Abstract
Two types of adipose cells were found in the connective tissue on day 7 after bone matrix gelatin (BMG) implantation and an injection of bupivacaine: mature adipose cells with a large lipid droplet (2-140 microns) and immature adipose cells with many small lipid droplets (0.1-2 microns). On day 10 after BMG implantation, typical adipose tissue was observed near the implant. The immature adipose cells had small, spherical mitochondria, glycogen granules and cytoplasmic microvesicles, and they might differentiate from undifferentiated mesenchymal cells in the connective tissue or the peripheral cells around the vessels as a white adipose tissue. These findings suggest that the differentiation of adipose cells in the connective tissue near heterotopic bone formation might be induced not only by mechanical and/or bupivacaine injury, but also by some factor or factors of the BMG.
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