Regulation of the nuclear factor of activated T cells in stably transfected Jurkat cell clones

Wei Li, Robert E. Handschumacher

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Two Jurkat cell clones have been stably transfected with a reporter vector for the nuclear factor of activated T cells (NFAT). Upon stimulation, they express high levels of secreted heat stable placental alkaline phosphatase. With these clones, we demonstrated that NFAT activation induced by phorbol 12-myristate 13-acetate and ionomycin was inhibited by both cyclosporin A (CsA) (IC50 = 8 nM) and FK506 (IC50 = 160 pM), presumably by inhibition of calcineurin activity. Selective phosphatase inhibitors for protein phosphatase 1 (PP1) and 2A (PP2A) that do not inhibit calcineurin, such as okadaic acid and calyculin A, also inhibited NFAT activation with IC50s of 87 nM and 4 nM, respectively, suggesting that okadaic acid and related inhibitors may block NFAT activation through the inhibition of PP1, instead of PP2A. NFAT activation was also inhibited by agents that increase cAMP concentrations such as dibutyryl cAMP, forskolin and prostaglandin E2. These stable Jurkat cell clones provide a convenient and sensitive tool to study NFAT regulation.

Original languageEnglish (US)
Pages (from-to)96-99
Number of pages4
JournalBiochemical and biophysical research communications
Issue number1
StatePublished - Feb 6 1996
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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