Immunomodulatory effect of recombinant RNA‐dependent RNA polymerase protein of Macrobrachium rosenbergii nodavirus in giant freshwater prawn M. rosenbergii |
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| Authors: | Pramoda Kumar Sahoo Mudagandur S Shekhar Abhilipsa Das Manickam Dilli Kumar Bindu R Pillai A S Sahul Hameed |
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| Institution: | 1. Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, India;2. Genetics and Biotechnology Unit, Central Institute of Brackishwater Aquaculture, R.A. Puram, Chennai, India;3. OIE Reference Laboratory for WTD, C. Abdul Hakeem College, Melvisharam, Vellore, India |
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| Abstract: | The present study evaluated the role of recombinant RNA‐dependent RNA polymerase (RdRp) protein of Macrobrachium rosenbergii nodavirus (MrNV) in modulating the immune response and in reducing MrNV load in infected prawn. In the first experiment, prawns (25–30 g) were injected with recombinant RdRp protein (RP) at a concentration of 0, 1.0 and 10 μg, and immune parameters and expression of some immune‐related genes were measured up to 14 days post injection (p.i.). In the second experiment, early juveniles were injected with a similar dose of RdRp and animals were challenged by immersion with MrNV. The infection status was detected in muscles by nested RT‐PCR up to 21 days post challenge. Prawn injected with higher concentration of RP showed significantly higher total haemocyte count at different period post injection. Significant up‐regulation of immune‐related genes was observed within 24 h in prawn treated with lower dose of RP and after 7 days p.i. at higher level of RP injection compared with adult control. Most of the tested samples (63%) were found to be RT‐PCR positive for MrNV at 48 h of post‐immersion challenge. After 14 days, MrNV was detected only in control prawn, while both RP‐injected groups were MrNV negative. This study elucidated the potential viral load reduction role played by RdRP in MrNV‐infected prawn. |
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| Keywords: | Macrobrachium rosenbergii nodavirus (MrNV) RNA‐dependent RNA‐polymerase (RdRp) Immunomodulation
Macrobrachium rosenbergii
Virus clearance |
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