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Inhibition of pancreatic exocrine secretion by vinblastine
Abstract:
Inbred BALB/c mice were given vinblastine sulfate (VelbeR) and/or pilocarpine hydrochloride (30 mg/kg) intraperitoneally and amylase activity was determined in the pancreas homogenate. When vinblastine was given 5 hours before measuring the pancreatic amylase content it inhibited the pilocarpine stimulated (2 hours) pancreatic secretion in a dosis-dependent fashion at doses 4, 40 and 400 mg/kg. Vinblastine (200 mg/kg) also delayed amylase accumulation during 3 hours in mice given vinblastine 2 hours after pilocarpine stimulation. The results support the hypothesis that faultless function and integrity of microtubules might be a prerequisite of pancreatic acinar cell secretion in vivo. Other effects of vinblastine, such as interference with amino acid metabolism, anticholinergic action, and cell injury must also be considered when interpreting the present findings form the point of view of the secretory mechanism of the pancreatic acinar cells.
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