title: Metformin and berberine prevent olanzapine-induced weight gain in rats.
abstract: Olanzapine is a first line medication for the treatment of schizophrenia, but it is also one of the atypical antipsychotics carrying the highest risk of weight gain. Metformin was reported to produce significant attenuation of antipsychotic-induced weight gain in patients, while the study of preventing olanzapine-induced weight gain in an animal model is absent. Berberine, an herbal alkaloid, was shown in our previous studies to prevent fat accumulation in vitro and in vivo. Utilizing a well-replicated rat model of olanzapine-induced weight gain, here we demonstrated that two weeks of metformin or berberine treatment significantly prevented the olanzapine-induced weight gain and white fat accumulation. Neither metformin nor berberine treatment demonstrated a significant inhibition of olanzapine-increased food intake. But interestingly, a significant loss of brown adipose tissue caused by olanzapine treatment was prevented by the addition of metformin or berberine. Our gene expression analysis also demonstrated that the weight gain prevention efficacy of metformin or berberine treatment was associated with changes in the expression of multiple key genes controlling energy expenditure. This study not only demonstrates a significant preventive efficacy of metformin and berberine treatment on olanzapine-induced weight gain in rats, but also suggests a potential mechanism of action for preventing olanzapine-reduced energy expenditure.
authors.affiliation: Avera Institute for Human Genetics, Avera McKennan Hospital & University Health Center, Sioux Falls, South Dakota, United States of America; Department of Psychiatry, Sanford School of Medicine, University of South Dakota, Sioux Falls, South Dakota, United States of America.
authors.forename: Yueshan
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Department of Veterinary and Biomedical Sciences, College of Agriculture & Biological Sciences, South Dakota State University, Brookings, South Dakota, United States of America.
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Young
authors.affiliation: Avera Institute for Human Genetics, Avera McKennan Hospital & University Health Center, Sioux Falls, South Dakota, United States of America; Department of Psychiatry, Sanford School of Medicine, University of South Dakota, Sioux Falls, South Dakota, United States of America.
authors.forename: Erik A
authors.initials: EA
authors.lastname: Ehli
authors.affiliation: Avera Institute for Human Genetics, Avera McKennan Hospital & University Health Center, Sioux Falls, South Dakota, United States of America.
authors.forename: Dustin
authors.initials: D
authors.lastname: Nowotny
authors.affiliation: Avera Institute for Human Genetics, Avera McKennan Hospital & University Health Center, Sioux Falls, South Dakota, United States of America.
authors.forename: Paige S
authors.initials: PS
authors.lastname: Davies
authors.affiliation: Department of Health and Nutritional Sciences, College of Education & Human Sciences, South Dakota State University, Brookings, South Dakota, United States of America.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Droke
authors.affiliation: Department of Psychiatry, Sanford School of Medicine, University of South Dakota, Sioux Falls, South Dakota, United States of America.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Soundy
authors.affiliation: Avera Institute for Human Genetics, Avera McKennan Hospital & University Health Center, Sioux Falls, South Dakota, United States of America; Department of Psychiatry, Sanford School of Medicine, University of South Dakota, Sioux Falls, South Dakota, United States of America; Department of Pharmacy Practice, College of Pharmacy, South Dakota State University, Brookings, South Dakota, United States of America.
authors.forename: Gareth E
authors.initials: GE
authors.lastname: Davies
mesh_terms: D052436:Adipose Tissue, White / Q000166:cytology; D000818:Animals; D058633:Antipyretics / Q000009:adverse effects*; D001569:Benzodiazepines / Q000009:adverse effects*; D001599:Berberine / Q000494:pharmacology*; D004435:Eating / Q000187:drug effects; D005260:Female; D007473:Ion Channels / Q000235:genetics; D008687:Metformin / Q000494:pharmacology*; D024101:Mitochondrial Proteins / Q000235:genetics; D000077152:Olanzapine; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D059467:Transcriptome / Q000187:drug effects; D000071256:Uncoupling Protein 1; D015430:Weight Gain / Q000187:drug effects*
chemical_list: D058633:Antipyretics; D007473:Ion Channels; D024101:Mitochondrial Proteins; D000071256:Uncoupling Protein 1; D001599:Berberine; D001569:Benzodiazepines; D008687:Metformin; D000077152:Olanzapine