Vet Immunol Immunopathol. 2003 Jun 20;93(3-4):169-76.

The role of WC1(+) gamma delta T-cells in the delayed-type hypersensitivity (DTH) skin-test reaction of Mycobacterium bovis-infected cattle.

Kennedy HE, Welsh MD, Cassidy JP, Bryson DG, Forster F, McNair J, Gangadharan B, Howard CJ, Pollock JM.

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Department of Veterinary Science, Queen's University, Belfast, UK.

Abstract

Delayed-type hypersensitivity (DTH) skin-testing with mycobacterial antigens is often used as a means of identifying Mycobacterium bovis-infected cattle. Better understanding of the cellular basis underlying the DTH reaction is required if diagnostic methods are to be improved upon. Previous studies have shown that gamma delta T-cells, particularly those bearing the WC1 molecule, are present at an early stage of developing DTH responses and that such cells may modulate the developing immune response immediately following M. bovis-infection. However, their role, if any, in the DTH response remains unclear. In the present study we have used an in vivo model to deplete WC1(+) gamma delta T-cells, from cattle with established M. bovis-infection, prior to skin-testing. Results indicate that, although WC1(+) gamma delta T-cells do infiltrate the skin-test site in normal calves, they do not appear to be essential for the development of DTH skin swelling, as indicated by effective development of skin responses in calves depleted of circulating WC1(+) gamma delta T-cells.

PMID:: 12814702; [PubMed - indexed for MEDLINE]

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