Adipose conversion of mouse bone marrow fibroblasts in vitro: Their alkaline phosphatase activity.

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Abstract
By an in vitro colony assay and cytochemical staining, we investigated the capacity of mouse bone marrow fibroblasts to differentiate into adipocytes and to express alkaline phosphatase (ALP) activity. Gluco-corticoids enhanced colony formation of the fibroblasts, and stimulated their adipose conversion (55-65 % of the colonies became adipocyte-positive), but they did not affect ALP activity. The fibroblasts became heterogenous in size and morphology after growing in vitro then differentiated into adipocytes. All the cell types had ALP activity, and more than 95 % of the colonies contained ALP-positive cells. ALP staining was strongest in cells in the early stage of adipose conversion, gradually decreasing with maturation. Our results indicate that the majority of the mouse bone marrow fibroblasts that formed colonies under our culture conditions are preadipocytes. We conclude that these fibroblasts originate from adventitial reticular cells present in bone marrow stroma because reticular cells have been reported to possess high ALP activity and have been suggested to differentiate into adipocytes.

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