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Monocyte telomere shortening and oxidative DNA damage in type 2 diabetes

Mike J Sampson1, Mark S Winterbone, Jackie C Hughes

  • 1Elsie Bertram Diabetes Centre, Norfolk and Norwich University Hospital National Health Service Trust, Norwich NR4 7UA, UK. mike.sampson@nnuh.nhs.uk

Diabetes Care
|January 31, 2006
PubMed
Abstract

Insights

Type 2 diabetes is linked to shorter telomeres in monocytes, potentially due to increased oxidative DNA damage. This cellular aging may contribute to vascular complications in diabetic patients.

Area of Science:

  • Cellular and Molecular Biology
  • Endocrinology
  • Gerontology

Background:

  • Telomeres, protective DNA caps, shorten with cell division and oxidative stress.
  • Replicative senescence, triggered by critically short telomeres, is a hallmark of aging.
  • Type 2 diabetes is associated with increased oxidative DNA damage, suggesting a potential link to telomere attrition.

Purpose of the Study:

  • To investigate whether telomere shortening characterizes type 2 diabetes.
  • To explore the relationship between telomere length, oxidative DNA damage, and metabolic markers in type 2 diabetes.

Main Methods:

  • Compared telomere length in monocytes and T-cells between 21 male type 2 diabetic subjects and 29 matched controls.
  • Measured oxidative DNA damage using flow cytometry.
  • Assessed peripheral insulin resistance and high-sensitivity C-reactive protein (hsCRP).

Main Results:

  • Monocyte telomere length was significantly shorter in diabetic subjects compared to controls (P < 0.0001).
  • No significant difference in lymphocyte telomere length was observed.
  • A significant inverse correlation between oxidative DNA damage and telomere length was found in diabetic individuals (r = -0.55; P = 0.018).

Conclusions:

  • Monocyte telomere shortening in type 2 diabetes may result from heightened oxidative DNA damage during cell division.
  • Shorter telomeres in monocytes may increase the risk of replicative senescence and vascular complications in type 2 diabetes.

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