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The Journal of Immunology, Vol 150, Issue 8 3109-3118, Copyright © 1993 by American Association of Immunologists
ARTICLES |
SS Ahuja, F Paliogianni, H Yamada, JE Balow and DT Boumpas
Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.
Transforming growth factors-beta (TGF-beta) modulate immune responses by inhibiting the proliferation of normal T lymphocytes. To examine the mechanism(s) of this inhibition, we studied the effect of TGF-beta 1 on selected events associated with the initiation and progression of the T lymphocyte cell cycle. Human peripheral blood T cells were stimulated with anti-CD3 mAb, PHA, PMA, or ionomycin, alone or in combination. TGF- beta 1 (0.5 to 10 ng/ml) partially inhibited the tyrosine phosphorylation of a 100-kDa protein, but not the calcium influx when cells were stimulated via TCR. Nuclear transcription of early activation genes (c-fos, c-jun, and c-myc) as determined by nuclear run- off assays, and steady state mRNA levels and/or protein products of intermediate activation genes (IL-2, IL-2R alpha, IL-2R beta, and transferrin receptor) were not affected by TGF-beta 1. Total cellular RNA synthesis and cell size after T cell stimulation were also not affected by TGF-beta 1. However, TGF-beta 1 inhibited the IL-2- dependent proliferation of Con A lymphoblasts by -50%. This inhibition was associated with the down-regulation of IL-2-mediated tyrosine phosphorylation of proteins of 120, 100, 85, 75, and 50 kDa. TGF-beta 1 also inhibited the IL-2-dependent phosphorylation of the retinoblastoma susceptibility gene product, which plays an important role in cell cycle progression. These results suggest that TGF-beta 1 inhibits T cell proliferation by down-regulating predominantly IL-2-mediated proliferative signals.
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