Involvement of Microbiome Gut –Brain Axis in Neuroprotective Effect of Quercetin in Mouse Model of Repeated Mild Traumatic Brain Injury

AbstractRepeated mild traumatic brain injury (rmTBI) poses adversity in the form of neurological deficits. The ignition of long-term neurological aberrations post-TBI is appended with the microbiota gut –brain axis perturbation. Herein, we examined whether quercetin, which is anti-inflammatory and antioxidant flavonoid, serves as a prebiotic and modifies the compromised microbiome gut–brain axis in rmTBI mouse model. Male C57BL/6 mice were subjected to rmTBI for 7 times. The quercetin (50 mg/k g) was administered peroral from the day1 of first injury till 7 days post-injury. The neurobehavioral assessments were performed using return of righting reflex (ROR), rotarod, forced swimming test (FST), elevated zero maze (EZM), novel object recognition test (NORT), and Y-maze. Mice fecal sample s, brains, and intestines were collected for molecular studies. Mice underwent rmTBI showed significant neurological deficits in ROR and rotarod test and also exhibited long-term neuropsychiatric aberrations like anxiety- and depression-like phenotypes, and cognitive deficits in EZM, FST, and Y-maze assays, respectively. Repeated peroral administration of quercetin ameliorated these neuropsychiatric problems. Quercetin treatment also restored the increased expression of GFAP and decreased expression of occludin and doublecortin in the frontal cortex and hippocampus of rmTBI mice. The altered l evels of acetate and propionate, and microbial phylum abundance in fecal samples were also nor...
Source: NeuroMolecular Medicine - Category: Neurology Source Type: research