Recent studies have suggested that bone marrow cells possess a broad differentiation potential, being able to form new liver cells, cardiomyocytes and neurons1,2. Several groups have attributed this apparent plasticity to ‘transdifferentiation’3,4,5. Others, however, have suggested that cell fusion could explain these results6,7,8,9. Using a simple method based on Cre/lox recombination to detect cell fusion events, we demonstrate that bone-marrow-derived cells (BMDCs) fuse spontaneously with neural progenitors in vitro. Furthermore, bone marrow transplantation demonstrates that BMDCs fuse in vivo with hepatocytes in liver, Purkinje neurons in the brain and cardiac muscle in the heart, resulting in the formation of multinucleated cells. No evidence of transdifferentiation without fusion was observed in these tissues. These observations provide the first in vivo evidence for cell fusion of BMDCs with neurons and cardiomyocytes, raising the possibility that cell fusion may contribute to the development or maintenance of these key cell types.
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The authors thank G. Martin and P. Soriano for transgenic mouse lines, J. Maher at the UCSF Liver Centre for advice and assistance, and M. Kiel, O. Yilmaz and The University of Michigan Flow Cytometry Core for help with flow cytometry. R.P. thanks E. Schaller for technical help. M.A-D. thanks B. Rico, I. Cobos, T. Aragon and U. Borello for personal and scientific support. This work was supported by grants from NIH, the Sandler Foundation, the Spanish Ministry of Science and Technology (Ataxias Cerebelosa), and the Deutsche Forschungsgemeinschaft (DFG). R.P. was the recipient of a postdoctoral fellowship from the Spanish Ministry of Science and Technology.
The authors declare that they have no competing financial interests.
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Alvarez-Dolado, M., Pardal, R., Garcia-Verdugo, J. et al. Fusion of bone-marrow-derived cells with Purkinje neurons, cardiomyocytes and hepatocytes. Nature 425, 968–973 (2003). https://doi.org/10.1038/nature02069
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