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The Roles of Bone Marrow-Derived Stem Cells in Coronary Collateral Growth Induced by Repetitive Ischemia

Molly Enrick1, Anurag Jamaiyar1, Vahagn Ohanyan1

  • 1Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA.

Cells
|January 21, 2023
PubMed

Insights

Bone marrow stem cells (BMSCs) promote coronary collateral growth in ischemic heart disease models. These cells are crucial for forming new blood vessels, improving heart function during ischemia.

Area of Science:

  • Cardiovascular Research
  • Regenerative Medicine
  • Stem Cell Biology

Background:

  • Ischemic heart diseases (IHD) have limited treatment options, with modest benefits from stem cell therapies.
  • Coronary collateral growth (CCG) offers a natural bypass for IHD, but its regulation and the role of endogenous stem cells are unclear.

Purpose of the Study:

  • To investigate the role of bone marrow stem cells (BMSCs) in regulating coronary collateral growth (CCG) in a rat model.
  • To determine if BMSCs contribute to vascular repair and improved cardiac function following ischemic events.

Main Methods:

  • Utilized a bone marrow transplantation model in GFP-transgenic rats to trace BMSCs.
  • Induced repetitive ischemia (RI) in recipient rats and assessed cardiac function and blood flow via echocardiography.
  • Analyzed BMSC homing, proliferation, differentiation, and engraftment in heart tissues using flow cytometry and imaging.

Main Results:

  • BMSCs migrated to the collateral-dependent zone of the heart upon ischemic stimulation.
  • Transplanted BMSCs differentiated into endothelial cells, contributing to collateral growth and improving coronary blood flow and cardiac function.
  • Depletion of CD34+ BMSCs significantly impaired CCG, highlighting their essential role.

Conclusions:

  • BMSCs play a critical role in promoting coronary collateral growth in response to ischemia.
  • Targeting BMSC function represents a potential therapeutic strategy for treating ischemic heart diseases.

Keywords:
bone marrow stem cellscoronary blood flowcoronary collateral growthcoronary microcirculationrepetitive ischemia

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