Abstract
In this study, we particularly evaluated the protective effect of recombinant protein encoded by Brucella abortus 544 ndk (nucleoside diphosphate kinase) gene against B. abortus infection in the BALB/c mice. Cloning and expression of B. abortus Ndk was accomplished by PCR amplification into a pMAL expression system, and purification of a recombinant Ndk (rNdk). As for the determination of IgG responses, rNdk induced vigorous IgG production, especially higher in IgG2a compared to IgG1 with titers of 5.2 and 4.8, respectively, whereas titers of these in mice immunized with MBP were 2.4 of IgG2a and 2.6 of IgG1. The analysis of cytokine has revealed that rNdk can strongly induce production of IFN-γ as well as proinflammatory cytokines (TNF, MCP1 and IL-6) but not much IL-10, suggesting rNdk elicited predominantly cell-mediated immune responses. Furthermore, the spleen proliferation and bacterial burden in the spleen of rNdk immunized mice were significantly lower than those of MBP-immunized mice against virulent B. abortus challenge (P < 0.01). Conclusionly, rNdk immunization enables to elicit both of the humoral and cellular response, ultimately enhancing protection level in experimental mice, suggesting that rNdk of B. abortus m...Continue Reading
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