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Chinese Journal of Clinical Pharmacology and Therapeutics ›› 2018, Vol. 23 ›› Issue (2): 154-158.doi: 10.12092/j.issn.1009-2501.2018.02.007

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Effects of OCT2 and MDR1 gene polymorphisms on vancomycin concentration and clinical efficacy in infants

CHEN Yaoyao1,SHI Daohua1,LIU Guanghua2,NIU Peiguang1,LIU Baichen1   

  1. 1 Department of Pharmacy, 2 Department of Pediatrics,Fujian Provincial Maternity and Children's Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou 350001, Fujian, China
  • Received:2017-08-03 Revised:2017-09-07 Online:2018-02-26 Published:2018-03-02

Abstract:

AIM: To study the effects of organic cation transporter 2 (OCT2) and multidrug resistance gene 1 (MDR1) gene polymorphisms on plasma concentration and clinical efficacy of vancomycin in infants. METHODS: Ninety-one infants that treated with vancomycin were recruited. The plasma concentrations of vancomycin were measured by enzyme multiplied immunoassay technique. The genotypes of OCT2 G808T (rs316019) and MDR1 C3435T (rs1045642) were determined by polymerase chain reaction followed with direct sequencing. The association between different genotypes and the concentrations and clinical efficacy of vancomycin were analyzed. RESULTS: There were 16.5% patients which the concentration reached 10-20 μg/mL. The curative effect of 5-<10 μg/mL (88%) and 10-20 μg/mL (93.3%) were significant higher than that of <5 μg/mL (44%) (P<0.05); and the curative effect of 5-<10 μg/mL and 10-20 μg/mL were similar. The plasma concentration (10.15±2.35) μg/mL and concentration/dose values (0.98±0.27) μg·mL-1·mg-1·kg of vancomycin in infants with OCT2 TT genotype were significantly increased than that of OCT2 GG genotypes (6.92±2.83) μg/mL, (0.59±0.22) μg·mL-1·mg-1·kg (P<0.05). Meanwhile, the clinical efficacy of vancomycin in TT genotype (100%) was higher than that in GG genotype (73.2%) (P<0.05). However, the concentration and clinical efficacy of vancomycin in the infants with mutant type and wild type of MDR1 C3435T were similar (P>0.05). CONCLUSION: OCT2 G808T polymorphism is associated with the plasma concentrations and clinical efficacy of vancomycin in infants.

Key words: vancomycin, drug transporter, polymorphisms, plasma concentration, infant

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