Neuroprotective Effects of Mushroom Biomass Digestive Fractions and Gut Microbiota Metabolites in Microglial and Caenorhabditis elegans Models of Neurodegeneration

Summary

This study tested whether common and medicinal mushrooms could protect against Alzheimer’s disease by reducing harmful reactive oxygen species in brain cells. Researchers tested three mushroom types using digestive simulation to see what the body could absorb, plus key compounds made by gut bacteria. The mushroom extracts and certain bacterial metabolites successfully reduced cellular damage markers and improved behavior in disease-model worms, suggesting mushroom-rich diets may help prevent neurodegeneration.

Background

Alzheimer’s disease is characterized by β-amyloid plaques, neurofibrillary tangles, and neuroinflammation. Reactive oxygen species act as triggers for neuroinflammatory responses contributing to neuronal damage. Mushrooms contain bioactive compounds with potential neuroprotective and prebiotic effects.

Objective

To evaluate the neuroprotective effects of simulated digestive fractions and gut microbiota-derived metabolites from three mushroom species (Trametes versicolor, Hericium erinaceus, and Pleurotus ostreatus) on ROS production in human microglial cells and in transgenic C. elegans models expressing hyperphosphorylated Tau or β-amyloid.

Results

Mushroom digestive fractions and short-chain fatty acids significantly decreased ROS levels in HMC3 cells in a dose-dependent manner. Mushroom fractions, butyric acid, and GABA improved behavioral outcomes in C. elegans, enhancing chemotaxis and delaying paralysis. Effects varied among mushroom species and metabolites.

Conclusion

Mushroom-derived digestive fractions and microbiota-related metabolites exhibit neuroprotective activity through modulation of oxidative stress and mitigation of neurodegeneration-associated behaviors. Diets enriched with these mushroom biomasses may support preventive strategies for neurodegenerative diseases, though further research is needed to elucidate molecular mechanisms.
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