Cited by 558Autophagy in Disease and TherapyCell death mechanisms and regulationUbiquitin and proteasome pathways

Induction of Autophagy during Extracellular Matrix Detachment Promotes Cell Survival

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Fung, Christopher, Lock, Rebecca, Gao, Sizhen, Salas, Eduardo, Debnath, Jayanta·2008·Molecular Biology of the Cell

Abstract

Autophagy has been proposed to promote cell death during lumen formation in three-dimensional mammary epithelial acini because numerous autophagic vacuoles are observed in the dying central cells during morphogenesis. Because these central cells die due to extracellular matrix (ECM) deprivation (anoikis), we have directly interrogated how matrix detachment regulates autophagy. Detachment induces autophagy in both nontumorigenic epithelial lines and in primary epithelial cells. RNA interference-mediated depletion of autophagy regulators (ATGs) inhibits detachment-induced autophagy, enhances apoptosis, and reduces clonogenic recovery after anoikis. Remarkably, matrix-detached cells still exhibit autophagy when apoptosis is blocked by Bcl-2 overexpression, and ATG depletion reduces the clonogenic survival of Bcl-2-expressing cells after detachment. Finally, stable reduction of ATG5 or ATG7 in MCF-10A acini enhances luminal apoptosis during morphogenesis and fails to elicit long-term luminal filling, even when combined with apoptotic inhibition mediated by Bcl-2 overexpression. Thus, autophagy promotes epithelial cell survival during anoikis, including detached cells harboring antiapoptotic lesions.

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Crossref · 10.1091/mbc.e07-10-1092

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  • Anoikis has been reported in the formation of the lumen during the development of various secretory glands such as mammary and salivary glands.

    “Anoikis, a form of apoptosis caused by inappropriate cell/ECM interactions, has been reported in the formation of the lumen during the development of various secretory glands such as mammary and salivary glands.[20,21]”

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Authors
Fung, C., Lock, R., Gao, S., Salas, E., & Debnath, J.
Affiliations
  • University of California, San Francisco (US)
  • Harvard University (US)
  • *Department of Pathology and
Venue
Molecular Biology of the Cell
Published
2008-03
Volume
19
Issue
3
Pages
797-806
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2039403501
Cited by
558
References
52
Citations by year
2026: 10 · 2025: 20 · 2024: 15 · 2023: 26 · 2022: 33 · 2021: 45 · 2020: 41 · 2019: 35 · 2018: 36 · 2017: 23 · 2016: 40 · 2015: 37 · 2014: 44 · 2013: 43 · 2012: 28
FWCI
9.86
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology of the Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Howard Hughes Medical Institute
  • American Association for Cancer Research
  • National Institutes of Health
  • Genentech
  • University of California, San Francisco
  • National Cancer Institute (K08CA098419)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
autophagy, anoikis, extracellular matrix detachment, lumen formation, epithelial morphogenesis, apoptosis, Bcl-2, ATG5, ATG7, clonogenic survival, autophagy-related genes, mammary tumor cells
MeSH terms
Autophagy-Related Protein 5, Autophagy-Related Protein 7, Animals, Autophagy, Cell Adhesion, Cell Line, Cell Survival, Dogs, Epidermal Growth Factor, Epithelial Cells, Extracellular Matrix, Fibroblasts, Humans, Microtubule-Associated Proteins, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Ubiquitin-Activating Enzymes, Mice, ErbB Receptors

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