title: Effects of atypical antipsychotic drugs on body weight and food intake in dopamine D2 receptor knockout mice.
abstract: Many atypical antipsychotic drugs cause weight gain, but the mechanism of this weight gain is unclear. To dissect the role of the dopamine D2 receptor (D2R), an important receptor in the pharmacology of antipsychotic drugs, we analyzed the effect of olanzapine, risperidone, and ziprasidone on changes in body weight and food intake in male wild-type (WT) and D2R knockout (D2R(-/-)) mice. The oral delivery of atypical antipsychotics, olanzapine (5 and 10mg/kg), risperidone (0.1 and 1.0mg/kg) and ziprasidone (10 and 20mg/kg) in both strains mice for 2 weeks suppressed body weight gain, except for olanzapine treatment in D2R(-/-) mice. Olanzapine treatment suppressed body weight gain and decreased food intake in WT mice, but also reduced fat body mass and locomotor activity, whereas D2R(-/-) mice did not show these changes. Ziprasidone and risperidone treatment produced similar responses in WT and D2R(-/-) mice. These data suggest the involvement of D2R in the effect of olanzapine on metabolic regulation. Further studies are required to explore the implications of D2R activity in antipsychotic-mediated metabolic complications.
authors.affiliation: Korea University, Seoul, South Korea.
authors.forename: Sehyoun
authors.initials: S
authors.lastname: Yoon
authors.forename: Jai Sung
authors.initials: JS
authors.lastname: Noh
authors.forename: Se-Young
authors.initials: SY
authors.lastname: Choi
authors.forename: Ja-Hyun
authors.initials: JH
authors.lastname: Baik
mesh_terms: D000273:Adipose Tissue / Q000187:drug effects; D000818:Animals; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000009:adverse effects*; D001569:Benzodiazepines / Q000008:administration & dosage / Q000009:adverse effects*; D001835:Body Weight / Q000187:drug effects*; D004435:Eating / Q000187:drug effects*; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009043:Motor Activity / Q000187:drug effects; D000077152:Olanzapine; D010879:Piperazines / Q000008:administration & dosage / Q000009:adverse effects; D017448:Receptors, Dopamine D2 / Q000235:genetics / Q000502:physiology*; D018967:Risperidone / Q000008:administration & dosage / Q000009:adverse effects; D013844:Thiazoles / Q000008:administration & dosage / Q000009:adverse effects; D015430:Weight Gain
chemical_list: D014150:Antipsychotic Agents; D010879:Piperazines; D017448:Receptors, Dopamine D2; D013844:Thiazoles; D001569:Benzodiazepines; C092292:ziprasidone; D018967:Risperidone; D000077152:Olanzapine