Abstract
Several studies have shown increased rates of hyperglycemia and diabetes in schizophrenic patients treated with olanzapine. However, the underlying mechanism is poorly understood. Glucose-dependent insulinotropic polypeptide (GIP) is known to affect insulin secretion by pancreatic β cells. Recently, a meta-analysis study reported an association between a GIP receptor (GIPR) gene polymorphism (rs10423928) and insulin secretion measured by an oral glucose tolerance test (OGTT). We assessed the influence of this GIPR gene polymorphism on glucose metabolism in 60 schizophrenic patients treated with olanzapine and 103 healthy controls. The GIPR gene polymorphism was determined using TaqMan methods. We performed repeated-measures analysis of variance (ANOVA) and one-way ANOVA for the glucose and insulin levels during OGTTs in four groups divided by the GIPR gene polymorphism and cohort (schizophrenia or control). We found significant effects of the GIPR gene and cohort on the insulin levels at 30 min. Our findings suggest that schizophrenic patients with the A allele of GIPR rs10423928 are at risk of developing hyperinsulinemia when treated with antipsychotics.
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Acknowledgements
We thank Hiroshi Kusano and Nanako Yamazaki for their excellent technical assistance. This work was supported by a Health and Labour Sciences Research Grant (Research on Psychiatric and Neurological Diseases and Mental Health, H17-kokoro-002) to Dr Someya. This work was also supported by a Grant-in-Aid for Scientific Research (KAKENHI) (C) from the Japan Society for the Promotion of Research (JSPS, no. 20591362) to Dr Suzuki. The funding sources had no role in the study design, in the collection, analysis and interpretation of the data, in the writing of the report or in the decision to submit the paper for publication.
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All the authors fulfill the criteria for authorship based on their substantial contribution to the conception and design, or analysis and interpretation of data; drafting the article or revising it critically for important intellectual content; or the final approval of the version to be published. No one who fulfils these criteria has been excluded as an author. Dr Toshiyuki Someya is the guarantor for the present manuscript; he accepts full responsibility for the finished article, because he had access to all the data and controlled the decision to submit for publication.
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Ono, S., Suzuki, Y., Fukui, N. et al. Association between the GIPR gene and the insulin level after glucose loading in schizophrenia patients treated with olanzapine. Pharmacogenomics J 12, 507–512 (2012). https://doi.org/10.1038/tpj.2011.28
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DOI: https://doi.org/10.1038/tpj.2011.28
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