Distribution and relative frequency of immunohistochemically detected endocrine cells in the stomach of New Zealand White rabbit (Oryctolagus cuniculus)

Document Type : Full paper (Original article)

Authors

1 Department of Biology, Faculty of Science and Art, Süleyman Demirel University, 32260, Isparta, Turkey

2 Department of Biology, Faculty of Science and Art, Mehmet Akif Ersoy University, 15100, Burdur, Turkey

Abstract

Background: Gastrointestinal (GI) endocrine cells produce many GI hormones that perform various physiological functions of the digestive system. Aims: We aimed to investigate the presence and distribution of immunoreactive (IR) endocrine cells to glucagon, somatostatin, cholecystokinin-8 (CCK-8), serotonin, secretin and histamine in the stomach of adult male New Zealand White rabbit (Oryctolagus cuniculus). Methods: For immunohistochemical staining, peroxidase anti-peroxidase (PAP) method was applied to stomach samples. Results: Glucagon-IR cells of closed- and open type were found throughout all the stomach parts examined. Somatostatin-IR cells of closed- and open type in the cardiac and oxyntic glands were localized to deep portions of foveola gastrica. CCK-8 IR cells that were not observed in the cardia and fundus were mostly localized to the glands and lamina epithelialis in the pyloric part near the duodenum. Oval-shaped open and closed type serotonin-IR cells were mostly dispersed throughout the fundic and pyloric glands. Secretin-IR cells were rare in the pyloric and cardiac region although they were not observed in the fundic glands. Histamine-IR cells were rarely found in the cardia, fundus and pylorus. Conclusion: Our findings show that glucagon, histamine, somatostatin, secretin and serotonin might be produced by all the stomach regions while pyloric region had only CCK-8 IR. These distribution patterns also provide further evidence of species-specific differences, which might be important from the evolutionary aspect of the digestive tract in relation to evolutional niches and nutrient resources.

Keywords


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