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Analysis of regulatory T cell associated forkhead box P3 expression in the lungs of patients with sarcoidosis.

Abstract：

:In pulmonary sarcoidosis, the typical T helper 1-mediated immune response in the lungs has been proposed to be co-ordinated by regulatory T cells; however, their exact role needs to be clarified. We used real-time polymerase chain reaction to study genes involved in regulatory T cell functions in CD4+ T cells isolated from bronchoalveolar lavage fluid (BALF) of patients (n = 24) and healthy subjects (n = 7). The genes included the transcription factor forkhead box P3 (FoxP3), interleukin (IL)-10, transforming growth factor-beta1 and chemokine receptor 2 (CCR2). The same genes were also studied in isolated BALF CD4+ T cell receptor AV2S3+ and AV2S3(-) T cells of patients with lung-restricted AV2S3 T cell expansions (n = 12). Intracellular staining of the FoxP3 protein was performed additionally in 14 patients and nine healthy subjects. mRNA expression of FoxP3, CCR2 and IL-10 was decreased significantly in BALF CD4+ T cells of patients. Flow cytometric analysis of CD4+ T cells also demonstrated a decreased frequency of FoxP3+ cells in the BALF and blood of sarcoidosis patients as well as a reduced intensity (mean fluorescence intensity) of FoxP3 expression in BALF FoxP3+ cells of patients. BALF CD4+AV2S3+ T cells expressed significantly lower levels of FoxP3 and CCR2 mRNA versus BALF CD4+AV2S3- T cells. The main conclusion of our study is that there is a reduced expression of regulatory T cell associated genes in BALF CD4+ T cells in sarcoidosis. In addition, our data suggest an effector function of AV2S3+ lung-accumulated T cells in sarcoidosis.

journal_name

Clin Exp Immunol

journal_title

Clinical and experimental immunology

authors

Idali F,Wahlström J,Müller-Suur C,Eklund A,Grunewald J

doi

10.1111/j.1365-2249.2008.03609.x

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

127-37

issue

1

eissn

0009-9104

issn

1365-2249

pii

CEI3609

journal_volume

152

pub_type

杂志文章

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