Cholesterol transfer via endoplasmic reticulum contacts mediates lysosome damage repair

ABSTRACT: Lysosome integrity is essential for cell viability, and lesions in lysosome membranes are repaired by the ESCRT machinery. Here we describe an additional mechanism for lysosome repair that is activated independently of ESCRT recruitment. Lipidomic analyses showed increases in lysosomal phosphatidylserine and cholesterol after damage. Electron microscopy demonstrated that lysosomal membrane damage is rapidly followed by formation of contacts with the endoplasmic reticulum (ER), which depend on the ER proteins VAPA/B. The cholesterol-binding protein ORP1L was recruited to damaged lysosomes, accompanied by cholesterol accumulation by a mechanism that required VAP-ORP1L interactions. The PtdIns 4-kinase PI4K2A rapidly produced PtdIns4P on lysosomes upon damage, and knockout of PI4K2A inhibited

SUBMITTER: Dr. Maja Radulovic 

PROVIDER: S-SCDT-10_15252-EMBJ_2022112677 | biostudies-other |

REPOSITORIES: biostudies-other