Interplay between Podoplanin, CD44s and CD44v in Squamous Carcinoma Cells

Area of Science:

• Molecular biology
• Cancer research
• Cell biology

Background:

• Podoplanin and CD44 are transmembrane glycoproteins implicated in inflammation and cancer.
• Understanding their co-expression and interaction is crucial for elucidating mechanisms in carcinogenesis.

Purpose of the Study:

• To investigate the co-expression patterns of podoplanin with CD44 standard (CD44s) and variant (CD44v) isoforms in skin inflammation and chemical carcinogenesis.
• To determine the physical interaction between podoplanin and CD44 isoforms in squamous cell carcinoma (SCC) cells.

Main Methods:

• Analysis of co-expression in hyperplastic skin and various stages of mouse-skin chemical carcinogenesis.
• Immunofluorescence confocal microscopy to assess co-localization in SCC cell lines and in vivo.
• Co-immunoprecipitation assays to confirm physical binding between podoplanin and CD44 isoforms.

Main Results:

• Podoplanin is coordinately expressed with CD44s and specific CD44v isoforms (including CD44v10 in mice, and CD44v3-10, CD44v6-10, CD44v8-10 in humans) in SCCs.
• CD44v isoforms and CD44s co-localize with podoplanin at the plasma membrane of SCC cells.
• Podoplanin physically binds to CD44s and several CD44v isoforms, with interaction modulated by glycosylation.

Conclusions:

• A functional interplay exists between podoplanin and both CD44s and CD44v isoforms in SCC.
• The identified podoplanin-CD44 interaction provides insights into the regulation of their association in cancer progression.