Understanding the rapid expression of lymphocyte activation gene 3 (LAG-3) on healthy human T cells
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Date
2015
Authors
Stalker, Andrew
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Abstract
LAG-3 is an immune inhibitory marker. These immune inhibitory markers function to reduce the capability of immune cells to elicit a proper immune response and to help maintain tolerance. During an acute infection, these markers assist in controlling the immune system, however, during a chronic infection these markers prevent the immune response from persisting to effectively fight the disease. Contrary to other immune inhibitory markers, LAG-3 is not highly expressed on T cells during chronic viral infections, such as HIV.
The majority of information available on LAG-3 has been gained from murine models and cell lines. This thesis uses primary human T cells in order to observe rapid expression of surface LAG-3 from a pre-formed intracellular store and cleavage of these surface molecules into soluble variants by matrix metalloprotease cleavage. LAG-3 and sLAG-3 expression is compared with CD69 and cytokine expression to help understand the early immune response.
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Keywords
LAG-3, Immunology, T cells, CD4, CD3, HIV