Niacin exacerbates β cell lipotoxicity in diet-induced obesity mice through upregulation of GPR109A and PPARγ2: Inhibition by incretin drugs - Xiaojing Zhang; Baoyi Zhu; Peibin Lin; Xiaoping Liu; Jun Gao; Dazhong Yin; Jianwen Zeng; Baojian Liao; Zhanfang Kang (Frontiers in Endocrinology, 2022)