title: The -174GG interleukin-6 genotype is protective from retinopathy and nephropathy in juvenile onset type 1 diabetes mellitus.
abstract: The aim of our study was to determine an association between the -174G>C IL-6 polymorphism (rs1800795) and occurrence of retinopathy and nephropathy in type 1 diabetes mellitus (T1DM) patients. Two hundred ten children/adolescents with long-standing T1DM (16.5 +/- 3.8 y; with diabetes duration of 8.4 +/- 3.0 y) were enrolled into the study. A group of 170 healthy young (16.9 +/- 5.2 y) sex-matched volunteers was qualified as the control. The IL-6 polymorphism was genotyped with the PCR-RFLP method. Serum and urine IL-6 concentrations were measured by the ultra-sensitive ELISA tests. The -174GG genotype was under represented in the diabetic patients compared with the controls. Patients with this genotype were free from nephropathy and retinopathy. The group of -174GG carriers was characterized by the highest urine IL-6 concentrations in relation to other genotypes. In the multivariate logistic regression analysis adjusted for age, duration of the disease, age of disease onset, HbA1c, and albumin excretion rate, the -174GG genotype was the only independent variable that significantly decreased the risk of jointly analyzed retinopathy and nephropathy [OR = 0.65; 95% CI = 0.52-0.82; p = 0.0003]. We propose that the -174GG patients are protected from late diabetic complications by different IL-6 dependent mechanisms.
authors: Department of Immunology, Medical University of Gdańsk, Debinki, 80-210 Gdańsk, Poland.
authors: Jolanta
authors: J
authors: Myśliwska
authors: Katarzyna
authors: K
authors: Zorena
authors: Małgorzata
authors: M
authors: Myśliwiec
authors: Ewa
authors: E
authors: Malinowska
authors: Krystyna
authors: K
authors: Raczyńska
authors: Anna
authors: A
authors: Balcerska
mesh_terms: D000293:Adolescent; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics / Q000276:immunology / Q000473:pathology; D003928:Diabetic Nephropathies / Q000235:genetics / Q000517:prevention & control; D003930:Diabetic Retinopathy / Q000235:genetics / Q000517:prevention & control; D005260:Female; D005838:Genotype; D006801:Humans; D015850:Interleukin-6 / Q000097:blood / Q000235:genetics*; D008297:Male; D011110:Polymorphism, Genetic; D055815:Young Adult
chemical_list: D015850:Interleukin-6