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HLJ1 is an endogenous Src inhibitor suppressing cancer progression through dual mechanisms

C-H Chen1,2, W-H Chang3, K-Y Su4,5

  • 1Department of Internal Medicine and Center for Comparative Respiratory Biology and Medicine, University of California Davis, Davis, CA, USA.

Oncogene
|April 12, 2016
PubMed

Insights

Heat shock protein HLJ1 (DNAJB4) inhibits lung cancer metastasis by suppressing Src activity and oncogenic signaling pathways. This chaperone protein acts as an endogenous Src inhibitor, offering a new target for anticancer strategies.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Biology

Background:

  • Heat shock protein 1 (HLJ1/DNAJB4) is a novel prognostic marker in lung cancers.
  • The precise molecular functions of HLJ1 in neoplastic diseases are not fully understood.

Purpose of the Study:

  • To investigate the role of HLJ1 in inhibiting epithelial-mesenchymal transition and lung cancer metastasis.
  • To elucidate the molecular mechanisms by which HLJ1 exerts its anti-cancer effects, focusing on its interaction with Src.

Main Methods:

  • Utilized shRNA silencing and ectopic expression of HLJ1.
  • Investigated the impact of HLJ1 on Src catalytic activity and oncogenic signaling pathways (EGFR, FAK, STAT3).
  • Analyzed HLJ1-Src interactions in HLJ1-knockout mice and human lung cancer patient specimens.

Main Results:

  • HLJ1 significantly inhibits epithelial-mesenchymal transition in vitro and reduces lung cancer metastasis in vivo.
  • HLJ1 suppresses Src activity and downregulates oncogenic complex formation.
  • HLJ1 directly binds to Src, and this interaction is enhanced by Src-induced HLJ1 phosphorylation, leading to Src inhibition.

Conclusions:

  • HLJ1 functions as an endogenous Src inhibitor, suppressing cancer metastasis through complex mechanisms.
  • The HLJ1-Src interaction represents a promising molecular target for developing novel anticancer therapies.
  • Src-binding regions in HLJ1 are conserved in other DNAJB proteins, suggesting broader anti-invasive roles for this family.

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