Abstract
Dendritic cells (DCs) play a critical role in capturing and presenting inhaled antigens to T lymphocytes. We report that pulmonary DCs in the Lewis rat are normally located in the lung in immediate proximity to nerve fibers that contain immunoreactive substance P (SP). Functionally, pulmonary DCs bound 125I-SP and displayed increased motility in vitro in response to graded concentrations of SP. However, SP had no effect on the accessory cell activities of DCs. To examine the role of neural influences on the pulmonary immune response to inhaled antigen, Lewis rats were pretreated with capsaicin (CAP), which damages small nerves and depletes neuropeptide stores, and then challenged intratracheally (i.t.) with hen egg lysozyme (HEL). The number and antigen-presenting cell activities of pulmonary DCs in the CAP-treated rats were comparable to those of controls up to day 14. T lymphocytes harvested from the regional lymph nodes draining the lung were effectively sensitized to HEL in both groups. However, when CAP-treated rats sensitized to HEL i.t. at day 0 were rechallenged with HEL i.t. at day 14, the lungs showed decreased numbers of OX-6+ DCs and diminished pulmonary lymphoid infiltrates compared with controls. We suggest that CAP interferes with a neural-mediated response that contributes to the accumulation of inflammatory cells during the efferent limb of the pulmonary-cell-mediated immune response in vivo.
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