ABSTRACT
There are studies revealing the effects of estrogen receptors alpha (α) and beta (ß) on hair follicles. However, the effects of G protein-coupled estrogen receptors (GPER-1) on hair follicles have not been elucidated. This study aims to evaluate the relationship between serum GPER-1 levels and the severity and duration of the disease in patients with androgenetic alopecia (AGA). The study included 81 patients with AGA aged 18 to 50 years (22 men and 19 women with an onset of AGA more than 5 years, and 20 men and 20 women with an onset of AGA less than 5 years) and 40 healthy controls (20 men, 20 women). The mean age of participants with AGA was 29.12 ± 8.15 (18-50), and the mean age of the control group was 25.21± 4.71 (19-42). Serum GPER-1 levels were measured, and the relationship between GPER-1 levels and duration of the disease, severity of the disease, and sex was statistically evaluated. The serum level of GPER-1 was significantly higher in patients with AGA as compared to the control group (p < 0.001). A negative correlation was found between serum GPER-1 levels and the duration of the disease in both men and women (p < 0.001, r = 0.793; p < 0.001, r = 0.711, respectively). There was a significant relationship between serum GPER-1 levels and the severity of the disease in both men and women (p = 0.003; p = 0.002, respectively). Additionally, a significant difference in GPER-1 levels was noted between male and female patients with AGA (p = 0.001). However, no statistically significant relationship was identified between GPER-1 levels and estrogen levels (p = 0.097). The higher levels of GPER-1 in patients with AGA compared to the control group, and the significant relationship between GPER-1 levels and both the duration and severity of the disease, suggest an estrogen-independent role of GPER-1 in the pathogenesis of AGA. The fact that GPER-1 levels are high in the early stages of AGA when inflammation is prominent suggests that treatments targeting these receptors may be effective at this stage.