LRRK 2 activation controls the repair of damaged endomembranes in macrophages

• DOI: 10.15252/embj.2020104494
• Publication Date: 2020-07-09T15:59:06Z
• Authors: Susanne Herbst; Philip Campbell; John Harvey; Elliott M Bernard; Venizelos Papayan...; Nicholas W Wood; Huw R Morris; Maximiliano G Gut...
• Keywords: 0301 basic medicine; Endosomal Sorting Complexes Required for Transport; Parkinson's disease; Macrophages; endolysosomal damage; LRRK2; Parkinson Disease; Articles; Endosomes; Intracellular Membranes; Leucine-Rich Repeat Serine-Threonine Protein Kinase-2; Enzyme Activation; Mice; 03 medical and health sciences; lysosomes; RAW 264.7 Cells; tuberculosis; rab GTP-Binding Proteins; Animals; Humans; Lysosomes

Cells respond to endolysosome damage by either repairing the damage or targeting damaged endolysosomes for degradation via lysophagy. However, the signals regulating the decision for repair or lysophagy are poorly characterised. Here, we show that the Parkinson's disease (PD)-related kinase LRRK2 is activated in macrophages by pathogen- or sterile-induced endomembrane damage. LRRK2 recruits the Rab GTPase Rab8A to damaged endolysosomes as well as the ESCRT-III component CHMP4B, thereby favouring ESCRT-mediated repair. Conversely, in the absence of LRRK2 and Rab8A, damaged endolysosomes are targeted to lysophagy. These observations are recapitulated in macrophages from PD patients where pathogenic LRRK2 gain-of-function mutations result in the accumulation of endolysosomes which are positive for the membrane damage marker Galectin-3. Altogether, this work indicates that LRRK2 regulates endolysosomal homeostasis by controlling the balance between membrane repair and organelle replacement, uncovering an unexpected function for LRRK2, and providing a new link between membrane damage and PD.