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描述:
CCL23, also known as MPIF-1, Ckβ8 and MIP-3, is a member of the CC chemokine subfamily
that is designated CCL23. Alternative splicing of the CCL23 gene results in two mRNAs that
encode a short (Ckβ8) and a long (Ckβ8-1) isoform of the chemokine. Ckβ8 cDNA encodes
a 120 amino acid (aa) residue precursor protein with a putative 21 aa residue signal peptide
that is cleaved to generate a 99 aa residue mature Ckβ8 (aa 22 -120). Additional Nterminal
processing of the 99 aa residue variant can generate a 75 aa residue Ckβ8 (aa 46 -120) that is
significantly more active than the 99 aa residue variant. Similarly, Ckβ81 encodes a 137 aa
residue precursor protein that can give rise to a 116 and a 92 aa residue chemokine. Among
CC chemokine members, CCL23 is most closely related to MIP5/CCL15 (67% sequence identity)
and MIP1α/CCL3 (51%). CCL23 mRNA is most abundant in the adult lung and liver, but is also
present in bone marrow, placenta, and various myelomonocytic cell lines. CCL23 has been
shown to suppress the low proliferative potential colonyforming cells that give rise to
granulocyte and monocyte lineages. CCL23 binds to CCR1 with high affinity and has been
shown to be a potent chemoattractant and activator of monocytes, dendritic cells,
osteoclast precursors.
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