title: Interleukin-6 level and gene polymorphism in spontaneous miscarriage.
abstract: The aetiology of spontaneous miscarriage, the most common pregnancy complication, remains undefined. One of postulated factors involved in miscarriage pathology is interleukin 6 (IL-6). Therefore, the aim of the study was to evaluate IL-6 and interleukin 6 receptor (IL-6R) gene polymorphisms in patients with spontaneous miscarriage. One hundred fifty-seven patients diagnosed with spontaneous miscarriage and age and gestational time matched controls were included in the case-control study. In all study participants circulating IL-6 levels (chemiluminescent immunoassay) and IL6-174G>C as well as IL6R rs2228145:A>C polymorphisms were evaluated. The distribution of IL6 as well as IL6R alleles and genotypes were similar in the controls and patients with miscarriage. Only a trend of more frequent appearance of -174GC+CC and C allele in the patients with miscarriage was noted. Blood serum concentrations of IL-6 were significantly elevated in patients with miscarriage vs those with physiological pregnancy. Likewise, IL-6 concentrations differ significantly with the types of miscarriage. The highest concentrations of the cytokine was seen in subjects with incomplete miscarriage (4.28 ± 4.88 pg/ml) followed by imminent miscarriage (2.97 ± 2.42 pg/ml), and then missed miscarriage (2.07 ± 1.90 pg/ml), being significantly the lowest in missed miscarriage group. No association between the IL6 genotype and IL-6 serum concentration were noted, both in the miscarriage group and in the control group. The findings of the study support the role of IL-6 in spontaneous miscarriage irrespectively of its type. However, no correlation between circulating IL-6 and IL6 gene polymorphism, as well as IL-6 and IL-6R polymorphisms associations with spontaneous miscarriage were revealed.
authors.affiliation: Department of Experimental and Clinical Pharmacology, Pomeranian Medical University, Szczecin, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Drozdzik
authors.forename: N
authors.initials: N
authors.lastname: Szlarb
authors.forename: M
authors.initials: M
authors.lastname: Kurzawski
mesh_terms: D000022:Abortion, Spontaneous / Q000097:blood / Q000145:classification / Q000175:diagnosis / Q000235:genetics*; D000293:Adolescent; D000328:Adult; D000483:Alleles; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D015850:Interleukin-6 / Q000097:blood / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011247:Pregnancy; D011401:Promoter Regions, Genetic; D019947:Receptors, Interleukin-6 / Q000097:blood / Q000235:genetics*
chemical_list: C508600:IL6 protein, human; D015850:Interleukin-6; D019947:Receptors, Interleukin-6
keywords: IL-6 receptor; IL6; IL6R; gene polymorphism; interleukin-6; spontaneous miscarriage