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Cytolytic activity and associated serine protease expression by skin and afferent lymph CD8⁺ T cells during orf virus reinfection

¹ Moredun Research Institute, 408 Gilmerton Road, Edinburgh, EH17 7JH, Scotland
and² Centre for HIV Research, Division of Biological Sciences, University of Edinburgh, Scotland, UK

Following orf virus reinfection in sheep, CD8⁺ T cells were recruited to the lesion site in the skin during the period of viral replication and appeared in increased numbers in afferent lymph draining the infection site. A proportion of the CD8⁺ T cells were activated, particularly in the skin, as determined by their expression of the cytolytic cell-associated serine protease, BLT-esterase. This was a useful marker for activated cytolytic cells as there was a good correlation between afferent lymph CD8⁺ T cell-mediated lysis of autologous orf virus-infected skin cells and their expression of BLT-esterase in vitro. The majority of the cells that expressed BLT-esterase in the skin and lymph were CD8⁺ T cells and cytolysis in vitro was predominately by the MHC class I antigen presentation pathway. The conclusion is that orf virus reinfection is characterized by limited viral replication and stimulation of an activated CTL response in the skin.

^* Author for correspondence. Fax +44 131 664 8001. e-mail Haigd@mri.sari.ac.uk

Received 20 October 1995; accepted 22 December 1995.

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