ABCB1 C3435T Polymorphism Affects In Different

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ODT and NDT are further converted to lowly active N,. O-didesmethylate (NODT) by their CYPs. The aim of this study was to evaluate the influence of CYP2D6 ...
Clinical Therapeutics ABCB1 C3435T Polymorphism Affects In Different Ways The Pharmacokinetics of Antipsychotics and Antidepressants M. Saiz-Rodríguez; C. Belmonte; T. Cabaleiro; R. López-Rodríguez; M. Román; D. Ochoa; M. Talegón; and F Abad-Santos Hospital Universitario de la Princesa, Madrid, Spain Background:  P-glycoprotein, encoded by ABCB1 gene, is an ATPdependent drug efflux pump which exports substances outside the cell. The T allele of C3435T polymorphism is frequently associated with a slower metabolizer phenotype, so homozygous T/T individuals could show higher plasma levels. The aim of the present study was to evaluate the effect of this polymorphism on pharmacokinetics (PK) of 4 antipsychotics (olanzapine, quetiapine, risperidone and aripiprazol) and 3 antidepressants (trazodone, sertraline and citalopram). Methods:  445 healthy volunteers receiving a single oral dose were genotyped by real time PCR. Plasma concentrations were measured by HPLC/ MS/MS. PK parameters were calculated using non-compartmental analysis and were compared by ANOVA or T-test. Study was approved by local research ethics committee and all subjects signed an informed consent. Results:  As shown in the following table, C3435T polymorphism had no significant effect on olanzapine, quetiapine, sertraline or citalopram. As expected, T allele carriers showed a higher AUC and T1/2 for aripiprazol. Surprisingly, clearance of risperidone was higher in T carriers and clearance of trazodone was higher in T/T. ABCB1 genotype C/T+T/T

C/C

Drug (n) Olanzapine (61) Quetiapine (79) Risperidone (70) Aripiprazol (148) Trazodone (36) Sertraline (34) Citalopram (17)

AUC (ng·h/ Cl/F mL) (mL/h·kg) 300.1 172.0 64.1 1514.8 9023.7 924.8 1142.5

0.26 2.37 0.64 66.62 0.18 1.98 0.38

T1/2 (h) 32.8 4.0 6.9 47.1 9.01 26.05 32.8

AUC (ng·h/ mL) 292.8 200.0 34.3* 1675.1* 9876.1† 794.8 1350.9

Cl/F (mL/h·kg) 0.25 2.14 1.1* 62.12 0.16† 1.93 0.37

T1/2 (h)

32.6 3.91 3.6 54.4* 9.46† 24.24 34.1

* P

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