Abstract:
BACKGROUND:Indomethacin (IND) is a widely used non-steroidal anti-inflammatory agent in the treatment of various inflammatory disorders, which causes gastrointestinal injury in humans and animal experiments. Vitamin A and beta-carotene prevent the IND-induced gastric mucosal injury. These compounds modify the membrane-bound ATP-dependent energy systems. The aims of this investigation were: (1) To study the IND-induced gastric mucosal damage and its prevention by vitamin A and beta-carotene; (2) to measure the biochemical compounds of the gastric mucosa ATP, ADP, ATP/ADP, AMP, ATP+ADP+AMP, 'energy charge' (ATP + 0.5 ADP)/(ATP+ADP+AMP), cAMP, lactate under the circumstances mentioned above; (3) to analyze the extra- and intracellular regulatory mechanisms between the membrane-bound ATP-dependent energy systems. METHODS:The observations were carried out with CFY (Sprague-Dawstrein rats, weighing 180-210 g). The gastric mucosal damage was produced by IND (20 mg/kg sc. administration) and it was prevented by vitamin A (or beta-carotene), given in doses of 0.01-0.1 to 1.0-10.0 mg/kg ig. Different biochemical compounds (ATP, ADP, AMP, cAMP, lactate) and parameters (ATP/ADP, adenylate pool, 'energy charge') were measured and calculated. RESULTS:(1) Vitamin A and beta-carotene prevented dose-dependently the IND-induced gastric mucosal damage; (2) the extent of ATP-ADP transformation was increased significantly, while the ATP-cAMP decreased in the gastric mucosa after IND-treatment; (3) vitamin A and beta-carotene enhanced the extent of ATP-cAMP transformation, while the ATP-ADP transformation was inhibited (the actions were dose-dependent responses); (4) No change was found in 'energy charge' by IND, while its value decreased significantly with vitamin A and beta-carotene. CONCLUSIONS:(1) A very complex extra- and intracellular feedback mechanism system exists in the gastric mucosa during IND, IND + vitamin A, and IND + beta-carotene treatments; (2) The gastric mucosal preventive effect of vitamin A and beta-carotene only partly depend on their scavenger properties.
journal_name
Inflammopharmacologyjournal_title
Inflammopharmacologyauthors
Mózsik G,Rumi G,Bódis B,Figler M,Király A,Sütõ G,Vincze Adoi
10.1007/s10787-999-0012-1subject
Has Abstractpub_date
1999-01-01 00:00:00pages
287-95issue
3eissn
0925-4692issn
1568-5608journal_volume
7pub_type
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