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JCS ePress
online publication date 30 Mar 2004
doi: 10.1242/jcs.01051
Research Article
Role of bone marrow cell trafficking in replenishing skeletal muscle SP and MP cell populations
François Rivier,
Ozan Alkan,
Alan F. Flint,
Kristina Muskiewicz,
Paul D. Allen,
Philippe Leboulch,
and
Emanuela Gussoni*
* Author for correspondence (e-mail: gussoni{at}enders.tch.harvard.edu)
The multipotent nature of skeletal muscle-derived side population cells is demonstrated by their myogenic and hematopoietic potential in vivo. However, whether muscle side population cells are derived from the bone marrow is unclear. To study the long-term contribution of the hematopoietic system to muscle side population, whole bone marrow cells from Ly5.1 males or from e-GFP transgenic male mice were transplanted into lethally irradiated Ly5.2 females. Long-term cell trafficking of donor bone marrow cells to muscle side population was monitored 17 times in a 34-week study. Fluorescence-activated cell sorter analyses were used to detect Ly5.1 and GFP+ donor cells, which were confirmed by fluorescence in situ hybridization of the Y-chromosome. Analyses post-transplantation indicated that whereas cells of donor origin could be found in the muscle, donor bone marrow cells had contributed little to the muscle side population. Attempts to increase cell trafficking by induced muscle damage again confirmed that more than 90% of side population cells present in the muscle were derived from the host. These results demonstrate that muscle side population cells are not replenished by the bone marrow and suggest a non-hematopoietic origin for this cell population.
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