Author(s)

Shinki Murakami, Fusako Takayama, Toru Egashira, Mitsuko Imao, Akitane Mori

Department of Brain Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama.
Department of Brain Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
Department of Clinical Pharmaceutical Science, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
SAIDO Corporation, Fukuoka, Japan.

Stress ulceration is single or multiple mucosal defects with/without bleeding from the gastric mucosa during the physiologic stress. Oxidative stress (OS) is a key pathogenic factor in psychogenic stress-induced acute gastric mucosal lesion (AGML). Fermented papaya preparation (FPP) is reported to have oxygen radical scavenging activity and is effective in OS-related diseases. Here, we investigated the protective effects and the mechanism of action of FPP on stress-induced AGML in rats, induced by water immersion restraint stress (WIRS). Exposure of rats to 6-hour WIRS resulted in the appearance of splinter hemorrhages and mucosal lesions in the stomach. WIRS induced significant increase in lipid peroxidation and decrease in superoxide dismutase-like activity in both the plasma and gastric mucosa. WIRS also significantly increased myeloperoxidase activity together with Nuclear factor-kappaB (NF-kB) activation in gastric mucosa. FPP reduced all the above changes. The results suggest that oral administration of FPP provides protection against WIRS-induced acute gastric mucosal lesions through its anti-oxidative and anti-inflammatory properties.

Acute Gastric Mucosal Lesion; Fermented Papaya Preparation; Oxidative Stress; Inflammation

Murakami, S. , Takayama, F. , Egashira, T. , Imao, M. and Mori, A. (2012) Protective effect of fermented papaya preparation on stress-induced acute gastric mucosal lesion. Journal of Biophysical Chemistry, 3, 311-316. doi: 10.4236/jbpc.2012.34038.