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- W2012099782 abstract "Despite numerous studies demonstrating that microsomal triglyceride transfer protein (MTP) activity is critical to apoB secretion, there is still controversy as to whether MTP directly facilitates the translocation of apoB across the membrane of the endoplasmic reticulum (ER) through either the recruitment of lipids and/or chaperone activity. In the present study, a specific inhibitor of MTP (BMS 197636) was utilized in HepG2 cells to investigate whether a direct relationship exists between the translocation of apoB across the ER membrane and the lipid-transferring activity of MTP. Inhibition of MTP (with 10 and 50 nmol/L of the inhibitor) did not significantly affect the translocation of newly synthesized apoB ( P = 0.77) or the translocational efficiency of the steady-state apoB mass ( P = 0.45), despite a 49% decrease in apoB secretion and increased proteosomal degradation. These results compared well with subcellular fractionation experiments which showed no significant change in the fraction of apoB accumulated in the lumen of isolated microsomes in MTP-treated cells ( P = 0.35). In summary, MTP lipid transfer activity does not appear to influence translocational status of apoB, but its inhibition is associated with an increased susceptibility to proteasome-mediated degradation and reduced assembly and secretion of apoB lipoprotein particles." @default.
- W2012099782 created "2016-06-24" @default.
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- W2012099782 date "2000-10-01" @default.
- W2012099782 modified "2023-09-26" @default.
- W2012099782 title "Translocational Status of ApoB in the Presence of an Inhibitor of Microsomal Triglyceride Transfer Protein" @default.
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- W2012099782 doi "https://doi.org/10.1006/bbrc.2000.3509" @default.
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