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Journal of Histochemistry and Cytochemistry, Vol. 47, 1057-1062, August 1999, Copyright © 1999, The Histochemical Society, Inc.

ARTICLE

Immunocytochemical and In Situ Hybridization Studies of Gastrin After Cisplatin Treatment

Ying Wanga, Surinder K. Aggarwala, and Cory L. Paintera
a Department of Zoology, Michigan State University, East Lansing, Michigan

Correspondence to: Surinder K. Aggarwal, Dept. of Zoology, Michigan State University, East Lansing, MI 48824–1115.

Cisplatin treatment (9 mg/kg) causes bloating of the stomach, an increase in gastric acid, and ulceration in rats. Gastrin, a gut peptide, plays an important role in regulating gastric acid production. To study the role of gastrin in this increased gastric acid production after cisplatin treatment, male Wistar rats (100–150 g) were treated with cisplatin (9 mg/kg) in five divided doses over 5 consecutive days. The rats were sacrificed 1, 6, 10, or 15 days after the last treatment. As measured by immunocytochemistry, in situ hybridization, Northern blot, and dot-blot techniques, gastrin was found to be below detectable limits just 1 day after cisplatin treatment. However, 10–15 days after the last injection, the levels for both gastrin and its mRNA gradually recovered to normal. Northern blot studies showed that decreased somatostatin mRNA parallels the changes of gastrin and its mRNA. These results suggest that after cisplatin treatment the increased gastric acid production in rat stomach is independent of gastrin. This decrease of gastrin production is not under the influence of somatostatin, which also decreased after cisplatin treatment. (J Histochem Cytochem 47:1057–1062, 1999)

Key Words: gastrin, cisplatin, ulcer, immunocytochemistry, in situ hybridization, stomach, Northern blot, dot-blot, rat


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