title: Administration of olanzapine as an antiemetic agent changes glucose homeostasis in cisplatin-treated rats.
abstract: We investigated the effects of olanzapine on cisplatin-induced pica (the consumption of non-nutrient materials such as kaolin) and glucose homeostasis in rats to clarify the effects of olanzapine when used as an anti-emetic drug. Rats were injected intraperitoneally (i.p.) with either 5 mg/kg cisplatin or saline. Additionally, 2 or 10 mg/kg olanzapine were administered i.p. to the rats 10 min before the administration of cisplatin and subsequently administered every 24 h for 3 d. Kaolin and food intake was measured using an automatic monitoring apparatus. Plasma glucose levels were measured by an enzyme electrode method. The plasma levels of insulin and intact proinsulin were measured by enzyme-linked immunosorbent assay (ELISA). The proinsulin-to-insulin (P/I) ratio was calculated. Cisplatin significantly increased kaolin intake, but decreased food intake and body weight up to 72 h. Olanzapine had no effect on these parameters. Neither olanzapine nor cisplatin alone had a significant effect on the plasma levels of glucose, insulin, or proinsulin. However, a combination of olanzapine and cisplatin significantly decreased plasma insulin levels, but increased plasma intact proinsulin levels and the P/I ratio. Our results suggest that an additive deterioration of insulin-secreting beta-cell function and disturbance of glucose homeostasis should be considered during treatment of patients with olanzapine for cisplatin-induced nausea and vomiting.
authors.affiliation: Division of Pharmacotherapy, Hokkaido Pharmaceutical University School of Pharmacy.
authors.forename: Maiko
authors.initials: M
authors.lastname: Machida
authors.forename: Yuki
authors.initials: Y
authors.lastname: Miyamura
authors.forename: Takuji
authors.initials: T
authors.lastname: Machida
authors.forename: Kinuko
authors.initials: K
authors.lastname: Koyama
authors.forename: Kenji
authors.initials: K
authors.lastname: Iizuka
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hirafuji
mesh_terms: D000818:Animals; D000932:Antiemetics / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000009:adverse effects*; D001569:Benzodiazepines / Q000494:pharmacology*; D001786:Blood Glucose / Q000032:analysis*; D002945:Cisplatin / Q000009:adverse effects*; D004435:Eating; D006706:Homeostasis / Q000187:drug effects; D007616:Kaolin; D008297:Male; D009325:Nausea / Q000139:chemically induced / Q000517:prevention & control; D000077152:Olanzapine; D010842:Pica / Q000139:chemically induced / Q000517:prevention & control; D011384:Proinsulin / Q000097:blood; D017208:Rats, Wistar; D014839:Vomiting / Q000139:chemically induced / Q000517:prevention & control
chemical_list: D000932:Antiemetics; D000970:Antineoplastic Agents; D001786:Blood Glucose; D001569:Benzodiazepines; D007616:Kaolin; D011384:Proinsulin; D000077152:Olanzapine; D002945:Cisplatin