Abstract
Effects of statins over clinical changes in Alzheimer’s disease (AD) are usually non-significant, but epistatic interactions between genetic variants involved in cholesterol metabolism could be important for such effects. We aimed to investigate whether LDLR single-nucleotide polymorphisms rs11669576 (LDLR8), rs5930 (LDLR10), and rs5925 (LDLR13) are associated with cognitive and functional changes in AD, while also considering APOE haplotypes and lipid-lowering treatment with lipophilic statins for stratification. Consecutive outpatients with late-onset AD were screened with cognitive tests, while caregivers scored functionality and caregiver burden, with prospective neurotranslational correlations documented for 1 year. For 179 patients, minor allele frequencies were 0.078 for rs11669576–A (14.5% heterozygotes), 0.346 for rs5930–A (42.5% heterozygotes), and 0.444 for rs5925–C (56.4% heterozygotes), all in Hardy-Weinberg equilibrium; 134 patients had hypercholesterolemia, and 133 used lipophilic statins. Carriers of rs11669576–G had faster cognitive decline, while functional decline was slower for carriers of rs11669576–A who used lipophilic statins. APOE-ε4 carriers who also carried rs5930–AA had improved caregiver burden, while carriers of haplotypes that included rs5930–AG had worse cognitive and functional outcomes, though carriers of the A allele of rs5930 had better cognitive and functional response to lipophilic statins. APOE-ε4 non-carriers who carried rs5925–TT had slower cognitive decline, while lipophilic statins protected carriers of the other genotypes. We preliminarily conclude that reportedly protective variants of LDLR and APOE against risk of AD also slowed cognitive decline, regardless of cholesterol variations, while therapy with lipophilic statins might benefit carriers of specific genetic variants.
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Funding
This work was sponsored by CAPES–Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (grant #1067/10) and FAPESP–The State of São Paulo Research Foundation (grant #2015/10109-5 and grant #2015/18125-0).
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All procedures were in accordance with the ethical standards of the Ethics Committee of Hospital São Paulo, Federal University of São Paulo–UNIFESP, according to the research project 1067/10 (CAAE 0540.0.174.000-10), and followed The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans. All invited patients and their legal representatives agreed to participate on the research and signed the Informed Consent Form before the evaluation.
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Preliminary aspects of this study were previously presented (and published in the form of abstracts) at the following meetings:
1. AAIC>14 – Alzheimer’s Association International Conference 2014
(with an Alzheimer’s Association Travel Fellowship to the first author)
(Alzheimer’s Association, Copenhagen/DENMARK, July 2014):
https://doi.org/10.1016/j.jalz.2014.05.698
2. 29th CINP World Congress of Neuropsychopharmacology
(Collegium Internationale Neuro-Psychopharmacologicum, Vancouver/CANADA, June 2014)
https://doi.org/10.1017/S1461145714000741
3. 66th Annual Meeting of the American Academy of Neurology
(American Academy of Neurology, Philadelphia/USA, April 2014):
4. AD/PD 2013 – The 11th International Conference on Alzheimer’s & Parkinson’s Diseases
(Kenes International, Florence/ITALY, March 2013)
Alzheimer’s and Parkinson’s Diseases: Mechanisms, Clinical Strategies, and Promising Treatments of Neurodegenerative Diseases. Basel: Karger, 2013, v.11, p. 700.
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de Oliveira, F.F., Chen, E.S., Smith, M.C. et al. Selected LDLR and APOE Polymorphisms Affect Cognitive and Functional Response to Lipophilic Statins in Alzheimer’s Disease. J Mol Neurosci 70, 1574–1588 (2020). https://doi.org/10.1007/s12031-020-01588-7
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DOI: https://doi.org/10.1007/s12031-020-01588-7