Abstract
In this investigation three bioactive compounds, responsible for the gastroprotective property of Amphipterygium adstringens, were purified from an active dichloromethane fraction. These compounds were 3α- hydroxymasticadienonic acid, β-sitosterol and 3-epi-oleanolic acid. The latter was the most active compound (88.8% of gastroprotection) followed by 3α-hydroxymasticadienoic acid and β-sitosterol (69.8 and 42.5% of gastroprotection, respectively). Carbenoxolone was used as positive control and it showed 88.4% of gastroprotection. Masticadienonic acid was also isolated from the active fraction, but it was unable to inhibit the ethanol-induced gastric lesions. The gastroprotection of the methanol extract was completely inhibited by the pretreatment with I-NAME and attenuated by pretreatment with indomethacin and N-ethylmaleimide. These results suggest that endogenous nitric oxide plays an important role in the gastroprotection of A. adstringens methanol extract on ethanol-induced gastric mucosal lesions and that there is partial participation by prostaglandins and endogenous sulfhydryls. The effect of 3α-hydroxymasticadienonic acid was attenuated only by pretreatment with N-ethylmaleimide, indicating that endogenous sulfhydryls (thiols) participate in its gastroprotective mechanism. Capsaicin-sensitive afferent neurons do not participate in the gastroprotection of either the methanol extract or 3α-hydroxymasticadienoic acid.
Original language | English |
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Pages (from-to) | 905-909 |
Number of pages | 5 |
Journal | Planta Medica |
Volume | 69 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2003 |
Externally published | Yes |
Keywords
- 3-epi-oleanolic acid
- 3α-hydroxymasticadienoic acid
- Amphipterygium adstringens
- Julianaceae
- Nitric oxide
- Sulfhydryl
- Ulcer
- β-sitosterol