Vincristine delays gastric emptying and gastrointestinal transit of liquid in awake rats

Brazilian Journal of Medical and Biological Research

A.a. Peixoto Júnior¹  B.c.v Teles¹  E.f.b. Castro¹  A.a. Santos¹  G.r. De Oliveira¹  R.a. Ribeiro¹  F.h. Rola¹  F.a.a. Gondim¹ 

[1] ,Universidade Federal do Ceará Departamento de Fisiologia e Farmacologia

关键词: Constipation;    Gastrointestinal transit;    Peripheral neuropathy;    Rat gastric emptying;    Vincristine;   

DOI  :  10.1590/S0100-879X2009000600015

来源: SciELO

【 摘 要 】

We evaluated the effects of vincristine on the gastrointestinal (GI) motility of awake rats and correlated them with the course of vincristine-induced peripheral neuropathy. Vincristine or saline was injected into the tail vein of male Wistar rats (180-250 g) on alternate days: 50 µg/kg (5 doses, N = 10), 100 µg/kg (2, 3, 4 and 5 doses, N = 49) or 150 µg/kg (1, 2, or 5 doses, N = 37). Weight and stool output were measured daily for each animal. One day after completing the vincristine treatment, the animals were fasted for 24 h, gavage-fed with a test meal and sacrificed 10 min later to measure gastric emptying (GE), GI transit and colon weight. Sensory peripheral neuropathy was evaluated by hot plate testing. Chronic vincristine treatments with total cumulative doses of at least 250 µg/kg significantly decreased GE by 31-59% and GI transit by 55-93%. The effect of 5 doses of vincristine (150 µg/kg) on GE did not persist for more than 1 week. Colon weight increased after 2 and 5 doses of vincristine (150 µg/kg). Fecal output decreased up to 48 h after the fifth dose of vincristine (150 µg/kg). Vincristine decreased the heat pain threshold 1 day after 5 doses of 50-100 µg/kg or after 3-5 doses of 150 µg/kg. This effect lasted for at least 2 weeks after the fifth dose. Chronic intravenous vincristine treatment delayed GE and GI transit of liquid. This effect correlated with the peak increase in colon weight but not with the pain threshold changes.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License