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The Journal of Immunology, 1999, 163: 1019-1026.
Copyright © 1999 by The American Association of Immunologists

Identification of Pathogenic T Cells in Patients with Beryllium-Induced Lung Disease1

Andrew P. Fontenot*,{dagger},§, Michael T. Falta{dagger},¶, Brian M. Freed*,{dagger}, Lee S. Newman*,{ddagger},§ and Brian L. Kotzin2,*,{dagger},§,¶

Departments of * Medicine, {dagger} Immunology, and {ddagger} Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, CO 80262; and Departments of § Medicine and Pediatrics, National Jewish Medical and Research Center, Denver, CO 80206

Chronic beryllium disease (CBD) is caused by beryllium exposure and is characterized by granulomatous inflammation with accumulation of CD4+ T cells in the lung. We analyzed TCR ß-chain and {alpha}-chain genes expressed by these CD4+ T cells. In the lungs of individual patients, as well as among four of five CBD patients studied, different oligoclonal expansions within the Vß3 subset were found to express homologous or even identical CDR3 amino acid sequences. These related expansions were specific for CBD patients, were compartmentalized to lung, and persisted at high frequency in patients with active disease. Limiting dilution cloning and analysis of coexpressed TCR {alpha}-chain genes confirmed that these TCRs were selectively expanded by a common Ag involving beryllium. Overall, homologous TCR ß- and {alpha}-chains showed identical V regions and invariant charged residues within the CDR3 but considerable variability in TCRJ usage. Remarkably, CBD patients expressing nearly identical TCRs did not share common HLA-DRB1 or DQ alleles. These results implicate particular CD4+ cells in the pathogenesis of CBD and provide insight into how beryllium is recognized in human disease.




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