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Extrahepatic synthesis of apolipoprotein E.

D M Driscoll, G S Getz

    Journal of Lipid Research
    |December 1, 1984
    PubMed
    Summary

    Apolipoprotein E (apoE) is synthesized in various rat and guinea pig tissues, including macrophages and smooth muscle cells, but not intestinal mucosa. This finding suggests novel roles for apoE beyond lipoprotein metabolism.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Apolipoprotein E (apoE) is primarily known for its role in lipoprotein metabolism.
    • Previous studies have focused on apoE synthesis in the liver.

    Purpose of the Study:

    • To investigate the synthesis of apoE in various extrahepatic tissues.
    • To identify the tissues responsible for apoE production and explore potential regulatory mechanisms.

    Main Methods:

    • In vitro translation and [35S]methionine labeling of tissue slices from rats and guinea pigs.
    • Electrophoretic mobility, immunologic reactivity, and limited proteolysis mapping to identify synthesized apoE.
    • Hybridization with a rat apoE cDNA clone to detect apoE mRNA.
    • Analysis of apoE gene methylation patterns in different tissues.

    Main Results:

    • ApoE synthesis was detected in spleen, adrenal, kidney, testis, ovary, heart, and lung, but not in intestinal mucosa.
    • The synthesized protein was confirmed as apoE through multiple identification methods.
    • ApoE mRNA was present in both hepatic and extrahepatic tissues.
    • The apoE gene was more methylated in intestinal mucosa compared to other synthesizing tissues.
    • Macrophages and aortic smooth muscle cells were shown to synthesize and secrete apoE.

    Conclusions:

    • Apolipoprotein E (apoE) is synthesized in a wide range of extrahepatic tissues, including immune cells and vascular cells.
    • The absence of apoE synthesis in intestinal mucosa may be linked to differential gene methylation.
    • These findings suggest potential novel functions for apoE in peripheral tissues beyond its established role in lipid transport.

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