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Effect of aging on gastric mucosal defense mechanisms: ROS, apoptosis, angiogenesis, and sensory neurons

Cited 43 time in Web of Science Cited 44 time in Scopus
Authors
Kang, Jung Mook; Kim, Nayoung; Kim, Joo-Hyon; Oh, Euichaul; Lee, Byoung Hwan; Park, Ji Hyun; Nam, Ryoung Hee; Lee, Hye Seung; Jung, Hyun Chae; Song, In Sung; Kim, Joo Sung; Lee, Hee Eun; Lee, Mi Kyoung; Shin, Cheol Min; Lee, Bong-Yong
Issue Date
2010-11
Publisher
AMER PHYSIOLOGICAL SOC
Citation
AMERICAN JOURNAL OF PHYSIOLOGY-GASTROINTESTINAL AND LIVER PHYSIOLOGY; Vol.299 5; G1147-G1153
Keywords
Egr-1CGRPreactive oxygen specieslipid hydroperoxideaging gastropathyPTENcaspase-3glycosaminoglycan
Abstract
Kang JM, Kim N, Kim J, Oh E, Lee B, Lee BH, Shin CM, Park JH, Lee MK, Nam RH, Lee HE, Lee HS, Kim JS, Jung HC, Song IS. Effect of aging on gastric mucosal defense mechanisms: ROS, apoptosis, angiogenesis, and sensory neurons. Am J Physiol Gastrointest Liver Physiol 299: G1147-G1153, 2010. First published August 19, 2010; doi: 10.1152/ajpgi.00218.2010.-Aging changes in the stomach lead to a decreased capacity for tissue repair in response to gastric acid. The aim of this study was to determine the mechanism associated with the increased susceptibility to injury of aging mucosa including reactive oxygen species (5), apoptosis, angiogenesis, and sensory neuron activity. Fischer 344 rats at four different ages (6, 31, 74 wk, and 2 yr of age) were studied. The connective tissue indicators [salt-soluble collagen and sulfated glycosaminoglycan (sGAG)], lipid hydroperoxide (LPO), myeloperoxidase (MPO), and hexosamine were assessed. We also evaluated the expression of early growth response-1 (Egr-1), phosphatase and tension homologue deleted on chromosome 10 (PTEN), caspase-9 (index of apoptosis), VEGF (index of angiogenesis), calcitonin gene-related peptide (CGRP, index of sensory neurons), and neuronal nitric oxide synthase (nNOS). The histological connective tissue area in the lower part of rat gastric mucosa increased with aging, with increase of salt-soluble collagen and sGAG. LPO and MPO in old rats were significantly greater than in the young rats, whereas hexosamine was significantly reduced. The old gastric mucosa had increased expression of Egr-1, PTEN, and caspase-9, whereas the VEGF, CGRP, and nNOS expression were significantly reduced. These results indicate that the lower part of rat gastric mucosa was found to be replaced by connective tissue with accumulation of oxidative products with aging. In addition, impairment of apoptosis, angiogenesis, and sensory neuron activity via the activation of Egr-1 and PTEN might increase the susceptibility of gastric mucosa to injury during aging.
ISSN
0193-1857
Language
English
URI
http://hdl.handle.net/10371/77643
DOI
https://doi.org/10.1152/ajpgi.00218.2010
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College of Medicine/School of Medicine (의과대학/대학원)Internal Medicine (내과학전공)Journal Papers (저널논문_내과학전공)
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