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E-selectin binds to squamous cell carcinoma and keratinocyte cell lines
M H Allen1, M K Robinson, P E Stephens
1Dunhill Dermatology Laboratory, St. John's Institute of Dermatology, London, U.K.
The Journal of Investigative Dermatology
|April 1, 1996
Summary
E-selectin binding to sialyl Lewis X (SL-X) on keratinocytes may drive squamous cell carcinoma (SCC) metastasis. This study demonstrates SL-X/E-selectin pathway importance in SCC using cell line models.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- E-selectin is an endothelial adhesion molecule involved in tumor metastasis.
- Keratinocyte cell lines and squamous cell carcinomas (SCC) express sialyl Lewis X (SL-X), an E-selectin ligand.
Purpose of the Study:
- To investigate the functional role of keratinocyte E-selectin ligands in SCC metastasis.
- To utilize a soluble E-selectin chimera (pE-sel-Ig) to study these interactions.
Main Methods:
- Incubation of keratinocyte cell lines (A431, SVK14) and normal keratinocytes with pE-sel-Ig, quantified by flow cytometry.
- Overlaying frozen SCC sections with pE-sel-Ig and visualizing binding immunoenzymatically.
- Immunolabeling using antibodies (CSLEX-1, HECA-452) targeting E-selectin ligands, including SL-X.
Main Results:
- E-selectin bound strongly to SCC cell lines (A431, SVK14), correlating with CSLEX-1 staining.
- Normal keratinocytes and epidermis did not bind E-selectin or express CSLEX-1/HECA-452 antigens.
- CSLEX-1 antibody blocked pE-sel-Ig binding, confirming SL-X involvement in SCC.
Conclusions:
- Functional evidence supports the SL-X/E-selectin pathway's role in SCC metastasis.
- A431 and SVK14 cell lines serve as effective models for studying these metastatic mechanisms.