النتائج (
العربية) 1:
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Overall, it seems very likely that, at least in some WAT depots, brown adipocytes can emerge from differentiation of brown adipocyte precursors/preadipocytes or transdifferentiation of existing white adipocytes (Jimenez et al., 2003; Zingaretti et al., 2009). The precise origins of brown cells in WAT will likely be determined within the very near future since recent studies have started to identify the progenitors of brown as well as white adipocytes. In the case of brown cells, tracing the lineages arising from progenitors expressing the myogenic transcription factor, myf5 have clearly shown that brown adipocytes within the interscapular BAT depot of mice share an origin with skeletal myocytes that arise from the dermomyotome (Seale et al., 2008). In these investigations, the brown cells recruited to WAT in response to the cold were myf5 negative, thus unlikely to share a myogenic origin. Two independent studies employing different procedures have identified white progenitors within the microvasculature of adipose tissue and not of other tissues (Rodeheffer et al., 2008; Tang et al., 2008). These progenitors express markers of mural cells (pericytes) that arise from the sclerotome and give rise to several other cell types of the vasculature. It is conceivable; therefore, that recruitment of WAT brown adipocytes is due to a selective activation of these mural cells to progress along a brown lineage in response to effectors that are activated by the recruitment-associated stimulus. Possible effectors include BMP7, which has been shown to induce the conversion of mesenchymal stem cells to brown adipocytes in culture and is required for BAT formation in mice (Tseng et al., 2008).Go to:
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