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Research (Published online: 10-02-2015)

4. Construction and characterization of recombinant human adenovirus type 5 expressing foot-and-mouth disease virus capsid proteins of Indian vaccine strain, O/IND/R2/75 - Ramesh Kumar, B. P. Sreenivasa and R. P. Tamilselvan

Veterinary World, 8(2): 147-155

 

 

   doi: 10.14202/vetworld.2015.147-155

 

 

Ramesh Kumar: FMD Research Centre, Indian Veterinary Research Institute, Bangalore - 560 024, Karnataka, India; drrkvet13@gmail.com

B. P. Sreenivasa: FMD Research Centre, Indian Veterinary Research Institute, Bangalore - 560 024, Karnataka, India; bpsrini@gmail.com

R. P. Tamilselvan: FMD Research Centre, Indian Veterinary Research Institute, Bangalore - 560 024, Karnataka, India; mukthitamil@gmail.com

 

Received: 20-10-2014, Revised: 18-12-2014, Accepted: 27-12-2014, Published online: 10-02-2015

 

Corresponding author: B. P. Sreenivasa, e-mail: bpsrini@gmail.com


Citation: Kumar R, Sreenivasa BP, Tamilselvan RP (2015) Construction and characterization of recombinant human adenovirus type 5 expressing foot-and-mouth disease virus capsid proteins of Indian vaccine strain, O/IND/R2/75, Veterinary World, 8(2): 147-155.



Aim: Generation of recombinant human adenovirus type 5 expressing foot-and-mouth disease virus (FMDV) capsid protein genes along with full-length 2B, 3B and 3Cpro and its characterization.

Materials and Methods: FMD viral RNA isolation, cDNA synthesis, and polymerase chain reaction were performed to synthesize expression cassettes (P1-2AB3BCwt and P1-2AB3BCm) followed by cloning in pShuttle-CMV vector. Chemically competent BJ5183-AD-1 cells were transformed with the recombinant pShuttle-CMV to produce recombinant adenoviral plasmids. HEK-293 cells were transfected with the recombinant adenoviral plasmids to generate recombinant adenoviruses (hAd5/P1-2AB3BCwt and hAd5/P1-2AB3BCm). Expression of the target proteins was analyzed by sandwich ELISA and indirect immunofluorescence assay. The recombinant adenoviruses were purified and concentrated by CsCl density gradient ultracentrifugation. Growth kinetics and thermostability of the recombinant adenoviruses were compared with that of non-recombinant replication-defective adenovirus (dAd5).

Results: The recombinant adenoviruses containing capsid protein genes of the FMDV O/IND/R2/75 were generated and amplified in HEK-293 cells. The titer of the recombinant adenoviruses was approximately 108, 109.5 and 1011 TCID50/ml in supernatant media, cell lysate and CsCl purified preparation, respectively. Expression of the FMDV capsid protein was detectable in sandwich ELISA and confirmed by immunofluorescence assay. Growth kinetics of the recombinant adenoviruses did not reveal a significant difference when compared with that of dAd5. A decrement of up to 10-fold at 4C and 21-fold at 37C was recorded in the virus titers during 60 h incubation period and found to be statistically significant (p<0.01).

Conclusion: Recombinant adenoviruses expressing capsid proteins of the FMDV O/IND/R2/75 were constructed and produced in high titers. In vitro expression of the target proteins in the adenovirus vector system was detected by sandwich ELISA and immunofluorescence assay.

Keywords: foot-and-mouth disease, growth kinetics, recombinant hAd5, thermostability, virus-like particles.



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