High fatty acid content in rabbit serum is responsible for the differentiation of osteoblasts into adipocyte-like cells

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
D D DiascroA Schmidt

Abstract

Osteoblasts and adipocytes originate from common mesenchymal precursors. With aging, there is a decrease in osteoprogenitor cells that parallels an increase of adipocytes in bone marrow. We observed that rabbit serum (RS) induces adipocyte-like differentiation in human osteosarcoma SaOS-2/B10 and MG-63 cell lines, in rat ROS17/2.8 cells, and in mouse calvaria-derived osteoblastic MB1.8 cells, as evidenced by the accumulation of Oil Red O positive lipid vesicles and the decrease in alkaline phosphatase expression. Both SaOS-2/B10 and MG-63 cells, but not ROS17/2.8 nor MB1.8 cells, express significant levels of PPARgamma mRNA, a member of the peroxisome proliferator activated receptor (PPAR) family that has been implicated in the control of adipocyte differentiation. However, both ROS17/2.8 and MG-63 cells express significant levels of the adipocyte selective marker, aP2 fatty acid binding mRNA, which can be further increased by RS. These cell types express PPARdelta/NUC-1 but not PPARalpha, indicating that cells that do not express either PPARgamma or PPARalpha are capable of differentiating into adipocyte-like cells. Transfection experiments in COS cells showed that compared with fetal bovine serum (FBS), RS is rich in agents t...Continue Reading

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