Cited by 351Pancreatic function and diabetesTelomeres, Telomerase, and SenescenceDiabetes Treatment and Management

p16Ink4a-induced senescence of pancreatic beta cells enhances insulin secretion

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Helman, Aharon, Klochendler, Agnes, Azazmeh, Narmen, Gabai, Yael, Horwitz, Elad, Anzi, Shira, Swisa, Avital, Condiotti, Reba +13 more·2016·Nature Medicine

Abstract

Cellular senescence is thought to contribute to age-associated deterioration of tissue physiology. The senescence effector p16(Ink4a) is expressed in pancreatic beta cells during aging and limits their proliferative potential; however, its effects on beta cell function are poorly characterized. We found that beta cell-specific activation of p16(Ink4a) in transgenic mice enhances glucose-stimulated insulin secretion (GSIS). In mice with diabetes, this leads to improved glucose homeostasis, providing an unexpected functional benefit. Expression of p16(Ink4a) in beta cells induces hallmarks of senescence--including cell enlargement, and greater glucose uptake and mitochondrial activity--which promote increased insulin secretion. GSIS increases during the normal aging of mice and is driven by elevated p16(Ink4a) activity. We found that islets from human adults contain p16(Ink4a)-expressing senescent beta cells and that senescence induced by p16(Ink4a) in a human beta cell line increases insulin secretion in a manner dependent, in part, on the activity of the mechanistic target of rapamycin (mTOR) and the peroxisome proliferator-activated receptor (PPAR)-γ proteins. Our findings reveal a novel role for p16(Ink4a) and cellular senescence in promoting insulin secretion by beta cells and in regulating normal functional tissue maturation with age.

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  • p16Ink4a-induced senescent beta cells show increased insulin secretion rather than reduced insulin secretion.

    “a surprising finding was that, rather than being reduced, insulin secretion was actually increased in p16Ink4a-induced senescent cells [38].”
  • In humans, accumulation of senescent markers has been demonstrated in skin, T lymphocytes, atherosclerotic lesions, insulin-producing β cells, kidney, endothelium, visceral fat, joint cartilage, cardiac muscle, liver, and many other tissues.

    “In humans, the accumulation of senescent markers has been demonstrated in the skin, T lymphocytes, atherosclerotic lesions, insulin-producing β cells, kidney, endothelium, visceral fat, joint cartilage, cardiac muscle, liver, and many others tissues98,101–107.”
  • p16-induced senescence of mouse and human pancreatic beta cells promotes insulin secretion.

    “p16Ink4a (encoded by the INK4a/ARF locus, also known as CDKN2a, hereafter referred to as p16)-induced senescence of mouse and human pancreatic beta cells also promotes insulin secretion [10].”

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Authors
Helman, A., Klochendler, A., Azazmeh, N., Gabai, Y., Horwitz, E., Anzi, S., Swisa, A., Condiotti, R., Granit, R. Z., Nevo, Y., Fixler, Y., Shreibman, D., Zamir, A., Tornovsky-Babeay, S., Dai, C., Glaser, B., Powers, A. C., Shapiro, A. M. J., Magnuson, M. A., Dor, Y., & Ben-Porath, I.
Affiliations
  • Hebrew University of Jerusalem (IL)
  • Vanderbilt University Medical Center (US)
  • Vanderbilt University (US)
  • University of Alberta (CA)
Corresponding author
Dor, Yuval
Venue
Nature Medicine
Published
2016-03-07
Volume
22
Issue
4
Pages
412-420
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2295694318
Cited by
351
References
66
Citations by year
2026: 22 · 2025: 39 · 2024: 38 · 2023: 39 · 2022: 33 · 2021: 46 · 2020: 36 · 2019: 29 · 2018: 25 · 2017: 30 · 2016: 13
FWCI
35.82
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (5p60dk020593-31)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK089572, P60-DK020593, U01DK089572, DK-72473, DK104211, DK 20593, UC4DK104211, R24DK106755, U01DK072473, P30DK020593)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
p16INK4a, cellular senescence, pancreatic beta cells, insulin secretion, glucose-stimulated insulin secretion, glucose homeostasis, mTOR, PPARγ, beta-cell proliferation, diabetes mellitus, islets
MeSH terms
Insulin Secretion, Aging, Animals, Fibroblasts, Gene Expression Regulation, Glucose, Humans, Insulin, Mice, Transgenic, Cellular Senescence, Cyclin-Dependent Kinase Inhibitor p16, PPAR gamma, Cell Proliferation, Insulin-Secreting Cells, Mice, TOR Serine-Threonine Kinases

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