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Meal-induced insulin sensitization is preserved after acute olanzapine administration in female Sprague-Dawley rats

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Abstract

Olanzapine, an atypical antipsychotic, can acutely induce fasting insulin resistance, but we do not know whether it is able to modulate the meal-induced insulin sensitization (MIS). Two main experimental groups (control and olanzapine-treated) were created with two subgroups (fasted and re-fed) within each. After oral vehicle/olanzapine administration, the first meal size and duration and the total amount of consumed food was recorded in conscious rats. Then, under anaesthesia, the carotid artery and jugular vein was prepared and cannulated to obtain samples for blood glucose and hormone determination as well as for insulin/glucose infusion, respectively. Basal insulin sensitivity and MIS was determined by homeostasis model assessment (HOMA) calculation and by rapid insulin sensitivity test, respectively. In fasted animals, olanzapine increased blood glucose and plasma insulin and reduced basal insulin sensitivity, but it failed to modify other hormone levels. Postprandial leptin and glucose-dependent insulinotropic polypeptide (GIP) levels increased, and ghrelin level decreased significantly (p < 0.05) both in vehicle- and olanzapine-treated groups, but plasma insulin increased only in vehicle-treated animals. Furthermore, decrement in ghrelin level was attenuated in olanzapine-treated animals compared to controls. There was no significant change in the first meal size and duration or in the total amount of food consumed. Olanzapine had no effect on the MIS. We demonstrated that olanzapine can induce insulin resistance without weight gain in healthy rats. Furthermore, the MIS was preserved after acute olanzapine treatment. The blunted postprandial ghrelin and insulin response could contribute to the effect of olanzapine on feeding behaviour. Pharmacological induction of MIS may improve the olanzapine-induced insulin resistance.

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Acknowledgments

This study was supported by the Hungarian National Office for Research and Technology (NKFP_07-A2-2008-0260; GOP-1.1.2-07/1-2008-0004; TÁMOP-4.2.2.-08/1-2008-0014, OM-00174/2008; TÁMOP-4.2.2/B-10/1-2010-0024; TÁMOP-4.1.1.C-12/1/KONV-2012-0014, GOP-1.1.1-07/1-2008-0032 and GOP-1.2.1-08-2009-0023) and the Hungarian Scientific Research Fund (OTKA-75965).

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The authors declare that there are no any competing financial interests in relation to the present work.

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Correspondence to Barna Peitl.

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Kovács, D., Hegedűs, C., Kiss, R. et al. Meal-induced insulin sensitization is preserved after acute olanzapine administration in female Sprague-Dawley rats. Naunyn-Schmiedeberg's Arch Pharmacol 388, 525–530 (2015). https://doi.org/10.1007/s00210-015-1091-8

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