期刊
CIRCULATION
卷 122, 期 20, 页码 2048-U147出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCULATIONAHA.110.965202
关键词
inflammation; muscle, smooth; monocytes; progenitor cells
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- National Institute of Biomedical Innovation
- Japan Science and Technology Institute
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [21117007] Funding Source: KAKEN
Background-It has been proposed that bone marrow-derived cells infiltrate the neointima, where they differentiate into smooth muscle (SM) cells; however, technical limitations have hindered clear identification of the lineages of bone marrow-derived SM cell-like cells. Methods and Results-Using a specific antibody against the definitive SM cell lineage marker SM myosin heavy chain (SM-MHC) and mouse lines in which reporter genes were driven by regulatory programs for either SM-MHC or SM alpha-actin, we demonstrated that although some bone marrow-derived cells express SM alpha-actin in the wire injury-induced neointima, those cells did not express SM-MHC, even 30 weeks after injury. Likewise, no SM-MHC+ bone marrow-derived cells were found in vascular lesions in apolipoprotein E-/- mice or in a heart transplantation vasculopathy model. Instead, the majority of bone marrow-derived SM alpha-actin(+) cells were also CD115(+)CD11b(+)F4/80(+)Ly-6C(+), which is the surface phenotype of inflammatory monocytes. Moreover, adoptively transferred CD11b(+)Ly-6C(+) bone marrow cells expressed SM alpha-actin in the injured artery. Expression of inflammation-related genes was significantly higher in neointimal subregions rich in bone marrow-derived SM alpha-actin(+) cells than in other regions. Conclusions-It appears that bone marrow-derived SM alpha-actin(+) cells are of monocyte/macrophage lineage and are involved in vascular remodeling. It is very unlikely that these cells acquire the definitive SM cell lineage. (Circulation. 2010; 122: 2048-2057.)
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