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HIP/PAP, a member of the reg family, is expressed in glucagon-producing enteropancreatic endocrine cells and tumors.

Abstract：

:Hepatocarcinoma-intestine-pancreas/pancreatitis-associated protein (HIP/PAP) protein, a member of the reg family, is constitutively expressed by some specialized epithelial cell subsets in the digestive tract and the pancreas. We performed a detailed analysis of the expression of HIP/PAP protein in normal digestive endocrine cells according to their localization, lineage, and differentiation stage, and in digestive endocrine tumors according to their site of origin and hormonal profile. In both adult and fetal normal tissues, HIP/PAP expression was detected only in endocrine cells of the small intestine, ascending colon, and pancreas. Two different expression patterns were identified: (a) a strong cytoplasmic labeling observed in the endocrine cells of the digestive mucosa and the outer rim of Langerhans islets specialized in the synthesis of glucagon and glucagon-like peptides; (b) a weak cytoplasmic immunoreactivity observed in the other pancreatic endocrine cell populations. HIP/PAP expression was detected in 36 of the 184 cases of digestive endocrine tumors examined; 32 of these cases (89%) were pancreatic. The 2 patterns observed in the normal state were retained: (a) a strong labeling was observed in 5% to 100% of tumor cells in 26 tumors, all expressing glucagon or glucagon-like peptides; (b) a weak labeling was present in 10 tumors, presenting various hormonal profiles. In conclusion, a strong expression of HIP/PAP is characteristic of glucagon-producing normal and neoplastic enteropancreatic endocrine cells. Our results lend further support to the concept that members of the reg family play regulatory roles in various endocrine cell populations and that their expression in endocrine cells is lineage-specific.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Hervieu V,Christa L,Gouysse G,Bouvier R,Chayvialle JA,Bréchot C,Scoazec JY

doi

10.1016/j.humpath.2006.03.005

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

1066-75

issue

8

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(06)00179-1

journal_volume

37

pub_type

杂志文章

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