Cited by 138Cellular transport and secretionEndoplasmic Reticulum Stress and DiseaseIon Channels and Receptors

Adaptation of endoplasmic reticulum exit sites to acute and chronic increases in cargo load

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Farhan, Hesso, Weiss, Matthias, Tani, Katsuko, Kaufman, Randal J, Hauri, Hans‐Peter·2008·The EMBO Journal

Abstract

The biogenesis of endoplasmic reticulum (ER) exit sites (ERES) involves the formation of phosphatidylinositol-4 phosphate (PI4) and Sec16, but it is entirely unknown how ERES adapt to variations in cargo load. Here, we studied acute and chronic adaptive responses of ERES to an increase in cargo load for ER export. The acute response (within minutes) to increased cargo load stimulated ERES fusion events, leading to larger but less ERES. Silencing either PI4-kinase IIIalpha (PI4K-IIIalpha) or Sec16 inhibited the acute response. Overexpression of secretory cargo for 24 h induced the unfolded protein response (UPR), upregulated COPII, and the cells formed more ERES. This chronic response was insensitive to silencing PI4K-IIIalpha, but was abrogated by silencing Sec16. The UPR was required as the chronic response was absent in cells lacking inositol-requiring protein 1. Mathematical model simulations further support the notion that increasing ERES number together with COPII levels is an efficient way to enhance the secretory flux. These results indicate that chronic and acute increases in cargo load are handled differentially by ERES and are regulated by different factors.

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Crossref · 10.1038/emboj.2008.136

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  • The recruitment of ERES depends directly on ER export efficiency.

    “Our observation that ERES numbers increase—even without nicotine—for enhanced ER export of nAChRs shows that the recruitment of ERES depends directly on ER export efficiency and extends previous observations that simple coexpression of membrane proteins can enhance ERES number (Farhan et al., 2008).”

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Authors
Farhan, H., Weiss, M., Tani, K., Kaufman, R. J., & Hauri, H.
Affiliations
  • University of Basel (CH)
  • German Cancer Research Center (DE)
  • Tokyo University of Pharmacy and Life Sciences (JP)
  • Howard Hughes Medical Institute (US)
Corresponding author
Hauri, Hans‐Peter
Venue
The EMBO Journal
Published
2008-07-24
Volume
27
Issue
15
Pages
2043-2054
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2163308914
Cited by
138
References
35
Citations by year
2026: 3 · 2025: 5 · 2024: 9 · 2023: 9 · 2022: 8 · 2021: 10 · 2020: 4 · 2019: 7 · 2018: 8 · 2017: 7 · 2016: 8 · 2015: 7 · 2014: 6 · 2013: 12 · 2012: 10
FWCI
3.65
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
Funders
  • National Science Foundation
  • Howard Hughes Medical Institute
  • Yale University
  • Universität Basel
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Austrian Science Fund
  • Universität Wien
  • Medizinische Universität Wien
  • National Institutes of Health (HL052173, DK042394)
  • National Heart, Lung, and Blood Institute (R01HL052173, P01HL057346)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK042394, R37DK042394)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
endoplasmic reticulum exit sites, cargo load, phosphatidylinositol 4-phosphate, Sec16, PI4KIIIα, unfolded protein response, COPII, mathematical modeling, ER export
MeSH terms
Endoplasmic Reticulum, Golgi Apparatus, HeLa Cells, Humans, Intracellular Membranes, Models, Biological, Signal Transduction, Minor Histocompatibility Antigens, Protein Folding, Phosphotransferases (Alcohol Group Acceptor), Phosphatidylinositol Phosphates, Protein Transport, Secretory Vesicles, COP-Coated Vesicles, Vesicular Transport Proteins

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