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Hypothalamic‐pituitary‐adrenal axis suppression in asthma: A glucocorticoid receptor polymorphism may protect
Author(s) -
Akurugu Wisdom Alemya,
Van Heerden Carel Jacobus,
Mulder Nicola,
Zöllner Ekkehard Werner
Publication year - 2021
Publication title -
pediatric allergy and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.269
H-Index - 89
eISSN - 1399-3038
pISSN - 0905-6157
DOI - 10.1111/pai.13379
Subject(s) - medicine , endocrinology , metyrapone , single nucleotide polymorphism , genotype , glucocorticoid receptor , basal (medicine) , glucocorticoid , adrenocorticotropic hormone , hormone , gene , biology , genetics , insulin
Background Asthmatic children on corticosteroids can develop hypothalamic‐pituitary‐adrenal axis suppression (HPAS). Single nucleotide polymorphisms (SNPs) rs242941 and rs1876828 of the corticotrophin‐releasing hormone receptor 1 (CRHR1) gene were associated with lower stimulated cortisol (F) levels, whereas rs41423247 of the glucocorticoid receptor (NR3C1) gene was associated with higher basal F levels. The objective of the current study was to confirm whether these three SNPs are associated with HPAS in asthmatic children. Methods DNA was extracted from saliva obtained from 95 asthmatic children, who had previously undergone basal F and metyrapone testing. Thirty‐six children were classified as suppressed. Non‐suppressed children were subclassified according to their post‐metyrapone adrenocorticotropin (PMTP ACTH) level into a middle (106‐319 pg/mL) and a high (>319 pg/mL) ACTH response group. TaqMan ® polymerase chain reaction assays were utilized. Results Only rs41423247 was inversely associated with HPAS (OR = 0.27 [95% CI 0.06‐0.90]). Its GC genotype was inversely associated with HPAS (log odds = −1.28, P = .021). √PMTP ACTH was associated with CC (effect size = 10.85, P = .005) and GC genotypes (effect size = 4.06, P = .023). The C allele is inherited as a dominant trait (effect size = −1.31 (95% CI −2.39‐−0.33; P = .012). In the high ACTH response group, both genotypes affected the PMTP ACTH (effect sizes 1.41 and 15.46; P ‐values .023 and <2 × 10 −26 for GC and CC, respectively). Conclusions The C allele of rs41423247 was found to be protective against HPAS. CC genotype is associated with the highest PMTP ACTH response.