Abstract
Evidence for neuroendocrine regulation of the immune system is reviewed. This includes human clinical studies of the influence of psychological stress on immune function, direct experimentation in animals, including classical Pavlovian conditioning of the immune response, modulation of immune function in vitro by chemical messengers such as neuropeptides, the finding of receptors for neuropeptides on immunocytes, and the demonstration that lymphoid tissue is directly innervated. Secretory products of the immune system, which include interleukins and neuropeptides, may also influence the neuroendocrine system. Communication between the two systems is therefore bidirectional. The potential importance of the neuropeptide-immunocyte interaction within the intestinal mucosal immune system is emphasized, and its possible relevance in inflammatory disorders is discussed. This aspect of the "gut-brain" interaction deserves further study.
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