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• W4377094642 abstract "Adipogenesis, that is, the formation of terminally differentiated adipocytes is intricately regulated by transcription factors where CCAAT/enhancer binding protein alpha (C/EBPα) plays a key role. In the current study, we demonstrate that E3 ubiquitin ligase AIP4 negatively regulates C/EBPα protein stability leading to reduced adipogenesis. While AIP4 overexpression in 3T3-L1 cells preadipocytes inhibited lipid accumulation when treated with differentiation inducing media (MDI), AIP4 depletion was sufficient to partially promote lipid accumulation even in the absence of MDI. Mechanistically, overexpression of AIP4 inhibited protein levels of both ectopically expressed as well as endogenous C/EBPα while catalytically inactive AIP4 failed. On the contrary, AIP4 depletion profoundly enhanced endogenous C/EBPα protein levels. The observation that AIP4 levels decrease with concomitant increase in C/EBPα levels during adipocyte differentiation further indicated that AIP4 negatively regulates C/EBPα levels. We further show that AIP4 physically interacts with C/EBPα and ubiquitinates it leading to its proteasomal degradation. AIP4 promoted K48-linked ubiquitination of C/EBPα while catalytically inactive AIP4-C830A failed. Taken together, our data demonstrate that AIP4 inhibits adipogenesis by targeting C/EBPα for ubiquitin-mediated proteasome degradation." @default.
• W4377094642 created "2023-05-20" @default.
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• W4377094642 date "2023-05-19" @default.
• W4377094642 modified "2023-09-27" @default.
• W4377094642 title "AIP4 regulates adipocyte differentiation by targeting C/EBPα for ubiquitin‐mediated proteasomal degradation" @default.
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• W4377094642 doi "https://doi.org/10.1002/jcb.30421" @default.
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