Cited by 168Autophagy in Disease and TherapyCell death mechanisms and regulationCytokine Signaling Pathways and Interactions

Stat3 controls cell death during mammary gland involution by regulating uptake of milk fat globules and lysosomal membrane permeabilization

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Sargeant, Timothy J., Lloyd-Lewis, Bethan, Resemann, Henrike K., Ramos-Montoya, Antonio, Skepper, Jeremy, Watson, Christine J.·2014·Nature Cell Biology

Abstract

We have previously demonstrated that Stat3 regulates lysosomal-mediated programmed cell death (LM-PCD) during mouse mammary gland involution in vivo. However, the mechanism that controls the release of lysosomal cathepsins to initiate cell death in this context has not been elucidated. We show here that Stat3 regulates the formation of large lysosomal vacuoles that contain triglyceride. Furthermore, we demonstrate that milk fat globules (MFGs) are toxic to epithelial cells and that, when applied to purified lysosomes, the MFG hydrolysate oleic acid potently induces lysosomal leakiness. Additionally, uptake of secreted MFGs coated in butyrophilin 1A1 is diminished in Stat3-ablated mammary glands and loss of the phagocytosis bridging molecule MFG-E8 results in reduced leakage of cathepsins in vivo. We propose that Stat3 regulates LM-PCD in mouse mammary gland by switching cellular function from secretion to uptake of MFGs. Thereafter, perturbation of lysosomal vesicle membranes by high levels of free fatty acids results in controlled leakage of cathepsins culminating in cell death.

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  • STAT3 promotes lysosome-dependent cell death during mammary gland involution post-lactation by upregulating CTSB and CTSL and downregulating SPI2A.

    “Moreover, STAT3 reportedly promotes lysosome-dependent cell death during the involution of mammary gland post-lactation as it upregulates the expression of cathepsin B (CTSB) and CTSL, while downregulating their endogenous inhibitor serine (or cysteine) peptidase inhibitor, clade A, member 3G (SERPINA3G; best known as SPI2A) [774, 775].”

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Authors
Sargeant, T. J., Lloyd-Lewis, B., Resemann, H. K., Ramos-Montoya, A., Skepper, J., & Watson, C. J.
Affiliations
University of Cambridge (GB)
Corresponding author
Watson, Christine J.
Venue
Nature Cell Biology
Published
2014-10-05
Volume
16
Issue
11
Pages
1057-1068
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W2022167776
Cited by
168
References
60
Citations by year
2026: 8 · 2025: 17 · 2024: 9 · 2023: 14 · 2022: 21 · 2021: 12 · 2020: 24 · 2019: 14 · 2018: 20 · 2017: 4 · 2016: 13 · 2015: 10 · 2014: 2
FWCI
7.32
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Apollo (University of Cambridge) (acceptedVersion)
  • Explore Bristol Research (submittedVersion)
Funders
  • Cancer Research UK
  • Medical Research Council (MR/J001023/1)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
Keywords
STAT3, mammary gland involution, lysosomal membrane permeabilization, milk fat globules, oleic acid, cathepsins, MFG-E8, phagocytosis, triglyceride uptake, mammary epithelial cells, free fatty acids
MeSH terms
Animals, Biological Transport, Cathepsins, Epithelial Cells, Female, Glycolipids, Glycoproteins, Lysosomes, Mammary Glands, Animal, Mice, Inbred C57BL, Mice, Transgenic, Phagocytosis, Cell Death, Apoptosis, Mice, Knockout, STAT3 Transcription Factor, Lipid Droplets

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