Abstract
Objective To investigate the effect of recombinant Vibrio vulnificus hemolysin (rVvhA) on the expression of nitric oxide(NO) and induced nitric oxide synthase(iNOS) in J774A. 1 cells.Methods The inhibitory effect of rVvhA on J774A. 1 proliferation was measured by MTF colorimetry technique. The content of nitrite in culture medium was determined by Griess reagent. The expression of iNOS protein and mRNA were measured by immunofluorescence and RT-PCR, respectively. Results The viability of J774A. 1 cells was apparently inhibited when exposed to 0.8 HU/ml rVvhA and up. With the help of IFN-γ, the expression of NO and the activity of iNOS in J774A. 1 cells were remarkably increased when exposed to 0.4 HU/ml rVvhA. Conclusion rVvhA can increase the expression of NO and iNOS, it may play an important role in the pathogenic mechanism of Vibrio vulnificus. Key words: Vibrio vulnificus; Cytolysin; J774A. 1; Nitric oxide; Induced nitric oxide synthase
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