ArticleActa neurologica Belgica2024
Causal effects of genetically predicted testosterone on Alzheimer's disease: a two-sample mendelian randomization study.
Article in Acta neurologica Belgica, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
4 citing papers in PubMed, 1 synthesis or guideline pooled it, 4 citations in OpenAlex.
- The causal association between circulating metabolites and Alzheimer's disease: a systematic review and meta-analysis of Mendelian randomization studies.Metabolomics : Official journal of the Metabolomic Society · 2025Pooled it
- Peripheral and Central miRNA Signatures in Alzheimer's Disease: Tissue-Specific Variability, Sex-Associated Differences, and Implications for Blood-Based Biomarkers.International journal of molecular sciences · 2026Review
- Brain Nuclei in the Regulation of Sexual Behavior, Peripheral Nerves Related to Reproduction, and Their Alterations in Neurodegenerative Diseases: A Brief Review.Brain sciences · 2025Review
- Genetic effects of circulating hormone and proteome on amyotrophic lateral sclerosis identified by Mendelian randomization.Scientific reports · 2025Article
Corrections and comments
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Authors and funding
7 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveAlthough several studies have reported that testosterone may protect against Alzheimer's disease, no evidence of a causal relationship has been demonstrated.
methodsA Mendelian randomization (MR) study was performed to determine the causal role of testosterone in Alzheimer's disease. The study utilized public databases obtained from separately published genome-wide associationstudies (GWAS). Single-nucleotide polymorphisms (SNPs) for testosterone were extracted from the most recent and largest published GWAS meta-analysis (178,782 participants), and SNPs for Alzheimer's disease were extracted from UK Biobank (954 AD cases and 487,331 controls). The odds ratio (OR) of the inverse variance weighting (IVW) approach was the primary outcome, and the weighted median and MR Egger regression were used for sensitivity analysis.
resultsThrough IVW, we observed a causal association between genetically predicted testosterone and the risk of Alzheimer's disease, with an OR of 0.99 (95% confidence interval [CI] = 0.998-0.999, p = 0.047). In the sensitivity analyses, the weighted median regression showed directionally similar estimates (OR = 0.99, 95% CI = 0.998-0.999, p = 0.048). The MR Egger regression showed similar estimates (OR = 0.99, 95% CI = 0.998-1.00, p = 0.35), but with lower precision. Funnel plots, MR Egger intercepts, and Mendelian randomization pleiotropy residual sum and outlier (MR-PRESSO) analysis indicated the absence of directional pleiotropy effects.
conclusionIn conclusion, our MR study provides evidence of a causal relationship between testosterone levels and Alzheimer's disease; however, this relationship must be validated in future studies with larger sample sizes. Early testosterone monitoring may enable the prevention of Alzheimer's and related diseases.
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