BRD4 Signaling Maintains the Differentiated State of β Cells

作者：Fuqiang Liu, Guang Liu, Jia Song, Yujing Sun, Mengmeng Yang, Hualin Liu, Hongkai Zhao, Jiamu Chen, Qincheng Qiao, Suo Li, Chenglong Yu, Jingru Qu, Ying Zou, Tixiao Wang, Jidong Liu, Lei Zhao, Huihui Tian, Tao Huang, Manna Zhang, Li Chen, Ruxing Zhao, Yuanyuan Du, Xinguo Hou · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202505659 · 被引用次数：3 · 研究领域：Pancreatic function and diabetes、Protein Degradation and Inhibitors、Genetics and Neurodevelopmental Disorders

In diabetes, pancreatic β cells degenerate from their mature differentiated state to a dedifferentiated state. BRD4 plays a pivotal role during embryogenesis and cancer development, but its function in modulating β-cell differentiation remains unknown. In this study, multiple models including calorie restriction db/db mouse, long-term and acute conditional knockout mouse, and human islet organoids are adopted to assess BRD4 function in β cells. Two hundred twenty-two young patients with diabetes are also recruited for whole exome sequencing (WES) to screen for BRD4 mutations. This study shows that BRD4 expression is significantly reduced in human diabetic β cells while significantly increased after calorie restriction in the diabetic mouse. β cell differentiation is impaired after long-term and acute Brd4 knockout. BRD4 knockdown in human islet organoids results in the loss of differentiation and reduction of insulin synthesis. It is found that p.R749C can significantly affect BRD4 signaling and might play roles in diabetes development in patients. This study also shows that ATF5 is a direct target of the BRD4 pathway in β cells. Targeting BRD4-mediated regulatory networks may hold promise for developing novel therapeutic strategies to maintain the differentiated state of β cells.