Injury to the gastric mucosa and cellular dynamics in a rat model of duodenogastric reflux: the possible significance of gastrin induction and a heat shock protein.
Injury to the gastric mucosa caused by duodenogastric reflux (DGR) is often encountered after gastrectomy or truncal vagotomy (V) with pyloroplasty. This study was designed to investigate the histological features of the gastric mucosa under such conditions. A rat model of DGR and DGR+V was established and the thickness of the oxyntic mucosa was measured. Cellular dynamics in the presence of injury to the gastric mucosa caused by DGR were investigated by the immunohistochemical staining of bromodeoxyuridine (BrdU) and heat shock protein 70 (HSP70). The relationship between persistent hypergastrinemia and mucosal injury was also studied. Duodenogastric reflux activated the intracellular induction of HSP70 in our rat model of DGR. Hypergastrinemia was noted in the V group. Compared with values from the DGR group, the numbers of BrdU-labeled cells increased, the glandular proliferation zone expanded, and the thickness of the oxyntic mucosa was significantly higher in the DGR+V group. Compared with the DGR group, there was greater induction of HSP in the DGR+V group during the acute stage. This finding suggests that denervation of the gastric mucosa and hypergastrinemia after vagotomy may be associated with the expression of HSP.
Kubo
N
N
Department of Surgery II, Oita Medical University, Hasama-machi, Japan.
Noguchi
T
T
Takeno
S
S
Tohara
K
K
Uchida
Y
Y
Shimoda
H
H
D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D004195:Disease Models, Animal; D004383:Duodenogastric Reflux / Q000473:pathology*; D005753:Gastric Mucosa / Q000473:pathology*; D005755:Gastrins / Q000097:blood; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D007150:Immunohistochemistry; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D014628:Vagotomy
D005755:Gastrins; D018840:HSP70 Heat-Shock Proteins; D001973:Bromodeoxyuridine