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Nonsteroidal anti-inflammatory drugs (NSAIDs) are one of the most aggressive factors leading to inducing gastric ulcers. Natural products with lower toxicity and safety are currently sought as a potential source to minimize the effect of the gastric ulcers.<jats:italic>Perilla frutescens<\/jats:italic>or Nga-mon (in Thai) leaves are rich in rosmarinic acid (RA), which has antioxidant, anti-inflammatory, and anticancer effects. This study investigates the protective effect of ethanolic extract (EE) and aqueous fraction (AF) from<jats:italic>Perilla frutescens<\/jats:italic>leaves, which are rich in RA, on indomethacin- (IND-) induced gastric ulcer in a rat model. The EE at the doses of 50 and 500 mg\/kg body weight, AF at the doses of 50, 250, and 500 mg\/kg body weight, or famotidine (a standard drug) were administered for 14 days prior to ulcer induction. The ulceration was performed by intragastric administration of IND. Gross gastric ulcers and biological and histological parameters were examined. The pretreatment with AF had more significant effects than EE, including reduced ulcer index, decreased gastric secretion volume and decreased acidity, but it had an elevated gastric pH relative to the IND-induced gastric ulcer. In a histopathological study, the EE and AF decreased mucosal ulcer, inflammatory infiltration, and degenerative lining cells. The IND-induced expression of inflammatory mediators was significantly attenuated with EE and AF. The experiment also remarkably showed the preservation of mucus and apoptosis protection of EE and AF on a gastric mucosal ulcer. The findings demonstrated that the EE and AF of perilla leaves were capable of protecting the stomach against gastric ulcers induced by IND through anti-inflammatory and antiapoptotic mechanisms that should be further investigated. It is suggested that<jats:italic>Perilla frutescens<\/jats:italic>leaf could be a potential alternative source of RA as a therapeutic agent and food supplement for NSAID-induced gastric injuries.<\/jats:p>","DOI":"10.1155\/2019\/9514703","type":"journal-article","created":{"date-parts":[[2019,3,4]],"date-time":"2019-03-04T23:54:09Z","timestamp":1551743649000},"page":"1-13","source":"Crossref","is-referenced-by-count":46,"title":["Rosmarinic Acid Enriched Fraction from<i>Perilla frutescens<\/i>Leaves Strongly Protects Indomethacin-Induced Gastric Ulcer in Rats"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9184-7850","authenticated-orcid":true,"given":"Napapan","family":"Kangwan","sequence":"first","affiliation":[{"name":"Division of Physiology, School of Medical Sciences, University of Phayao, 56000 Phayao, 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