Fei Li, Yifan Zhang, Zhoujun Lin, Lizhong Yan, Qiao Liu, Yin Li, Xiaolin Pei, Ya Feng, Xiao Han, Juan Yang, Fangxu Zheng, Tianjiao Li, Yupeng Zhang, Zhenkun Fu, Di Shao, Jane Yu, Chenggang Li
Lymphangioleiomyomatosis (LAM), a progressive pulmonary disease exclusively affecting females, is caused by defects or mutations in the coding gene tuberous sclerosis complex 1 (TSC1) or TSC2, causing the mammalian target of rapamycin complex 1 (mTORC1) activation and autophagy inhibition. Clinically, rapamycin shows limited cytocidal effects, and LAM recurs after drug withdrawal. In this study, we demonstrated that TSC2 negatively regulated the sphingolipid metabolism pathway and the expressions of sphingosine kinase 1 (SPHK1) and sphingosine-1-phosphate receptor 3 (S1PR3) were significantly elevated in LAM patient-derived TSC2-deficient cells compared to TSC2-addback cells, insensitive to rapamycin treatment and estrogen stimulation...
December 21, 2022: Cell Death & Disease