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Induction of Invasive Transitional Cell Bladder Carcinoma in Immune Intact Human MUC1 Transgenic Mice: A Model for Immunotherapy Development
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Attenuated expression of xeroderma pigmentosum group C is associated with critical events in human bladder cancer

Zhiwen Chen1, Jin Yang, Gan Wang

  • 1Urology Institute of People's Liberation Army, Southwest Hospital, The Third Military Medical University, Chongqing, P.R. China. zhiwen@mail.tmmu.com.cn

Cancer Research
|May 19, 2007
PubMed

Insights

Xeroderma pigmentosum group C (XPC) protein deficiency correlates with bladder cancer progression and drug resistance. Restoring XPC levels in cancer cells enhances DNA repair and chemotherapy-induced apoptosis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Xeroderma pigmentosum group C (XPC) is a key DNA damage recognition protein involved in DNA repair, cell cycle checkpoints, and apoptosis.
  • XPC defects are linked to various solid tumors, but its precise role in cancer progression remains largely unknown.

Purpose of the Study:

  • To investigate the correlation between XPC protein expression and bladder cancer progression.
  • To elucidate the role of XPC in DNA repair, drug resistance, and apoptosis in bladder cancer cells.

Main Methods:

  • Immunohistochemical analysis of XPC expression in bladder cancer tissues.
  • Assessment of DNA repair capacity and cisplatin resistance in HT1197 bladder cancer cells with varying XPC levels.
  • Stable transfection of XPC cDNA into HT1197 cells to restore XPC expression.

Main Results:

  • A strong correlation was observed between attenuated XPC protein expression and bladder cancer progression.
  • XPC deficiency was associated with p53 mutations and higher tumor malignancy.
  • HT1197 cells with low XPC showed reduced DNA repair and cisplatin resistance, which was reversed upon XPC restoration.
  • Restored XPC expression increased cisplatin-induced apoptosis and p53/p73 responses.

Conclusions:

  • XPC deficiency is a significant factor in bladder tumor progression and contributes to drug resistance in bladder cancer cells.
  • XPC plays a crucial role in maintaining DNA repair efficiency and chemosensitivity in bladder cancer.

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