Background/aim: To measure the expression of 1α-hydroxylase (CYP27B1) and serum 25(OH)D concentration in systemic lupus erythematosus (SLE) and to investigate the role of CYP27B1 in SLE. Materials and methods: Seventy-seven SLE patients and 35 healthy controls (HCs) were enrolled from September 2017 to January 2020. T he study design is cross-sectional. mRNA expression of CYP27B1 in peripheral blood mononuclear cells (PBMCs) was measured by reverse-transcription quantitative PCR, the protein level of CYP27B1 was quantified by western blotting, and the serum level of 25(OH) D was determined by an enzyme-linked immunosorbent assay. Results: The mRNA expression of CYP27B1 in PBMCs was significantly lower in SLE patients than in HCs (p < 0.001), and the protein quantification confirmed that CYP27B1 expression was lower in SLE patients than in HCs (p = 0.001). Among SLE patients, the prevalence of lupus nephritis was higher in a subgroup with lower CYP27B1 mRNA expression than in a subgroup with normal CYP27B1 mRNA expression (41.07% vs. 14.28%, p = 0.028). The mRNA expression of CYP27B1 negatively correlated with the Systemic Lupus Erythematosus Disease Activity Index (r = -0.331, p = 0.003). Serum 25(OH)D concentration was lower in SLE patients than in HCs (37.64 ± 19.89 vs. 50.58 ± 12.74 ng/mL, mean ± SD, p = 0.003). Conclusion: The expression of CYP27B1 in PBMCs may be related to SLE pathogenesis, disease activity, and nephritis.
Systemic lupus erythematosus, 1α-hydroxylase, vitamin D
LUO, MAN; LIU, JING; YUAN, YESHUANG; CHEN, YONG; and YUAN, GUOHUA
"The role of vitamin D-synthesizing enzyme CYP27B1 in systemic lupus erythematosus,"
Turkish Journal of Medical Sciences: Vol. 52:
4, Article 14.
Available at: https://journals.tubitak.gov.tr/medical/vol52/iss4/14