A Deficiency of Microsomal Triglyceride Transfer Protein Reduces Apolipoprotein B Secretion

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A deficiency of microsomal triglyceride transfer protein reduces apolipoprotein B secretion.

Microsomal triglyceride transfer protein (MTP) transfers lipids to apolipoprotein B (apoB) within the endoplasmic reticulum, a process that involves direct interactions between apoB and the large subunit of MTP. Recent studies with heterozygous MTP knockout mice have suggested that half-normal levels of MTP in the liver reduce apoB secretion. We hypothesized that reduced apoB secretion in the s...

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Hepatic overexpression of microsomal triglyceride transfer protein (MTP) results in increased in vivo secretion of VLDL triglycerides and apolipoprotein B.

The microsomal triglyceride transfer protein (MTP) is essential for the hepatic secretion of apolipoprotein (apo) B-containing lipoproteins. Previous studies have indicated that inhibition of MTP results in decreased apoB plasma levels and decreased hepatic triglyceride secretion. However, the metabolic effects of overexpression of MTP have not been investigated. We constructed a recombinant ad...

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Microsomal triglyceride transfer protein: a multifunctional protein.

Microsomal triglyceride transfer protein (MTP) is a heterodimeric protein that transfers neutral lipids between membranes in vitro. Absence of this lipid transfer activity in the microsomes of abetalipoproteinemia patients established its pivotal function in lipoprotein assembly. Recent studies indicate that the lipid transfer activity is involved in importing triglycerides into the lumen of th...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 2000

ISSN: 0021-9258

DOI: 10.1074/jbc.275.11.7515