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Am J Physiol Gastrointest Liver Physiol 278: G820-G827, 2000;
0193-1857/00 $5.00
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Vol. 278, Issue 5, G820-G827, May 2000

Cyclooxygenase-1 and an alternatively spliced mRNA in the rat stomach: effects of aging and ulcers

Daphne Vogiagis1, Eric M. Glare2, Aileen Misajon1, Wendy Brown1, and Paul E. O'Brien1

Departments of 1 Surgery and 2 Respiratory Medicine, Monash University Medical School, Alfred Hospital, Prahran, Victoria 3181, Australia

Prostaglandins play a critical role in gastric mucosal cytoprotection and decrease progressively with age. Cyclooxygenase (COX), the rate-limiting enzyme for prostaglandin synthesis, exists in two isoforms, COX-1 and COX-2. The rat COX-1 gene expresses an alternatively spliced mRNA COX-1 splice variant (SV) that may, at best, code for a truncated COX-1 protein. With the use of competitive PCR, we determined whether COX gene expression was altered in the stomach with increasing age and after gastric ulcer induction. COX-1 mRNA was significantly reduced in the aged, and COX-1SV mRNA was significantly higher in the adults compared with the young and aged stomach. Levels of COX-1 and COX-2 were similarly expressed in the normal stomach. In acute gastric ulcers, only COX-2 mRNA levels were significantly elevated. When ulcers were undergoing healing and repair, COX-1 and COX-2 mRNA levels were significantly elevated. Age-related changes in COX-1 and COX-1SV but not COX-2 mRNA may alter gastric mucosal cytoprotection. Furthermore, COX-1 and COX-2 may both contribute to the healing of a gastric ulcer.

splice variant; competitive PCR; gene expression; gastric ulcer; ulcer healing


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