Abstract:
:To improve the efficacy of WSSV protection, multimeric (tetrameric) recombinant VP28 (4XrVP28) was produced and tested in comparison with those of monomeric VP28 (1XrVP28). In vitro binding of either 1XrVP28 or 4XrVP28 to shrimp hemocyte surface was evident as early as 10 min after protein inoculation. Similar results were obtained in vivo when shrimp were injected with recombinant proteins that the proteins bound to the hemocyte surface could be detected since 5 min after injection. Comparison of the WSSV protection efficiencies of 1XrVP28 or 4XrVP28 were performed by injection the purified 1XrVP28 or 4XrVP28 (22.5 μg/shrimp) and WSSV inoculum (1000 copies/shrimp) into shrimp. At 10 dpi, while shrimp injected with WSSV inoculum reached 100% mortality, shrimp injected with 1XrVP28 + WSSV or 4XrVP28 + WSSV showed relative percent survival (RPS) of 67% and 81%, respectively. PCR quantification revealed high number of WSSV in the moribund shrimp of WSSV- and 1XrVP28+WSSV-injected group. In contrast, lower number of WSSV copies were found in the survivors both from 1XrVP28+WSSV- or 4XrVP28+WSSV- injected groups. Histopathological analysis demonstrated the WSSV infected lesions found in the moribund from WSSV-infected group and 1XrVP28+WSSV-injected group, but less or none in the survivors. ELISA demonstrated that 4XrVP28 exhibited higher affinity binding to rPmRab7, a WSSV binding protein essential for WSSV entry to the cell than 1XrVP28. Taken together, the protection against WSSV in shrimp could be improved by application of multimeric rVP28.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Taengchaiyaphum S,Nakayama H,Srisala J,Khiev R,Aldama-Cano DJ,Thitamadee S,Sritunyalucksana Kdoi
10.1016/j.dci.2017.05.016subject
Has Abstractpub_date
2017-11-01 00:00:00pages
56-64eissn
0145-305Xissn
1879-0089pii
S0145-305X(17)30100-3journal_volume
76pub_type
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