Effects of teprenone on gastric epithelial restoration in a rabbit cultured cell model

Teprenone ameliorates diclofenac-induced small intestinal injury via inhibiting protease activated receptors 1 and 2 activity

OBJECTIVE

This study aimed to investigate specific protein expression of injured intestinal mucosa induced by diclofenac, and explore the protective effects of teprenone on it.

METHODS

Intestinal damage of Sprague Dawley male rats was gradually induced by the intragastric administration of diclofenac. After the last drug administration, the intestinal mucosa was taken off with an interval of 24 h, subsequently, its general histological injury and ultrastructure were observed and analysed by a transmission electron microscope. The expression levels of PAR1 and PAR2 protein were detected by immunohistochemistry and real-time polymerase chain reaction (PCR).

RESULTS

The Reuter and Chiu scores of small intestinal damage were 5.63 ± 1.30 and 4.25 ± 0.70 respectively in the model group, which could be protected by teprenone (100 mg/kg⋅day) with the degree of 55.7% and 44%. Optical microscopy and transmission electron microscope showed that intestinal mucosa and ultrastructure were severely damaged. Distributed in the cytoplasm or aligned with the nucleus, the expression of PAR1 and PAR2 was significantly upregulated after the administration of diclofenac, while it was relieved after the treatment of teprenone.

CONCLUSION

Our study presents a new view that teprenone might protect NSAIDs-induced (diclofenac) intestinal injury via suppressing the expression of PAR1 and PAR2.

Efficacy of teprenone in treatment of chronic atrophic gastritis: an analysis of 100 cases

AIM: To explore the clinical efficacy of teprenone in the treatment of chronic atrophic gastritis (CAG).

METHODS: A total of 100 patients with CAG were chosen by endoscopic examination. A random, prospective and self control method was used. H pylori-positive patients received routine sterilization first, and then all the patients took teprenone for 24 wk. The clinical symptoms before and 4, 12 and 24 wk after therapy were evaluated, and endoscopic examination was performed before and 12 and 24 wk after therapy for pathological observation.

RESULTS: Clinical symptoms were significantly different before and after treatment (P < 0.05). The endoscopic results, pathological findings before and after therapy also had significant differences (P < 0.05). There were no marked differences in the above three aspects between H pylori-positive and -negative patients. After therapy, particles became thinner and metaplastic nodes diminished, together with obvious improvement of tissue pathology under endoscope.

CONCLUSION: Teprenone can relieve the clinical symptoms, endoscopic and pathological findings of CAG patients. Meanwhile, teprenone is convenient to use, with few side effects.

Bile acid metabolism, bacterial bowel flora and intestinal function following ileal pouch-anal anastomosis in dogs, with reference to the influence of administration of ursodeoxycholic acid

The pathophysiology following a total colectomy with ileal pouch-anal anastomosis (IPAA) has not been sufficiently clarified yet. We investigated bile acid metabolism, bacterial bowel flora and transit of the alimentary tract after IPAA, with reference to administration of ursodeoxycholic acid (UDCA) in dogs undergoing IPAA. Ten adult beagle dogs underwent IPAA at one stage, and were observed for 12 months. UDCA (100 mg/day) was administered orally to five dogs, and the other five did not. In the UDCA(+) group, UDCA replaced other bile acids, especially cholic acid, accounting for 16.5% of gallbladder bile at 12 months after surgery. Both plasma levels and postprandial increase of total bile acids remained unchanged in the UDCA(+) group, but decreased in the UDCA(-) group at 12 months. Fecal excretion of bile acids tended to be smaller in the UDCA(+) group, and the ratio of secondary to primary bile acids was larger in the UDCA(-) group. Almost all the bile acids were in free form in stool, and UDCA constituted 19% in the UDCA(+) group. The transit time of the whole alimentary tract was elongated by administering UDCA, especially at an early period after IPAA. Although both anaerobic and aerobic bacteria decreased after IPAA, the latter decreased more in stool, resulting in an increase in the ratio of total anaerobes/total aerobes, especially in the UDCA(-) group. The decrease in Bacteroidaceae and Lactobacillus after IPAA was slightly smaller in the UDCA(+) group. Administration of UDCA following IPAA was efficient to induce rapid intestinal adaptation and also to keep the bile acid fraction in the ileal pouch less harmful.