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- W2076216475 abstract "Calcineurin (CN), a unique Ca2+/calmodulin (CaM)-dependent serine/threonine protein phosphatase, plays a pivotal role in the activation and proliferation of T lymphocytes. Based on the effective molecular screening model established in our laboratory, we found that a part of polysaccharides from the stem and leaves of Panax ginseng, termed PGP-SL, could activate CN activity. Subsequently, we investigated whether PGP-SL also has immunological competence on murine spleen lymphocytes. In the present study, we demonstrated that PGP-SL could significantly promote in vitro spleen lymphocyte proliferation in the absence of either concanavalin A or LPS in a concentration-dependent manner at concentrations ranging from 100 to 500 microg/ml (p<0.001). In addition, the proliferation of cyclosporin A (CsA)-treated spleen lymphocytes was also significantly promoted in the same pattern (p<0.001); the production of IL-2 was elevated and the effect appeared as early as 24 h after PGP-SL treatment. The results of RT-PCR also indicated that the IL-2 mRNA level was markedly enhanced, particularly at PGP-SL concentrations of 300 and 500 microg/ml, and Fura-2/AM fluorescence probe analysis showed that PGP-SL could dramatically increase the intracellular free calcium concentration of spleen lymphocytes, i.e. [Ca2+]i was significantly increased by approximately 181 and 107% at 300 and 500 microg/ml of PGP-SL, respectively. However, this effect could be totally inhibited by verapamil treatment. Taking our results together, we suggest that PGP-SL exhibits immunopotentiation effects on murine spleen lymphocytes by the Ca2+-CN-NFAT-IL-2 signaling pathway." @default.
- W2076216475 created "2016-06-24" @default.
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- W2076216475 date "2010-04-01" @default.
- W2076216475 modified "2023-10-16" @default.
- W2076216475 title "Immunopotentiation on murine spleen lymphocytes induced by polysaccharide fraction ofPanax ginsengvia upregulating calcineurin activity" @default.
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- W2076216475 doi "https://doi.org/10.1111/j.1600-0463.2010.02589.x" @default.
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