Vitamin D Deficiency and Interleukin-17 Relationship in Severe Obstructive Sleep Apnea-hypopnea Syndrome
Overview
Affiliations
Purpose: We aimed to assess Vitamin D (VD) abnormalities in patients with severe obstructive sleep apnea-hypopnea syndrome (OSAHS), to study its association with clinical and polygraphic data, and to correlate VD levels with interleukin-17 (IL-17).
Methods: Ninety-two patients with severe OSAHS were consecutively enrolled between September 2014 and February 2016 and compared to age-, sex-, and body mass index (BMI)-matched controls. Anthropometric parameters and medical history were collected. The serum levels of VD and IL-17 were determined by radioimmunoassay and enzyme-linked immunosorbent assay, respectively.
Results: Ninety-two severe OSAHS patients and thirty controls were enrolled in the study. All OSAHS patients had VD deficiency. The mean level of VD was at 7.9 ng/ml among OSAHS group versus 16.8 ng/ml among control group. IL-17A levels were elevated (20.3 pg/ml) in OSAHS group compared to healthy group (10.05 pg/ml). VD levels were negatively correlated with nocturia severity ( = -0.26; = 0.01) and positively correlated with mean O saturation ( = 0.59; = 0.02) and lowest O saturation ( = 0.3; = 0.03). IL-17 levels were positively correlated with nocturia severity ( = 0.24; = 0.03) and negatively correlated with mean O saturation ( = -0.42; = 0.03). A significant negative association was observed between IL-7 and VD levels ( = -0.64, = 0.2 10). The magnitude of this correlation was higher for important nocturia, lower MSaO, or higher BMI.
Conclusions: VD deficiency in patients with severe OSAHS is common with a negative association between IL-17 and VD serum levels. Hypoxia could play an important role in this association. Further studies are needed to clarify this relationship.
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