Bioelectronic device for screening psychobiotic effects in in-vitro human gastrointestinal tract neuro-immune models with epithelium derived from patient organoids

The gut microbiome plays a vital role in human health, especially through the gut–brain axis—a communication network between the gastrointestinal (GI) tract and the nervous system. This link involves the vagus nerve, immune system, and metabolites produced by gut bacteria. A group of microbes called psychobiotics may positively influence brain function. However, identifying these microbes and understanding how they affect the nervous system remains a challenge due to the lack of suitable human-based models.This project aims to develop a bioelectronic in-vitro model of the human gut–brain axis that can screen psychobiotic bacteria and monitor how they influence biological communication. The first step involves creating a gut-lining model using human-derived cells that form a realistic intestinal barrier, including key cells involved in signaling to the nervous system. The model’s structure and function will be assessed using methods that monitor barrier integrity and cellular responses. Next, defined bacterial strains and fecal-derived communities will be introduced into the system under gut-like, low-oxygen conditions. Their impact on epithelial health and signaling will be analyzed through real-time monitoring of redox and electrical changes. This step will identify bacteria that produce beneficial compounds and influence local gut environments. Electrochemical sensors will allow label-free, real-time tracking of changes in tissue health and bacterial activity. Finally, neuron-like and immune cells will be added to the model to simulate how gut signals influence neural activity and immune responses. This fully integrated system will offer a human-relevant platform for understanding microbiome–host interactions in health and disease. It will also help reveal how psychobiotic microbes affect the gut–brain connection and support the development of microbiome-based therapies for gastrointestinal, neurological, and psychological conditions.