Pathways of neuro-immune communication: past and present time, clinical application

Fundamental studies in neuroimmunophysiology are the keystone for development of new therapeutic approaches to the treatment of infectious, allergic, oncologic and autoimmune diseases. The achievements in this field allowed approving new treatment methods based on irritation of afferent and efferent fibers of autonomic nerves. That became possible due to numerous studies of pathways between the immune and nervous systems performed over last two decades. The milestones in the history of neuroimmune communication research are represented here. The immune system organs – bone marrow, thymus and spleen are coupled to central nervous system (CNS) via sympathetic nerves. Information about LPS and bacteria emergence in peritoneum, intestine and parenchymal organs reaches the brain via parasympathetic pathways. After vagotomy, the brain neurons do not respond to this kind of antigens. The pattern of brain responses to different applied antigens (the EEG changes and the quantity of c-Fos-positive neurons) is specific for definite antigen, like as algorithms of electroneurogram after exposure to different cytokines. Activation of parasympathetic nerves causes the inhibition of inflammation. The entry of any antigens into the body initiates production of cytokines (IL-1, TNFα, IL-6, IFNγ etc.), via specific receptors which are present on peripheral neurons and terminals of vagus nerve, i.e. the vagal afferent terminals and neurons respond to cytokine action, and these signals are transmitted to CNS neurons. The afferent vagal fibers end on the dorsal vagal complex neurons in the caudal part of medulla oblongata. The information about bacterial antigens, LPS and inflammation is transmitted to the brain via afferent autonomic neural pathways. The speed of this process is high and significantly depends on the rates of cytokine production that are transmitters of signals upon the antigen exposure. It is important to emphasize that this events occur within minutes, and the response to the received information proceeds by reflex mechanisms, i.e., within fraction of a second, as exemplified by inflammation (“inflammation reflex”). This is a fundamentally new and revolutionary discovery in the functional studies of immune system regulation. Clinical efficiency of n. vagus stimulation by pulsed ultrasound was shown, being used for the treatment of inflammatory, allergic and autoimmune diseases, e.g., multiple sclerosis, rheumatoid arthritis, renal inflammatory diseases. Electrical stimulation of the vagus nerve reduces the death of animals in septic shock by 80%. The mentioned data have made a revolution in understanding the functional arrangement of immune system in the body. A hypothesis is represented, which suggests how the information on the antigen exposure is transmitted to the brain.

neuroimmune interactions, afferent pathways, efferent pathways, reflex, inflammation, treatment

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