D.S., Arathy and Sajith, Nair and Soja , Saghar Soman and Aneesh, Issac and E., Sreekumar (2011) Functional characterization of the CC chemokine RANTES from Pekin duck (Anas platyrhynchos). Developmental and comparative immunology, 35 (1). pp. 142-150. ISSN 1879-0089

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Abstract

RANTES (Regulated upon Activation, Normal T-cell Expressed and Secreted) is a key pro-inflammatory cytokine that belongs to the CC-group of chemokines. The present study was carried out to functionally characterize the previously identified RANTES homologue in domestic duck (GenBank Accession No. AY641435). Recombinant duck RANTES was expressed in Escherichia coli-based and HEK293T cell-based systems. A tRNA supplementation strategy was required to express the protein in E. coli due to the presence of rare codons. In biological assays using HEK293T cell-expressed protein, RANTES was found to mediate chemotaxis of DT-40 chicken B cells and primary duck splenocytes at a concentration of 0.505μg/ml (0.6μM). Immunostaining of the migrated splenocytes using anti-duck CD4 and CD8 monoclonal antibodies and subsequent flow cytometric analysis showed enhanced chemotaxis of CD8+ cells. The recombinant RANTES exhibited in vitro antiviral activity by inhibiting infection of chicken embryo fibroblast cells with duck enteritis virus (DEV) at the same concentration. The effect could be neutralized by rabbit anti-duck RANTES polyclonal serum. The mechanism seems to be direct on viral particles as evidenced by the need for co-incubation of RANTES with DEV prior to the infection for antiviral activity, and also by the enhanced binding of DEV to E. coli expressed purified RANTES on ELISA-based assays. Our results show that the duck RANTES has overlapping biological properties with its mammalian orthologue, and also has possible functional cross-reactivity with chicken immune cells indicated by the chemotaxis of DT-40 cells.

Item Type:	Article
Uncontrolled Keywords:	Duck plague; Herpes virus; RANTES; mRNA; Avian influenza
Subjects:	Molecular Virology
Depositing User:	Central Library RGCB
Date Deposited:	24 Apr 2017 08:23
Last Modified:	24 Apr 2017 08:23
URI:	http://rgcb.sciencecentral.in/id/eprint/349

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