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Angiotensin II type 1 receptor gene polymorphism and serum angiotensin-converting enzyme level in Egyptian children with systemic lupus erythematosus.
Clinical Rheumatology 2018 December
Angiotensin II, the major effective molecule of the renin-angiotensin system, plays a vital role in the development of systemic lupus erythematosus (SLE). To study angiotensin II type 1 receptor (AT1R) gene polymorphism at (A1166C) in Egyptian children with SLE and its correlation with serum ACE level and SLE manifestations. AT1R gene polymorphism (A1166C) was done in 123 children with SLE in comparison to 100 healthy controls using polymerase chain reaction-based restriction fragment length polymorphism method (PCR-RFLP) and the tetra-primer amplification refractory mutation system-polymerase chain reaction (T-ARMS-PCR) to confirm the results of the genotyping. Serum ACE level measurement was done using ELISA technique. The frequencies of C-containing genotypes (AC + CC) and C-allele of AT1R (A1166C) were significantly higher in SLE patients compared to controls (p < 0.0001, OR = 4.9, 95% CI = 2.7-8.8; p ˂ 0.0001, OR = 3.6, 95% CI = 2.2-5.9, respectively). Lupus nephritis (LN) patients had significantly higher frequency of (AC + CC) genotypes and C-allele compared with controls (p ˂ 0.0001, OR = 5.1, 95% CI = 2.7-9.7; p ˂ 0.0001, OR = 3.5, 95% CI = 2.1-6.02, respectively). Mean serum ACE levels were significantly higher in SLE patients compared to controls (p ˂ 0.0001). There were no associations between AT1R gene polymorphism and serum ACE level and the clinical manifestations of SLE. The AT1R gene polymorphism can be considered a risk factor for the development of SLE in Egyptian children.
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