Thymic Stromal Lymphopoietin Expression Is Increased in Asthmatic Airways and Correlates with Expression of Th2-Attracting Chemokines and Disease Severity

Journal of Immunology - Tập 174 Số 12 - Trang 8183-8190 - 2005
Sun Ying1, Brian O’Connor1, Jonathan Ratoff1, Qiu Meng1, K. Mallett1, David J. Cousins1, Douglas S. Robinson2, Guizhen Zhang3, Jisheng Zhao3, TH Lee1, Christopher J. Corrigan1
1*Department of Asthma, Allergy and Respiratory Science, Guy’s, King’s and St. Thomas’ (GKT) School of Medicine and
2† Department of Allergy, National Heart and Lung Institute, and Leukocyte Biology Section, Biomedical Sciences Division, Imperial College School of Medicine, London, United Kingdom; and
3‡ Department of Central Research, Third Clinical College, Jilin University, Changchun, People’s Republic of China

Tóm tắt

AbstractThymic stromal lymphopoietin (TSLP) is said to increase expression of chemokines attracting Th2 T cells. We hypothesized that asthma is characterized by elevated bronchial mucosal expression of TSLP and Th2-attracting, but not Th1-attracting, chemokines as compared with controls, with selective accumulation of cells bearing receptors for these chemokines. We used in situ hybridization and immunohistochemistry to examine the expression and cellular provenance of TSLP, Th2-attracting (thymus and activation-regulated chemokine (TARC)/CCL17, macrophage-derived chemokine (MDC)/CCL22, I-309/CCL1) and Th1-attracting (IFN-γ-inducible protein 10 (IP-10)/CXCL10, IFN-inducible T cell α-chemoattractant (I-TAC)/CXCL11) chemokines and expression of their receptors CCR4, CCR8, and CXCR3 in bronchial biopsies from 20 asthmatics and 15 normal controls. The numbers of cells within the bronchial epithelium and submucosa expressing mRNA for TSLP, TARC/CCL17, MDC/CCL22, and IP-10/CXCL10, but not I-TAC/CXCL11 and I-309/CCL1, were significantly increased in asthmatics as compared with controls (p ≤ 0.018). TSLP and TARC/CCL17 expression correlated with airway obstruction. Although the total numbers of cells expressing CCR4, CCR8, and CXCR3 did not significantly differ in the asthmatics and controls, there was evidence of selective infiltration of CD4+/CCR4+ T cells in the asthmatic biopsies which correlated with TARC and MDC expression and airway obstruction. Epithelial cells, endothelial cells, neutrophils, macrophages, and mast cells were significant sources of TSLP and chemokines. Our data implicate TSLP, TARC/CCL17, MDC/CCL22, and IP-10/CXCL10 in asthma pathogenesis. These may act partly through selective development and retention, or recruitment of Th2 cells bearing their receptors.

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Journal of Immunology

Tập 174 Số 12

8183-8190

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