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UV light blocks EGFR signalling in human cancer cell lines
B B Olsen1, M T Neves-Petersen, S Klitgaard
1Institute for Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark.
Abstract:
UV light excites aromatic residues, causing these to disrupt nearby disulphide bridges. The EGF receptor is rich in aromatic residues near the disulphide bridges. Herein we show that laser-pulsed UV illumination of two different skin-derived cancer cell lines i.e. Cal-39 and A431, which both overexpress the EGF receptor, leads to arrest of the EGFR signaling pathway. The phosphorylation status of the receptor and the level of phosphorylated downstream signaling molecules i.e. AKT and the mitogen activated protein kinases (MAPKs) ERK1 and 2 is detected by Western blotting using phosphospecific antibodies. There was a threshold level, below which the receptor could not be blocked. In addition, illumination caused the cells to upregulate the cyclin-dependent kinase inhibitor p21WAF1, irrespective of the p53 status. Since the EGF receptor is often overexpressed in cancers and other proliferative skin disorders, it might be possible to significantly reduce the proliferative potential of these cells making them good targets for laser-pulsed UV light treatment.
Insights
Laser-pulsed UV light treatment effectively blocks the Epidermal Growth Factor Receptor (EGFR) signaling pathway in skin cancer cells. This targeted approach shows potential for reducing cancer cell proliferation.
Area of Science:
- Biochemistry
- Dermatology
- Oncology
Background:
- Epidermal Growth Factor Receptor (EGFR) is frequently overexpressed in various cancers, driving cell proliferation.
- Aromatic residues near disulfide bridges in EGFR are susceptible to disruption by UV light.
- Disruption of EGFR signaling is a key strategy in cancer therapy.
Purpose of the Study:
- To investigate the effect of laser-pulsed UV illumination on EGFR signaling in skin cancer cells.
- To determine if UV light can inhibit the overexpressed EGFR pathway in cancer.
- To explore the potential of UV light as a therapeutic modality for EGFR-driven proliferative disorders.
Main Methods:
- Utilized two human skin cancer cell lines (Cal-39 and A431) overexpressing EGFR.
- Applied laser-pulsed UV illumination to the cell lines.
- Assessed EGFR pathway activity by Western blotting, detecting phosphorylation of EGFR, AKT, and MAPK (ERK1/2).
- Monitored the expression of cyclin-dependent kinase inhibitor p21WAF1.
Main Results:
- Laser-pulsed UV illumination effectively arrested the EGFR signaling pathway in both cell lines.
- A minimum threshold of UV exposure was required to block EGFR.
- UV treatment led to increased expression of p21WAF1, a cell cycle inhibitor, regardless of p53 status.
- Downstream signaling molecules AKT and ERK1/2 phosphorylation levels were reduced.
Conclusions:
- Laser-pulsed UV light is a viable method for inhibiting the EGFR signaling pathway in cancer cells.
- This UV-based approach can reduce the proliferative potential of cancer cells with EGFR overexpression.
- UV light treatment presents a promising therapeutic strategy for EGFR-driven skin cancers and proliferative disorders.
