目的:探讨瘦素受体基因Gln223Arg位点多态性与哮喘和代谢综合征之间的关系.方法:选择120例哮喘病人(A)、92例代谢综合征病人(M)、54例哮喘合并代谢综合征病人(A+M)和81例健康对照者(NC),其中哮喘组根据肺功能进一步分为轻-中度哮喘组和重度哮喘组.应用聚合酶链反应-限制性内切酶片段长度多态性(PCR-RFLP)方法测定所有受试者瘦素受体基因Gln223Arg位点基因型,ELISA法检测血清瘦素浓度,同时测定所有受试者BMI、血压、肺功能及空腹血糖.结果:①代谢综合征组和哮喘合并代谢综合征组AA+AG基因型和A等位基因频率较健康对照组显著性增高(P<0.05);②哮喘组中重度持续组AA+AG基因型和A等位基因频率较健康对照组显著增高(P<0.05);③AA+AG基因型的血浆瘦素浓度、MBI、收缩压与GG基因型比均显著升高,FEV1%、FEV1/FVC明显下降(P<0.05).结论:瘦素受体Gln223Arg位点基因多态性与哮喘和代谢综合征具有相关性,其中A等位基因可能通过瘦素抵抗诱导哮喘和代谢综合征的发生,是哮喘和代谢综合征的共同遗传易感因子.%Objective:To investigate the relationship of polymorphism of leptin receptor gene Gln223Arg with asthma and metabolic syndrome.Methods: Collected 120 asthma patients,92 metabolic syndrome patients,54 asthma combined metabolic syndrome patients and 81 normal controls.According to the severity,the asthma patients were divided into mild-medium group and severe group.The serum leptin level was measured by ELISA,the genotypes of leptin receptor were analyzed by the method of polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP),and statistcs of each subject′s MBI,blood pressure,lung function and fasting blood glucose were collected.Results: ①There were significant differences in genotype and allele frequency in leptin receptor gene Gln223Arg between the metabolic syndrome group,asthma combined metabolic syndrome group and normal control group(P<0.05).②The allele frequency and genotype in leptin receptor gene Gln223Arg were significant different between the severe asthma group and normal control group(P<0.05).③The serum leptin level,BMI and systolic blood pressure of AA+AG genotype group were significiant higher than GG genotype group(P<0.05),while the value of FEV1% and FEV1/FVC of lung function were lower than GG genotype group(P<0.05).Conclusion: Leptin receptor gene Gln223Arg polymorphism is correlated with asthma and metabolic syndrome,and by causing leptin resistance,the A allele might be the genetic factor that contribute to individual susceptibility for asthma and metabolic syndrome.
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