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Aging hinders cell reprogramming, but blocking NF-κB activation and DOT1L can overcome this barrier. Inhibiting these factors in aged cells and progeroid mice shows promise for rejuvenation strategies.

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Area of Science:

  • Cellular reprogramming
  • Aging biology
  • Stem cell research

Background:

  • Cellular reprogramming to induced pluripotent stem cells (iPSCs) is hindered by aging.
  • Understanding age-associated barriers is crucial for improving reprogramming efficiency.

Purpose of the Study:

  • To investigate the regulatory mechanisms behind age-associated barriers in somatic cell reprogramming.
  • To identify therapeutic targets for enhancing iPSC generation in aged individuals and progeroid syndromes.

Main Methods:

  • Derivation of iPSCs from individuals with premature or physiological aging.
  • Analysis of NF-κB signaling pathway and DOT1L expression during reprogramming.
  • Genetic and pharmacological inhibition of NF-κB and DOT1L.
  • In vivo studies in progeroid mouse models.

Main Results:

  • NF-κB activation was identified as a key factor blocking iPSC generation in aged cells.
  • Age-associated NF-κB hyperactivation upregulates DOT1L, suppressing pluripotency and enhancing senescence.
  • Inhibition of NF-κB and DOT1L significantly improved reprogramming efficiency in aged and progeria patient fibroblasts.
  • DOT1L inhibition extended lifespan and ameliorated aging phenotypes in progeroid mice.

Conclusions:

  • NF-κB and DOT1L are critical molecular targets for overcoming age-related reprogramming barriers.
  • Targeting these pathways offers potential for developing novel rejuvenation strategies.