Published online before print June 2, 2008, doi: 10.1161/CIRCRESAHA.107.169334
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Submitted on December 4, 2007
Revised on May 19, 2008
Accepted on May 21, 2008
Myocardial Induction of Nucleostemin in Response to Postnatal Growth and Pathological Challenge
Sailay Siddiqi ;
From the San Diego State University Heart Institute and Department of Biology (S.S., N.G., J.M., M.R., G.E., J.F., M.S.), San Diego State University, Calif; Departments of Anesthesia and Medicine and Division of Cardiology (T.H., S.V., C.P., D.D'A., J.K., A.L., P.A.), Brigham and Women's Hospital, Harvard Medical School, Boston, Mass; and Biosource International (E.S.), Hopkinton, Mass.
* To whom correspondence should be addressed. E-mail: sussman{at}heart.sdsu.edu.
Stem cell–specific proteins and regulatory pathways that determine self-renewal and differentiation have become of fundamental importance in understanding regenerative and reparative processes in the myocardium. One such regulatory protein, named nucleostemin, has been studied in the context of stem cells and several cancer cell lines, where expression is associated with proliferation and maintenance of a primitive cellular phenotype. We find nucleostemin is present in young myocardium and is also induced following cardiomyopathic injury. Nucleostemin expression in cardiomyocytes is induced by fibroblast growth factor-2 and accumulates in response to Pim-1 kinase activity. Cardiac stem cells also express nucleostemin that is diminished in response to commitment to a differentiated phenotype. Overexpression of nucleostemin in cultured cardiac stem cells increases proliferation while preserving telomere length, providing a mechanistic basis for potential actions of nucleostemin in promotion of cell survival and proliferation as seen in other cell types.
Key words: nucleostemin • cardioprotection • cardiomyocytes • stem cells • Pim-1 • telomerase
Related Article:
- A Nucleolar Weapon in Our Fight for Regenerating Adult Hearts: Nucleostemin and Cardiac Stem Cells
- Marc Tjwa and Stefanie Dimmeler
Circ. Res. 2008 103: 4-6.[Full Text] [PDF]
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