CD82/KAI expression prevents IL-8-mediated endothelial gap formation in late-stage melanomas
P Khanna1, C-Y Chung2, R I Neves3
1Department of Bioengineering, The Pennsylvania State University, University Park, PA, USA.
Oncogene
|July 23, 2013
Summary
Restoring CD82 expression in melanoma cells inhibits their ability to invade blood vessels and metastasize to the lungs. This finding suggests new therapeutic strategies targeting CD82 and interleukin-8 (IL-8) to combat melanoma spread.
Area of Science:
- Oncology
- Cell Biology
- Cancer Metastasis
Background:
- Melanoma cell invasion involves endothelial gap formation, facilitated by adhesion and chemokines like interleukin-8 (IL-8).
- Tetraspanins, such as CD82, are cell surface proteins implicated in cancer invasion, but their specific role in melanoma remains unclear.
Purpose of the Study:
- To investigate the functional significance of CD82 expression in melanoma cell invasion and metastasis.
- To elucidate the molecular mechanisms by which CD82 influences melanoma cell extravasation.
Main Methods:
- Induced CD82 expression in highly invasive melanoma cell lines using cDNAs.
- Assessed melanoma cell-induced gap formation, in vitro extravasation, and in vivo lung metastasis.
- Investigated molecular changes including p21 expression, Duffy antigen receptor for chemokines (DARC) binding, and vascular endothelial (VE)-cadherin disassembly.
Main Results:
- CD82 expression significantly inhibited melanoma-induced endothelial gap formation and in vitro extravasation.
- Inducible CD82 expression reduced subsequent lung metastasis development in vivo.
- Mechanistically, CD82 expression increased p21 levels upon DARC binding, induced tumor cell senescence, and disrupted IL-8-mediated VE-cadherin disassembly.
Conclusions:
- CD82 expression acts as a suppressor of melanoma cell extravasation and metastasis.
- Restoring CD82 expression and inhibiting IL-8 production represent potential therapeutic strategies for advanced melanoma.
