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描述:
CCL4, also known as macrophage inflammatory protein 1 beta (MIP-1β) is a 7.8 kDa β
chemokine that is secreted at sites of inflammation by activated leukocytes, lymphocytes,
vascular endothelial cells, and pulmonary smooth muscle cells. CCL4 attracts a variety of
immune cells to sites of microbial infection as well as to other pathologic inflammation
such as allergic asthma and ischemic myocardium. A CCL4 deficiency in mice promotes the
development of autoantibodies, possibly as a result of compromised regulatory T cell
recruitment. CCL4 is secreted from activated monocytes as a heterodimer with CCL3/
MIP1α. The first two Nterminal amino acids can be cleaved from human CCL4 by CD26/
DPPIV. Both the full length and truncated forms exert biological activity through CCR5, and
the truncated form additionally interacts with CCR1 and CCR2b. In humans, the ability of
CCL4 to bind CCR5 inhibits the cellular entry of M-tropic HIV-1 which utilizes CCR5 as a
coreceptor. Both forms of CCL4 block HIV1 infection of T cells by inducing the downregulation
of CCR5. Mature human CCL4 shares 77% and 80% aa sequence identity with mouse and
rat CCL4, respectively.
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