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描述:
Human CCL13 is a CC chemokine recently cloned from a human fetal and a human heart
cDNA library. Human CCL13 cDNA encodes a 98 amino acid residue precursor protein with a
23 amino acid residue hydrophobic signal peptide that is cleaved to yield an 8 kDa, 75 aa
mature CCL13. Mature CCL13 lacks any potential N-glycosylation sites and shares a
pyroglutamate proline motif with other human MCP proteins. Human CCL13 is most
homologous to MCP1, 3 and Eotaxin, exhibiting approximately 65 66% amino acid sequence
identity. CCL13 mRNA is expressed by a number of activated cell types, including endothelial
cells, macrophages, bronchial epithelium and type II alveolar cells, and perhaps lymphocytes.
CCL13 is a chemoattractant for monocytes and eosinophils, and activates basophils. In addition,
it has been reported to be chemotactic for CD4+ and CD8+ T cells, with an activity almost
equivalent to that of MCP3. The bioactivities of CCL13 is most likely mediated by the CC
chemokine receptors CCR2 and CCR3, both of which have been shown to bind CCL13.
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