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Journal of Korean Neurosurgical Society 1995;24(12): 1455-1462. |
| The Effect of Phorbol Myristate Actate on the Synthesis of Nitric Oxide in Murine Microglial Cells. |
| Gyoo Nam Rim, Jong Moon Kim, Hun Taeg Chung |
1Department of Neurosurgery, School of Medicine, Wonkwang University, Iri, Korea.
2Department of Microbiology & Immunoloy, School of Medicine, Wonkwang University, Iri, Korea. |
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| ABSTRACT |
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In this study, the effect of phorbol ester on the synthesis of nitric oxide(NO) in murine microglial cells was examined.
Phorbol 12-myristate 13-acetate(PMA), a protein kinase C(PKC) activator, alone had no effect, whereas PMA with recombinant interferon-gamma(rIFN-gamma) synergistically increased NO synthesis in murine microglial cells. The maximal effect of PMA in the increase of NO synthesis always fit with the range for rull activation of PKC in these cells. The increase of NO synthesis was reflected as increased amount of inducible NO synthase(iNOS) mRNA by Northern blotting. Treatment of PKC inhibitors such as staurosporine(STSN) or polymxin B decreased rIFN-gamma plus PMA-stimulated NO synthesis. Further, prolonged incubation of the cells with PMA, which down regulate PKC activity, abolished synergistic cooperative effect with IFN-gamma.
N(G)-monomethyl-L arginine monohydrate(NGMMA), an analogue of L-arginine, and arginase inhibited rIFN-gamma plus PMA-induced NO production in murine microglial cells. On the basis of these observations we conclude that PKC might not be involved in the expression of iNOS, but instead, might be involved in the post-transcriptional modification of iNOS mRNA. |
| Key Words:
Microglia; Astrocyte; Nitric oxide; Protein kinase C; Inducible nitric oxide synthase |
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