Molecular mechanisms underpinning cognitive reserve and resilience.
- 1Division of Neuroscience, Department of Brain Sciences, Imperial College London, London, United Kingdom.
- 2Department of Psychiatry and Psychotherapy, LMU Hospital, Ludwig-Maximilians University Munich, Munich, Germany.
- 3German Centre for Neurodegenerative Diseases (DZNE) Munich, Munich, Germany.
Abstract
The concept of cognitive reserve (CR) and resilience originates from clinicopathological observations that amyloid-β deposition, tau pathology and neurodegeneration do not uniformly translate into clinical dementia, highlighting inter-individual differences in the brain's capacity to tolerate pathology. Although CR and resilience lack a single accepted definition, they broadly describe the ability to maintain cognition in the presence of age-related or pathological brain changes. This review synthesises current molecular, cellular, and brain network mechanisms of cognitive reserve and critically examines key controversies. We also identify convergent biological pathways across multiple levels of organisation. Available evidence implicates that CR is not attributable to a single factor but reflects interactions among environmental exposures, genetic background, epigenetic regulation, cellular homeostasis, glial function, and large-scale brain network organisation. Lifestyle factors are associated with reduced pathology accumulation, preserved brain structure, and maintenance of cognition despite pathology, depending on the mechanism and outcome considered and are understood to exert their effects through epigenetic modulation of neuroplasticity, neurotrophic signalling, metabolic regulation, and inflammatory pathways. At the cellular level, preservation of dendritic spine integrity, synaptic signalling balance, mitochondrial energetic flexibility, and adult hippocampal neurogenesis supports efficient circuit function under pathological stress. Glial cells play central roles in mediating adaptive plasticity, neuroinflammatory control, and metabolic support, with dysregulation accelerating cognitive decline. Collectively, these findings frame CR as an emergent property of coordinated biological processes operating across molecular, cellular, and network scales, with important implications for developing reserve-enhancing therapeutic and lifestyle-based interventions that complement traditional pathology-focused approaches.
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BibTeX
@article{chen2026molecular,
title = {{Molecular mechanisms underpinning cognitive reserve and resilience.}},
author = {Amber Chen and Sreenithi Bhuvaneshwaran and Yash Akkara and Thomas Burke and Robert Perneczky and Magdalena Sastre},
journal = {Frontiers in aging neuroscience},
year = {2026},
month = oct,
doi = {10.3389/fnagi.2026.1957901},
url = {https://europepmc.org/article/MED/42921247},
note = {CC BY},
}
RIS
TY - JOUR
TI - Molecular mechanisms underpinning cognitive reserve and resilience.
AU - Amber Chen
AU - Sreenithi Bhuvaneshwaran
AU - Yash Akkara
AU - Thomas Burke
AU - Robert Perneczky
AU - Magdalena Sastre
PY - 2026
DA - 2026/10/09
JO - Frontiers in aging neuroscience
DO - 10.3389/fnagi.2026.1957901
UR - https://europepmc.org/article/MED/42921247
AB - The concept of cognitive reserve (CR) and resilience originates from clinicopathological observations that amyloid-β deposition, tau pathology and neurodegeneration do not uniformly translate into clinical dementia, highlighting inter-individual differences in the brain's capacity to tolerate pathology. Although CR and resilience lack a single accepted definition, they broadly describe the ability to maintain cognition in the presence of age-related or pathological brain changes. This review synthesises current molecular, cellular, and brain network mechanisms of cognitive reserve and critically examines key controversies. We also identify convergent biological pathways across multiple levels of organisation. Available evidence implicates that CR is not attributable to a single factor but reflects interactions among environmental exposures, genetic background, epigenetic regulation, cellular homeostasis, glial function, and large-scale brain network organisation. Lifestyle factors are associated with reduced pathology accumulation, preserved brain structure, and maintenance of cognition despite pathology, depending on the mechanism and outcome considered and are understood to exert their effects through epigenetic modulation of neuroplasticity, neurotrophic signalling, metabolic regulation, and inflammatory pathways. At the cellular level, preservation of dendritic spine integrity, synaptic signalling balance, mitochondrial energetic flexibility, and adult hippocampal neurogenesis supports efficient circuit function under pathological stress. Glial cells play central roles in mediating adaptive plasticity, neuroinflammatory control, and metabolic support, with dysregulation accelerating cognitive decline. Collectively, these findings frame CR as an emergent property of coordinated biological processes operating across molecular, cellular, and network scales, with important implications for developing reserve-enhancing therapeutic and lifestyle-based interventions that complement traditional pathology-focused approaches.
SN - 1663-4365
ER -