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CD44 Mediates Human Glioma Cell Adhesion and Invasion in Vitro¹

Institute of Psychiatry, Department of Neuropathology, De Crespigny Park, Denmark Hill, London SE5 8AF, United Kingdom

Human gliomas are characterized by their invasion of normal brain structures irrespective of their grade of malignancy. Factors involved in the control of this invasive behavior are poorly documented. Human gliomas have also been found to express CD44 adhesion molecules. Expression of splice variants of CD44 has been correlated to metastasis in nonglial solid tumors. In this study, 80µm porosity polycarbonate filters incorporated in modified Boyden chambers and coated with the extracellular matrix composite Matrigel were used to investigate the role of CD44 in invasion of eight human glioma cell lines in vitro. Invasion of Matrigel was found to be inhibited to different extents by a CD44 monoclonal antibody. Moreover, this invasion was highly inhibited in two cell lines and completely arrested in five other glioma cell lines by a CD44-specific antisense oligonucleotide which inhibited CD44 expression. In addition, adhesion of glioma cells to fibronectin, laminin, vitronectin, and collagen I was inhibited by the CD44 monoclonal antibody. These results strongly suggest that CD44 is involved in human glioma cell invasion in vitro, probably through its role in cell interactions with extracellular matrix proteins. Interference with glioma invasion, by targeting CD44 expression, may be envisaged in animal models.

¹ This work was supported by a grant from the Leverhulme Trust.

² To whom requests for reprints should be addressed.

Received 2/14/94. Accepted 6/15/94.

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