Expression of retinoid receptors in multiple cell lineages in the gastric mucosae of mice and humans.

Abstract:

BACKGROUND AND AIM:In mice and humans, the gastric epithelial progenitors undergo proliferation and bipolar migration from the isthmus associated with their differentiation into mucus-, acid- and pepsinogen-secreting cell lineages. Little is known about factors that control the dynamics of these isthmal progenitor cells. Retinoids have long been known as chemopreventive agents against gastric mucosal damage and carcinogenesis. The aim of the present study was to examine the cellular localization of the various retinoid receptors proteins (RAR and RXR) in the gastric epithelium of mice and humans. METHODS:Gastric antral biopsies of normal individuals and the oxyntic and antral regions of the mouse stomach were processed for immunohistochemistry using anti-RAR and anti-RXR antibodies. To label the progenitor cell zone, some sections were also probed with antibodies specific for proliferating cell nuclear antigen. RESULTS:The immunoprobed oxyntic mucosal sections of the mice showed that RXRbeta protein was present in the epithelial isthmal cells, neck cells, zymogenic cells and some pit and parietal cells. In addition, RARbeta was found in isthmal and neck cells, and RARgamma was mainly found in neck cells. In the mouse antrum, only RXRbeta was detected in the isthmal cells and their pit and gland cell descendents. In humans, immunoprobed antral sections showed that RARbeta, RARgamma, RXRalpha and RXRgamma proteins are expressed in the isthmal, pit and gland cells. CONCLUSIONS:Retinoid receptors are expressed in multiple cell lineages of the mouse and human gastric epithelium and may, therefore, account for the possible effects of retinoids on gastric epithelial cell proliferation and differentiation.

authors

Karam SM,Hassan WM,John R

doi

10.1111/j.1440-1746.2005.04064.x

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

1892-9

issue

12

eissn

0815-9319

issn

1440-1746

pii

JGH4064

journal_volume

20

pub_type

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