Abstract:
:NKG2D receptor-ligand interaction triggers NK cell-mediated cytolysis and IFN-gamma secretion. IFN-gamma produced by NK cells has been found to promote the interaction between NK cells and monocytes; however, the underlying mechanism remains elusive. We demonstrate here that IFN-gamma exclusively induced or upregulated the expression of MHC class I chain-related (MIC) molecules, which are ligands of the NKG2D receptor, on the surface of human monocytes of the PBMC population. The IFN-gamma-induced MIC molecules on monocytes played an essential role in triggering the activation of NK cells because mAb-mediated masking of the MIC molecules and the inhibition of cell-to-cell contact using transwell inserts significantly abolished NK cell activation. Meanwhile, membrane-bound IL-15 (mIL-15) was concomitantly induced with MIC molecules on IFN-gamma-treated monocytes and played an essential role in protecting NK cells cocultured with monocytes from MIC-induced NKG2D down-modulation. Therefore, we conclude that the IFN-gamma-induced MIC molecules participated in monocyte/NK cell interaction and that this interaction also involved mIL-15.
journal_name
Mol Immunoljournal_title
Molecular immunologyauthors
Wang H,Ruan Z,Wang Y,Han J,Fu X,Zhao T,Yang D,Xu W,Yang Z,Wang L,Chen Y,Wu Ydoi
10.1016/j.molimm.2007.10.007subject
Has Abstractpub_date
2008-03-01 00:00:00pages
1548-56issue
6eissn
0161-5890issn
1872-9142pii
S0161-5890(07)00801-2journal_volume
45pub_type
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