Abstract
The purpose of this study was to identify the modulatory effect of MENK on MDSCs and to investigate the relationship between this modulation and the expression of opioid receptors. Our results showed that MENK could inhibit the proliferation of MDSCs from both marine bone marrow and spleen. MENK also could promote the expression of opioid receptors MOR and DOR. MENK suppressed the PMN-MDSCs generated from splenocyte while up-regulated M-MDSCs. The stimulation of MENK increased the production of IL-4 secreted by MDSCs from slpenocytes. Our currently data indicated that MENK could suppress the accumulation of MDSCs in tumor-bearing mice via binding to and up-regulating expressions of subunits of opioid receptors. Therefore, it is concluded that MENK, through triggering opioid receptors could exert inhibiting modulation on MDSCs.
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