InflammopharmacologyMar 10, 2026

Balancing the Gut-Brain Link to Support Brain Immunity and Protect Thinking in Alzheimer's Disease

Gut-Brain Axis Weekly Brief ↗PubMed ↗DOI ↗

Updated Mar 16, 2026

Abstract

Alzheimer's disease is marked by progressive cognitive impairment and is associated with gut dysbiosis impacting neuroinflammation and amyloid-β accumulation.

Gut dysbiosis may exacerbate neuroinflammatory signaling and disrupt the structural stability of the intestinal and blood-brain barriers.
Preclinical studies suggest that symbiotic interventions can restore microbial balance and improve communication between the gut and brain.
Symbiotics may suppress pro-inflammatory cytokines and upregulate neurotrophic factors, potentially enhancing cognitive resilience.
These interventions are associated with reduced neuroinflammation, improved mitochondrial function, and enhanced synaptic activity.
The review evaluates the potential of symbiotic treatments in modulating the gut-brain axis to mitigate Alzheimer's symptoms and delay progression.

Simplified

Alzheimer's disease (AD) is a multifactorial neurodegenerative disorder defined by progressive cognitive impairment, neuroinflammation, oxidative stress, amyloid-β (Aβ) accumulation, synaptic dysfunction, mitochondrial impairment, and tau hyperphosphorylation. The gut-brain axis (GBA) is a crucial regulatory signaling cascade that links intestinal microbiome composition with both neural health and disease through the vagus nerve. Gut dysbiosis has increasingly been implicated in AD pathogenesis by exacerbating systemic and neuroinflammatory signaling, disrupting intestinal and blood-brain barrier (BBB) structural stability, and promoting microglial activation, thereby facilitating Aβ aggregation and neurodegeneration. Preclinical studies indicate that symbiotic interventions restore microbial balance and improve gut-brain communication, contributing to neuroprotective effects. Additionally, it has been demonstrated that symbiotics can restore synaptic plasticity and cognitive resilience by suppressing pro-inflammatory cytokines, as exemplified by interleukin-1β (IL-1β) and tumour necrosis factor-α (TNF-α), and by upregulating neurotrophic factors, particularly brain-derived neurotrophic factor (BDNF). These effects are associated with normalised glial reactivity, attenuation of oxidative stress, and improved mitochondrial bioenergetics, together contributing to enhanced synaptic function, reduced neuroinflammation, and preservation of cognitive performance. This review highlights a critical assessment of the treatment potential of symbiotic interventions in modulating the GBA in AD, emphasising mechanistic insights into neurodegenerative pathways and evaluating their capacity to mitigate symptoms and delay disease progression, as supported by current preclinical evidence.

Full Text

Full text is available at the source.

View Full Text ↗

Funding

Competing interests

Declarations. Conflict of interest: The authors declare no competing interests. Ethical approval: Not applicable. Consent to participate: Not applicable. Consent for publication: Not applicable.

PubMed

Balancing the Gut-Brain Link to Support Brain Immunity and Protect Thinking in Alzheimer's Disease

Abstract

Full Text

Funding

Competing interests

You found one interesting study. We’ll send the next 7.

What Lands in Your Inbox Each Week:

Recent issues from the gut-brain axis brief

Abstract

Full Text

Funding

Competing interests

Related papers

You found one interesting study. We’ll send the next 7.

What Lands in Your Inbox Each Week:

Recent issues from the gut-brain axis brief