Ma W, Mishra S, Gee K, Mishra JP, Nandan D, Reiner NE, Angel JB, Kumar A. Cyclosporin A and FK506 inhibit IL-12p40 production through the calmodulin/calmodulin-dependent protein kinase-activated phosphoinositide 3-kinase in lipopolysaccharide-stimulated human monocytic cells.
J Biol Chem 2007;
282:13351-62. [PMID:
17347151 DOI:
10.1074/jbc.m611522200]
[Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cyclosporine-A (CyA) and FK506 are potent immunosuppressive agents because of their ability to suppress the production of Th1 cytokines including interleukin (IL)-12. However, the mechanisms underlying the inhibitory effects of CyA and FK506 on the production of IL-12p40, a critical component of IL-12, remain unknown. Both CyA and FK506 are potent inhibitors of calcineurin in the calcium signaling pathway. Interestingly, calcium and phosphoinositide 3-kinase (PI3K) signaling pathways have been shown to negatively regulate lipopolysaccharide (LPS)-induced murine IL-12p40 production. Contrary to these observations, we show that LPS-induced IL-12p40 production in human monocytic cells is positively regulated by the calcium pathway and in particular by calmodulin-(CaM) and CaM-dependent protein kinase-II (CaMK-II)-activated PI3K. Furthermore, LPS-induced IL-12p40 production was regulated by the p110alpha catalytic subunit of PI3K. Moreover, LPS induced IL-12p40 production through the CaM/CaMK-II-activated NFkappaB and AP-1 transcription factors. LPS-induced IL-12p40 production is known to be regulated by the c-Jun N-terminal kinase (JNK) pathway. Importantly, both CyA and FK506 down-regulated LPS-induced IL-12p40 transcription by inhibiting CaM/CaMK-II-activated PI3K and their downstream transcription factors NFkappaB and AP-1 independent of the JNK pathway.
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