Published online before print July 19, 2007

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Copyright © 2007 American Society for Investigative Pathology
American Journal of Pathology, doi:10.2353/ajpath.2007.061177

Accepted for publication May 21, 2007.

Article

CC Chemokine Receptor 5 and CXC Chemokine Receptor 6 Expression by Lung CD8⁺ Cells Correlates with Chronic Obstructive Pulmonary Disease Severity

Christine M. Freeman^*, Jeffrey L. Curtis^*, and Stephen W. Chensue^*@

From the Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine,* and Department of Pathology, University of Michigan Health System, Ann Arbor; and Pulmonary and Critical Care Medicine Section and Pathology and Laboratory Medicine Service, VA Ann Arbor Healthcare System, Ann Arbor, Michigan

^@ To whom correspondence should be addressed. E-mail: schensue{at}med.umich.edu.

	Abstract

Chronic obstructive pulmonary disease (COPD) is a progressive disease associated with a cellular inflammatory response. CD8⁺ T cells are implicated in COPD pathogenesis, and their numbers significantly correlate with the degree of airflow limitation. Dendritic cells (DCs) are important sentinel immune cells, but little is known about their role in initiating and maintaining the CD8 T-cell response in COPD. To investigate the mechanisms for CD8⁺ T-cell recruitment to the lung, we used resected human lung tissue to analyze chemokine receptor expression by CD8⁺ T cells and chemokine production by CD1a⁺ DCs. Among 11 surveyed chemokine receptors, only CC chemokine receptor (CCR5), CXC chemokine receptor (CXCR) 3, and CXCR6 correlated with COPD severity as defined by criteria from the Global Initiative for Chronic Obstructive Lung Disease. The CD8⁺ T cells displayed a Tc1, CD45RA⁺ effector memory phenotype. CD1a⁺ DCs produced the respective ligands for CCR5 and CXCR3, CCL3 and CXCL9, and levels correlated with disease severity. CD1a⁺ DCs also constitutively expressed the CXCR6 ligand, CXCL16. In conclusion, we have identified major chemokine elements that potentially mediate CD8⁺ T-cell infiltration during COPD progression and demonstrated that CD1a⁺ mucosal-associated DCs may sustain CD8⁺ T-cell recruitment/retention. Chemokine targeting may prove to be a viable treatment approach.

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