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TIS21(/BTG2/PC3) inhibits interleukin-6 expression via downregulation of STAT3 pathway

Linh Nguyen Quy1, Yong Won Choi, Yeong Hwa Kim

  • 1Department of Biochemistry and Molecular Biology, Ajou University, School of Medicine, Suwon 443-721, Republic of Korea.

Cellular Signalling
|August 7, 2013
PubMed

Insights

The study investigated TIS21's role in the cancer microenvironment. TIS21 inhibits cancer cell growth by decreasing interleukin-6 (IL-6) expression and downregulating STAT3 activation.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Fibroblasts influence cancer cell growth within the tumor microenvironment.
  • The specific role of TIS21 in modulating fibroblast-cancer cell interactions requires elucidation.

Purpose of the Study:

  • To investigate the function of TIS21 in the cancer microenvironment.
  • To determine the molecular mechanisms by which TIS21 affects cancer cell proliferation and associated signaling pathways.

Main Methods:

  • Co-culture experiments of cancer cells with normal and TIS21-overexpressed fibroblasts.
  • Adenoviral transduction and gene knockdown techniques to manipulate TIS21 expression in human dermal fibroblasts (HDF).
  • Analysis of interleukin-6 (IL-6) expression, STAT3 signaling pathway activation, and reactive oxygen species (ROS) generation.

Main Results:

  • TIS21 overexpression in HDF decreased IL-6 expression and secretion, while TIS21 knockdown increased IL-6 levels.
  • TIS21 inhibited STAT3 binding to the IL-6 promoter and downregulated JAK2-STAT3 signaling by reducing mitochondrial ROS generation.
  • Mitochondria-targeted TIS21 (MT-TIS21) also suppressed IL-6 expression and STAT3 phosphorylation, without affecting the NF-κB pathway.

Conclusions:

  • TIS21 acts as a negative regulator of cancer cell growth.
  • TIS21 inhibits cancer cell proliferation by suppressing IL-6 expression and downregulating STAT3 activation via mitochondrial pathways.
Keywords:
Interleukin-6JAK2ROSSTAT3TIS21(/BTG2/PC3)

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