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  • Title: Molecular cloning and characterization of olive flounder (Paralichthys olivaceus) peroxisome proliferator-activated receptor gamma.
    Author: Cho HK, Kong HJ, Nam BH, Kim WJ, Noh JK, Lee JH, Kim YO, Cheong J.
    Journal: Gen Comp Endocrinol; 2009 Sep 15; 163(3):251-8. PubMed ID: 19393656.
    Abstract:
    Peroxisome proliferator-activated receptors (PPARs) are nuclear hormone receptors that play key roles in lipid and energy homeostasis. Olive flounder (Paralichthys olivaceus) PPARgamma cDNA (olPPARgamma) was isolated by reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). The full-length cDNA is 1667-bp long and encodes a polypeptide with 532 amino acids containing a C4-type zinc finger and a ligand-binding domain. Quantitative RT-PCR revealed that olPPARgamma transcription was detected from 7days post-hatching, and its expression was increased under a starved condition. Overexpression of olPPARgamma stimulated PPAR response element (PPRE) activity, and treatment with rosiglitazone, a PPARgamma agonist, augmented olPPARgamma-stimulated PPRE activity in HINAE olive flounder cells. Cotransfection of olPPARgamma and olRXRbeta, in the absence or presence of rosiglitazone and ciglitazone, produced a synergistic effect on PPRE transactivation in 3T3L1 adipocytes. Moreover, olPPARgamma, in the presence or absence of rosiglitazone, regulated the expression of lipid synthesis- and adipogenesis-related proteins in NIH3T3 and 3T3L1 cells. Taken together, these results suggest that olPPARgamma is functionally and evolutionarily conserved in olive flounder and mammals.
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