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Bone marrow-derived hematopoietic cells generate cardiomyocytes at a low frequency through cell fusion, but not

Jens M Nygren1, Stefan Jovinge, Martin Breitbach

  • 1Hematopoietic Stem Cell Laboratory, Lund Strategic Research Center for Stem Cell Biology and Cell Therapy, Lund University, BMC B10, Klinikgatan 26, 221 84 Lund, Sweden.

Nature Medicine
|April 27, 2004
PubMed

Insights

Bone marrow cells can engraft in infarcted myocardium but are transient and hematopoietic. Cardiomyocytes in the heart after injury originate from cell fusion, not bone marrow transdifferentiation.

Area of Science:

  • Cardiovascular Biology
  • Stem Cell Biology
  • Regenerative Medicine

Background:

  • Bone marrow cells (BMCs) show potential for broader differentiation than previously thought.
  • Concerns exist regarding low efficiency and cell fusion in reported BMC plasticity.
  • The role of BMCs in regenerating cardiomyocytes after myocardial infarction (MI) requires detailed investigation.

Purpose of the Study:

  • To investigate the identity, longevity, and fate of BMCs in infarcted myocardium.
  • To determine if BMCs can regenerate cardiomyocytes via transdifferentiation after MI.
  • To clarify the mechanisms of BMC engraftment and contribution to cardiac repair.

Main Methods:

  • Induction of acute myocardial injury in animal models.
  • Delivery of transgenically marked BMCs to the injured myocardium.
  • Analysis of cell engraftment, differentiation, and origin using various techniques.

Main Results:

  • Unfractionated BMCs and hematopoietic stem and progenitor cells efficiently engraft in infarcted myocardium.
  • Engraftment of BMCs was transient and maintained a hematopoietic identity.
  • Bone marrow-derived cardiomyocytes were rarely observed and exclusively resulted from cell fusion.

Conclusions:

  • BMCs engraft transiently in infarcted myocardium but do not transdifferentiate into cardiomyocytes.
  • Observed bone marrow-derived cardiomyocytes are a product of cell fusion, not true transdifferentiation.
  • These findings impact the understanding of BMC potential in cardiac repair and clinical applications.

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