Slowing Alzheimer's disease progression through probiotic supplementation.

Area of Science:

• Neuroscience
• Microbiology
• Pharmacology

Background:

• Cognitive impairment and neurodegeneration lack affordable treatments.
• The gut-brain axis highlights the gut microbiota's role in neurological disorders like Alzheimer's disease (AD).
• Probiotic therapy for AD-associated gut dysbiosis remains underexplored.

Purpose of the Study:

• To investigate the effects of probiotic supplementation on gut dysbiosis in an AD mouse model.
• To evaluate the impact of probiotics on neurodegeneration progression and cognitive function in AD mice.

Main Methods:

• Transgenic 3xTg-AD mice were administered a control or probiotic diet (Lactobacillus plantarum KY1032 and Lactobacillus curvatus HY7601) for 12 weeks.
• Gut microbiota composition was analyzed, focusing on Bacteroidetes abundance.
• Cognitive function was assessed using the Barnes Maze test.
• Neural tissue (entorhinal cortex, hippocampus) was analyzed for astrocytic, microglial, and neuronal densities.

Main Results:

• Probiotic supplementation significantly increased Bacteroidetes abundance.
• Probiotic-fed AD mice showed improved memory performance in cognitive tests.
• Reduced astrocytic and microglial densities were observed in the brains of probiotic-fed AD mice, particularly females.
• Increased hippocampal neuron numbers suggested neuroprotection in probiotic-treated AD mice.

Conclusions:

• Probiotic supplementation may effectively delay or mitigate early-stage neurodegeneration in the 3xTg-AD mouse model.
• Probiotics offer a potential inexpensive and easily implementable adjuvant therapy for Alzheimer's disease.
• Further research into probiotic interventions for neurodegenerative diseases is warranted.