Intercellular adhesion molecule-1 gene K469E polymorphism and ischemic stroke: a case-control study in a Chinese population

Background Intercellular adhesion molecule-1 (ICAM-1) was involved in the pathogenetic mechanisms responsible for ischemic stroke (IS). Population-based sample have revealed gene-gender interaction in blood pressure which is major risk for IS. We sought to evaluate whether ICAM-1 K469E polymorphism was involved in the causation of IS and whether it was different between female and male. Methods A 1:1 case-control study was conducted. The K469E polymorphism of ICAM-1 gene were analyzed by polymerase chain reaction (PCR) and restriction enzyme analysis in Chinese patients with IS (n = 309) and elderly subjects without IS (n = 309). Results ICAM-1 K469E polymorphism was significantly associated with IS. Interestingly, a further analysis stratified by sex found that there was significance between 469E genotypes and IS in female, but not in male. Multiple regression analysis revealed that ICAM-1 K469E polymorphism was still significantly associated with IS, compared with ICAM-1 KK genotype in all population (OR = 1.60, P = 0.030). Stratified by sex, EE combined EK was contributory factor to IS in female (OR = 3.03, P = 0.004), but not in male. After adjustment for confounding factors, the interaction between female and ICAM-1 EK/EE genotypes was found (OR = 3.54, P = 0.001). Conclusions It is suggested that the ICAM-1 469E allele may be important in the pathogenesis of ischemic stroke, especially in female but not in male. Xiao-Xia Li and Jian-Ping Liu have contributed equally.