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Sustained IGF-1 Secretion by Adipose-Derived Stem Cells Improves Infarcted Heart Function.

Luiza L Bagno1, Deivid Carvalho, Fernanda Mesquita

  • 1Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Cell Transplantation
|December 2, 2015
PubMed
Summary

Overexpressing insulin-like growth factor-1 (IGF-1) in adipose-derived stem cells (ADSCs) enhanced cardiac function in a rat heart attack model. This gene and cell therapy approach shows promise for treating myocardial infarction (MI).

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Area of Science:

  • Regenerative Medicine
  • Cardiovascular Research
  • Stem Cell Biology

Background:

  • Stem cell therapy holds potential for treating heart conditions, with paracrine mechanisms being key.
  • Adipose-derived stem cells (ADSCs) secrete factors like insulin-like growth factor-1 (IGF-1) that may aid myocardial regeneration.

Purpose of the Study:

  • To investigate if overexpressing IGF-1 in ADSCs (IGF-1-ADSCs) improves the treatment of chronically infarcted rat hearts.
  • To assess the therapeutic efficacy of IGF-1-ADSCs in a rat myocardial infarction model.

Main Methods:

  • ADSCs were genetically modified using lentiviral vectors to overexpress IGF-1.
  • IGF-1-ADSCs were characterized for growth factor secretion and functional effects on cardiomyocytes.
  • IGF-1-ADSCs were transplanted into rats with chronic myocardial infarction, and cardiac function was evaluated.

Main Results:

  • IGF-1-ADSCs exhibited significantly higher IGF-1 mRNA levels and released more growth factors (IGF-1, VEGF, HGF) than control ADSCs.
  • IGF-1 secreted by IGF-1-ADSCs was functional, inducing Akt-1 phosphorylation in cardiomyocytes.
  • Treatment with IGF-1-ADSCs improved left ventricular ejection fraction and cardiac contractility index in infarcted rats compared to ADSCs alone.

Conclusions:

  • Transplantation of IGF-1-overexpressing ADSCs is a superior therapeutic strategy for myocardial infarction compared to unmodified ADSCs.
  • Gene and cell therapy combining IGF-1 overexpression with ADSCs offers enhanced benefits for treating heart damage.