet (HFD) exposure induces microglial activation, the underlying mechanisms remain poorly defined. Here, we identified a previously unrecognized role for THIK-1 channel in mediating glucose sensing of microglia in arcuate nucleus of the hypothalamus (ARH), during HFD-induced obesity. Pharmacological inhibition of THIK-1 channel with tetrapentylammonium (TPA) suppresses feeding and attenuates body-weight gain in diet induced obese mice. Mechanistically, inhibition of agouti-related peptide (AgRP) neurons is indispensable for TPA-induced hypophagia. Moreover, THIK-1 inhibition promotes microglial phagocytosis of perineuronal nets (PNNs), leading to reduced AgRP neuronal activity and feeding suppression. Together, these findings establish THIK-1 as a critical glucose sensor in hypothalamic microglia and uncover a microglia-dependent pathway through which overnutrition modulates AgRP neuronal activity via PNN remodeling to regulate energy balance, highlighting THIK-1 as a potential therapeutic target for treatment of diet-induced obesity.
Authors: Qingzhuo Liu, Jonathan C. Bean, Jinjing Jian, Tong Zhou, Yuxue Yang, Meixin Sun, Yongxiang Li, Kristine M. Conde, Mengjie Wang, Yue Deng, Jiamin Qiu, Fuhui Wang, Xinming Liu, Yutian Liu, Jingjing Cheng, Xi Wu, Lamei Xue, Chunling Chen, Chenling Meng, Yi Zhu, Yongjie Yang, Longlong Tu, Hailan Liu, Yong Xu
Language: English
Subfield: Endocrine and Autonomic Systems
Field: Neuroscience
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W7124432895