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Somatic to iPS Cell Reprogramming01:29

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MiR-31/SDHA Axis Regulates Reprogramming Efficiency through Mitochondrial Metabolism.

Man Ryul Lee1, Charlie Mantel2, Sang A Lee3

  • 1Department of Microbiology and Immunology, Indiana University School of Medicine, 950 West Walnut Street, Indianapolis, IN 46202-5181, USA; Soonchunhyang Institute of Medi-bio Science, Institute of Tissue Regeneration, Soon Chun Hyang University, Asan-si, 31151 Chungcheongnam-do, Republic of Korea.

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Metabolic reprogramming, shifting from mitochondrial respiration to glycolysis, is crucial for induced pluripotent stem cell (iPSC) generation. The miR-31/SDHA pathway regulates this metabolic shift, lowering the reprogramming threshold.

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Area of Science:

  • Cell Biology
  • Stem Cell Biology
  • Metabolic Regulation

Background:

  • Somatic cell reprogramming into induced pluripotent stem cells (iPSCs) involves significant metabolic changes.
  • iPSCs preferentially utilize anaerobic glycolysis over mitochondrial respiration for energy.
  • Full reprogramming efficiency remains a challenge, necessitating a deeper understanding of metabolic remodeling.

Purpose of the Study:

  • To investigate the role of microRNA 31 (miR-31) in regulating the metabolic shift during iPSC reprogramming.
  • To determine the impact of the miR-31/SDHA axis on mitochondrial function and reprogramming efficiency.
  • To elucidate the contribution of metabolic remodeling to the multi-stage iPSC reprogramming process.

Main Methods:

  • Overexpression of miR-31 in partially reprogrammed iPSCs.
  • Measurement of succinate dehydrogenase complex subunit A (SDHA) expression levels.
  • Assessment of oxygen consumption rates (OCR) to evaluate mitochondrial respiration.
  • Co-transduction of miR-31 with Yamanaka factors to assess reprogramming efficiency.

Main Results:

  • MiR-31 overexpression suppressed SDHA expression and reduced oxygen consumption rates in iPSCs.
  • These metabolic changes mimicked those observed in fully reprogrammed iPSCs.
  • Co-delivery of miR-31 with Yamanaka factors significantly increased the efficiency of full iPSC reprogramming by 2.7-fold.
  • The miR-31/SDHA pathway was identified as a key regulator of metabolic adaptation during reprogramming.

Conclusions:

  • Metabolic remodeling, specifically the shift towards glycolysis via the miR-31/SDHA axis, is critical for efficient iPSC reprogramming.
  • Targeting this metabolic pathway can lower the reprogramming threshold and enhance the generation of fully reprogrammed iPSCs.
  • Metabolic adaptation is a fundamental and essential component of the multi-stage iPSC reprogramming process.