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FTY720 mediates activation suppression and G(0)/G (1) cell cycle arrest in a concanavalin A-induced mouse

Xiangfeng Zeng1, Tong Wang, Cairong Zhu

  • 1Institute for Tissue Transplantation and Immunology, Jinan University, Guangzhou, Guangdong, 510632, China.

Inflammation Research : Official Journal of the European Histamine Research Society ... [Et Al.]
|March 13, 2012
PubMed
Abstract

Insights

FTY720 drug halts lymphocyte activation and proliferation by inducing cell cycle arrest. This mechanism, potentially linked to reduced intracellular calcium, suggests broader anti-inflammatory applications beyond multiple sclerosis.

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • FTY720 is an established treatment for multiple sclerosis.
  • Aberrant inflammation underlies various diseases, prompting investigation into broader therapeutic applications of FTY720.

Purpose of the Study:

  • To investigate FTY720's potential as a lymphocyte cell cycle blocker and activation suppressor.
  • To explore FTY720's mechanism of action in a concanavalin A (ConA)-induced mouse lymphocyte pan-activation model.

Main Methods:

  • Mouse lymphocytes were isolated and treated with ConA and/or FTY720.
  • Cell viability, activation markers (CD69, CD25), proliferation, cell cycle, and intracellular calcium ([Ca(2+)](i)) were analyzed using flow cytometry and MTT assays.

Main Results:

  • FTY720 ( < 500 nM) suppressed T cell activation markers and lymphocyte proliferation.
  • FTY720 induced G(0)/G(1) phase cell cycle arrest, reducing cells in S and G(2)/M phases.
  • A significant decrease in intracellular calcium ([Ca(2+)](i)) was observed, correlating with cell cycle arrest.

Conclusions:

  • FTY720 effectively inhibits lymphocyte proliferation by inducing G(0)/G(1) cell cycle arrest.
  • The observed anti-proliferative effect may be mediated by a reduction in intracellular calcium levels.

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