Human myocardial pericytes: multipotent mesodermal precursors exhibiting cardiac specificity

Area of Science:

• Cardiovascular Biology
• Stem Cell Biology
• Regenerative Medicine

Background:

• Perivascular mesenchymal precursor cells (pericytes) aid skeletal muscle regeneration.
• The presence and function of cardiac pericytes as regenerative precursors remain largely undocumented.

Purpose of the Study:

• To investigate if human heart pericytes (hHPs) exhibit similar phenotypes and multipotency to other pericyte types.
• To characterize the differentiation potential and functional properties of hHPs.

Main Methods:

• Prospective purification of hHPs from human myocardium via flow cytometry using specific cell surface markers.
• In vitro expansion and characterization of hHPs for mesenchymal stem/stromal cell marker expression and differentiation potential (osteogenesis, chondrogenesis, adipogenesis).
• Assessment of hHPs' angiogenic capacity and cardiomyogenic potential through in vitro assays and in vivo transplantation.

Main Results:

• Purified hHPs expressed canonical pericyte markers and mesenchymal stem/stromal cell markers.
• hHPs demonstrated osteo-, chondro-, and adipogenic potential but lacked skeletal myogenesis capacity.
• hHPs supported endothelial cell network formation, stimulated angiogenesis under hypoxia, and showed limited cardiomyocytic differentiation.

Conclusions:

• Human myocardial pericytes share some similarities with skeletal muscle pericytes but possess unique antigenic, myogenic, and angiogenic properties.
• This study presents the first evidence of anatomical restriction in the developmental potential of pericytes as native mesenchymal stem cells.
• Findings highlight distinct functional roles of pericytes based on their anatomical location.