microRNA–Microbiota–Cytokine Triad: Experimental Dissection of Feedback Loops in the Gut–Brain Axis

Sharma et al. (2025) propose a rich, underexplored field: miRNAs mediate crosstalk between gut microbes, immune signaling, and the brain. But most work is either correlative or focuses on one direction (e.g., how microbiota alter miRNA expression). This project would use gnotobiotic mice, miRNA mimics/inhibitors, and cytokine blockers to experimentally manipulate each node (miRNAs, microbes, cytokines) and dissect causal feedback loops. Integrating omics (metagenomics, miRNome, cytokine proteomics) would allow mapping of how changes at one level ripple through the system. This could yield unprecedented insight into neuroimmune regulation, identify new biomarkers for depression or other disorders, and suggest novel combinatorial therapies (e.g., pairing probiotics with miRNA modulators).

References:

1. Bridging Mind and Gut: The Molecular Mechanisms of microRNA, Microbiota, and Cytokine Interactions in Depression.. Himanshu Sharma, Abdullah Al Noman, Iftakhar Ahmad, Susmita Deb Tonni, Tasmia Jahin Mim, Fahmida Afrose, Pranab Dev Sharma, Anwar Parvez, Samanta Tamanna, Md Al Azad, Rashmi Pathak (2025). Current Gene Therapy.