Metformin and berberine prevent olanzapine-induced weight gain in rats

PLoS One. 2014 Mar 25;9(3):e93310. doi: 10.1371/journal.pone.0093310. eCollection 2014.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipose Tissue, White / cytology
  • Animals
  • Antipyretics / adverse effects*
  • Benzodiazepines / adverse effects*
  • Berberine / pharmacology*
  • Eating / drug effects
  • Female
  • Ion Channels / genetics
  • Metformin / pharmacology*
  • Mitochondrial Proteins / genetics
  • Olanzapine
  • Organ Size / drug effects
  • Rats
  • Rats, Sprague-Dawley
  • Transcriptome / drug effects
  • Uncoupling Protein 1
  • Weight Gain / drug effects*

Substances

  • Antipyretics
  • Ion Channels
  • Mitochondrial Proteins
  • Uncoupling Protein 1
  • Berberine
  • Benzodiazepines
  • Metformin
  • Olanzapine

Grants and funding

Avera Research Institute sponsored this study. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.