Affiliation:
1. Department of Gastroenterology, Altınbaş University School of Medicine, İSTANBUL
2. Department of Pathology, Dokuz Eylül University School of Medicine, İZMİR
3. Department of Gastroenterology, Dokuz Eylül University School of Medicine, İZMİR
Abstract
Evaluation of GLP-2 receptor expression in gastrointestinal neuroendocrine tumors
Background and Aims: Neuroendocrine tumors arise from cells of the neuroendocrine system. These cells show both nerve and endocrine cell characteristics and can be found in many organs in the body. GLP-1 and GLP-2 are released from intestinal L cells in a 1:1 ratio following food intake. GLP-2 receptor recognizes GLP-2. GLP-2 receptor mRNA transcripts have been detected in the stomach, small and large intestine, brain, and lung. The proliferative effect of GLP-2 has been demonstrated in mice, rats, pigs, and humans by administering exogenous GLP-2. The objective is to evalaute the relation between gastroenteropancreatic neuroendocrine tumors and glukagon like peptid-2 and GLP-2 receptor. Materials and Methods: The patients, who were pathologically diagnosed with gastroenteropancreatic neuroendocrine tumor between 2006-2009 were included in the study. There were 47 patients (27 females, 20 males, avarage age: 54 ± 15.5) in the study. There were also 46 control group patients (25 females, 21 males, avarage age: 57.5 ± 14.8). Pathological tissue blocks prepared on poly-L-lysine microscope slides were stained by GLP-2 receptor antibody (1:100 - 1:200, 1 mg/ml) immunohistochemical stain. Results: GLP-2 receptor positivity of colon neuroendocrine tumor group was 30% (4/13) and colon control group was %100. GLP-2 receptor positivity of pancreas neuroendocrine tumor group was 25% (3/12) while it was 100% in pancreas control group. The comparison of colon neuroendocrine tumor and control group showed significant difference (p: 0.003). The comparison of pancreas neuroendocrine tumor and control group also showed statistically significant difference (p < 0.001). The comparison of gastric neuroendocrine tumor with the control yielded comparable results (p: 0.22). Conclusions: We concluded that GLP-2 receptor cannot be as useful as somatostatin receptors in diagnosis and treatment of these tumors. More studies are needed on this subject with different methods.
Publisher
Turkish Journal of Academic Gastroenterology
Subject
General Earth and Planetary Sciences,General Environmental Science