Alterations in gastric mucosal lineages induced by acute oxyntic atrophy in wild-type and gastrin-deficient mice.
In addition to their role in gastric acid secretion, parietal cells secrete a number of growth factors that may influence the differentiation of other gastric lineages. Indeed, oxyntic atrophy is considered the most significant correlate with increased risk for gastric adenocarcinoma. We studied the alterations in gastric mucosal lineages elicited by acute oxyntic atrophy induced by treatment of C57BL/6 and gastrin-deficient mice with the parietal cell protonophore [S-(R*,S*)]-N-[1-(1,3-benzodioxol-5-yl)butyl]-3,3-diethyl-2-[4-[(4-methyl-1-piperazinyl)carbonyl]phenoxy]-4-oxo-1-azetidinecarboxamide (DMP-777). In both wild-type and gastrin knockout mice, DMP-777 elicited the rapid loss of parietal cells within 2 days of treatment. In wild-type mice, oxyntic atrophy was accompanied by a rapid increase in 5-bromo-2'-deoxyuridine-labeled proliferative cells and attendant increase in surface cell numbers. However, gastrin knockout mice did not demonstrate significant foveolar hyperplasia and showed a blunted proliferative response. After 7 days of treatment in wild-type mice, a second proliferative population emerged at the base of fundic glands along with the development of a mucous cell metaplasia expressing TFF2/spasmolytic polypeptide (SPEM). However, in gastrin knockout mice, SPEM expressing both TFF2 mRNA and protein developed after only 1 day of DMP-777 treatment. In wild-type mice, all changes induced by DMP-777 were reversed 14 days after cessation of treatment. In gastrin-deficient mice, significant SPEM was still present 14 days after the cessation of treatment. The results indicate that foveolar hyperplasia requires the influence of gastrin, whereas SPEM develops in response to oxyntic atrophy independent of gastrin, likely through transdifferentiation of chief cells.
Nomura
Sachiyo
S
Nashville VA Medical Center, Department of Surgery, Epithelial Biology Program, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA.
Yamaguchi
Hirokazu
H
Ogawa
Masako
M
Wang
Timothy C
TC
Lee
Jeffrey R
JR
Goldenring
James R
JR
D000818:Animals; D001284:Atrophy / Q000139:chemically induced / Q000378:metabolism / Q000503:physiopathology; D001384:Azetidines / Q000494:pharmacology; D001692:Biological Transport; D019070:Cell Lineage / Q000187:drug effects / Q000502:physiology*; D005753:Gastric Mucosa / Q000187:drug effects / Q000378:metabolism / Q000473:pathology*; D005755:Gastrins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D015870:Gene Expression; D007437:Intrinsic Factor / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009077:Mucins / Q000378:metabolism; D009124:Muscle Proteins / Q000378:metabolism; D010295:Parietal Cells, Gastric / Q000187:drug effects / Q000378:metabolism / Q000473:pathology*; D010455:Peptides / Q000378:metabolism; D010879:Piperazines / Q000494:pharmacology; D000071164:Trefoil Factor-2
D001384:Azetidines; D005755:Gastrins; D009077:Mucins; D009124:Muscle Proteins; D010455:Peptides; D010879:Piperazines; C481546:TFF2 protein, mouse; D000071164:Trefoil Factor-2; C105999:DMP 777; D007437:Intrinsic Factor