Cited by 21Lipid metabolism and disordersCholesterol and Lipid MetabolismLipoproteins and Cardiovascular Health

mRNA and apolipoprotein E synthesis abnormalities in peripheral blood monocyte macrophages in familial apolipoprotein E deficiency.

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Zannis, V I, Ordovas, J M, Cladaras, C, Cole, F S, Forbes, G, Schaefer, E J·1985·Journal of Biological Chemistry

Abstract

We have studied synthesis of apolipoprotein E (apo-E) and apo-E mRNA in cultures of peripheral blood human monocyte macrophages (M-M cultures) obtained from a patient with familial apolipoprotein E deficiency. We have found that the M-M cultures of the apo-E-deficient patients contained two apo-E mRNA species with slightly different molecular weight as compared to normal apo-E mRNA. The apo-E mRNA concentration of the apo-E-deficient cultures was approximately 50-fold reduced as compared to the normal cultures, whereas the actin mRNA concentrations were identical in both M-M cultures. Genomic blotting analysis using a full-length apo-E cDNA clone as hybridization probe did not show gross differences between the restriction patterns of the DNA obtained from the apo-E-deficient patient and two normal controls. When normal M-M cultures were grown in media containing [35S]methionine they synthesized and secreted apo-E into the culture media. In contrast we could not detect any intracellular or extracellular apo-E in the patient's M-M cultures grown under identical conditions. These observations are consistent with the hypothesis that familial apo-E deficiency results from structural apo-E gene mutation(s). The putative mutation(s) affect either the transcription of the apo-E gene or the processing of the primary apo-E mRNA transcript. These abnormalities are associated with low levels of synthesis of aberrant apo-E mRNA forms which are either very unstable or cannot be translated into protein.

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Authors
Zannis, V. I., Ordovas, J. M., Cladaras, C., Cole, F. S., Forbes, G., & Schaefer, E. J.
Affiliations
Boston University (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1985-10
Volume
260
Issue
24
Pages
12891-12894
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1533930495
Cited by
21
References
46
FWCI
3.15
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL-33952)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
apolipoprotein E deficiency, monocytes/macrophages, mRNA processing, genetic mutations, transcription, protein synthesis, mRNA instability, actin mRNA
MeSH terms
Apolipoproteins E, Cells, Cultured, DNA, DNA Restriction Enzymes, Humans, Macrophages, Monocytes, Mutation, Nucleic Acid Hybridization, RNA, Messenger, Transcription, Genetic

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