Cited by 100Pancreatic function and diabetesTelomeres, Telomerase, and SenescenceDiabetes and associated disorders

Short Telomeres Compromise β-Cell Signaling and Survival

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Guo, Nini, Parry, Erin M., Li, Luo-Sheng, Kembou, Frant, Lauder, Naudia, Hussain, Mehboob A., Berggren, Per-Olof, Armanios, Mary·2011·PLoS ONE

Abstract

The genetic factors that underlie the increasing incidence of diabetes with age are poorly understood. We examined whether telomere length, which is inherited and known to shorten with age, plays a role in the age-dependent increased incidence of diabetes. We show that in mice with short telomeres, insulin secretion is impaired and leads to glucose intolerance despite the presence of an intact β-cell mass. In ex vivo studies, short telomeres induced cell-autonomous defects in β-cells including reduced mitochondrial membrane hyperpolarization and Ca(2+) influx which limited insulin release. To examine the mechanism, we looked for evidence of apoptosis but found no baseline increase in β-cells with short telomeres. However, there was evidence of all the hallmarks of senescence including slower proliferation of β-cells and accumulation of p16(INK4a). Specifically, we identified gene expression changes in pathways which are essential for Ca(2+)-mediated exocytosis. We also show that telomere length is additive to the damaging effect of endoplasmic reticulum stress which occurs in the late stages of type 2 diabetes. This additive effect manifests as more severe hyperglycemia in Akita mice with short telomeres which had a profound loss of β-cell mass and increased β-cell apoptosis. Our data indicate that short telomeres can affect β-cell metabolism even in the presence of intact β-cell number, thus identifying a novel mechanism of telomere-mediated disease. They implicate telomere length as a determinant of β-cell function and diabetes pathogenesis.

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  • Telomere-induced senescence acts mainly through p53-dependent pathways, though the RB pathway may also be involved in some contexts.

    “The downstream effector pathways of telomere-induced senescence are largely p53-dependent96, but there may be involvement of the retinoblastoma protein (RB) pathway in some settings97.”

    From The telomere syndromes (2012) · cites this paper as [97]

  • Telomere dysfunction produces notable phenotypes in tissues that divide slowly.

    “more recently it has been recognized that telomere dysfunction causes prominent phenotypes in slow-turnover tissues97,99,100,103 (Table 2).”

    From The telomere syndromes (2012) · cites this paper as [97]

  • The telomerase-knockout mouse is a valuable model for studying telomere-mediated disease mechanisms because its phenotypes closely match those in humans.

    “The telomerase-knockout mouse has provided an important model for understanding telomere-mediated disease mechanisms because there is a remarkable convergence with human disease phenotypes (an overview is shown in Table 2)36,82,84,85,97,99–111.”

    From The telomere syndromes (2012) · cites this paper as [97]

  • Altered gene expression in these cells disrupts pathways needed for insulin secretion signalling and exocytosis, such as mitochondrial function and calcium handling.

    “The dysregulation of gene expression affects pathways that are essential for insulin secretion signalling and exocytosis, including mitochondrial function and Ca2+ handling97.”

    From The telomere syndromes (2012) · cites this paper as [97]

  • In mice, short telomeres reduce the threshold for disease from additional external or internal insults, including γ-irradiation and ER stress from misfolded proteins.

    “Indeed, in mouse models, short telomeres have been shown to lower the disease threshold to other exogenous and endogeneous damage, such as γ-irradiation119 and endoplasmic reticulum stress due to protein misfolding97 (Fig. 5a).”

    From The telomere syndromes (2012) · cites this paper as [97]

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  1. [13]Armanios M Chen JL Chang YP Brodsky RA Hawkins A 2005 Haploinsufficiency of telomerase reverse transcriptase leads to anticipation in autosomal dominant dyskeratosis congenita. Proc Natl Acad Sci U S A 102 15960 15964 16247010 PMC1276104

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Authors
Guo, N., Parry, E. M., Li, L.-S., Kembou, F., Lauder, N., Hussain, M. A., Berggren, P.-O., & Armanios, M.
Affiliations
  • Johns Hopkins University (US)
  • Karolinska Institutet (SE)
Corresponding author
Armanios, Mary
Venue
PLoS ONE
Published
2011-03-10
Volume
6
Issue
3
Pages
e17858
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1994225766
Cited by
100
References
51
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 9 · 2022: 9 · 2021: 7 · 2020: 2 · 2019: 8 · 2018: 4 · 2017: 9 · 2016: 9 · 2015: 8 · 2014: 7 · 2013: 7 · 2012: 9
FWCI
8.50
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • Vetenskapsrådet
  • National Institutes of Health
  • National Institute on Aging (AG27406, R01AG027406)
  • National Cancer Institute (CA118416, K08CA118416)
  • National Institute of General Medical Sciences (T32GM007309, GM007309)
  • National Institute of Diabetes and Digestive and Kidney Diseases (T32DK007632)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
telomere length, short telomeres, pancreatic beta cells, insulin secretion, type 2 diabetes, aging, cellular senescence, p16INK4a, endoplasmic reticulum stress, calcium influx, mitochondrial membrane potential, exocytosis, beta-cell apoptosis, Akita mice, impaired glucose tolerance
MeSH terms
Insulin Secretion, Animals, Cell Survival, Diabetes Mellitus, Endoplasmic Reticulum, Gene Expression Regulation, Glucose, Glucose Tolerance Test, Humans, Insulin, Mitochondria, Stress, Physiological, Signal Transduction, Incidence, Telomere, Cellular Senescence, Dyskeratosis Congenita, Calcium Signaling, Insulin-Secreting Cells, Mice

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