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Biochemical and biologic characterization of murine monocyte chemoattractant protein-1. Identification of two functional domains.

C A Ernst, Y J Zhang, P R Hancock, B J Rutledge, C L Corless and B J Rollins
J Immunol April 1, 1994, 152 (7) 3541-3549;
C A Ernst
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Y J Zhang
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P R Hancock
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B J Rutledge
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C L Corless
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B J Rollins
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Abstract

Monocyte chemoattractant protein-1 (MCP-1) is a member of the chemokine-beta (or C-C) family of cytokines. Murine MCP-1, first identified as the JE gene, differs from human MCP-1 in molecular size and extent of glycosylation. We have used Chinese hamster ovary cells to express recombinant murine MCP-1 and find that its predominant form is a microheterogeneous protein of M(r) approximately 25,000. Most of MCP-1's microheterogeneity is due to variable amounts of sialic acid that are terminally attached to a constant number of O-linked oligosaccharide chains per molecule. This carbohydrate, along with a small amount of N-linked carbohydrate, accounts for 50% of the apparent molecular size of murine MCP-1 and is not required for in vitro monocyte chemoattractant activity. Mutational analysis shows that most of the carbohydrate is added to a 49-amino acid C-terminal domain that is not present in human MCP-1 and is not required for in vitro biologic activity, suggesting that murine MCP-1 consists of an N-terminal domain containing monocyte chemoattractant activity and a heavily glycosylated C-terminal domain of as yet unknown function. MCP-1 produced in COS cells contains a small amount of sulfate, but Chinese hamster ovary-produced MCP-1 does not. The absence of sulfate does not alter MCP-1's in vitro chemoattractant properties. In vitro, highly purified murine MCP-1 attracts monocytes, but not neutrophils, with a specific activity similar to human MCP-1 (EC50 approximately 0.5 nM). Equilibrium binding experiments with human monocytes reveal the presence of approximately 3000 binding sites per cell with a Kd of 0.77 nM. In vivo, injection of up to 1 micrograms murine MCP-1 in a variety of murine strains induces the appearance of a sparse mixed inflammatory infiltrate. The disparity between MCP-1's in vitro and in vivo effects suggests that other factors may be required to elicit a full-blown monocyte chemotactic response to MCP-1 in vivo.

  • Copyright © 1994 by American Association of Immunologists

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The Journal of Immunology
Vol. 152, Issue 7
1 Apr 1994
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Biochemical and biologic characterization of murine monocyte chemoattractant protein-1. Identification of two functional domains.
C A Ernst, Y J Zhang, P R Hancock, B J Rutledge, C L Corless, B J Rollins
The Journal of Immunology April 1, 1994, 152 (7) 3541-3549;

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Biochemical and biologic characterization of murine monocyte chemoattractant protein-1. Identification of two functional domains.
C A Ernst, Y J Zhang, P R Hancock, B J Rutledge, C L Corless, B J Rollins
The Journal of Immunology April 1, 1994, 152 (7) 3541-3549;
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Print ISSN 0022-1767        Online ISSN 1550-6606