A Bellocq, D Lecossier, C Pierre-Audigier, A Tazi, D Valeyre and AJ Hance
INSERM U.82, Faculte de Medecine Xavier Bichat, Paris, France.

We evaluated the repertoire of V beta segments used in forming the T- cell receptor of lavage and blood T lymphocytes from 11 sarcoid patients and 10 normal subjects using procedures based on quantitative polymerase chain reaction, permitting analysis of both the abundance of transcripts using each of 20 different V beta families and the diversity of the VDJC beta rearrangements within each V beta family. Blood and lung T cells from sarcoid patients had a very diverse V beta repertoire. For all V beta families but one, the abundance of the V beta transcripts fell within the mean +/- 2 SD of that observed for normal blood lymphocytes; no difference in the overall abundance was observed comparing lavage and blood T cells, and the length of VDJC beta rearrangements for a given V beta family in samples from sarcoid patients was usually quite heterogeneous. Despite the overall polyclonality, evidence for selective expansion of T cells was found, in that an increased abundance of V beta 19 transcripts was observed for sarcoid blood and/or lung T cells in eight out of 11 patients studied, and rearrangements of a single predominant length using certain (e.g., V beta 19, V beta 14), but not all, V beta families were present. Sequencing confirmed the presence of a single predominant VDJC beta rearrangement in these cases. These findings suggest that the alveolitis in sarcoidosis results from two distinct processes, a local clonal expansion of T cells associated with an apparently nonspecific accumulation of T cells with an extremely diverse V beta repertoire.

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