讲座主题:线粒体内膜的CALHM2孔道:细胞代谢调控新机制
专家姓名:王世强
工作单位:北京大学
讲座时间:2024年10月18日13:30-14:30
讲座地点:八角湾校区行政楼报告厅
主办单位:烟台大学生命科学学院
内容摘要:
The calcium homeostasis modulator (CALHM)-2 is a member of the CALHM gene family residing at 10q24.33 of human genome, but its function is yet unknown. We found that CALHM2 forms a mega channel in the inner membrane of mitochondria. CALHM2 channels are opened by ATP and closed by Ca2+. Opened CALHM2 channels are permeable to molecules like ATP and induce fluctuations of mitochondrial membrane potential. CALHM2 knockdown/knockout decreases cytosolic ATP concentration, and thereby compromises energy-sensitive processes, such as intracellular Ca2+ handling. However, CALHM2 loss-of-function elevates ATP concentration in the mitochondrial matrix, dephosphorylates key enzymes in the mammalian target of rapamycin (mTOR) pathway, and promotes longevity in CALHM2 knockout mice. These findings reveal that CALHM2 constitutes a novel regulator of mitochondrial metabolism, which may has important implications in aging and diseases.
主讲人介绍:
王世强,北京大学生命科学学院长江学者特聘教授,国家杰出青年科学基金获得者,国家“万人计划”领军人才。长期从事细胞钙信号转导研究,从分子间相互作用的角度阐明心肌细胞兴奋收缩耦联的分子机制,系统研究了心肌肥厚、心力衰竭、心律失常的心脏疾病条件下兴奋收缩耦联的结构和功能重塑,阐明其中钙信号、microRNA、相关蛋白及其启动子和转录因子的病理变化规律,提出治疗或逆转这些病理过程的新理论。先后承担“973”计划、“863”计划、国家重点研发计划,以及国家自然科学基金重点项目、重大研究计划等科研项目,系列重要成果发表于Nature、Circulation Research、PNAS等期刊,曾获北京市优秀教师、全国优秀科技工作者、国家级一流本科课程、教育部自然科学一等奖、国家自然科学二等奖、国务院政府特殊津贴等荣誉。