Treventis, 60 Leonard Avenue 4KD 472, Toronto, ON (2026)

05/28/2026

Early APOE4 effects may begin with disruptions in hippocampal circuit stability, long before Alzheimer’s symptoms appear.

In young APOE4 knockin mice, researchers recently identified region-specific network hyperexcitability that later predicted cognitive decline. This abnormal activity arose from distinct groups of smaller, overactive neurons and disappeared when APOE4 was selectively removed from neurons, pointing to a direct neuronal role for the risk gene. As the mice aged, the dentate gyrus developed granule cell hyperexcitability, weakened inhibition, and an excitation-inhibition imbalance. Single-nucleus RNA sequencing revealed age- and cell-type-specific gene changes, including Nell2 as a potential driver of early excitability. CRISPR interference targeting Nell2 normalized abnormal neuronal activity, linking this molecule to APOE4-related dysfunction. These findings connect APOE4 to early circuit impairment and suggest new molecular targets for preventing AD progression.

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https://www.nature.com/articles/s43587-026-01096-0

05/25/2026

New evidence strengthens the idea that tau seeds are active drivers of Alzheimer’s disease progression, not merely markers of pathology.

Researchers measured tau seed bioactivity in synaptosomes from the inferior temporal and superior frontal gyri in 128 individuals and found that higher seeding was linked to tau phosphorylation, neurofibrillary tangle burden, and cognitive impairment. Genetic analyses suggested that tau seeds in the inferior temporal gyrus can promote local tangle formation and drive tau seeding and tangles in distant frontal regions. By integrating antemortem functional MRI, the study further showed that each person’s brain connectivity patterns shape how tau seeds relate to tangle spread. These findings link molecular tau bioactivity with network-level vulnerability, suggesting that individualized connectivity may influence where and how AD pathology propagates through the cortex.

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https://www.cell.com/neuron/fulltext/S0896-6273(26)00164-9?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0896627326001649%3Fshowall%3Dtrue

05/21/2026

A brief cellular encounter with toxic tau oligomers may trigger a long-lasting cascade of synaptic damage tied to Alzheimer’s disease.

In human iPSC-derived neurons, researchers tracked postsynaptic protein changes minutes after exposure and found an early loss of actin motor proteins needed for AMPA receptor movement and synaptic plasticity. Within 24 hours, disease-associated proteins such as GSK3β increased at postsynaptic sites. Over the following days, postsynaptic structures declined first, followed later by presynaptic terminal loss. This stepwise pattern suggests that early postsynaptic disruption may be a trigger for broader synaptic failure over time. Even surviving synapses remained impaired, showing weaker AMPA receptor signaling, fewer vesicle clusters, and lower neurotransmitter release.

The study outlines two harmful outcomes: some synapses progressively weaken, while others disappear entirely, offering a clearer timeline of how tau drives bipartite synapse failure in dementia.

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https://link.springer.com/article/10.1186/s13024-026-00928-2

05/18/2026

New research indicates that the immune environment in the gut might be an early factor in Parkinson’s disease (PD) development.

In PD models, muscularis macrophages, which are essential for maintaining enteric nervous system health, were found to contain misfolded α-synuclein (AS), exhibit endolysosomal dysfunction, and influence T cell responses that seem to travel from the gut to the brain as PD progresses. When these macrophages were specifically removed, the spread of AS in both the enteric nervous system (ENS) and the CNS decreased, T cell expansion was halted, and neurodegeneration and motor symptoms were reduced. These findings suggest that immune activity within the gut could influence the timing of disease onset long before typical movement issues appear.

The results position muscularis macrophages as active participants, rather than mere bystanders, in the progression from gut to brain disease, and emphasize their potential as early biomarkers and targets for PD therapies.

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https://www.nature.com/articles/s41586-025-09984-y

05/14/2026

Advanced chronic traumatic encephalopathy (CTE) pathology appears closely related to cognitive decline, with the strongest effects seen in later disease stages.

In a study of 614 brain donors, researchers found that stage III and IV CTE were independently associated with greater odds of dementia and more severe informant-reported cognitive symptoms. Individuals with stage IV pathology were approximately 4.5 times more likely to have dementia than those without CTE, while stage III also showed a significant association. In contrast, low-stage CTE did not link to dementia or noticeable cognitive impairment. This study also found no clear relationship between CTE severity and mood or behavioral symptoms, suggesting those features may reflect multiple causes rather than just CTE alone.

These findings sharpen the distinction between early and advanced CTE and reinforce that higher-stage pathology is most relevant to measurable cognitive decline.

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https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.71032

05/11/2026

A genome-wide CRISPRi screen in human iPSC-derived neurons has identified key regulators of tau buildup, offering new insights into why some neurons are more vulnerable in tauopathies like Alzheimer’s disease and FTD.

The study uncovered both expected and unexpected pathways, including UFMylation and GPI anchor biosynthesis, which are important in controlling tau oligomer levels. Researchers also found that the E3 ubiquitin ligase complex CRL5SOCS4 helps regulate tau turnover by marking tau for degradation, with higher levels linked to resistance in human tauopathy cases. This explains how failures in protein quality control can lead to selective neuronal vulnerability. Additionally, mitochondrial dysfunction has been shown to promote abnormal tau processing through reactive oxygen species, resulting in disease-associated tau fragments that encourage aggregation.

These findings expand our understanding of tau proteostasis, highlighting promising targets for slowing neurodegeneration.

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https://www.cell.com/cell/fulltext/S0092-8674(25)01487-4?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867425014874%3Fshowall%3Dtrue

05/07/2026

Growing evidence suggests that Chlamydia pneumoniae may worsen Alzheimer’s disease (AD) not only in the brain but also in the retina.

Researchers found a higher bacterial load in AD retinal and brain tissue, with levels increasing alongside APOEε4 status, disease progression, and cognitive decline. Proteomic and experimental data linked the infection to NLRP3 inflammasome activity, amyloid-β42 buildup, inflammation, cell death, pyroptosis, and neuronal damage. This supports the idea that infection-driven immune dysfunction may accelerate neurodegenerative damage. In cultured neurons and AD mouse models, chronic infection worsened pathology and cognitive function, while fewer pathogen-associated microglia in AD retinas indicated impaired immune clearance. Machine learning also showed that retinal C. pneumoniae or NLRP3, especially when combined with amyloid-β42, could help predict AD diagnosis and stage, supporting early antibiotic or inflammasome-targeted treatments.

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https://www.nature.com/articles/s41467-026-68580-4

05/04/2026

Findings from a mouse study suggest that domains may actively worsen neurodegenerative diseases rather than simply accumulate alongside them.

Using AAV9 delivery, researchers expressed a 42-repeat polyserine protein in both normal mice and mice carrying mutant human tau, revealing toxic effects across genotypes. The animals developed weight loss, behavioral abnormalities, motor deficits, and a striking loss of cerebellar Purkinje cells. These results indicate that polyserine itself can disrupt neuronal health even before considering its interaction with other disease proteins. In mice already vulnerable to tau pathology, polyserine further increased levels of phosphorylated and insoluble tau, as well as the seeding activity of brain extracts.

These findings strengthen the idea that polyserine-containing proteins may contribute to both tauopathies and CAG repeat expansion disorders, making them an important target for future disease research and therapeutic exploration.

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https://www.pnas.org/doi/10.1073/pnas.2527425122

04/30/2026

New research indicates that gut bacteria might contribute to inflammation in ALS and FTD linked to C9ORF72 mutations.

Scientists identified 10 distinct bacterial strains that induced macrophage cytokine release in a C9orf72-dependent manner, suggesting that the microbiome is an active factor in disease risk. A key discovery was the bacterial glycogen biosynthesis, which distinguished commensals capable of triggering inflammatory responses. This provided the researchers with a clearer explanation of how gut dysbiosis might influence neurodegeneration. In germ-free C9orf72-deficient mice, colonization with glycogen-producing Parabacteroides merdae increased immune activation, BBB breakdown, and T cell infiltration into the CNS. Breaking down glycogen in the gut improved survival and decreased brain inflammation, while human stool samples showed inflammatory glycogen enrichment in many ALS and C9ORF72-FTD cases, highlighting bacterial glycogen as a modifiable gut-brain target.

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https://www.cell.com/cell-reports/fulltext/S2211-1247(25)01678-X?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS221112472501678X%3Fshowall%3Dtrue

04/27/2026

Targeted modifications in how mutant huntingtin is marked for removal may significantly affect Huntington disease (HD) progression.

Using knock-in mouse models, researchers discovered that preventing ubiquitination at lysines 6 and 9 reduced the efficient clearance of mutant huntingtin, resulting in increased buildup of both soluble and aggregated forms of the protein. The altered protein increasingly accumulated in neuronal nuclei, formed larger inclusion bodies, and accelerated motor decline, brain atrophy, and worsening neuropathology. This indicates that even highly specific disruptions in the cell’s protein quality-control system can greatly impact disease severity. These findings demonstrate that ubiquitination at K6 and K9 is not just a minor molecular detail but a critical regulator of where mutant huntingtin gathers and how toxic it becomes, emphasizing site-specific ubiquitination as a promising therapeutic target for reducing neuronal damage and HD disease progression.

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https://www.pnas.org/doi/10.1073/pnas.2527258122

04/23/2026

Beginning cognitive stimulation before amyloid buildup may help strengthen brain resilience in Alzheimer’s disease (AD) patients.

In TgF344-AD rat models, long-term training preserved memory and maintained connectivity between the entorhinal cortex and dentate gyrus, with the clearest benefits observed in male transgenic animals. Researchers also found restored synaptic plasticity markers, sex-specific molecular responses, as well as reduced inhibitory signaling in trained male rat models. At earlier stages, stimulation briefly improved microglial behavior around amyloid plaques, suggesting a temporary boost in the brain’s ability to respond to the pathology. These findings indicate that timing is important, with earlier intervention offering a better chance to protect vulnerable neural networks. These results support the idea that cognitive reserve can delay functional decline. The study also shows that males and females may benefit through different biological mechanisms.

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https://www.cell.com/iscience/fulltext/S2589-0042(25)02642-2?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2589004225026422%3Fshowall%3Dtrue

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