The Enteric Nervous System and the Microenvironment of the Gut: The Translational Aspects of the Microbiome-Gut-Brain Axis

The proper functioning of the gastrointestinal tract is essential for digestion, absorption and the elimination of waste products. It protects us against pathogens, allergens and toxins, continuously monitoring and regulating the internal environment. The vast majority of these tasks are carried out by the nervous and immune systems of the gut in close cooperation by constantly adapting to internal and external stimuli, maintaining its homeostasis. In this review, we would like to summarize the most recent findings about the cytoarchitecture and functional microanatomy of the enteric nervous system and the immune microenvironment of the gut highlighting the essential role and inevitable molecular crosstalk between these two highly organized networks. Gut neuroimmunology is a rapidly evolving field and might help us to understand the etiology of inflammatory bowel disease and the systemic consequences of chronic intestinal inflammation. Finally, we also included a brief outlook to present the most recent research depicting the multifaceted role of the gut microbiome, its contribution to the gut-brain axis and human disease.