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Perilipin, a major hormonally regulated adipocyte-specific phosphoprotein associated with the periphery of lipid storage droplets

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Greenberg, A.S., Egan, J.J., Wek, S.A., Garty, N.B., Blanchette-Mackie, E.J., Londos, C.·1991·Journal of Biological Chemistry

Abstract

The lipid fraction ("fat cake") of rat epididymal adipocytes contains a prominent phosphoprotein (62 kDaapp by sodium dodecyl sulfate-polyacrylamide gel electrophoresis) that is multiply phosphorylated by cAMP-dependent protein kinase in vivo, at which point it migrates as a 65/67-kDaapp doublet by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and is by far the most heavily radiolabeled protein in the cell. Western blot analysis of various tissues with immunopurified antibodies purified from antisera raised against the 62-kDa species suggests that the protein is specific for adipocytes. This protein, which we term perilipin, is found in differentiated cultured 3T3-L1 adipocytes, but not in their precursor 3T3-L1 fibroblasts. Immunocytochemical studies with specific antiserum shows that the perilipin is closely associated with the periphery of lipid storage droplets in cultured adipocytes. Given its adipocyte specificity, acute regulation by hormones, and subcellular location, we speculate that perilipin plays a role in the specialized lipid storage function of adipocytes.

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Authors
Greenberg, A. S., Egan, J. J., Wek, S. A., Garty, N. B., Blanchette-Mackie, E. J., & Londos, C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1991-06
Volume
266
Issue
17
Pages
11341-11346
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1593931056
Cited by
832
References
0
FWCI
2.40
Type
journal article
Language
en
Open access
hybrid

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