title: Expression and localization of Reg IV in human neoplastic and non-neoplastic tissues: Reg IV expression is associated with intestinal and neuroendocrine differentiation in gastric adenocarcinoma.
abstract: Regenerating islet-derived family, member 4 (Reg IV) is a candidate marker for cancer and inflammatory bowel disease. In the present study, immunohistochemical analysis of Reg IV was performed in various human neoplastic (n = 289) and non-neoplastic tissues. In the stomach, foveolar epithelium was negative for Reg IV, whereas goblet cells of intestinal metaplasia and neuroendocrine cells at the base of intestinal metaplasia expressed Reg IV. Neuroendocrine cells of the small intestine and colon showed strong expression of Reg IV, whereas goblet cells of the small intestine and colon showed weak or no expression of Reg IV. Insulin-producing beta cells of the endocrine pancreas were positive for Reg IV. Among 143 gastric adenocarcinomas, Reg IV expression was detected in 42 (29.4%) and was associated with both the intestinal mucin phenotype and neuroendocrine differentiation. No association was found between Reg IV expression and clinical characteristics such as tumour stage and patient prognosis. Of 36 colorectal adenocarcinomas, 13 (36.1%) were positive for Reg IV, which was associated with tumour stage (p = 0.0379, Fisher's exact test). Expression of Reg IV was detected in 14 (93.3%) of 15 colorectal carcinoid tumours. Reg IV expression was also detected in 5 (21.7%) of 23 ductal adenocarcinomas of the pancreas. In contrast, lung cancers (n = 30) and breast cancers (n = 30) did not express Reg IV. This is the first immunohistochemical analysis of the expression and distribution of Reg IV protein in human tumours. These data suggest that Reg IV is expressed by gastrointestinal and pancreatic tumours, including adenocarcinomas and carcinoid tumours, and that Reg IV is associated with intestinal and neuroendocrine differentiation of the stomach and gastric carcinoma.
authors.affiliation: Department of Molecular Pathology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima, Japan.
authors.forename: Naohide
authors.initials: N
authors.lastname: Oue
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Mitani
authors.forename: Phyu Phyu
authors.initials: PP
authors.lastname: Aung
authors.forename: Chouhei
authors.initials: C
authors.lastname: Sakakura
authors.forename: Yukio
authors.initials: Y
authors.lastname: Takeshima
authors.forename: Mayumi
authors.initials: M
authors.lastname: Kaneko
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Noguchi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Nakayama
authors.forename: Wataru
authors.initials: W
authors.lastname: Yasui
mesh_terms: D000230:Adenocarcinoma / Q000737:chemistry*; D000236:Adenoma / Q000737:chemistry; D014408:Biomarkers, Tumor / Q000032:analysis; D015153:Blotting, Western / Q000379:methods; D001943:Breast Neoplasms / Q000737:chemistry; D002276:Carcinoid Tumor / Q000737:chemistry; D002454:Cell Differentiation / Q000502:physiology; D045744:Cell Line, Tumor; D003106:Colon / Q000378:metabolism; D015179:Colorectal Neoplasms / Q000737:chemistry; D005260:Female; D005753:Gastric Mucosa / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D007421:Intestine, Small / Q000378:metabolism; D037181:Lectins, C-Type / Q000032:analysis*; D008175:Lung Neoplasms / Q000737:chemistry; D009363:Neoplasm Proteins / Q000032:analysis*; D010179:Pancreas / Q000378:metabolism; D010190:Pancreatic Neoplasms / Q000737:chemistry; D000073718:Pancreatitis-Associated Proteins; D010641:Phenotype; D012333:RNA, Messenger / Q000032:analysis; D012334:RNA, Neoplasm / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013274:Stomach Neoplasms / Q000737:chemistry*
chemical_list: D014408:Biomarkers, Tumor; D037181:Lectins, C-Type; D009363:Neoplasm Proteins; D000073718:Pancreatitis-Associated Proteins; C428528:REG4 protein, human; D012333:RNA, Messenger; D012334:RNA, Neoplasm