Abstract
The possible existence of adipocyte precursors in adult rat adipose tissue was investigated. Cells were isolated from the stromal fraction of adipose tissue and were grown in culture. Skin fibroblasts were used as controls. The stromal fraction cells were initially fusiform and proliferated; in culture, they accumulated lipid inclusions, became rounder and acquired an eccentric nucleus. In contrast, the skin fibroblasts from the same rat grown under identical culture conditions, did not exhibit any appreciable lipid accumulation. The doubling time for both the stromal fraction cells and skin fibroblasts was 40-60 h. At confluency, the stromal fraction cells contained 5-7 times more glyceride-glycerol than skin fibroblasts. Thus, adipose tissue of adult rats contains cells with the potential to proliferate and acquire morphological characteristics similar to those of adipocytes.
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