Calcitonin gene-related peptide is a key neurotransmitter in the neuro-immune axis

• Published in: Frontiers in neuroscience Vol. 8; p. 23
• Main Authors: Assas, Bakri M, Pennock, Joanne I, Miyan, Jaleel A
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Research Foundation 14.02.2014; Frontiers Media S.A
• Subjects: Bone marrow; C fibres; Calcitonin; Calcitonin gene-related peptide; CGRP; Cytokines; Dendritic cells; Endocrinology; Fibers; Gene expression; Geographical variations; gut-brain axis; Kinases; Lymphocytes; Macrophages; Mast cells; Nervous system; neuroimmunology; Neurons; Neuropeptides; Pain; Peptides; Physiology; Sensory neurons; tNF-alpha; TRPV1; Tumor necrosis factor-TNF; Wound healing; United Kingdom > UK; neuroimmunology; TRPV1; TNF-alpha; CGRP; C fibers; gut-brain axis
• ISSN: 1662-4548; 1662-453X; 1662-453X
• DOI: 10.3389/fnins.2014.00023

The question of how the neural and immune systems interact in host defense is important, integrating a system that senses the whole body with one that protects. Understanding the mechanisms and routes of control could produce novel and powerful ways of promoting and enhancing normal functions as well as preventing or treating abnormal functions. Fragmentation of biological research into specialities has resulted in some failures in recognizing and understanding interactions across different systems and this is most striking across immunology, hematology, and neuroscience. This reductionist approach does not allow understanding of the in vivo orchestrated response generated through integration of all systems. However, many factors make the understanding of multisystem cross-talk in response to a threat difficult, for instance the nervous and immune systems share communication molecules and receptors for a wide range of physiological signals. But, it is clear that physical, hard-wired connections exist between the two systems, with the key link involving sensory, unmyelinated nerve fibers (c fibers) containing the neuropeptide calcitonin gene-related peptide (CGRP), and modified macrophages, mast cells and other immune and host defense cells in various locations throughout the body. In this review we will therefore focus on the induction of CGRP and its key role in the neuroimmune axis.