Abstract
Alopecia areata (AA) is an autoimmune disease associated with high levels of proinflammatory cytokines. Since chronic inflammation plays a major role in the pathogenesis of insulin resistance, AA can theoretically increase the risk of diabetes. We sought to investigate this theory by conducting a case–control study. Sixty patients with alopecia areata and 60 healthy volunteers (matched for age, sex, and body mass index) were evaluated. Fasting blood glucose (FBS), C-peptide, plasma insulin, and homeostasis model assessment for insulin resistance (HOMA-IR) were measured for each individual. Plasma levels of insulin [median (interquartile range IQR): 11.22 (7.28–18.15) µIU/ml vs. 4.80 (3.20–9.00), p < 0.0001)], C-peptide [median (IQR): 2.10 (1.61–3.00) ng/ml vs. 1.40 (1.20–1.88), p < 0.0001)] and HOMA-IR [median (IQR): 2.70 (1.58–3.96) µIU/ml vs. 1.01 (0.64–1.98, p < 0.0001)] were significantly higher in patients with AA compared to controls. The differences remained significant even after controlling for age, gender, and BMI. Patients with a more severe disease (alopecia totalis/universalis) had higher levels of insulin [median (IQR): 15.80 (9.68–21.55) vs. 9.30 (5.33–14.40), p = 0.02)] and HOMA-IR [median (IQR): 3.30 (2.20–4.84) vs. 2.15 (1.29–3.52), p = 0.01] compared to those with patchy hair loss. Our data suggest that individuals with AA are at a higher risk of developing insulin resistance. This may be due to common inflammatory pathogenesis or a shared genetic background.
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Abbreviations
- AA:
-
Alopecia areata
- AT:
-
Alopecia totalis
- AU:
-
Alopecia universalis
- HOMA-IR:
-
Homeostasis model assessment for insulin resistance
- IQR:
-
Interquartile range
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Shahidi-Dadras, M., Bahraini, N., Rajabi, F. et al. Patients with alopecia areata show signs of insulin resistance. Arch Dermatol Res 311, 529–533 (2019). https://doi.org/10.1007/s00403-019-01929-6
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DOI: https://doi.org/10.1007/s00403-019-01929-6