Mucosal protective activity of activated aluminum complex

Area of Science:

• Gastroenterology
• Pharmacology
• Materials Science

Background:

• Antacids are commonly used to treat acid-related gastrointestinal disorders.
• The acid-neutralizing capacity of antacids is their primary mechanism of action.
• Emerging evidence suggests antacids may possess additional mucosal protective properties.

Purpose of the Study:

• To evaluate the mucosal protective potential of an acidified antacid preparation, termed activated aluminum complex.
• To compare the efficacy and duration of action of activated aluminum complex against its parent antacid, ES Riopan.
• To investigate the mechanism underlying the mucosal protective activity of activated aluminum complex.

Main Methods:

• ES Riopan antacid was acidified ex vivo to pH 2.5 to create activated aluminum complex, eliminating buffering capacity.
• Gastric lesions were induced in rats using acidified aspirin and ethanol.
• The protective effects and duration of action of activated aluminum complex and ES Riopan were assessed by lesion quantification.

Main Results:

• Activated aluminum complex demonstrated 8.2 times greater potency than ES Riopan in preventing acidified aspirin-induced gastric lesions.
• The duration of action for activated aluminum complex exceeded 10 hours, significantly longer than ES Riopan's 6-hour activity.
• Activated aluminum complex inhibited both acid- and non-acid-mediated ulcers and its activity was unaffected by indomethacin pretreatment.

Conclusions:

• The non-buffering activated aluminum complex exhibits significantly enhanced and prolonged mucosal protective activity compared to its parent antacid.
• The protective effect is likely attributed to the hexaaquoaluminum cation, suggesting a mechanism independent of acid neutralization.
• These findings support the hypothesis that antacids possess intrinsic mucosal protective effects beyond their acid-suppressing capabilities.