Abstract
Non-major histocompatibility complex (MHC) restricted cytotoxicity is an important part of the immune reaction mounted in response to bovine herpes virus type 1 (BHV-1) infection. In this study, we evaluated the effect of BHV-1 infection on the ability of lung parenchyma leucocytes (LPL), cranial tracheobronchial lymph node cells (BLNC) and peripheral blood mononuclear leucocytes (PBML) to mediate this function. While LPL from non-infected calves mediated cytotoxicity against BHV-1-infected cells, a similar activity could not be detected in PBML or BLNC. In contrast, both LPL and PBML from naive calves could mediate cytotoxicity against K562 target cells but only after activation with interleukin-2 (IL-2). BLNC were unable to kill K562 cells. Infection of calves with BHV-1 enhanced the ability of LPL and PBML to kill BHV-1-infected cells. This enhancement was detected as early as Day 1 after infection in LPL whereas it could only be detected in PBML 8 days after infection. The results demonstrate that the leucocyte population present at the site of infection was able to mediate a potentially important antiviral function and that this function was enhanced rapidly in response to infection. Thus LPL-mediated cytotoxicity may be an important mechanism for the recovery from BHV-1 infection.
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