Induction of BAG2 protein during proteasome inhibitor-induced apoptosis in thyroid carcinoma cells

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H-Q Wang1, H-Y Zhang, F-J Hao

  • 1Department of Biochemistry & Molecular Biology, China Medical University, Shenyang, China.

British Journal of Pharmacology
|July 29, 2008
PubMed
Abstract

Insights

Proteasome inhibitors increase BAG2 expression, a protein that promotes apoptosis in thyroid cancer cells. Silencing BAG2 reduces cell death caused by proteasome inhibitors, revealing its role in cancer therapy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Death Pathways

Background:

  • Proteasome inhibitors are cytotoxic to various tumors.
  • Mechanisms of apoptosis induction by proteasome inhibitors are complex and not fully understood.
  • Bcl-2-associated athanogene (BAG) family proteins interact with apoptosis regulators, but their role in proteasome inhibition is unknown.

Purpose of the Study:

  • To investigate the role of BAG family proteins in proteasome inhibitor-induced apoptosis.
  • To determine if proteasome inhibitors affect BAG2 expression.
  • To elucidate the function of BAG2 in the context of proteasome inhibition.

Main Methods:

  • Real-time reverse transcription-polymerase chain reaction (RT-PCR) to assess BAG2 mRNA levels.
  • Small interfering RNA (siRNA) to knock down BAG2 expression.
  • Annexin V/propidium iodide staining followed by Fluorescence-Activated Cell Sorting (FACS) to quantify apoptosis.

Main Results:

  • Proteasome inhibitors (MG132, PSI, lactacystin, epoxomicin) upregulated BAG2 transcription.
  • Knockdown of BAG2 using RNA interference significantly suppressed MG132-induced apoptosis.
  • BAG2 expression is induced by proteasome inhibitors.

Conclusions:

  • BAG2 is a novel molecule induced by proteasome inhibition.
  • BAG2 exhibits pro-apoptotic properties in thyroid cancer cells treated with proteasome inhibitors.
  • BAG2 plays a significant role in mediating apoptosis induced by proteasome inhibitors.

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