The Journal of Immunology, Vol 159, Issue 12 5787-5794, Copyright © 1997 by American Association of Immunologists

ARTICLES

Evidence that the same gamma delta T cells respond during infection- induced and autoimmune inflammation

A Mukasa, M Lahn, EK Pflum, W Born and RL O'Brien
National Jewish Medical and Research Center, Denver, CO 80206, USA. musasaa@njc.org

Inflammatory responses are induced in both testes of a mouse following injection of Listeria monocytogenes into one testis. Although the uninjected testis contains no detectable bacteria, it undergoes an autoimmune attack. Normally, the testis lacks lymphocytes, but in the infected and autoimmune state, both gamma delta and alpha beta T cells are found as infiltrates. Here, we have examined the repertoire of the infiltrating gamma delta T cells, using two different methods, and found a high frequency of V gamma 6/V delta 1 gamma delta T cells in both infected and autoimmune testes. All of these expressed the invariant V gamma 6/V delta 1 TCR previously reported. However, secondary gamma and delta transcripts present within V gamma 6/V delta 1 hybridomas indicated nonclonality. Interestingly, some of these secondary transcripts were derived from gamma gene rearrangements not previously found in this gamma delta T cell subset, implying a difference in its origin. The increase in V gamma 6/V delta 1 cells observed here in both infected and autoimmune testes, together with our previous finding of a preferential response by the same subset in Listeria-infected liver, indicates that their response is triggered by the inflammation rather than by the infectious agent or because they are already resident in the tissue. We and others have previously reported that the presence of gamma delta T cells during certain inflammatory conditions correlates with less host tissue damage. This result, together with the evidence presented here, further implies that a response by the V gamma 6/V delta 1 subset in some way exerts a controlling influence on the host inflammatory response.

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