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Type 2 diabetic Tsumura, Suzuki, obese, diabetes (TSOD) mice gradually gain weight as compared to corresponding Tsumura, Suzuki, non-obesity (TSNO) control mice, and develop insulin resistance. Although development of type 2 diabetes mellitus is associated with dysfunction of adipocytes, little is known about the properties of adipocytes from TSOD mice. Therefore, we attempted to remove intracorporeal factors and elucidate inherent properties of adipocytes of TSOD mice using adipocytes differentiated from mouse embryonic fibroblasts (MEFs) in vitro. Here, we show that MEFs of TSOD have low potency for differentiation into adipocytes. The percentage of Oil red O-stained cells and levels of adipogenic markers in cells differentiated from MEFs of TSOD are lower than those in cells differentiated from MEFs of TSNO. We further show that treatment with an agonist of peroxisome proliferator-activated receptor-γ (PPARγ) (rosiglitazone) at an early stage of differentiation increases the percentage of Oil red O-stained cells in TSOD-MEFs differentiated into adipocytes. Moreover, the lipid droplet size in those adipocytes is larger than that in the adipocytes differentiated from MEFs of TSNO. Although persistent treatment of MEFs of TSOD with rosiglitazone during differentiation increases the percentage of Oil red O-stained cells, the lipid droplet size in adipocytes treated as such does not reach the size of those treated in early stage only. Thus, activation of PPARγ by its agonist at an early stage of differentiation compensates for the low potency toward adipogenic differentiation of, and accelerates formation of enlarged lipid droplets in adipocytes derived from, MEFs of TSOD mice.

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Activation of PPARγ at an Early Stage of Differentiation Enhances Adipocyte Differentiation of MEFs Derived from Type II Diabetic TSOD Mice and Alters Lipid Droplet Morphology