Correlation between UGT1A1 Polymorphism and Neonatal Hyperbilirubinemia of Neonates in Wuhan

This study attempts to discuss the correlation between UGT1A1＊28 as uridine diphosphate glucuronosyltransferase gene promoter and coding region Gly71 Arg gene polymorphism with neonatal hyperbilirubinemia of neonates in Wuhan. A total of 168 neonates were divided into the hyperbilirubinemia group（case group, n=108） and healthy neonates group（control group, n=60）. Their DNA was obtained through blood extraction. The gene exon mutation of UGT1A1 was detected by Sanger sequencing, which revealed the relationship between UGT1A1＊28 and Gly71 Arg polymorphism with neonatal hyperbilirubinemia of neonates. The results showed that：（1） The frequency of UGT1A1＊28 allele mutation in the case group and the control group was 9.3% and 10% respectively, with the difference being not significant between the two groups（P〉0.05）.（2） The frequency of Gly71 Arg allele mutation in the case group and the control group was 35.1% and 21.7% respectively, with the difference being significant between the two groups（P〈0.01）.（3） The serum bilirubin level of Gly71 Arg mutant homozygous and heterozygous subgroups（n=66） in the case group was 302.7±31.4 μmol/L, which was significantly higher than 267.3±28.5 μmol/L of the wild subgroup（n=42）（P〈0.01）. It was suggested that the occurrence of neonatal hyperbilirubinemia of neonates in Wuhan was not associated with UGT1A1＊28 gene polymorphism, but closely with the Gly71 Arg gene polymorphism. Meanwhile, the Arg allele mutation was related to the degree of jaundice.

聚乙二醇400对黄芩苷及其主代谢物胆汁排泄的影响

目的:考察药用辅料聚乙二醇400(PEG400)对黄芩苷及其主代谢物黄芩素6-O-β-D-葡萄糖醛酸苷(B6G)胆汁排泄的影响,并分析其作用机制。方法:大鼠随机分为黄芩苷+水组与黄芩苷+PEG400组,利用10%水合氯醛(剂量4 mL·kg-1)腹腔注射诱导麻醉,制作大鼠胆管插管模型,待大鼠完全清醒后,以168 mg·kg-1剂量的黄芩苷分别给大鼠灌胃相应的黄芩苷水溶液和黄芩苷PEG400溶液,收集给药后0~12 h的胆汁,使用UPLC-MS/MS测定不同时间段药物经胆汁排泄的浓度,采用Thermo Hypersil GOLD C18色谱柱(2.1 mm×100 mm,1.9μm),流动相乙腈(A)-0.1%甲酸水溶液(B)梯度洗脱(0~9 min,90%~27%B;9~10 min,27%~90%B;10~12 min,90%B),流速0.3 mL·min^-1,柱温30℃,进样量5μL;质谱条件为电喷雾离子源(ESI),正离子检测模式。利用体外孵育法和酶联免疫吸附测定(ELISA)研究PEG400对尿苷二磷酸葡萄糖醛酸转移酶(UGT)1A8和UGT1A9活性及二者在大鼠肝脏中表达的影响。结果:与黄芩苷+水组相比,黄芩苷+PEG400组大鼠12 h内胆汁中黄芩苷及其主代谢物B6G的累积排泄量分别增加了1.8,2.1倍;PEG400分别使UGT1A8与UGT1A9的酶活性提高了2.0,1.5倍,使肝脏中UGT1A8与UGT1A9的质量分数提高了2.2,1.3倍。结论:PEG400可通过提高UGT1A8与UGT1A9的活性和表达来显著增加黄芩苷及其主代谢物B6G的胆汁排泄,且对B6G胆汁排泄的促进作用大于原形药物黄芩苷,可为PEG400的临床合理应用及黄芩苷等黄酮类药物新剂型的设计提供依据。