The expression and regulation of class II antigens in normal and inflammatory bowel disease peripheral blood monocytes and intestinal epithelium.

Abstract:

:Elevated constitutive expression of major histocompatibility (MHC) class II antigens occurs in the enterocytes of patients with IBD. It has been suggested that this aberrant expression of class II molecules may play a role in the pathogenesis of IBD. We examined two possible reasons for such a finding. 1) Heightened sensitivity of IBD enterocytes to endogenous gamma interferon (gamma IFN) and 2) enhanced endogenous secretion of gamma interferon by intestinal cells in close proximity to the enterocytes (lamina propria lymphocytes). Constitutive and gamma interferon stimulated HLA-DR and DP density on intestinal epithelial cells (IEC) and peripheral blood monocytes (PBM) from UC patients (IEC n = 13; PBM n = 20), CD patients (IEC n = 14; PBM n = 18) and non-IBD controls (IEC n = 12; PBM n = 20) were measured via flow cytometry (mean channel fluorescence). gamma IFN production by PHA stimulated and unstimulated lamina propria lymphocyte (LPL) cultures of UC patients (n = 11) CD patients (n = 8) and non-IBD controls (n = 11) was measured using a vesicular stomatitis virus/WISH cell bioassay. We found significantly greater gamma IFN secretion by IBD-derived PHA stimulated LPL than from non-IBD stimulated controls (CD = 39.4 +/- 12.4u; UC41.5 +/- 6.8u; NL = 22.4 +/- 8.3u, p less than 0.05) while gamma IFN induced HLA-DR and DP upregulation was no greater in IBD-derived IEC and PBM than in non-IBD controls.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Autoimmunity

journal_title

Autoimmunity

authors

Salomon P,Pizzimenti A,Panja A,Reisman A,Mayer L

doi

10.3109/08916939109006750

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

141-9

issue

2

eissn

0891-6934

issn

1607-842X

journal_volume

9

pub_type

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