title: Expression of claudins in the normal canine gastric mucosa.
abstract: The aim of the present study was to investigate the expression pattern of claudin-1, -2, -3, -4, -5, -7, -8, -10 and -18 in the intact fundic and pyloric gastric mucosa of dogs. Intense, linear, membranous claudin-18 positivity was detected in the surface gastric cells and in the epithelial cells of the gastric glands both in the fundic and pyloric stomach regions. The mucous neck cells in the apical part of the glands, furthermore the parietal cells and chief cells of the basal part of the gland were all positive for claudin-18, in the same way as the enteroendocrine cells. Cells of the basal part of the pyloric glands showed intense, linear, membranous claudin-2 positivity, but cells of the superficial portion of these glands and the surface gastric cells in this region were claudin-2 negative. Fibroblasts, endothelial cells, lymphocytes of the propria layer, smooth muscle cells and vegetative neurons were all negative for claudin-2. All gastric epithelial cells were negative for claudin-1, -3, -4, -5, -6, -7, -8 and -10. The endothelial cells of the propria layer had intense claudin-5 positivity. We assume that claudin-18 forms a paracellular barrier against gastric acid in the healthy canine stomach, in the same way as in mice.
authors: Szent István University Department and Clinic of Internal Medicine, Faculty of Veterinary Science István u. 2 Budapest H-1078 Hungary.
authors: Roland
authors: R
authors: Psáder
authors: Szent István University Department of Pathology and Forensic Veterinary Medicine, Faculty of Veterinary Science Budapest Hungary.
authors: Csaba
authors: C
authors: Jakab
authors: Szent István University Department and Clinic of Internal Medicine, Faculty of Veterinary Science István u. 2 Budapest H-1078 Hungary.
authors: Akos
authors: A
authors: Máthé
authors: Szent István University Department of Pathology and Forensic Veterinary Medicine, Faculty of Veterinary Science Budapest Hungary.
authors: Gyula
authors: G
authors: Balka
authors: Szent István University Department and Clinic of Internal Medicine, Faculty of Veterinary Science István u. 2 Budapest H-1078 Hungary.
authors: Kinga
authors: K
authors: Pápa
authors: Szent István University Department and Clinic of Internal Medicine, Faculty of Veterinary Science István u. 2 Budapest H-1078 Hungary.
authors: Agnes
authors: A
authors: Sterczer
keywords: Gastric mucosa; claudins; dogs; immunohistochemistry