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Down-regulation of insulin-like growth factor binding protein-5 (IGFBP-5): novel marker for cervical carcinogenesis

Takashi Miyatake1, Yutaka Ueda, Ryuichi Nakashima

  • 1Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, 1-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

International Journal of Cancer
|February 10, 2007
PubMed

Insights

Insulin-like growth factor binding protein-5 (IGFBP-5) is significantly down-regulated in cervical squamous cell carcinomas (SCCs). This loss of IGFBP-5 protein occurs early in cervical carcinogenesis, even in preneoplastic lesions.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Cervical carcinogenesis involves complex genetic alterations.
  • Understanding gene expression changes is crucial for identifying biomarkers.

Purpose of the Study:

  • To investigate gene expression profiles in cervical squamous cell carcinomas (SCCs).
  • To identify specific genes involved in cervical carcinogenesis.
  • To evaluate the role of insulin-like growth factor binding protein-5 (IGFBP-5) in cervical cancer development.

Main Methods:

  • cDNA microarray analysis was performed on SCCs and adjacent normal epithelia.
  • Real-time RT-PCR was used to validate gene expression.
  • Immunohistochemistry was employed to assess IGFBP-5 protein levels in normal tissues, SCCs, and cervical intraepithelial neoplasia (CIN) lesions.

Main Results:

  • 32 genes showed consistently altered expression between SCCs and normal tissues.
  • Insulin-like growth factor binding protein-5 (IGFBP-5) mRNA was significantly under-expressed in SCCs (p < 0.001).
  • IGFBP-5 protein was lost or reduced in 65% of SCCs and showed weaker/negative staining in advanced CIN3 lesions compared to normal epithelia (p = 0.001).

Conclusions:

  • Down-regulation of IGFBP-5 correlates with cervical carcinogenesis.
  • IGFBP-5 loss is an early event in cervical cancer development, present in preneoplastic stages.
  • IGFBP-5 represents a potential biomarker for cervical carcinogenesis.

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