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AMPK→autophagy→mutant huntingtin clearance
Metformin's pleiotropic actions — including AMPK activation, autophagy modulation, and mitochondrial protection — are mechanistically relevant to Huntington's disease pathology involving mutant huntingtin aggregation and striatal neurodegeneration. Evidence includes dedicated reviews and mechanistic papers though primarily preclinical, with 3 papers up to 2022.
“Areas covered: The authors review literature on metformin treatment in Parkinson’s disease, Huntington’s disease and other neurological diseases of the CNS along with neuroprotective effects of AMPK activation and suppression of the mammalian target of rapamycin (mTOR) pathway on peripheral neuropat”
— Metformin as a potential therapeutic for neurological disease: mobilizing AMPK to repair the nervous system (2020)DOI“Metformin to treat Huntington disease: A pleiotropic drug against a multi-system disorder.”
— Metformin to treat Huntington disease: A pleiotropic drug against a multi-system disorder. (2022)DOI“Recently, metformin was reported to be beneficial in various neurodegenerative diseases, such as Alzheimer's and Huntington's diseases.”
— The Effects of Combined Therapy With Metformin and Hydroxypropyl-β-Cyclodextrin in a Mouse Model of Niemann-Pick Disease Type C1. (2021)DOI“Also, long-term prognosis of HD under metformin/metformin-based treatment was assessed.”
— Impact of overt and subclinical hepatogenous diabetes and metformin treatment on circulatory function, renal function and hemodynamics, inflammatory activity, and prognosis in patients with cirrhosis and ascites. (2025)DOI“Originally used as a first-line treatment for type 2 diabetes, recent studies have begun investigating metformin's effects beyond metabolic disorders, particularly its neuroprotective capabilities against conditions like Parkinson's disease, Alzheimer's disease, Huntington's disease, and multiple sc”
— Overview of Metformin and Neurodegeneration: A Comprehensive Review. (2025)DOI“Preclinical studies have also shown some evidence of metformin's neuroprotective role in Parkinson's disease, Alzheimer's disease, multiple sclerosis and Huntington's disease.”
— Metformin: A Review of Potential Mechanism and Therapeutic Utility Beyond Diabetes. (2023)DOI“In this review, we examine the effects of five compounds that have been shown to extend longevity (metformin, rapamycin, resveratrol, N-acetyl-l-cysteine, curcumin) in four of the most common neurodegenerative diseases (Alzheimer's disease, Parkinson's disease, Huntington's disease, amyotrophic late”
— Compounds that extend longevity are protective in neurodegenerative diseases and provide a novel treatment strategy for these devastating disorders. (2020)DOI