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Decreased interstitial FOXP3(+) lymphocytes in usual interstitial pneumonia with discrepancy of CXCL12/CXCR4 axis.

Abstract：

:Regulatory T cells (Treg) play a critical role in immune homeostasis and expansion of Treg is controlled by chemokine receptors. The chemokine CXCL12 and its G-protein-coupled receptor (CXCR4) are involved in the development of idiopathic pulmonary fibrosis (IPF), but the association of Treg with the CXCL12/CXCR4 axis has not been documented. The aim of this study is to determine the distribution and extent of CXCL12/CXCR4 expression in idiopathic type of pulmonary fibrosis, and the relation of Treg expansion in the interstitium of pulmonary fibrosis patients to CXCL12/CXCR4 expression. CXCL12 expression was examined by immunostaining and ELISA in tissue specimens from patients with usual interstitial pneumonia (UIP, n=15), patients with fibrotic non-specific interstitial pneumonia (f-NSIP, n=4), and controls (n=6). CXCR4 expression was examined by in situ hybridization and immunoblotting. Expression of CD45, CD3, CD20, transcription factor forkhead box P3 (FOXP3), and CD25 was assessed by immunostaining. Fibrosis was evaluated by determining the established fibrosis (EF) score. The CXCL12/CXCR4 axis was upregulated in UIP and f-NSIP, and CXCL12 derived from lung tissue attracted CXCR4(+) cells. CXCR4(+) cells showed a CD3(+) cell distribution pattern. The interstitial FOXP3(+)/CD3(+) and CD25(+)/CD3(+) cell ratios were lower in UIP than f-NSIP, but the CXCR4(+)/CD3(+) cell ratio was not different. The FOXP3(+)/CD3(+) cell ratio and EF score were inversely correlated. These findings suggest that the CXCL12/CXCR4 axis contributes to inflammation in UIP and f-NSIP by promoting the accumulation CXCR4(+) lymphocytes, and a decrease of Treg is correlated with the severity of fibrosis in UIP.

journal_name

Int J Immunopathol Pharmacol

journal_title

International journal of immunopathology and pharmacology

authors

Shimizu Y,Dobashi K,Endou K,Ono A,Yanagitani N,Utsugi M,Sano T,Ishizuka T,Shimizu K,Tanaka S,Mori M

doi

10.1177/039463201002300207

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

449-61

issue

2

eissn

0394-6320

issn

2058-7384

pii

7

journal_volume

23

pub_type

杂志文章

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