Abstract
The behavior of isolated, disaggregated white adipose cells obtained from marrow and extramedullar sites in the rabbit was compared in monolayer cultures. Both cell types transform within 2 weeks into fibroblast-like cells which can be maintained in subcultures. Both in freshly isolated state and in fibroblast-like state the marrow adipocyte contains esterase activities reacting with naphthol AS acetate and D-chloracetate. These activites are not present in extramedullary cells. In addition, alpha-naphthyl butyrate-reacting esterase, present in both cell types, is fluoride-resistant in marrow adipocytes but labile in extramedullar cells. These differences are consistent with heterogeneity of white adipose tissue and suggest different potentials for marrow and extramedullary adipocytes.
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