Dates: July 12-15, 2026
Location: London, United Kingdom
Organizer: Alzheimer's Association
Website: aaic.alz.org
AAIC 2026 featured groundbreaking research on neurogenesis, brain plasticity, and neural network reorganization in Alzheimer's disease. These mechanisms represent promising therapeutic targets for cognitive enhancement and disease modification[@aaic2026].
Adult hippocampal neurogenesis continues throughout life in the dentate gyrus subgranular zone. Research presented at AAIC 2026 highlighted:
- Age-related decline: Neurogenesis decreases with age, but remains detectable in older adults[@kempermann2024][@gage2024]
- AD-related impairment: Multiple studies demonstrated reduced neurogenesis in Alzheimer's disease models and human patients[@disouky2026]
- Therapeutic potential: Enhancing neurogenesis may help restore hippocampal function and memory
| Finding |
Model/Species |
Implication |
| Reduced neural progenitor cell proliferation |
APP/NL-G-F mice |
Early intervention target |
| Impaired dendritic integration |
Human AD tissue |
Circuit-level dysfunction |
| Microglial modulation effects |
Mouse models |
Inflammatory regulation |
Physical exercise emerged as a key driver of neurogenesis:
- Aerobic exercise increases BDNF expression and promotes hippocampal neurogenesis
- Environmental enrichment enhances neural progenitor cell survival
- Combination approaches show synergistic benefits
¶ Long-Term Potentiation (LTP) and Depression (LTD)
Synaptic plasticity—the brain's ability to strengthen or weaken synaptic connections—was a major focus[@selkoe2024]:
LTP Impairment in AD:
- Amyloid-beta oligomers disrupt NMDA receptor signaling
- Tau pathology affects dendritic spine morphology
- Calcium dysregulation impairs plasticity-related signaling
Therapeutic Approaches:
- PDE inhibitors to enhance plasticity-related signaling pathways
- M1-selective muscarinic agonists for synaptic plasticity enhancement
- Synaptic protection strategies targeting amyloid-tau interactions[@hernandez2023]
AAIC 2026 highlighted spine pathology in AD:
- Spin loss: Early loss of dendritic spines precedes cognitive symptoms
- Morphological changes: Spine shape alterations affect synaptic function
- Activity-dependent maintenance: Ongoing neural activity is required for spine stability
The brain's capacity to reorganize neural networks was discussed:
- Cognitive training promotes neural efficiency
- Network plasticity allows compensation for pathological burden
- Sensorimotor integration in rehabilitation approaches
Research presented by Stern and colleagues updated cognitive reserve models[@stern2026][@mandelkow2026]:
- Cognitive reserve enables maintenance of function despite pathology
- High reserve individuals show cognitive resilience despite equivalent tau burden
- Lifestyle factors build reserve across the lifespan[@williams2026]
Reserve-Building Interventions:
| Intervention |
Mechanism |
Evidence Level |
| Aerobic exercise |
BDNF, neurogenesis |
Strong |
| Cognitive training |
Neural efficiency |
Moderate |
| Social engagement |
Network plasticity |
Moderate |
| Mediterranean diet |
Anti-inflammatory |
Moderate |
- Pharmacological: Small molecules targeting neural progenitor cells
- Cell-based: Stem cell transplantation strategies
- Lifestyle: Exercise, environmental enrichment
- Combination: Multi-modal approaches
- PDE inhibitors: Enhance cAMP/PKA/CREB signaling
- BDNF mimetics: Promote synaptic plasticity
- Muscarinic agonists: M1-selective activation
- NMDA modulators: Optimize glutamate signaling
- "Hippocampal neurogenesis in Alzheimer's disease models" — Novel imaging approaches
- "Exercise-induced plasticity mechanisms" — Molecular pathways
- "Cognitive reserve accumulation across the lifespan" — Longitudinal evidence
- "Synaptic plasticity and tau pathology" — Interactive mechanisms
- Dupre et al., Neurogenesis and adult brain plasticity in Alzheimer's disease. Nat Rev Neurosci. 2024[@dupre2024]
- Selkoe DJ. Synaptic plasticity and the hallmarks of Alzheimer's disease. Nat Rev Neurosci. 2024[@selkoe2024]
- Hernandez FX et al. Synaptic plasticity deficits in Alzheimer's disease models. Nat Rev Neurosci. 2023[@hernandez2023]
- Stern Y et al. Cognitive reserve models update. Nature Aging. 2026[@stern2026]
- Williams OA et al. Lifestyle-based cognitive reserve accumulation. Nature Aging. 2026[@williams2026]
- Disouky A et al. Human hippocampal neurogenesis in AD. Nature. 2026[@disouky2026]