European Journal of Clinical Pharmacology

, Volume 66, Issue 11, pp 1109–1117

The role of CYP2D6 and ABCB1 pharmacogenetics in drug-naïve patients with first-episode schizophrenia treated with risperidone

  • Nikolina Jovanović
  • Nada Božina
  • Mila Lovrić
  • Vesna Medved
  • Miro Jakovljević
  • Alma Mihaljević Peleš
Pharmacogenetics

Abstract

Purpose

To evaluate the role of cytochrome 450 2D6 (CYP2D6) and ABCB1 variants on plasma risperidone concentrations and treatment response in 83 drug-naive patients experiencing a first episode of psychosis.

Methods

All patients were treated with risperidone for 8 weeks. The CYP2D6 genotyping was performed by allele-specific PCR–restriction fragment length polymorphism analysis (for alleles *3,*4,*6) and long-distance PCR (for duplications and allele *5), while real-time PCR analysis was used for the ABCB1 G2677T/A and C3435T variants. Plasma concentrations of risperidone and 9-OH risperidone were measured by high-performance liquid chromatography.

Results

The number of patients with the CYP2D6 wild type (wt)/wt, wt/mutation (mut) and mut/mut genotype was 43, 32 and 8, respectively. The number of patients with the ABCB1 2677G/G, G/T and T/T variants was 29, 42 and 12, respectively; those with the 3435CC, C/T and T/T variants was 25, 37 and 21, respectively. The CYP2D6 genotype had a strong effect on the steady-state dose-corrected plasma levels (C/D) of risperidone, its 9-OH metabolite and the active moiety, while the ABCB1 2677 T/T and 3435 T/T genotypes has similarly strong effects on the active moiety C/D. The CYP2D6 poor metabolizers had a significantly higher risperidone C/D and active moiety C/D and lower 9-OH risperidone C/D. The ABCB1 3435 T allele and the ABCB1 2667 T-3435 T haplotype carriers were more frequent among subjects without extrapyramidal syndromes. Patients showed significant improvements in positive and general symptoms, but not in negative symptoms. These changes were not related to variations in genetic and drug concentration data.

Conclusion

Our findings suggest that CYP2D6 and ABCB1 G2677T and C3435T may be useful determinants of risperidone plasma concentrations, but the clinical implications of these associations in relation to treatment response and side-effects remain unclear.

Keywords

Risperidone 9-hydroxirisperidone CYP2D6 ABCB1 Schizophrenia 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Nikolina Jovanović
    • 1
  • Nada Božina
    • 2
  • Mila Lovrić
    • 2
  • Vesna Medved
    • 1
  • Miro Jakovljević
    • 1
  • Alma Mihaljević Peleš
    • 1
  1. 1.Department of Psychiatry, University of Zagreb School of Medicine University Hospital CenterZagrebCroatia
  2. 2.Clinical Institute of Laboratory DiagnosisUniversity Hospital Center ZagrebZagrebCroatia

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