Metformin: Repurposing Opportunities for Cognitive and Mood Dysfunction
Abstract
BACKGROUND: Cognitive deficits differentially affect individuals with type 2 diabetes mellitus (T2DM) and mood disorders. Accumulating evidence implicates disturbances in metabolism as salient to cognitive function. Thus, the mitigation of metabolic disturbances may preserve or ameliorate cognitive function. This review aims to evaluate available evidence investigating the effects of metformin on cognitive function as well as summarize putative mechanistic properties related to these clinical effects. METHODS: A PubMed search was conducted using the search words including, but not limited to: metformin, Major Depressive Disorder, type 2 diabetes mellitus, and cognitive dysfunction. All English language articles published from 1990 to July 2014 were reviewed. RESULTS: Extant preclinical and clinical data have been mixed, wherein both cognitive disruption and pro-cognitive effects have been reported with the administration of metformin. Sound mechanistic evidence supports metformin as a treatment; however, the heterogeneity of study designs has contributed to an inability to arrive at an unequivocal conclusion regarding metformin effects upon cognition. CONCLUSION: Available evidence does not provide a robust signal for improvement in cognition in either mood disorder or T2DM samples. Notwithstanding, it is premature to label metformin as a "no-go" agent for further testing and development for cognitive dysfunction. A well designed, proof-of-concept trial of metformin investigating its possible cognitive effects in mood disorders is therefore warranted.
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Metformin holds promise as an agent capable of attenuating and/or reverting neurotoxic effects mediated by inflammatory mechanisms, metabolic and mitochondrial dysfunction, as well as increased oxidative stress.
“Finally, the anti-diabetic drug metformin holds promise as an agent capable of attenuating and/or reverting neurotoxic effects mediated by inflammatory mechanisms, metabolic and mitochondrial dysfunction, as well as increased oxidative stress [121].”
From Cognitive remission: a novel objective for the treatment of major depression? (2016) · cites this paper as [121]
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- Authors
- Ying, M., Maruschak, N., Mansur, R., Carvalho, A., Cha, D., & McIntyre, R.
- Affiliations
- University Health Network (CA)
- Corresponding author
- McIntyre, Roger
- Venue
- CNS & Neurological Disorders - Drug Targets
- Publisher
- Bentham Science Publishers Ltd.
- Published
- 2015-01-22
- Volume
- 13
- Issue
- 10
- Pages
- 1836-1845
- ISSN
- 1568-007X (ISSN-L)
- 1871-5273
- OpenAlex
- W2149587643
- Cited by
- 29
- References
- 86
- Citations by year
- 2025: 2 · 2024: 1 · 2023: 5 · 2022: 6 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 1 · 2017: 1 · 2016: 3
- FWCI
- 0.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- CNS & Neurological Disorders - Drug Targets (publishedVersion)
- PubMed (publishedVersion)
- UNIFESP Institutional Repository (Universidade Federal de São Paulo) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- metformin, drug repurposing, cognitive impairment, mood disorders, major depressive disorder, type 2 diabetes, metabolic disorders, antidepressant effects
- MeSH terms
- Cognition Disorders, Humans, Metformin, Nootropic Agents, Mood Disorders
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