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XB130, a novel adaptor protein, promotes thyroid tumor growth

Atsushi Shiozaki1, Monika Lodyga, Xiao-Hui Bai

  • 1Latner Thoracic Surgery Research Laboratories, University Health Network, Toronto General Research Institute, Toronto, Ontario, Canada.

The American Journal of Pathology
|January 13, 2011
PubMed

Insights

The novel adaptor protein XB130 promotes thyroid cancer growth by influencing cell proliferation and survival. Inhibiting XB130 reduces tumor growth and induces apoptosis, suggesting it

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Adaptor proteins regulate cellular functions through multimodular structures.
  • XB130 is a novel adaptor protein interacting with phosphatidylinositol 3-kinase (PI3K) p85α subunit.
  • XB130 mediates signaling through RET/PTC in thyroid cancer cells.

Purpose of the Study:

  • To investigate the role of XB130 in thyroid tumorigenesis in vivo.
  • To elucidate the molecular mechanisms underlying XB130's function in cancer.
  • To determine the expression patterns of XB130 in normal and cancerous thyroid tissues.

Main Methods:

  • Small interfering RNA (siRNA) and short hairpin RNA (shRNA) were used to knockdown XB130 expression in WRO thyroid cancer cells.
  • Tumorigenesis was assessed in nude mice xenograft models using XB130-silenced WRO cells.
  • Microarray analysis and Ingenuity Pathway Analysis (IPA) were employed to identify gene expression changes and affected pathways.
  • Human thyroid tissue microarrays were used to evaluate XB130 expression in various thyroid conditions.

Main Results:

  • XB130 knockdown in WRO cells inhibited cell cycle progression (G1-S phase) and induced apoptosis.
  • Tumor growth in nude mice was significantly reduced in XB130-silenced WRO cell xenografts, correlating with decreased proliferation and increased apoptosis.
  • Microarray analysis revealed significant alterations in 246 genes upon XB130 knockdown, with 57 genes impacting cell proliferation or survival, including transcription regulators.
  • IPA identified cancer as the top disease-related pathway and cellular growth/proliferation/cell cycle as top molecular functions associated with XB130.
  • XB130 was expressed in both normal thyroid tissue and human thyroid carcinomas.

Conclusions:

  • XB130 plays a significant role in promoting thyroid cancer cell proliferation and survival.
  • XB130 influences tumorigenesis by regulating the expression of multiple genes, particularly transcription regulators.
  • Targeting XB130 may represent a potential therapeutic strategy for thyroid cancer.

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