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The Journal of Immunology, Vol 151, Issue 11 6225-6236, Copyright © 1993 by American Association of Immunologists
ARTICLES |
T Yoshimura and DG Johnson
Immunopathology Section, National Cancer Institute-Frederick Cancer Research and Development Center MD 21702.
cDNA for neutrophil attractant protein-1 (NAP-1, also known as IL-8) was cloned from Con A-stimulated guinea pig spleen cells with human NAP- 1 cDNA as a probe. Guinea pig NAP-1 cDNA is composed of 1433 bp with an open reading frame which encodes for a 101-amino-acid protein. Guinea pig NAP-1 had 70% amino acid sequence similarity to human NAP-1, which was much higher than a similarity between human and guinea pig monocyte chemoattractant protein-1 (MCP-1) (56%). Nucleotide sequence similarity within the coding region was 75%. To confirm its biological activity in guinea pig, recombinant guinea pig NAP-1 was expressed in COS-7 cells then purified. N-terminal sequence analysis gave two different N- termini at position 23 (Met) or 24 (Val). The two proteins showed their peak activity for guinea pig neutrophils at the concentration of 1 microgram/ml (10-7 M). Despite its high similarity to human NAP-1, the responsiveness of human neutrophils to guinea pig NAP-1 was minimum. Recombinant guinea pig NAP-1 caused strong neutrophil infiltration after intradermal injection into guinea pig skin. Since guinea pig is classified as a rodent, it was of interest to know whether human NAP-1 cDNA hybridizes to genomic DNA of other rodents such as mouse or rat, in which a NAP-1 homologue has not been found. Under low stringency conditions, human NAP-1 cDNA hybridized to human, rabbit, and guinea pig DNA, but not to mouse or rat DNA. Unlike NAP-1, human MCP-1 cDNA hybridized to genomic DNA of rabbit, guinea pig, mouse, and rat; MCP-1 cDNA have been cloned from these species. The apparent absence of a NAP- 1 gene in mouse or rat makes this chemoattractant unique among the members of the protein family to which NAP-1 and MCP-1 belong.
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