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Epidermal growth factor receptor expression in a retinoic acid-treated human melanoma cell line
Y Yongshan1, D M DeBauche, W S Stanley
1Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston 29425.
Abstract:
Treatment of a human cell line (HXG-2), established from a metastatic melanoma, with retinoic acid (RA) induced morphologic differentiation and eliminated its cloning capacity in soft agar. With the v-erb B oncogene as a probe, slot blot hybridization of genomic DNA from parental HXG-2 cells did not show epidermal growth factor (EGF) receptor gene amplification as compared with normal diploid fibroblasts. Analysis of RNA as well as EGF receptor determinations from HXG-2 and RA-treated HXG-2 cells showed essentially no differences, indicating that RA treatment does not modulate EGF receptor gene expression. Although enhanced EGF receptor expression is found in some advanced-stage melanomas, RA-induced changes in the transformation phenotype of cell line HXG-2 probably do not result from modulation of the EGF-mediated pathway.
Insights
Retinoic acid (RA) induced differentiation and reduced cloning capacity in metastatic melanoma cells (HXG-2). However, RA treatment did not alter epidermal growth factor (EGF) receptor gene expression or amplification, suggesting the EGF pathway is not involved.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Metastatic melanoma is an aggressive skin cancer.
- Retinoic acid (RA) is a derivative of Vitamin A known to influence cell differentiation.
- Epidermal Growth Factor (EGF) receptor signaling is implicated in some cancers, including melanoma.
Purpose of the Study:
- To investigate the effects of retinoic acid (RA) on the metastatic melanoma cell line HXG-2.
- To determine if RA-induced changes in HXG-2 cells involve the epidermal growth factor (EGF) receptor pathway.
Main Methods:
- Treatment of HXG-2 cells with retinoic acid (RA).
- Assay of cloning capacity in soft agar.
- Slot blot hybridization to detect EGF receptor gene amplification.
- RNA analysis and EGF receptor expression determination.
Main Results:
- RA treatment induced morphologic differentiation and abolished soft agar cloning capacity in HXG-2 cells.
- No evidence of EGF receptor gene amplification was found in HXG-2 cells compared to normal fibroblasts.
- RA treatment did not significantly alter EGF receptor gene expression or protein levels.
Conclusions:
- RA induces differentiation and reduces the transformation potential of HXG-2 melanoma cells.
- The observed effects of RA are likely independent of the epidermal growth factor (EGF) receptor pathway.
- RA may offer a therapeutic strategy for melanoma by targeting pathways other than EGF receptor signaling.