SATB1-dependent mitochondrial ROS production controls TCR signaling in CD4 T cells

Taku Kuwabara, Fumio Ishikawa, Masataka Ikeda, Tomomi Ide, Terumi Kohwi-Shigematsu, Yuriko Tanaka, Motonari Kondo

Research output: Contribution to journalArticlepeer-review

Abstract

Special AT-rich sequence binding protein-1 (SATB1) is localized to the nucleus and remodels chromatin structure in T cells. SATB1- deficient CD4 T cells cannot respond to TCR stimulation; however, the cause of this unresponsiveness is to be clarified. Here, we demonstrate that SATB1 is indispensable to proper mitochondrial functioning and necessary for the activation of signal cascades via the TCR in CD4 T cells. Naïve SATB1-deficient CD4 T cells contain fewer mitochondria than WT T cells, as the former do not express mitochondrial transcription factor A (TFAM). Impaired mitochondrial function in SATB1-deficient T cells subvertsmitochondrial ROS production and SHP-1 inactivation by constitutive oxidization. Ectopic TFAM expression increases mitochondrial mass and mitochondrial ROS production and rescues defects in the antigenspecific response in the SATB1-deficient T cells. Thus, SATB1 is vital for maintaining mitochondrial mass and function by regulating TFAM expression, which is necessary for TCR signaling.

Original languageEnglish
Article numbere202101093
JournalLife Science Alliance
Volume4
Issue number11
DOIs
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Ecology
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Plant Science
  • Health, Toxicology and Mutagenesis

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