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• W2782094857 abstract "The ABC lipid transporters, ABCA1 and ABCG1, are essential for maintaining lipid homeostasis in cells such as macrophages by exporting excess cholesterol to extracellular acceptors. These transporters are highly regulated at the post-translational level, including protein ubiquitination. Our aim was to investigate the role of the E3 ubiquitin ligase HECTD1, recently identified as associated with ABCG1, on ABCG1 and ABCA1 protein levels and cholesterol export function. Here, we show that HECTD1 protein is widely expressed in a range of human and murine primary cells and cell lines, including macrophages, neuronal cells and insulin secreting β-cells. siRNA knockdown of HECTD1 unexpectedly decreased overexpressed ABCG1 protein levels and cell growth, but increased native ABCA1 protein in CHO-K1 cells. Knockdown of HECTD1 in unloaded THP-1 macrophages did not affect ABCG1 but significantly increased ABCA1 protein levels, in wild-type as well as THP-1 cells that do not express ABCG1. Cholesterol export from macrophages to apoA-I over time was increased after knockdown of HECTD1, however these effects were not sustained in cholesterol-loaded cells. In conclusion, we have identified a new candidate, the E3 ubiquitin ligase HECTD1, that may be involved in the regulation of ABCA1-mediated cholesterol export from unloaded macrophages to apoA-I. The exact mechanism by which this ligase affects this pathway remains to be elucidated." @default.
• W2782094857 created "2018-01-12" @default.
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• W2782094857 date "2018-04-01" @default.
• W2782094857 modified "2023-10-03" @default.
• W2782094857 title "The E3 ubiquitin ligase, HECTD1, is involved in ABCA1-mediated cholesterol export from macrophages" @default.
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• W2782094857 doi "https://doi.org/10.1016/j.bbalip.2017.12.011" @default.
• W2782094857 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29306077" @default.
• W2782094857 hasPublicationYear "2018" @default.
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