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Transcriptional regulation of KiSS-1 gene expression in metastatic melanoma by specificity protein-1 and its

D C Mitchell1, L J Stafford, D Li

  • 1Institute of Biosciences and Technology, and Department of Molecular and Cellular Medicine, Texas A&M University System Health Science Center, Houston, TX 77030, USA.

Oncogene
|September 12, 2006
PubMed

Insights

Loss of DRIP-130 protein, encoded by chromosome 6q16.3-q23, reduces KiSS-1 expression and promotes melanoma metastasis. Restoring DRIP-130 and Sp1 rescues KiSS-1 expression and inhibits cancer cell invasion.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Loss of the KiSS-1 metastasis suppressor gene correlates with cancer progression.
  • Chromosome 6q16.3-q23 is crucial for KiSS-1 expression and suppressing metastasis.
  • The precise mechanism of KiSS-1 loss during metastasis remains unclear.

Purpose of the Study:

  • To investigate the role of Sp1-coactivator protein DRIP-130 in KiSS-1 expression and melanoma metastasis.
  • To identify the regulatory elements of the KiSS-1 promoter involved in DRIP-130-mediated transactivation.

Main Methods:

  • Assessed DRIP-130's impact on KiSS-1 promoter activity in malignant melanoma cells.
  • Examined the effect of co-expressing Sp1 and DRIP-130 on KiSS-1 expression and cellular behavior.
  • Utilized targeted deletion of specific promoter regions to analyze transcriptional control.

Main Results:

  • Loss of DRIP-130 reduced KiSS-1 promoter activation in highly malignant melanoma cells.
  • Co-expression of Sp1 and DRIP-130 restored KiSS-1 expression and inhibited melanoma cell invasion and migration.
  • Deletion of a GC-rich region (-93 to -58) within the KiSS-1 promoter disrupted Sp1- and DRIP-130-mediated transcription.

Conclusions:

  • DRIP-130 is a key regulator of KiSS-1 transactivation in normal tissues.
  • Loss of DRIP-130 expression, due to chromosome 6q16.3-q23 loss, contributes to increased tumor metastasis.
  • Targeting the Sp1/DRIP-130 pathway may offer therapeutic strategies for melanoma metastasis.

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