ABSTRACT
The role of nonprotein sulfhydryls (NP-SH) in the protective effects of honey against absolute ethanol-induced gastric lesions was studied in rats. Sucralfate and ranitidine were used as known standard gastroprotective agents. Honey orally and drugs orally or subcutaneously were administered to 24 h fasted rats 30 or 90 min before oral administration of ethanol. Mucosal damage and the glandular NP-SH levels were measured 1 h after ethanol. Both honey and sucralfate dose-dependently afforded protection against gastric damage and reversed the changes in glandular NP-SH levels induced by ethanol. Ranitidine was ineffective in this model. Pretreatment with indomethacin (IND) did not alter the protective effects of honey or the NP-SH levels, but significantly reduced the protective effects of sucralfate. On the other hand, pretreatment with N-ethylmaleimide (NEM) significantly reduced the protective effects of both honey and sucralfate and lowered the NP-SH levels. Combined IND and NEM treatment caused a significant reduction of the protective effects of honey and the NP-SH levels, but the values were not significantly different from those obtained with NEM alone. In contrast, combined IND plus NEM treatment completely abolished the protective effects of sucralfate and significantly lowered the NP-SH levels. Although these results suggest the involvement of prostaglandins (PGs) -- sensitive process in the protective effects of sucralfate, but honey and sucralfate (partially) share a common mechanisms of action in mediating the gastroprotective effects through NP-SH sensitive processes.(ABSTRACT TRUNCATED AT 250 WORDS)