Bone marrow-derived cells contribute to cell turnover in aging murine hearts

Szardien,Sebastian; Nef,Holger  M.; Troidl,Christian; Willmer,Matthias; Voss,Sandra; Liebetrau,Christoph; Hoffmann,Jedrzej; Rolf,Andreas; Rixe,Johannes; Elsässer,Albrecht; Hamm,Christian  W.; Möllmann,Helge

doi:10.3892/ijmm.2012.995

Bone marrow-derived cells contribute to cell turnover in aging murine hearts

Authors:
- Sebastian Szardien
- Holger M. Nef
- Christian Troidl
- Matthias Willmer
- Sandra Voss
- Christoph Liebetrau
- Jedrzej Hoffmann
- Andreas Rolf
- Johannes Rixe
- Albrecht Elsässer
- Christian W. Hamm
- Helge Möllmann
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Affiliations: Department of Cardiology, Kerckhoff Heart Center, D-61231 Bad Nauheim, Germany, Experimental Cardiology, Franz-Groedel-Institute, Kerckhoff Heart Center, D-61231 Bad Nauheim, Germany, Department of Cardiology, Klinikum Oldenburg, D-26121 Oldenburg, Germany
Published online on: May 9, 2012 https://doi.org/10.3892/ijmm.2012.995
Pages: 283-287

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Abstract

The paradigm that cardiac myocytes are non-proliferating, terminally differentiated cells was recently challenged by studies reporting the ability of bone marrow-derived cells (BMCs) to differentiate into cardiomyocytes after myocardial damage. However, little knowledge exists about the role of BMCs in the heart during physiological aging. Twelve-week-old mice (n=36) were sublethally irradiated and bone marrow from littermates transgenic for enhanced green fluorescent protein (eGFP) was transplanted. After 4 weeks, 18 mice were sacrificed at the age of 4 months and served as controls (group A); the remaining mice were sacrificed at the age of 18 months (group B). Group A did not exhibit a significant number of eGFP+ cells, whereas 9.4±2.8 eGFP+ cells/mm2 was documented in group B. In total, only five eGFP+ cardiomyocytes were detected in 20 examined hearts, excluding a functional role of BM differentiation in cardiomyocytes. Similarly, a relevant differentiation of BMCs in endothelial or smooth muscle cells was excluded. In contrast, numerous BM-derived fibroblasts and myofibroblasts were observed in group B, but none were detected in group A. The present study demonstrates that BMCs transdifferentiate into fibroblasts and myofibroblasts in the aging murine myocardium, suggesting their contribution to the preservation of the structural integrity of the myocardium, while they do not account for regenerative processes of the heart.

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