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Peroxiredoxin 4 levels in patients with PCOS and/or obesity.

BACKGROUND: Peroxiredoxin 4 is a part of endogen antioxidant system and its levels are elevated in increased oxidative stress conditions. It is found to be positively associated with cardiovascular risk. The aim of the study was to investigate peroxiredoxin 4 levels in women with polycystic ovarian syndrome (PCOS) and/or obesity.

METHODS: In this cros-sesctional study were included 80 patients. Anthropometric measurements and biochemical tests, including peroxiredoxin 4 measurement, were performed.

RESULTS: There was a tendency towards lower peroxiredoxin 4 levels in non-obese PCOS subjects (5674.8 ± 3822.4 pg/ml), higher in obese PCOS (6588.9 ± 3731.0 pg/ml) and even higher in obese patients without PCOS (7724.6 ± 4840.4 pg/ml). Patients with abdominal obesity according to waist circumference and waist-to-hip ratio had significantly higher levels of peroxiredoxin compared to those without (7108.2 ± 4568.0 vs. 5079.8 ± 2555.4 pg/ml; p = 0.015 and 7310.6 ± 2646.2 vs. 4785.0 ± 2646.2 pg/ml; p = 0.013). There was no difference in peroxiredoxin 4 levels in patients with and without insulin resistance, hypertension, dislipidemia, hyperandrogenemia, metabolic syndrome. Peroxiredoxin 4 showed weak positive correlation to weight (r = 0.228; p = 0.044) and visceral adiposity index (r = 0.278; p = 0.031) and higher to erythrocyte sedimentation rate (r = 0.4; p < 0.01), but not to hormonal parameters and insulin sensitivity indexes.

CONCLUSIONS: Non-obese patients with PCOS have a tendency towards lower peroxiredoxin 4 levels compared to obese patients with and without PCOS. Patients with abdominal obesity have significantly higher peroxiredoxin 4 levels than those without. We were not able to prove correlation between peroxiredoxin 4 levels and hormonal and carbohydrate status of the PCOS patients.

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