One of the biggest challenges to treating infectious diseases and developing preventive vaccines is the ability of many chronic infections to suppress the immune T-cell response over time.
An Emory-led team of scientists has discovered one important way in which chronic viral infections are able to evade the immune response. The research is reported this week online in the Proceedings of the National Academy of Sciences.
Using a mouse model, the scientists found that a chronic strain of lymphocytic choriomeningitis virus (LCMV) targeted a type of stromal cells in the lymphoid organs called fibroblastic reticular cells (FRC). In contrast, an acute strain of the virus had little effect on the FRC cells. FRC provide a three-dimensional framework used by immune cells to travel and interact with other immune cells within the lymphoid organs (spleen and lymph nodes). These FRC are important for the initiation of immune responses to infections. The researchers found that widespread infection of the FRC caused a disruption of the function of these important stromal cells.
Last year a group of Emory scientists led by Rafi Ahmed, PhD, and graduate student Daniel Barber and their colleagues discovered in mice another way in which the immune reaction to chronic infections is blocked -- a pathway called PD-1 that blocked the response to the chronic strain of LCMV.