Question

Which class of induction immunosuppressive agents achieves its primary effect by rapidly depleting T-lymphocytes to prevent early graft rejection?

Accepted Answer

The class of induction immunosuppressive agents that achieves its primary effect by rapidly depleting T-lymphocytes to prevent early graft rejection is lymphocyte-depleting antibodies. These agents are used in induction immunosuppression, an intensive initial treatment given at the time of organ transplantation to aggressively suppress the immune system and prevent acute rejection. T-lymphocytes, or T-cells, are a type of white blood cell central to cell-mediated immunity and the primary drivers of graft rejection, which is the immune system&#x27;s attack on the transplanted organ, known as an allograft. Lymphocyte-depleting antibodies function by binding to specific surface markers on T-lymphocytes, triggering mechanisms like complement-dependent cytotoxicity and antibody-dependent cell-mediated cytotoxicity. These processes lead to the rapid destruction and removal, or depletion, of T-lymphocytes from the recipient&#x27;s circulation. By significantly reducing the number of these immune cells, the agents prevent the recipient&#x27;s immune system from mounting an immediate, strong attack against the new organ. This class encompasses both polyclonal antibodies, such as anti-thymocyte globulin (ATG), which contain various antibodies targeting multiple T-cell antigens, and monoclonal antibodies, such as alemtuzumab, which are engineered to precisely target a single specific antigen, like CD52 on T-lymphocytes, thereby achieving highly effective T-cell depletion.

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Which class of induction immunosuppressive agents achieves its primary effect by rapidly depleting T-lymphocytes to prevent early graft rejection?