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Human duodenal epithelial cells constitutively express molecular components of antigen presentation but not costimulatory molecules.

Abstract：

:Constitutive expression of major histocompatibility complex (MHC) class II molecules by duodenal epithelial cells (EC) suggests that they can present antigen to CD4(+) T cells. However, other molecular components including invariant chain (Ii), HLA-DM, and costimulatory molecules CD80, CD86 and CD40, are required for efficient T-cell activation. We have investigated whether normal human duodenal EC possess these molecules and whether they can mediate MHC class II antigen presentation. EC were isolated from duodenal biopsies from patients in whom pathology was excluded. Freshly-isolated duodenal EC did not stimulate autologous T-cell proliferation against purified protein derivative of tuberculin. Flow cytometry and immunoblot analysis revealed that duodenal EC constitutively express HLA-DR, Ii, and HLA-DM. Surface MHC class II associated invariant chain peptide (CLIP) was not detectable, suggesting that HLA-DM functions normally in CLIP removal. Duodenal EC expressed SDS-stable HLA-DR alphabeta heterodimers, indicating that peptide binding had occurred. Surface expression of CD80, CD86 or CD40 was not detected although mRNA for these costimulatory molecules was present in all samples. These results suggest that nondiseased human duodenal EC can process and present antigen by the MHC class II pathway, but that they may induce anergy, rather than activation, of local T cells.

journal_name

Hum Immunol

journal_title

Human immunology

authors

Byrne B,Madrigal-Estebas L,McEvoy A,Carton J,Doherty DG,Whelan A,Feighery C,O'Donoghue DP,O'Farrelly C

doi

10.1016/s0198-8859(02)00436-6

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

977-86

issue

11

eissn

0198-8859

issn

1879-1166

pii

S0198885902004366

journal_volume

63

pub_type

杂志文章

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