Aging impairs the beneficial effect of granulocyte colony-stimulating factor and stem cell factor on post-myocardial infarction remodeling

Stephanie Lehrke, Ramesh Mazhari, Daniel J. Durand, Meizi Zheng, Djahida Bedja, Jeffrey M. Zimmet, Karl H. Schuleri, Andrew S. Chi, Kathleen L. Gabrielson, Joshua M. Hare

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

Granulocyte colony-stimulating factor (G-CSF) and stem cell factor (SCF) are potential new therapies to ameliorate post-myocardial infarction (post-MI) remodeling, as they enhance endogenous cardiac repair mechanisms and decrease cardiomyocyte apoptosis. Because both of these pathways undergo alterations with increasing age, we hypothesized that therapeutic efficacy of G-CSF and SCF is impaired in old versus young adult rats. MI was induced in 6- and 20-month-old rats by permanent ligation of the left coronary artery. In young animals, G-CSF/SCF therapy stabilized and reversed a decline in cardiac function, attenuated left ventricular dilation, decreased infarct size, and reduced cardiomyocyte hypertrophy. Remarkably, these effects on cardiac structure and function were absent in aged rodents. This could not be attributed to ineffective mobilization of bone marrow cells or decreased quantity of c-Kit cells within the myocardium with aging. However, whereas the G-CSF/SCF cocktail reduced cardiac myocyte apoptosis in old as well as in young hearts, the degree of reduction was substantially less with age and the rate of cardiomyocyte apoptosis in old animals remained high despite cytokine treatment. These findings demonstrate that G-CSF/SCF lacks therapeutic efficacy in old animals by failing to offset periinfarct apoptosis and therefore raise important concerns regarding the efficacy of novel cytokine therapies in elderly individuals at greatest risk for adverse consequences of MI.

Original languageEnglish (US)
Pages (from-to)553-560
Number of pages8
JournalCirculation research
Volume99
Issue number5
DOIs
StatePublished - Sep 2006

Keywords

  • Aging
  • Growth substances
  • Myocardial infarction
  • Remodeling

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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    Lehrke, S., Mazhari, R., Durand, D. J., Zheng, M., Bedja, D., Zimmet, J. M., Schuleri, K. H., Chi, A. S., Gabrielson, K. L., & Hare, J. M. (2006). Aging impairs the beneficial effect of granulocyte colony-stimulating factor and stem cell factor on post-myocardial infarction remodeling. Circulation research, 99(5), 553-560. https://doi.org/10.1161/01.RES.0000238375.88582.d8