Abstract
The aim of this study was to investigate the expression of cyclooxygenase-2 (COX-2) in eclampsia patients, and to explore the correlation between COX-2 polymorphism and incidence of eclampsia. From January 2016 to January 2018, a total of 280 pregnant women diagnosed in the Obstetrics and Gynecology Department of our hospital were selected for this study. All patients were divided into two groups, including normal pregnancy control group (n=120) and eclampsia group (n=160). The expression of COX-2 in placenta and umbilical cord tissues of eclampsia group and normal group was detected via Reverse Transcription-Polymerase Chain Reaction (RT-PCR), Western blotting and immunohistochemical staining. The single-nucleotide polymorphisms (rs1526172, rs1245231 and rs2198532) in the promoter region of the COX-2 gene were typed via conformation difference gel electrophoresis. Whether the distribution frequency of COX-2 genotypes met Hardy-Weinberg equilibrium law was detected via the Chi-square test. Meanwhile, the correlation between COX-2 alleles and gene polymorphisms and the incidence of eclampsia was analyzed. The messenger ribonucleic acid (mRNA) and protein expression levels of COX-2 in the eclampsia group were significantly higher than those of the normal group (p<0.05). According to the analysis, three polymorphisms of COX-2 gene were all in line with Hardy-Weinberg equilibrium distribution (p>0.05). Gene association analysis revealed that only polymorphisms (rs1526172 and rs1245231) and alleles were correlated with the incidence of eclampsia (p<0.05). However, polymorphism rs2198532 and alleles were not correlated with the incidence of eclampsia (p>0.05). Rs1526172 and rs1245231 in the promoter region of COX-2 are correlated with the incidence of eclampsia, while rs2198532 has no correlation with eclampsia.
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