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NAC-1, a potential stem cell pluripotency factor, contributes to paclitaxel resistance in ovarian cancer through

N Jinawath1, C Vasoontara, K-L Yap

  • 1Departments of Pathology, Oncology, and Gynecology and Obstetrics, Johns Hopkins Medical Institutions, Baltimore, MD 21231, USA.

Oncogene
|March 24, 2009
PubMed

Insights

Nucleus accumbens-1 (NAC-1) promotes paclitaxel resistance in ovarian cancer by downregulating the Gadd45 pathway. NAC-1 upregulation and homodimerization contribute to chemoresistance and tumor recurrence.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Nucleus accumbens-1 (NAC-1) is a BTB/POZ transcription factor implicated in pluripotency.
  • NAC-1 is upregulated in various cancers, notably chemoresistant ovarian carcinomas.
  • Its role in ovarian cancer drug resistance warrants investigation.

Purpose of the Study:

  • To investigate the role of NAC-1 in paclitaxel resistance in ovarian cancer.
  • To elucidate the molecular mechanisms linking NAC-1 to chemoresistance.

Main Methods:

  • Correlation analysis of NAC-1 expression with paclitaxel resistance in ovarian cancer tissues and cell lines.
  • Assessment of Gadd45-gamma-interacting protein 1 (Gadd45gip1) expression.
  • Manipulation of NAC-1 and Gadd45gip1 levels via ectopic expression and knockdown.
  • Analysis of NAC-1 homodimerization and Gadd45gamma interaction.

Main Results:

  • NAC-1 expression positively correlates with paclitaxel resistance in ovarian serous carcinoma.
  • Paclitaxel-resistant cells exhibit reduced Gadd45gip1 expression.
  • Ectopic NAC-1 or Gadd45gip1 knockdown confers paclitaxel resistance.
  • NAC-1 silencing or disruption of homodimerization increases paclitaxel sensitivity.
  • NAC-1 negatively regulates the Gadd45 pathway, involving Gadd45gamma and Gadd45gip1.

Conclusions:

  • NAC-1 upregulation and homodimerization contribute to paclitaxel resistance in ovarian cancer.
  • The NAC-1/Gadd45 pathway is a key mechanism driving chemoresistance and tumor recurrence.
  • Targeting NAC-1 may represent a therapeutic strategy for overcoming paclitaxel resistance.

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