Referenced in: none

Automatically associated channels: Slo1

Title: Lysosomal calcium signalling regulates autophagy through calcineurin and ​TFEB.

Authors: Diego L Medina, Simone Di Paola, Ivana Peluso, Andrea Armani, Diego De Stefani, Rossella Venditti, Sandro Montefusco, Anna Scotto-Rosato, Carolina Prezioso, Alison Forrester, Carmine Settembre, Wuyang Wang, Qiong Gao, Haoxing Xu, Marco Sandri, Rosario Rizzuto, Maria Antonietta De Matteis, Andrea Ballabio

Journal, date & volume: Nat. Cell Biol., 2015 Mar , 17, 288-99

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/25720963

Abstract
The view of the lysosome as the terminal end of cellular catabolic pathways has been challenged by recent studies showing a central role of this organelle in the control of cell function. Here we show that a lysosomal Ca2+ signalling mechanism controls the activities of the phosphatase calcineurin and of its substrate ​TFEB, a master transcriptional regulator of lysosomal biogenesis and autophagy. Lysosomal Ca2+ release through ​mucolipin 1 (​MCOLN1) activates calcineurin, which binds and dephosphorylates ​TFEB, thus promoting its nuclear translocation. Genetic and pharmacological inhibition of calcineurin suppressed ​TFEB activity during starvation and physical exercise, while calcineurin overexpression and constitutive activation had the opposite effect. Induction of autophagy and lysosomal biogenesis through ​TFEB required ​MCOLN1-mediated calcineurin activation. These data link lysosomal calcium signalling to both calcineurin regulation and autophagy induction and identify the lysosome as a hub for the signalling pathways that regulate cellular homeostasis.