Novel feature of metabolism of low density lipoprotein receptor in a mouse macrophage-like cell line, J774.1

Akihiko Yoshimura, T. Seguchi, T. Yoshida, S. Shite, M. Waki, M. Kuwano

Research output: Contribution to journalArticle

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Abstract

Biosynthesis, processing, and degradation of low density lipoprotein (LDL) receptors were studied in a mouse macrophage-like cell line, J774.1, by immunoprecipitation and immunoblotting with an antibody directed against the COOH-terminal 14 amino acids of the LDL receptor. The molecular weight of the mature LDL receptor of J774.1 cells maintained in RPMI medium was 140,000 under nonreducing condition and 160,000 under reducing condition in sodium dodecyl sulfate-polyacrylamide gels. These sizes are 10,000-15,000 daltons larger than those of the receptor in other mouse fibroblastic cells or P388 leucocyte. However, when J774.1 cells were cultured in Dulbecco's modified Eagle's medium, the molecular weight of the mature LDL receptor becomes similar to that in other mouse cell lines, 123,000 under nonreducing condition and 153,000 under reducing condition. The larger LDL receptor molecules produced by J774.1 cells cultured in RPMI were insensitive to the treatment with end-α-N-acetylgalactosaminidase (O-glycanase), suggesting that aberrant serine/threonine-linked (O-linked) glycosylation might account for the apparent large size. Pulse-chase experiments revealed that the rate of processing of the LDL receptor from precursor to mature form in J774.1 was similar to that in other mouse cell lines, but the rate of degradation was much faster: half-life of the LDL receptor of J774.1 was about 2 h. No significant difference in biological function or lifetime was observed between the normal and the larger LDL receptor. This novel character of molecular size and lifetime of the LDL receptor in J774.1 is discussed in relation to altered maturation and/or modification during receptor biosynthesis.

Original languageEnglish
Pages (from-to)11935-11942
Number of pages8
JournalJournal of Biological Chemistry
Volume263
Issue number24
Publication statusPublished - 1988
Externally publishedYes

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LDL Receptors
Macrophages
Metabolism
Cells
Cell Line
Biosynthesis
Cultured Cells
Molecular Weight
Molecular weight
Glycosylation
Degradation
Eagles
Threonine
Processing
Immunoprecipitation
Immunoblotting
Sodium Dodecyl Sulfate
Serine
Half-Life
Leukocytes

ASJC Scopus subject areas

  • Biochemistry

Cite this

Novel feature of metabolism of low density lipoprotein receptor in a mouse macrophage-like cell line, J774.1. / Yoshimura, Akihiko; Seguchi, T.; Yoshida, T.; Shite, S.; Waki, M.; Kuwano, M.

In: Journal of Biological Chemistry, Vol. 263, No. 24, 1988, p. 11935-11942.

Research output: Contribution to journalArticle

Yoshimura, A, Seguchi, T, Yoshida, T, Shite, S, Waki, M & Kuwano, M 1988, 'Novel feature of metabolism of low density lipoprotein receptor in a mouse macrophage-like cell line, J774.1', Journal of Biological Chemistry, vol. 263, no. 24, pp. 11935-11942.
Yoshimura, Akihiko ; Seguchi, T. ; Yoshida, T. ; Shite, S. ; Waki, M. ; Kuwano, M. / Novel feature of metabolism of low density lipoprotein receptor in a mouse macrophage-like cell line, J774.1. In: Journal of Biological Chemistry. 1988 ; Vol. 263, No. 24. pp. 11935-11942.
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