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Parasite-specific proliferative responses of chicken spleen cells upon in vitro stimulation with Eimeria tenella antigen

Published online by Cambridge University Press:  09 November 2018

Eva Wattrang*
Affiliation:
Department of Microbiology, National Veterinary Institute, SE-751 89 Uppsala, Sweden
Per Thebo
Affiliation:
Department of Microbiology, National Veterinary Institute, SE-751 89 Uppsala, Sweden
Osama Ibrahim
Affiliation:
Department of Microbiology, National Veterinary Institute, SE-751 89 Uppsala, Sweden
Tina Sørensen Dalgaard
Affiliation:
Department of Animal Science, Aarhus University, Blichers Allé 20, P.O. box 50, DK-8830, Tjele, Denmark
Anna Lundén
Affiliation:
Department of Microbiology, National Veterinary Institute, SE-751 89 Uppsala, Sweden
*
Author for correspondence: Eva Wattrang, E-mail: eva.wattrang@sva.se

Abstract

This study aimed to set up methodology to monitor parasite-specific T-cell activation in vitro using Eimeria tenella-infected chickens. A sonicated E. tenella sporozoite protein preparation was used for the activation of chicken spleen cell cultures. Proliferation assessed by 3H-thymidin incorporation or blast transformation of T-cells assessed by immunofluorescence labelling and flow cytometry were used as read-outs for activation. Results showed that E. tenella-specific proliferation was detected in cultures of spleen cells collected in a ‘window’ between 8 and 14 days after primary infection. However, due to high variation in proliferative responses between individuals and to high background proliferation, large numbers of observations were needed to obtain significant results. Moreover, the outcome was not improved by increasing the infection dose to chickens or by depletion of T-cell receptor (TCR) γ/δ expressing cells from cultures. An E. tenella-specific blast transformation response was observed for TCRα/β expressing cells within the same ‘window’, confirming the identity of the responding cells as classic T-cells. Thus, it is possible to study the kinetics of E. tenella-specific T-cell responses in vitro. However, more in-depth phenotypic identification of the responding T-cells could improve the methodology.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2018 

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