Probiotic-fermented ginger-processed Gastrodia elata BI. Ameliorates AlCl3-induced cognitive dysfunction in an Alzheimer's disease rat model by regulating the gut microbiota and CREB/BDNF pathway

Abstract

Gastrodia elata BI., which is an edible plant, has been reported in previous studies to possess a strong capacity for alleviating the symptoms of Alzheimer's disease (AD). This study focuses on ginger-processed and fermented Gastrodia elata BI. (FGGE) to investigate its effects on behaviour, brain neuroregulation, and the gut microbiota in an AlCl3-induced AD rat model, and to explore the underlying mechanisms. Results indicate that FGGE significantly improved novel object recognition and the correct alternation rate in the Y-maze test for AD rats. In addition, FGGE alleviated brain oxidative stress and restored the anti-inflammatory response, cholinergic function, and tissue morphology in the hippocampus. Furthermore, FGGE activated the cAMP response element–binding protein/brain-derived neurotrophic factor signalling pathway, reversing neural network abnormalities and enhancing neural regulation. FGGE also promoted the proliferation of bacteria negatively associated with AD, such as Methanosphaera and Lactobacillus, thereby restoring gut microbiota balance. The mechanisms by which FGGE alleviates AD may involve the modulation of the gut-brain axis, ultimately mitigating AD symptoms. FGGE represents an innovative functional food with significant therapeutic potential and promising application prospects.