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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
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TIFA suppresses hepatocellular carcinoma progression via MALT1-dependent and -independent signaling pathways

Wenzhi Shen1, Renle Du1, Jun Li1

  • 1Department of Immunology, School of Medicine, Nankai University, Tianjin, China.

Signal Transduction and Targeted Therapy
|December 22, 2017
PubMed

Insights

TIFA protein suppresses hepatocellular carcinoma (HCC) progression. Its mechanism involves distinct apoptosis patterns and signaling pathways, including MALT1, JNK, and p38, offering new therapeutic targets for HCC.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • TIFA (T2BP) was previously shown to suppress hepatocellular carcinoma (HCC) progression.
  • The precise molecular mechanisms underlying TIFA's tumor-suppressive functions remain largely unelucidated.

Purpose of the Study:

  • To elucidate the detailed molecular mechanisms by which TIFA suppresses HCC progression.
  • To investigate the distinct temporal patterns and signaling pathways involved in TIFA-mediated apoptosis and cell cycle arrest.

Main Methods:

  • Yeast two-hybrid screening for TIFA identification.
  • RNA interference (shRNA) for MALT1 silencing.
  • Overexpression studies for TIFA.
  • Western blotting and signaling pathway analysis (JNK, p38, TRAF6, p53-p21).
  • In vitro and in vivo experimental models.

Main Results:

  • TIFA-induced apoptosis exhibits two distinct time patterns (48 hours and >7 days).
  • MALT1 acts as a competitor to TIFA; MALT1 silencing enhances TIFA-induced apoptosis.
  • TIFA overexpression activates JNK (apoptosis) and p38 (cell cycle arrest via p53-p21) in a TRAF6-dependent manner.
  • Both MALT1-dependent and independent pathways mediate TIFA's tumor-suppressive effects.

Conclusions:

  • TIFA suppresses HCC progression through complex, time-dependent signaling pathways.
  • MALT1 plays a critical role in short-term TIFA activity, while TRAF6-mediated JNK/p38 activation is key for long-term effects.
  • Understanding these pathways reveals potential novel therapeutic targets for HCC treatment.

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