Annals of Surgical Oncology

, Volume 14, Issue 4, pp 1416–1423

Down-Regulation of Pro-Apoptotic Genes is an Early Event in the Progression of Malignant Melanoma

Authors

  • Eric H. Jensen
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
    • Department of SurgeryDivision of Surgical Oncology
  • James M. Lewis
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • James M. McLoughlin
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Michael D. Alvarado
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Adil Daud
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Jane Messina
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Steven Enkemann
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Timothy J. Yeatman
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
  • Vernon K. Sondak
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
    • Department of Interdisciplinary Oncology, Cutaneous Oncology ProgramH. Lee Moffitt Cancer Center and Research Institute
    • University of South AlabamaMitchell Cancer Institute
Article

DOI: 10.1245/s10434-006-9226-2

Cite this article as:
Jensen, E.H., Lewis, J.M., McLoughlin, J.M. et al. Ann Surg Oncol (2007) 14: 1416. doi:10.1245/s10434-006-9226-2

Abstract

Introduction

Down-regulation of apoptosis genes has been implicated in the development and progression of malignant melanoma. We used cDNA microarray to evaluate pro-apoptotic gene expression comparing normal skin to melanoma (thin and thick), nodal disease and distant metastases.

Methods

Twenty-eight specimens including skin (= 1), thin melanoma (= 6), thick melanoma (= 7), nodal disease (= 6), and distant metastases (= 8), were harvested at the time of resection from 16 individuals. RNA was isolated and microarray analysis utilizing the Affymetrix GeneChip (54,000 genetic elements, U133A+B... levels) was performed. Mean level of expression was calculated for each gene within a sample group. Expression profiles were then compared between tissue groups. Student’s t-test was used to determine variance in expression between groups.

Results

We reviewed the expression of 54,000 genetic elements, of which 2,015 were found to have significantly altered expression. This represents 1,602 genes. Twenty-two pro-apoptotic genes were found to be down-regulated when compared to normal skin. Overall reduction was evaluated comparing normal skin to metastases with a range of 3.31–64.04-fold-decrease. When comparing the tissue types sequentially, the greatest fold-decrease in gene expression occurred when comparing skin to all melanomas (thin and thick) (= 0.011). Subset analysis comparing normal skin to thin melanoma or thick melanoma, revealed the greatest component of overall reduction at the transition from thin to thick lesions (= 0.003).

Conclusion

Sequential down-regulation of pro-apoptotic genes is associated with the progression of malignant melanoma. The greatest fold-decrease occurs in the transformation from thin to thick lesions.

Keywords

ApoptosisMelanomaMetastasisGene profilingMicroarray

Copyright information

© Society of Surgical Oncology 2006