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Role of vitamin D3-binding protein in activation of mouse macrophages.

N Yamamoto and V R Naraparaju
J Immunol August 15, 1996, 157 (4) 1744-1749;
N Yamamoto
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V R Naraparaju
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Abstract

When mouse peritoneal nonadherent (lymphocytes) cells were treated with lysophosphatidylcholine (lyso-Pc) and cultured with adherent cells (macrophages) in 1% fetal calf serum (FCS)- or adult mouse serum (AMS)-supplemented medium for 3 h, markedly enhanced phagocytic and superoxide-generating capacities of macrophages were observed. Stepwise cultivation of lyso-Pc-treated B cells and untreated T cells with an FCS-supplemented medium generated a macrophage-activating factor (MAF), whereas cultivation of lyso-Pc-treated B cells alone in AMS-supplemented medium was sufficient to generate the MAF. The accumulated evidence suggests that lyso-Pc-inducible beta-galactosidase of B lymphocytes and the Neu-1 sialidase of T lymphocytes modified the bovine serum vitamin D3-binding protein (DBP) to yield the MAF, a protein with N-acetylgalactosamine as the remaining sugar. In contrast, the lyso-Pc-inducible beta-galactosidase of B cells alone modified mouse DBP to yield the MAF. These observations led us to conclude that bovine DBP carries a trisaccharide composed of N-acetylgalactosamine, galactose, and sialic acid, whereas mouse DBP carries a disaccharide composed of N-acetylgalactosamine and galactose. Thus, macrophages of a T-cell-deficient nude (BALB/c nu/nu) mouse and a T-cell Neu-1 sialidase-deficient SM/J mouse were efficiently activated by administration of lyso-Pc.

  • Copyright © 1996 by American Association of Immunologists

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The Journal of Immunology
Vol. 157, Issue 4
15 Aug 1996
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Role of vitamin D3-binding protein in activation of mouse macrophages.
N Yamamoto, V R Naraparaju
The Journal of Immunology August 15, 1996, 157 (4) 1744-1749;

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Role of vitamin D3-binding protein in activation of mouse macrophages.
N Yamamoto, V R Naraparaju
The Journal of Immunology August 15, 1996, 157 (4) 1744-1749;
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