Abstract
Olanzapine, an atypical antipsychotic medication, has been associated with weight gain and metabolic toxicity, especially in long term usage. Carnosic acid (CA), a major constituent of rosemary extract, has been shown to improve metabolic abnormalities. In this experiment, the effect of CA on olanzapine-induced obesity and metabolic toxicity has been evaluated. Female Wistar rats were divided into six groups. (1) control; (2) olanzapine (5 mg/kg/day, IP); (3, 4 and 5) olanzapine (5 mg/kg/day, IP) plus CA (5, 10 and 20 mg/kg/day, gavage) and (6) CA (20 mg/kg/day, gavage). Bodyweight and food intake were measured during the study. After 14 days, mean systolic blood pressure (MSBP), glycemia, serum lipid profile, the serum concentration of leptin, insulin, AMPK, P-AMPK, and P-ACC liver protein levels were evaluated. The mean weight in the group received olanzapine increased by 4.8 g at the end of the study. The average food intake was increased by olanzapine. Olanzapine increased triglyceride, fasting blood glucose (FBG), and leptin levels. It increased MSBP and down-regulated P-AMPK/AMPK ratio and P-ACC protein levels. CA (three doses) decreased body weight gain and reduced average food intake at 10 and 20 mg/kg. CA especially at the highest dose decreased the changes in lipid profile, FBG, leptin level, and MSBP. P-AMPK/AMPK and P-ACC protein levels were increased by carnosic acid. In conclusion, the activation of AMPK by CA can be proposed as a key mechanism against olanzapine-induced metabolic toxicity where the activation of AMPK increases fat consumption and regulates glucose hemostasis in the liver.
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Acknowledgements
The authors are thankful to the National Institute for Medical Research Development (Grant No.:943698) and Mashhad University of Medical Sciences for financial supports. The results described in this paper were part of a student thesis.
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HH conceived the idea and designed the experiments. ARA performed the experiments and analyzed the data. BMR and MR wrote the manuscript. HH gave all the critical revisions. All authors read and approved the final manuscript.
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Razavi, B.M., Abazari, A.R., Rameshrad, M. et al. Carnosic acid prevented olanzapine-induced metabolic disorders through AMPK activation. Mol Biol Rep 47, 7583–7592 (2020). https://doi.org/10.1007/s11033-020-05825-5
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DOI: https://doi.org/10.1007/s11033-020-05825-5