Start Date: Sep 01, 2011
End Date: Aug 31, 2016
Our labs have shown that bovine gamma delta T cells expressing the immune co-receptor WC1 (WC1+ gamma delta T cells) are activated in response to Mycobacterium and Leptospira. WC1 is part of the scavenger receptor family known as CD163 which includes CD163A, CD163b and CD163c-a in humans. The mechanism of activation of gamma delta T cells in all mammalian species including humans via the gamma delta T cell receptor (TCR) and co-receptors remains largely enigmatic. However we have previously shown that the cell surface glycoproteins belonging to the WC1 family of receptors act as activating co-receptors in conjunction with the TCR. The bovine genome contains approximately fourteen WC1 genes and we have shown that two of these WC1 gene products contribute to the bovine gamma delta T cell response to Leptospira; another two have been implicated in the bovine gamma delta T cell response to Anaplasma by others. We hypothesize that specific domains of CD163/WC1 gene products bind various bacteria and their products and once elucidated can be exploited to develop vaccines in both species (humans and cattle).