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Updated: Jun 6, 2025

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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TMBIM6/BI-1 is an intracellular environmental regulator that induces paraptosis in cancer via ROS and

Keith S Robinson1, Peter Sennhenn2, Daniel S Yuan2

  • 1MicroQuin, Cambridge, MA, USA. scott.robinson@microquin.com.

Oncogene
|November 28, 2024
PubMed

Insights

Transmembrane B cell lymphoma 2-associated X protein inhibitor motif-containing 6 (TMBIM6) protein

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Transmembrane B cell lymphoma 2-associated X protein inhibitor motif-containing 6 (TMBIM6), also known as Bax Inhibitor-1 (BI-1), is a key regulator of cellular homeostasis.
  • TMBIM6 plays a critical role in cytoprotection, modulating cell survival, stress responses, metabolism, and organelle function.
  • Dysregulation of TMBIM6 is implicated in numerous diseases, including neurodegenerative disorders, metabolic diseases, and various cancers.

Purpose of the Study:

  • To investigate the conformational changes and functional diversity of TMBIM6 in response to alterations in the intracellular environment (ICE).
  • To elucidate the mechanism by which TMBIM6 agonism induces cell death in cancer cells.
  • To evaluate the therapeutic potential of TMBIM6 agonism in preclinical cancer models.

Main Methods:

  • Analysis of TMBIM6 conformational changes induced by intracellular environment shifts.
  • Investigating the signaling pathways and cellular processes activated by TMBIM6 agonism in cancer cells.
  • Evaluating the efficacy and toxicity of TMBIM6 agonists in cancer xenograft models.

Main Results:

  • TMBIM6 undergoes conformational changes that dictate its function following significant intracellular environment shifts.
  • TMBIM6 agonism in cancer cells rapidly induces paraptosis through ERAD II mechanisms, independent of canonical cell death pathways.
  • TMBIM6 agonism demonstrates potent anti-cancer activity in xenograft models with no observed toxicity, even at high doses.

Conclusions:

  • TMBIM6's diverse functions are activated by severe intracellular environment changes, particularly in diseased or injured cells.
  • TMBIM6 agonism represents a novel therapeutic strategy for inducing cancer cell death via paraptosis.
  • TMBIM6 holds transformative potential as a therapeutic target for a wide range of diseases and injuries, including cancer.

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