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Type: Artigo de periódico
Title: Natural trans-crotonin: The antiulcerogenic effect of another diterpene isolated from the bark of Croton cajucara Benth.
Author: Hiruma-Lima, CA
Toma, W
Gracioso, JD
de Almeida, ABA
Batista, LM
Magri, L
de Paula, ACB
Soares, FR
Nunes, DS
Brito, ARMS
Abstract: The nor-clerodane diterpene trans-crotonin isolated from the bark of Croton cajucara BENTH. was investigated for its ability to prevent the formation of gastric-mucosa ulceration in different experimental models in mice. The results obtained from crotonin were compared with those obtained with another diterpene, DHC (trans-dehydrocrotonin) in the same models. When previously administered (p.o.) at the dose of 100 mg/kg, crotonin, as well as DHC, significantly reduced (p<0.05) gastric injury induced by stress (72, 67%), indomethacin/bethanechol (78, 29%) and pylorus ligature (35, 30%). In the HCl/ethanol-induced gastric ulcer model, at oral doses of 100 and 250 mg/kg, crotonin significantly prevented (p<0.05) the formation of gastric lesions by 51 and 56%, respectively, when compared to the control group. Gastric injury was also of significantly less magnitude in the DHC treatment group (p<0.05). In the pylorus-ligature model, crotonin (p.o.), like cimetidine, increased the volume of gastric juice when compared to the control group (p<0.05). No significant modifications where found in gastric parameters such as pH or total acid content after oral crotonin treatment. However, systemic alterations were observed when crotonin (100 mg/kg) was previously administered intraduodenally to mice. We observed significant changes (p<0.001) in gastric-juice parameters such as an increase in volume and a decrease in gastric acidity. Those pre-treated with crotonin as well as with DHC did not increase free mucus production (p>0.05). The results suggest that crotonin presents a significant anti-ulcer effect when assessed in these ulcer-induced models. As with DHC, the antiulcerogenic effects of crotonin are probably related to anti-secretory or/and gastroprotective properties of this substance. In light of results obtained with DHC and natural trans-crotonin in the present study, we concluded that the A-ring of both diterpenes is not directly involved in the antiulcerogenic activity.
Subject: crotonin DHC
gastroprotective activity
Croton cajucara
Country: Japão
Editor: Pharmaceutical Soc Japan
Citation: Biological & Pharmaceutical Bulletin. Pharmaceutical Soc Japan, v. 25, n. 4, n. 452, n. 456, 2002.
Rights: aberto
Identifier DOI: 10.1248/bpb.25.452
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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