Volume 58, Issue 6 pp. 518-523

Accumulation of CCR4-expressing CD4+ T cells and high concentration of its ligands (TARC and MDC) in bronchoalveolar lavage fluid of patients with eosinophilic pneumonia

S. Katoh

S. Katoh

Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki;

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K. Fukushima

K. Fukushima

Nagasaki Prefecture Tarami Hospital, Nagasaki;

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N. Matsumoto

N. Matsumoto

Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki;

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K. Matsumoto

K. Matsumoto

Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki;

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K. Abe

K. Abe

Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki;

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N. Onai

N. Onai

Department of Molecular Preventive Medicine, The University of Tokyo, Graduate School of Medicine, Tokyo, Japan

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K. Matsushima

K. Matsushima

Department of Molecular Preventive Medicine, The University of Tokyo, Graduate School of Medicine, Tokyo, Japan

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S. Matsukura

S. Matsukura

Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki;

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First published: 21 May 2003
Citations: 45
Shigeki Katoh, MD, PhD
Third Department of Internal Medicine
Miyazaki Medical College
5200 Kihara, Kiyotake
Miyazaki, 889-1692
Japan

Abstract

Background: Th2 cells are thought to be involved in eosinophilic inflammation of the lung. CC chemokine receptor 4 (CCR4) has been identified as a specific receptor for both thymus and activation-regulated chemokine (TARC) and macrophage-derived chemokine (MDC), and is preferentially expressed on Th2 cells.

Objective: Our aim was to evaluate the role of Th2 cells in the lung of patients with eosinophilic pneumonia (EP).

Methods: The concentrations of TARC, MDC, and interleukin (IL)-5 were measured in bronchoalveolar lavage fluid (BALF) by ELISA. Proportion of CCR4-expressing CD4+ T cells (CCR4+ CD4+ T cells) was determined by flow cytometry.

Results: TARC and MDC concentrations in BALF were higher in patients with EP than in normal subjects. The proportion of CCR4-expressing cells among CD4+ T cells was higher in BALF than in peripheral blood of patients with EP. There was a significant correlation between the number of CCR4+ CD4+ T cells and the levels of TARC, MDC, and IL-5 in BALF of patients with EP.

Conclusions: Our data suggest that Th2 cells, which express CCR4 and its ligands (TARC and MDC), contribute to the pathogenesis of EP in the lung.

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