Bone myofibroblasts

In the adult and in developing animals, SM a-actin is not expressed in SMC solely. It has also been demonstrated in the cells with mixed SM and NM cell characteristics such as myofibroblasts and myoepithelial cells [95,96] as well as in cells of the eye lens, hair follicles, and bone marrow stromal cells [97-99], During early development, SM a-actin is transiently expressed in cardiac and skeletal muscle tissue and its disappearance is concomitant with the achievement of maturation in the respective tissue [88,100,101]. 

Epperly MW, Guo H, Gretton JE, et al. Bone marrow origin of myofibroblasts in irradiation pulmonary fibrosis. Am J Respir CeU Mol Biol 2003 29 213-224. Dunsmore SE, Shapiro SD. The bone marrow leaves its scar new concepts in pulmonary fibrosis. J Chn Invest 2004 113 180-182. 

---