Characterization of the interstitial lung and peripheral blood T cell receptor repertoire in cigarette smokers.

T lymphocytes modulate the pulmonary inflammatory response. The aim of this study was to evaluate the clonality within the interstitial lung and peripheral blood T cell receptor (TCR) repertoire in smokers. Interstitial T lymphocytes were isolated from surplus tissue of 16 patients (63 +/- 9 [+/- SD] yr old, 11 male) undergoing surgery due to lung cancer (n = 15) or emphysema. TCR clonality was assessed by PCR amplification followed by spectratyping. Nearly all TCR of interstitial lung lymphocytes showed oligoclonal bands (CD4(+) subset 13/16 patients, 81%; CD8(+) 100%) indicating a specific differentiation. Peripheral blood T lymphocytes (PBL) TCR (especially CD4(+)) had less oligoclonal bands (CD4(+) 31%, CD8(+) 88%). Likewise, more oligoclonal bands were seen in lung TCR (total of 168 bands; 37 CD4(+); 131 CD8(+)), compared with 59 bands in PBL TCR (13 CD4(+); 46 CD8(+)). Intraindividual comparison revealed a more prominent difference in TCR oligoclonality between lung and blood in CD8(+) T cells (median of difference lung minus blood 5; interquartile range 1-10; P = 0.002) compared with CD4(+) T cells (median 2, 0-3, P = 0.039). Thus, TCR oligoclonality is preferentially found in the CD8(+) T cell subset, most distinctive in the lung. These findings indicate a specific interstitial T cell differentiation in response to local stimuli.

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