Our understanding of stem cell biology, especially in regards to its use for therapeutic cardiovascular regeneration, has continued at a staggering pace. Over the past few years, the identification of endogenous cardiac stem cells has raised the exciting possibility of harnessing these cells for cardiac repair. Recently, our laboratory has observed the existence of a cardiac progenitor cell population. These so termed cardiac side-population (CSP) cells, identified in adult hearts by their distinct Hoechst dye efflux pattern, represent a distinct cardiac progenitor cell population, capable of both biochemical and, more importantly, functional cardiomyogenic differentiation through a process mediated by coupling with adult cardiomyocytes. Moreover, after myocardial infarction (Ml), CSP cells are acutely depleted, and are restored through self-renewal of endogenous CSP cells and homing of extra-cardiac bone marrow-derived side population (BMSP) stem cells. Following homing to the injured hearts, BMSP adopt an immunophenotype similar to endogenous CSP cells. As such, utilizing a multidisciplinary approach of in-vitro and in-vivo methodologies, the main goal of this proposal is to delineate the signaling pathways regulating the proliferation and differentiation of CSP cells. Additionally, we will determine the functional significance of BMSP cell homing to injured myocardium, with the ultimate goal of harnessing these adult stem cells for physiologically significant cardiac regeneration. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL086967-02
Application #
7474065
Study Section
Cardiovascular Differentiation and Development Study Section (CDD)
Program Officer
Adhikari, Bishow B
Project Start
2007-08-01
Project End
2012-07-31
Budget Start
2008-08-01
Budget End
2009-07-31
Support Year
2
Fiscal Year
2008
Total Cost
$430,000
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
030811269
City
Boston
State
MA
Country
United States
Zip Code
02115
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