Cited by 591Cellular transport and secretionAutophagy in Disease and TherapyCalcium signaling and nucleotide metabolism

The DOI matches its Crossref record; 73 of the 73 references it cites were found in a registry or an index.

The position of lysosomes within the cell determines their luminal pH

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Abstract

We examined the luminal pH of individual lysosomes using quantitative ratiometric fluorescence microscopy and report an unappreciated heterogeneity: peripheral lysosomes are less acidic than juxtanuclear ones despite their comparable buffering capacity. An increased passive (leak) permeability to protons, together with reduced vacuolar H(+)-adenosine triphosphatase (V-ATPase) activity, accounts for the reduced acidifying ability of peripheral lysosomes. The altered composition of peripheral lysosomes is due, at least in part, to more limited access to material exported by the biosynthetic pathway. The balance between Rab7 and Arl8b determines the subcellular localization of lysosomes; more peripheral lysosomes have reduced Rab7 density. This in turn results in decreased recruitment of Rab-interacting lysosomal protein (RILP), an effector that regulates the recruitment and stability of the V1G1 component of the lysosomal V-ATPase. Deliberate margination of lysosomes is associated with reduced acidification and impaired proteolytic activity. The heterogeneity in lysosomal pH may be an indication of a broader functional versatility.

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Metadata

Authors
Johnson, D. E., Ostrowski, P., Jaumouillé, V., & Grinstein, S.
Affiliations
Hospital for Sick Children (CA)
Corresponding author
Grinstein, Sergio
Venue
Journal of Cell Biology
Published
2016-03-14
Volume
212
Issue
6
Pages
677-692
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2322556561
Cited by
590
References
73
Citations by year
2026: 49 · 2025: 60 · 2024: 57 · 2023: 64 · 2022: 71 · 2021: 61 · 2020: 66 · 2019: 52 · 2018: 49 · 2017: 38 · 2016: 23
FWCI
37.10
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • Hospital for Sick Children
  • Canadian Institutes of Health Research (FDN-143202)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
lysosomal pH, lysosomal acidification, V-ATPase, Rab7, Arl8b, RILP, lysosomal proteolysis
MeSH terms
rab7 GTP-Binding Proteins, HeLa Cells, Humans, Hydrogen-Ion Concentration, Lysosomes, Vacuoles, rab GTP-Binding Proteins, ADP-Ribosylation Factors, Vacuolar Proton-Translocating ATPases, Cell Line, Tumor, Adaptor Proteins, Signal Transducing, Biosynthetic Pathways

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