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To identify differentially expressed genes from channel catfish macrophages, a cDNA library from LPS-stimulated catfish macrophages was screened by subtractive hybridization. This screening yielded a 552-bp cDNA coding for catfish thioredoxin (CF-TRX). The deduced amino acid sequence revealed that CF-TRX contains 107 amino acids and is 59% homologous to human adult T cell leukemia-derived factor/TRX, originally described as an IL-2R alpha-inducing factor. Northern blot analyses showed that CF-TRX is expressed in catfish T and macrophage cell lines, but weakly in B cell lines. Similar results were also observed in Western blot analyses using a mAb specific for recombinant CF-TRX (rTRX). The use of rTRX in functional studies demonstrated that rTRX induces in vitro proliferative responses of catfish PBL that were synergistically enhanced by the addition of culture supernatants from catfish T cell lines. In addition, cell separation studies and flow cytometric analyses revealed that the cells proliferating in rTRX-stimulated cultures were mostly B cells. These results suggest that CF-TRX may have an important role in the activation and proliferation of channel catfish B cells.

Thioredoxin Acts as a B Cell Growth Factor in Channel Catfish