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Allelic variation in ApoC3, ApoA5 and LPL genes and first and second generation antipsychotic effects on serum lipids in patients with schizophrenia

Abstract

Schizophrenic patients who are treated with antipsychotics, especially second generation antipsychotics, such as clozapine and olanzapine, manifest an increase in cholesterol and triglycerides as well as other changes associated with diabetes or the metabolic syndrome. Previous studies have shown that polymorphisms in several genes that regulate lipid metabolism can influence the levels of these lipids and response to drug treatment. We have investigated in an exploratory study whether polymorphisms in the apolipoprotein C-III (ApoC3), apolipoprotein A-V gene (ApoA5) and lipoprotein lipase genes influence differential lipid response to treatment with three second generation antipsychotics—olanzapine, clozapine and risperidone—or treatment with a first generation antipsychotic. A total of 189 patients with schizophrenia or schizoaffective disorder who were being treated with a single antipsychotic were studied in a cross-sectional study design in which fasting serum cholesterol and triglycerides and selected single-nucleotide polymorphosms (SNPs) in the three lipid metabolism genes were assessed. The treatment with antipsychotic monotherapy makes drug haplotype ascertainment less complex. Our analyses showed several nominally significant drug × gene and drug × haplotype interactions. The rarer C allele or the ApoA5_1131 (T/C) SNP was associated with higher cholesterol levels in patients treated with first generation antipsychotics and lower cholesterol levels in patients treated with olanzapine or clozapine. The rarer C allele of the ApoA5_SW19 (G/C) SNP was associated with higher cholesterol in risperidone-treated patients. An ApoA5 CG haplotype was associated with decreased cholesterol in olanzapine- or clozapine-treated patients and higher cholesterol in patients treated with first generation antipsychotics. The presence of the rarer T allele of the ApoC3_1100 (C/T) SNP or the presence of the ApoC3 TG haplotype was associated with decreased triglyceride levels in patients treated with olanzapine or clozapine and a nonsignificant trend for increased triglycerides in patients treated with first generation antipsychotics. The presence of the ApoC3 CC haplotype was associated with increased triglycerides in patients treated with olanzapine or clozapine. The overall magnitude of the effects was not large. These results provide a potential initial step toward a pharmacogenetic approach to selection of antipsychotic treatment which may help minimize the side effect of increases in serum lipids.

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Acknowledgements

This study was supported in part by an Independent Investigator Grant from Eli Lily, RS (MD PhD), Principal Investigator. RS designed the study and all study procedures, statistical analyses and manuscript preparation were carried out independently by Dr Smith and his coauthors. Dr Jan Volavka, Dr Les Citrome and Ms Linda Kline provided assistance in implementing the study at one of the three sites (Nathan Kline Institute). Dr Nigel Bark provided assistance in implementing the study at one of the three sites (Bronx Psychiatric Center). Dr Jean-Pierre Lindenmayer, Dr Sumathi Vaidhyanathaswamy and Dr Amaresh Khandat provided assistance in implementing the study at one of the three sites (Manhattan Psychiatric Center).

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Correspondence to R C Smith.

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Dr Smith has received research grants and travel support from Eli Lilly. The co-authors report no potential conflicts of interest in regard to the study.

Supplementary Information accompanies the paper on the The Pharmacogenomics Journal website (http://www.nature.com/tpj)

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Smith, R., Segman, R., Golcer-Dubner, T. et al. Allelic variation in ApoC3, ApoA5 and LPL genes and first and second generation antipsychotic effects on serum lipids in patients with schizophrenia. Pharmacogenomics J 8, 228–236 (2008). https://doi.org/10.1038/sj.tpj.6500474

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