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Characterization of a glycine-rich protein from Rhipicephalus microplus: tissue expression, gene silencing and immune recognition

Published online by Cambridge University Press:  16 November 2017

B. F. Leal ,
M. F. Alzugaray ,
A. Seixas ,
I. Da Silva Vaz Jr  and
C. A. S. Ferreira Open the ORCID record for C. A. S. Ferreira [Opens in a new window]
B. F. Leal
Affiliation:
Laboratório de Imunologia e Microbiologia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga, 6681, 90619-900, Porto Alegre, RS, Brazil
M. F. Alzugaray
Affiliation:
Laboratório de Imunologia Aplicada à Saúde Animal, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, 91501-970, Porto Alegre, RS, Brazil Departamento de Microbiología, Universidad de la Republica, Alberto Lasplaces 1550 a 1620, 11600 Montevideo, Uruguay
A. Seixas
Affiliation:
Departamento de Farmacociências, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Rua Sarmento Leite, 245, 90050-170, Porto Alegre, RS, Brazil
I. Da Silva Vaz Jr
Affiliation:
Laboratório de Imunologia Aplicada à Saúde Animal, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, 91501-970, Porto Alegre, RS, Brazil
C. A. S. Ferreira*
Affiliation:
Laboratório de Imunologia e Microbiologia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga, 6681, 90619-900, Porto Alegre, RS, Brazil
*
Author for correspondence: C. A. S. Ferreira, E-mail: [email protected]
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Abstract

Salivary molecules, as glycine-rich proteins (GRPs), are essential to tick attachment and feeding on the host and are suggested to be involved in the host's immune system evasion, therefore representing natural candidates in the search for protective vaccine antigens. This work shows the molecular characterization of a GRP from Rhipicephalus microplus (RmGRP). The cDNA and putative amino acid sequences were analysed, as well as the transcription level in tick tissues/developmental stages, showing the highest levels of gene expression in 1-day-old larvae and salivary glands of fully engorged females. RmGRP gene silencing resulted in a lower hatching rate of larvae from treated females. In addition, recombinant RmGRP (rRmGRP) was recognized by sera from naturally and experimentally infested bovines, displaying considerable differences among the individuals tested. rRmGRP was recognized by anti-saliva and anti-salivary glands sera, while anti-rRmGRP serum recognized RmGRP in saliva and salivary glands, indicating its secretion into the host. The data collected indicate that RmGRP may present roles other than in the tick–host relationship, especially in embryo development. In addition, the high expression in adult females, antigenicity and presence of shared characteristics with other tick protective GRPs turns RmGRP a potential candidate to compose an anti-tick vaccine cocktail.

Keywords

Glycine-rich proteinRhipicephalus microplusRNA interferenceSalivary antigenTick-bovine relationship.
Type
Research Article
Information
Parasitology , Volume 145 , Issue 7 , June 2018 , pp. 927 - 938
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Copyright © Cambridge University Press 2017 

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