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Lentiviral-mediated delivery of classical swine fever virus Erns gene into porcine kidney-15 cells for production of recombinant ELISA diagnostic antigen

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Abstract

Classical swine fever virus (CSFV), a member of the Pestivirus genus within the Flaviviridae family causes contagious fatal disease in swine. Antibodies against E2, Erns and NS3 proteins of virus can be detected in infected animals. Development of an ELISA coating antigen to improve the sensitivity of detecting Erns-specific antibodies in pig sera is always desirable for diagnosis as well as for differentiation of infected from vaccinated animals. In present study, a lentivirus-based gene delivery system was used to develop a stable PK-15 cell line expressing Erns (PK-Erns) for production of diagnostic antigen. The Lenti-Erns virus was purified from the supernatant of co-transfected 293LTV cells and used to transduce PK-15 cells. The homogenous PK-Erns cell line was produced by single cell cloning by monitoring eGFP expression. The Erns gene in the genomic DNA and RNA transcripts in total RNA isolated from PK-Erns cells were detected by PCR and RT-PCR, respectively. Expression of 45 kDa Erns glycoprotein was detected in western blot using CSFV-specific hyperimmune sera. The use of PK-Erns cell lysate as antigen in serial dilution and single dilution ELISAs with known positive and negative pig sera was investigated. The PK-Erns ELISA revealed sensitivity equivalent to commercial HerdChek ELISA kit. The sensitivity, specificity and accuracy of the PK-Erns ELISA was 95%, 100% and 96.66%, respectively compared to ELISA using purified CSFV as coating antigen. When field pig sera (n = 69) were tested in PK-Erns ELISA, a significant correlation between the titers from serial dilution and single dilution ELISA was observed. This indicated that PK-Erns cell line can serve as continuous source of ELISA diagnostic antigen for detection of CSFV-specific antibodies in pig sera.

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Acknowledgements

This work was supported by grant BT/PR16025/NER/95/52/2015 from the Department of Biotechnology, Government of India.

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Correspondence to Praveen K. Gupta.

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11033_2019_4829_MOESM1_ESM.jpg

Supplementary Fig. 1. Optimization of concentration of PK-Erns cell lysate as ELISA coating antigen. The absorbance values of 1:200 (A) and 1:1000 (B) diluted known positive and negative sera samples were plotted against different concentrations of PK-Erns whole cell lysate as coating antigen. The concentration of coating antigen showing maximum absorbance and positive-to-negative ratio was selected (JPEG 55 kb)

11033_2019_4829_MOESM2_ESM.jpg

Supplementary Fig. 2. Determination of correlation coefficient between absorbance and observed ELISA titer of known positive sera using the serial dilution method. The absorbance values of different dilutions of known positive sera samples (n = 9) were plotted against log10 reciprocal of serum dilutions. The correlation coefficient (r2) at each serum dilution was analysed and presented as straight line. The serum dilution demonstrating highest correlation coefficient was selected for calculation of constants like, slope and intercept for the regression equation and calculation of predicted ELISA titer (JPEG 59 kb)

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Bhattacharya, S., Saini, M., Bisht, D. et al. Lentiviral-mediated delivery of classical swine fever virus Erns gene into porcine kidney-15 cells for production of recombinant ELISA diagnostic antigen. Mol Biol Rep 46, 3865–3876 (2019). https://doi.org/10.1007/s11033-019-04829-0

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