The Jak inhibitor CP-690,550 preserves the function of CD4 +CD25brightFoxP3+ regulatory T cells and inhibits effector T cells

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Abstract

The Jak inhibitor CP-690,550 inhibits alloreactivity and is currently being investigated for prevention of allograft rejection after transplantation. In this study, we examined the effect of CP-690,550 on IL-2-mediated Jak/STAT5 phosphorylation by CD4+CD25brightFoxP3 +CD127-/low T cells (Treg) and CD4+CD25 neg effector T cells (Teff) in kidney transplant (KTx) patients. Phosphospecific flow cytometry was used to study the effect of CP-690,550 on IL-2-induced intracellular STAT5-phosphorylation. IL-2-induced phosphorylation of STAT5 (P-STAT5) in both Treg and Teff, which was significantly higher for CD4+CD25bright Treg (increased by 71%, mean) than for CD4+CD25neg Teff (increased by 42%). In the presence of 100 ng/mL CP-690,550, a clinically relevant exposure, IL-2-induced P-STAT5 was partially inhibited in CD4+CD25brightTreg (% inhibition; 51%), while almost completely blocked in Teff (%inhibition; 84%, p = 0.03). The IC50 was 2-3 times higher for Treg (104 ng/mL) than for Teff (40 ng/mL, p = 0.02). In the presence of CP-690,550, Treg exhibited additional suppressive activities on the alloactivated proliferation of Teff (56%, mean). In addition, CD4+CD25bright Treg from KTx-patients receiving CP-690,550 vigorously suppressed the proliferation of Teff (87%, mean). Our findings show that CP-690,550 effectively inhibits Teff function but preserves the suppressive activity of CD4+CD25bright regulatory T cells. © 2010 The American Society of Transplantation and the American Society of Transplant Surgeons.

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Sewgobind, V. D. K. D., Quaedackers, M. E., Van Der Laan, L. J. W., Kraaijeveld, R., Korevaar, S. S., Chan, G., … Baan, C. C. (2010). The Jak inhibitor CP-690,550 preserves the function of CD4 +CD25brightFoxP3+ regulatory T cells and inhibits effector T cells. American Journal of Transplantation, 10(8), 1785–1795. https://doi.org/10.1111/j.1600-6143.2010.03200.x

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