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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of cytokine-induced neutrophil chemoattractants (CINC), rat GRO/CINC-2 alpha and CINC-2 beta, produced by granulation tissue in culture: purification, complete amino acid sequences and characterization.

Four basic neutrophil chemotactic factors (chemokines) have been purified from conditioned medium of granulation tissue obtained from carrageenin-induced inflammation in the rat. On the basis of their N-terminal amino acid sequences, one of the chemokines was identical with rat GRO/cytokine-induced neutrophil chemoattractant (CINC) which we reported previously, and another was identical with rat macrophage inflammatory protein-2 (MIP-2). Two other chemokines were novel chemoattractants related to MIP-2. The novel chemokines are referred to as rat GRO/CINC-2 alpha and CINC-2 beta, and consequently CINC and rat MIP-2 are renamed rat GRO/CINC-1 and CINC-3 respectively. The complete amino acid sequences of purified CINC-2 alpha and CINC-3 were determined by analysis of the fragments isolated from proteinase V8-treated CINCs. The cDNA for CINC-2 beta was cloned by reverse transcription/PCR amplification using specific primers starting with total RNA extracted from lipopolysaccharide-stimulated rat macrophages. A comparison of the amino acid sequence encoded by the cDNA with the N-terminal amino acid sequence of purified CINC-2 beta revealed that mature CINC-2 beta is a 68-residue chemoattractant produced by cleavage of a 32-residue signal peptide. The difference in amino acid sequences between CINC-2 alpha and CINC-2 beta consisted of only three C-terminal residues. Rat GRO/CINC-2 alpha is a major chemokine, and the four purified chemokines have similar chemotactic activity, suggesting that they contribute to neutrophil infiltration into inflammatory sites in rats.[1]


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