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Watanabe, Kazuhisa; Yokota, Kazuha; Yoshida, Ken; Matsumoto, Ayumi; Iwamoto, Sadahiko
Biochemistry and biophysics reports, 12/2019, Volume: 20Journal Article
N4BP2l1, which is highly expressed in oral squamous cell carcinoma, is associated with poor prognosis. However, N4bp2l1's role in adipogenesis remains unknown. We aimed to clarify the expression profile and transcriptional regulation of N4bp2l1 to elucidate the functions underlying the role of N4bp2l1 in adipocyte differentiation. Our results revealed that N4bp2l1 mRNA expression increased in 3T3-L1 cells in a differentiation-dependent manner. To investigate the transcriptional regulation of N4bp2l1, the 2-kb 5′ region upstream of the mouse N4bp2l1 promoter was cloned into a luciferase vector. Luciferase reporter assays indicated that USF1 induces the N4bp2l1 promoter activity. Electrophoretic mobility shift and chromatin immunoprecipitation assays confirmed that USF1 directly binds to the Ebox in the N4bp2l1 promoter. Furthermore, the expressions of adipocyte differentiation markers significantly decreased in N4bp2l1-knockdown cells compared with those in control cells. Our results demonstrated that N4bp2l1 is a novel USF1 target gene that may be involved in adipogenesis regulation. •N4bp2l1 expression is increased in a differentiation-dependent manner in 3T3-L1.•N4bp2l1 is a novel USF1 target gene.•USF1 directly binds to the Ebox in the N4bp2l1 promoter.•Inhibition of 3T3-L1 adipocyte differentiation by N4bp2l1 knockdown.
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