Analysis of Ehelichia ruminantium-specific T1/T2 responses during vaccination with a protective killed vaccine and challenge of goats

Esteves Isabel, Vachiery Nathalie, Martinez Dominique, Totté Philippe. 2004. Analysis of Ehelichia ruminantium-specific T1/T2 responses during vaccination with a protective killed vaccine and challenge of goats. Parasite Immunology, 26 : 95-103.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Ehrlichia ruminantium is an obligate intracellular bacterium that causes heartwater in ruminants and for which T-cellmediated immunity is believed to play an important role in protection. To better characterize protective cellular immunity E. ruminantium-specific IFN-[gamma] and IL-4 recall responses in major T-cell subsets were analysed by flow cytometry during immunization of goats with a killed vaccine and following a virulent challenge. The killed vaccine elicited both CD8+ and CD4+ subsets to produce cytoplasmic IFN-[gamma] in the absence of IL-4, thus indicating a biased Tl response. The relative capacity of CD8+ T-cells to produce IFN-[gamma] was significantly higher than CD4+ T-cells but the final contribution of both subsets was comparable. Circulating ER-specific CD4 and CD8 effectors substantially decreased in numbers after the booster injection and could not be detected in most animals during challenge, which warrants further investigation in immune compartments other than blood. Since IFN-[gamma] inhibits the growth of the pathogen in target cells, the information provided in this study on E. ruminantium-specific T1 responses will be valuable to develop cellular tools for the identification of potential protective antigens.

Mots-clés Agrovoc : Ehrlichia, ruminant, vaccin, immunologie, chèvre, réponse immunitaire

Classification Agris : L50 - Physiologie et biochimie animales

Auteurs et affiliations

• Esteves Isabel
• Vachiery Nathalie, CIRAD-EMVT-SANTE ANIMALE (GLP)
• Martinez Dominique, CIRAD-EMVT-SANTE ANIMALE (GLP)
• Totté Philippe, CIRAD-EMVT-SANTE ANIMALE (GLP)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/522508/)

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