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Differentiation of stromal-vascular cells isolated from canine adipose tissues in primary culture.

A culture condition supporting adipocyte differentiation of stromal-vascular (S-V) cells isolated from canine adipose tissues was established. Morphological observation and determination of glycerol-3-phosphate dehydrogenase (GPDH) activity were used as the criteria for adipocyte differentiation. After reaching confluence, the cells were able to undergo terminal adipocyte differentiation by treatment with 100 microM indomethacin, 10 microg/ml insulin and 0.5 mM 1-methyl-3-isobutylxanthine (MIX) in medium supplemented with 5% fetal calf serum (FCS). In the absence of either indomethacin or insulin, the S-V cells did not undergo adipose conversion and GPDH activity was not increased, indicating that both indomethacin and insulin play essential roles in this culture system. The S-V cells from inguinal adipose tissues exhibited the greatest increase in GPDH activity among the four depots (inguinal > abdominal-subcutaneous > perirenal > omental). demonstrating that adipocyte differentiation was also intensely dependent on anatomic sites from which the S-V cells were derived. Interestingly, dimethylsulfoxide (DMSO) was found to accelerate adipocyte differentiation in combination with indomethacin and insulin. Under this condition, up to 90% of the cells displayed adipocyte phenotypes and the GPDH activity reached 1288 +/- 441 mU/mg protein. This culture system may be useful for investigating other adipogenic factors as well as anti-adipogenic factors involved in the regulation of canine adipose tissue development.