Genes for apolipoprotein B and microsomal triglyceride transfer protein are expressed in the heart: Evidence that the heart has the capacity to synthesize and secrete lipoproteins

Expression of both the apolipoprotein B (apoB) gene and the microsomal triglyceride transfer protein (MTP) gene is required for the assembly and secretion of triglyceride-rich lipoproteins in the liver and intestine. Both genes have been assumed to be silent in the heart. Northern blot and RNase pro...

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Bibliographic Details
Published in:Circulation (New York, N.Y.) N.Y.), 1998-07, Vol.98 (1), p.13-16
Main Authors: NIELSEN, L. B, VENIANT, M, HAMILTON, R. L, YOUNG, S. G, BOREN, J, RAABE, M, WONG, J. S, TAM, C, FLYNN, L, VANNI-REYES, T, GUNN, M. D, GOLDBERG, I. J
Format: Article
Language:English
Subjects:
Animals
Apolipoproteins B - genetics
Biological and medical sciences
Carrier Proteins - genetics
Fundamental and applied biological sciences. Psychology
Gene Expression
Heart
Histocytochemistry
Humans
In Situ Hybridization
Lipoproteins - metabolism
Mice
Microsomes
Myocardium - metabolism
Myocardium - ultrastructure
RNA, Messenger - analysis
Vertebrates: cardiovascular system
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Summary:Expression of both the apolipoprotein B (apoB) gene and the microsomal triglyceride transfer protein (MTP) gene is required for the assembly and secretion of triglyceride-rich lipoproteins in the liver and intestine. Both genes have been assumed to be silent in the heart. Northern blot and RNase protection analyses showed that the apoB and MTP genes were expressed in the hearts of mice and humans. In situ hybridization studies revealed that the apoB mRNA was produced in cardiac myocytes. Electron microscopy of human cardiac myocytes revealed lipid-staining particles of relatively small diameter (approximately 250 A) within the Golgi apparatus. These studies strongly suggest that the heart synthesizes and secretes apoB-containing lipoproteins.
ISSN:0009-7322
1524-4539
DOI:10.1161/01.CIR.98.1.13