Periductal induction of high endothelial venule-like vessels in type 1 autoimmune pancreatitis.

Abstract

OBJECTIVES:

Type 1 autoimmune pancreatitis (AIP) is histologically characterized by dense lymphoplasmacytic infiltration and marked storiform fibrosis, manifestations associated with pancreatic ducts. Such periductal lymphocyte recruitment is thought to be elicited by dysregulation of mechanisms governing physiological lymphocyte homing. The present study was undertaken to determine whether vascular addressins including peripheral lymph node addressin and mucosal addressin cell adhesion molecule 1 (MAdCAM-1) play a role in type 1 AIP histogenesis.

METHODS:

Tissue sections of type 1 AIP and tumor-associated non-AIP chronic pancreatitis, as well as normal pancreas, were subjected to immunohistochemical analysis using vascular addressin-related antibodies.

RESULTS:

The number of periductal mouse endothelial cell antigen 79-positive high endothelial venule (HEV)-like vessels was increased in type 1 AIP relative to that seen in non-AIP chronic pancreatitis, whereas the number of MAdCAM-1-positive HEV-like vessels did not differ between the 2 conditions. Mouse endothelial cell antigen 79 antigens are expressed on duct-forming epithelial cells not only in pancreas but also in salivary glands, which often harbor extrapancreatic lesions in type 1 AIP.

CONCLUSIONS:

Type 1 AIP can be characterized by periductal induction of MECA-79-positive HEV-like vessels. MECA-79-positive 6-sulfo sialyl Lewis X-related carbohydrate antigens expressed on duct-forming epithelial cells could be associated with type 1 AIP pathogenesis.

• Authors: Masafumi Maruyama, Motohiro Kobayashi, Yasuhiro Sakai, Nobuyoshi Hiraoka, Ayumi Ohya, Shunsuke Kageyama, Eiji Tanaka, Jun Nakayama, Toshio Morohoshi
• Journal: Pancreas (Pancreas) Vol. 42 Issue 1 Pg. 53-9 (Jan 2013) ISSN: 1536-4828 [Electronic] United States
• PMID: 22750968 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antigens, CD34
• Antigens, Surface
• Biomarkers
• Cell Adhesion Molecules
• Immunoglobulin G
• Immunoglobulins
• L-selectin counter-receptors
• MADCAM1 protein, human
• Membrane Proteins
• Mucoproteins
• Keratins

Topics

• Antigens, CD34 (analysis)
• Antigens, Surface (analysis)
• Autoimmune Diseases (metabolism, pathology)
• Biomarkers (analysis)
• Cell Adhesion Molecules
• Humans
• Immunoglobulin G (analysis)
• Immunoglobulins (analysis)
• Immunohistochemistry
• Keratins (analysis)
• Lymphatic Vessels (chemistry, pathology)
• Membrane Proteins (analysis)
• Mucoproteins (analysis)
• Pancreatic Ducts (chemistry, pathology)
• Pancreatitis (metabolism, pathology)