Reprogrammed keratinocytes from elderly type 2 diabetes patients suppress senescence genes to acquire induced pluripotency

Aging (Albany NY). 2012 Jan;4(1):60-73. doi: 10.18632/aging.100428.

Abstract

Nuclear reprogramming enables patient-specific derivation of induced pluripotent stem (iPS) cells from adult tissue. Yet, iPS generation from patients with type 2 diabetes (T2D) has not been demonstrated. Here, we report reproducible iPS derivation of epidermal keratinocytes (HK) from elderly T2D patients. Transduced with human OCT4, SOX2, KLF4 and c-MYC stemness factors under serum-free and feeder-free conditions, reprogrammed cells underwent dedifferentiation with mitochondrial restructuring, induction of endogenous pluripotency genes - including NANOG, LIN28, and TERT, and down-regulation of cytoskeletal, MHC class I- and apoptosis-related genes. Notably, derived iPS clones acquired a rejuvenated state, characterized by elongated telomeres and suppressed senescence-related p15INK4b/p16INK4a gene expression and oxidative stress signaling. Stepwise guidance with lineage-specifying factors, including Indolactam V and GLP-1, redifferentiated HK-derived iPS clones into insulin-producing islet-like progeny. Thus, in elderly T2D patients, reprogramming of keratinocytes ensures a senescence-privileged status yielding iPS cells proficient for regenerative applications.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aging / genetics*
  • Cell Culture Techniques
  • Diabetes Mellitus, Type 2 / metabolism*
  • Gene Expression Profiling
  • Gene Expression Regulation / physiology*
  • Genome
  • Humans
  • Insulin / metabolism
  • Keratinocytes / cytology*
  • Keratinocytes / physiology*
  • Kruppel-Like Factor 4
  • Middle Aged
  • Mitochondria / metabolism
  • Oxidative Stress
  • Pluripotent Stem Cells / metabolism*
  • Signal Transduction

Substances

  • Insulin
  • KLF4 protein, human
  • Kruppel-Like Factor 4