Expression of neurotransmitters and neurotrophins in human adenoid tissue.

Mucosae-associated lymphoid tissues are richly innervated and the mucosae contain peptidergic nerve endings associated with different types of cells and macrophages. The lymphatic tissue is known to interact with the nervous system and several organs, implicated in the host response to a wide range of stressors, and is also richly innervated. We focussed our attention on the immune organs with particular regard to the human adenoid lymphatic tissues in order to investigate the neuroimmune links and the possible existence of relationships among different neurotransmitters and lymphocytes, macrophages, epithelial cells and nerve fibers by testing the expression of certain neurotransmitters and neurotrophins (NTs) with their own receptors.