You can isolate the adherent population of bone marrow cells at 3-7 days after plating, expand and force them to differentiate by using a standard adipogenic cocktail. Alternatively, if you have an abundance of fat cells in marrow (fatty marrow) the cells can be purified by partial centrifugation at 600 xg where mature adipocytes remain in the top layer while the other cells pellet out.
ShuoHuang,LiangliangXu,YuxinSun,TianyiWuabKuixingWangabcGangLi.An improved protocol for isolation and culture of mesenchymal stem cells from mouse bone marrow. Journal of Orthopaedic Translation; 3, (1), 2015, Pages 26-33
Davies OG, Cooper PR, Shelton RM, Smith AJ, Scheven BA. Isolation of adipose and bone marrow mesenchymal stem cells using CD29 and CD90 modifies their capacity for osteogenic and adipogenic differentiation. Journal of Tissue Engineering. 2015;6:2041731415592356. doi:10.1177/2041731415592356.
Isolation of Mouse Marrow Mesenchymal Progenitors by a Novel and Reliable Method. SHENGKUN SUN,,ZIKUAN GUO, a XUREN XIAO, BING LIU, a XIAODAN LIU, PEI-HSIEN TANG, a NING MAO.
Alexandra Peister, Jason A. Mellad, Benjamin L. Larson, Brett M. Hall, Laura F. Gibson, and Darwin J. Prockop .Adult stem cells from bone marrow (MSCs) isolated from different strains of inbred mice vary in surface epitopes, rates of proliferation, and differentiation potential . BLOOD, 1 MARCH 2004 VOLUME 103, NUMBER . STEM CELLS 2003;21:527-535