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Tacrolimus-induced apoptotic signal transduction pathway

S J N Choi1, H S You, S Y Chung

  • 1Division of Transplantation Surgery, Department of Surgery, Chonnam National University Medical School, Gwangju, Korea. choisjn@chonnam.ac.kr

Transplantation Proceedings
|October 22, 2008
PubMed

Insights

Tacrolimus (FK506) induces apoptosis and cell cycle arrest in Jurkat T lymphocytes. This immunosuppressant triggers cell death via caspase-3 activation and reactive oxygen species generation, impacting Bak protein and mitochondria.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Tacrolimus (FK506) is a widely used immunosuppressant.
  • Understanding its effects on T lymphocyte signaling pathways is crucial.

Purpose of the Study:

  • To investigate the impact of FK506 on apoptotic signaling pathways in Jurkat human T lymphocytes.
  • To analyze FK506's effects on cell viability, apoptosis, protein expression, and reactive oxygen species (ROS) generation.

Main Methods:

  • Jurkat cells were treated with FK506.
  • Flow cytometry was used to assess cell viability and cell cycle.
  • Western blotting analyzed protein expression (Bcl-2, Bak, Fas, Fas-L, CDK4, cyclin D1).
  • Caspase activity, ROS generation, and mitochondrial membrane potential were measured.

Main Results:

  • FK506 decreased Jurkat cell viability in a dose- and time-dependent manner.
  • FK506 induced G0/G1 cell cycle arrest and apoptosis, marked by nuclear fragmentation and caspase-3 activation.
  • Increased Bak, CDK4, and cyclin D1 expression were observed, while Bcl-2, Fas, and Fas-L remained unchanged.
  • FK506-induced cytotoxicity involved ROS generation, modulating Bak expression and mitochondrial dysfunction.

Conclusions:

  • FK506 induces apoptosis and G0/G1 cell cycle arrest in Jurkat T lymphocytes.
  • Caspase-3 activation, ROS generation, Bak modulation, and mitochondrial dysfunction are key mechanisms in FK506-induced cell death.

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