Thyroid function and thyroid antibodies in patients with alopecia areata: a comparison of clinical patterns

Celorio-Murillo, Winnie Joanne; Cifuentes, Luisa; Cantor, Érika; Wagner, Adriana

doi:10.1016/j.abd.2022.10.007

Cited by 1 publication

(1 citation statement)

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“…Previous studies have indicated that hypothyroidism was associated with a higher risk of alopecia areata ( 11 , 12 ). Specifically, in a cohort of 89 individuals with alopecia areata (median age: 40 years; male–female ratio: 0.17), a concurrent diagnosis of hypothyroidism was reported ( 13 ). Similarly, another study involved 78 newly diagnosed alopecia areata patients (male–female ratio: 1.44; mean age: 32.7 ± 3.09 years) attending a community dermatology clinic between 2007 and 2011.…”

Section: Discussionmentioning

confidence: 99%

Mendelian randomization study highlights hypothyroidism as a causal determinant of alopecia areata

Zheng,

Ma,

Zhang

et al. 2024

Front. Endocrinol.

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BackgroundAlthough observational studies have found an association between hypothyroidism and alopecia areata, the causality of this relationship remains unclear.ObjectivesThis study aimed to investigate the genetic variants associated with hypothyroidism and their potential impact on the risk of developing alopecia areata.Methodsgenome-wide association study summary statistics for hypothyroidism (30,155 cases and 379,986 controls) and alopecia areata (289 cases and 211,139 controls) were obtained from the IEU OpenGwas project. The inverse variance-weighted method was used as the primary analysis method to evaluate the causality between hypothyroidism and alopecia areata, supplemented by the weighted median, MR-Egger, simple mode and weighted mode. Furthermore, the function of causal SNPs was evaluated by gene ontology (GO) analysis, Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis, and protein–protein interaction networks.ResultUtilizing two-sample Mendelian randomization analysis, we found that the single-nucleotide polymorphisms (SNPs) of hypothyroidism (OR = 1.40, 95% CI: 1.12–1.75, p = 3.03×10−3) significantly increased the risk of alopecia areata ( 289 cases and 211,139 controls ). KEGG pathway analysis showed that the candidate genes were mainly enriched in virion-herpesvirus, Th1 and Th2 cell differentiation, Th17 cell differentiation, T-cell receptor signaling pathway, PD-L1/PD-1 checkpoint pathway in cancer and Toll-like receptor signaling pathway. Protein–protein interaction networks results showed that CTLA4, STAT4, IL2RA, TYK2, IRF7, SH2B3, BACH2, TLR3, NOD2, and FLT3.ConclusionThis study provided compelling genetic evidence supporting a causative association between hypothyroidism and alopecia areata, which could potentially inform the development of more efficacious treatment strategies for patients afflicted by alopecia areata.

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Section: Discussionmentioning

confidence: 99%