Cyclosporin a but not FK506 inhibits thyroid hormone-induced apoptosis in tadpole intestinal epithelium

Yuan Su, Yufang Shi, Yun Bo Shi

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Amphibian metamorphosis and mammalian T cell development represent two of the best known systems where developmental programmed cell death through apoptosis takes place. Two immunosuppressants, cyclosporin A (CsA) and FK506, have been demonstrated to inhibit activation-induced cell death in immature T cells and T cell hybridomas. In this study, we have established an in vitro system in which isolated primary tadpole intestinal epithelial cells undergo typical apoptosis upon treatment with thyroid hormone (T3), the causative agent of metamorphosis. It is surprising that this T3-induced apoptosis was found to be inhibited only by CsA but not by FK506, whereas both immunosuppressants block activation-induced apoptosis in T cells. Since T3 exerts its effect primarily by regulating gene transcription through direct binding to nuclear thyroid hormone receptors, our results strongly suggest that except for their similarity in the T cell receptor-mediated signal transduction process, CsA, but not FK506, also blocks another yet- unidentified step during the induction of apoptosis. The identification of this novel function of CsA may provide an important clue toward the understanding of the mechanism of apoptosis and helps in designing better clinical applications of the immunosuppressants.

Original languageEnglish (US)
Pages (from-to)559-565
Number of pages7
JournalFASEB Journal
Issue number7
StatePublished - Jun 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics


  • Cell death
  • Immunosuppressant
  • Metamorphosis


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