Pressure sensing of lysosomes enables control of TFEB responses in macrophages

Cai R, Scott O, Ye G, Le T, Saran E, Kwon W, Inpanathan S, Sayed BA, Botelho RJ, Saric A, Uderhardt S, Freeman SA (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Nature Cell Biology Nature Research

DOI: 10.1038/s41556-024-01459-y

Abstract

Polymers are endocytosed and hydrolysed by lysosomal enzymes to generate transportable solutes. While the transport of diverse organic solutes across the plasma membrane is well studied, their necessary ongoing efflux from the endocytic fluid into the cytosol is poorly appreciated by comparison. Myeloid cells that employ specialized types of endocytosis, that is, phagocytosis and macropinocytosis, are highly dependent on such transport pathways to prevent the build-up of hydrostatic pressure that otherwise offsets lysosomal dynamics including vesiculation, tubulation and fission. Without undergoing rupture, we found that lysosomes incurring this pressure owing to defects in solute efflux, are unable to retain luminal Na+, which collapses its gradient with the cytosol. This cation ‘leak’ is mediated by pressure-sensitive channels resident to lysosomes and leads to the inhibition of mTORC1, which is normally activated by Na+-coupled amino acid transporters driven by the Na+ gradient. As a consequence, the transcription factors TFEB/TFE3 are made active in macrophages with distended lysosomes. In addition to their role in lysosomal biogenesis, TFEB/TFE3 activation causes the release of MCP-1/CCL2. In catabolically stressed tissues, defects in efflux of solutes from the endocytic pathway leads to increased monocyte recruitment. Here we propose that macrophages respond to a pressure-sensing pathway on lysosomes to orchestrate lysosomal biogenesis as well as myeloid cell recruitment.

Authors with CRIS profile

Stefan Uderhardt Department of Medicine 3 – Rheumatology and Immunology

Involved external institutions

The Hospital for Sick Children (SickKids) CA Canada (CA) US National Institutes of Health (NIH) US United States (USA) (US) Toronto Metropolitan University / Ryerson University CA Canada (CA)

How to cite

APA:

Cai, R., Scott, O., Ye, G., Le, T., Saran, E., Kwon, W.,... Freeman, S.A. (2024). Pressure sensing of lysosomes enables control of TFEB responses in macrophages. Nature Cell Biology. https://doi.org/10.1038/s41556-024-01459-y

MLA:

Cai, Ruiqi, et al. "Pressure sensing of lysosomes enables control of TFEB responses in macrophages." Nature Cell Biology (2024).

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