Abstract
Selective cleavage of the Glu395-Ser396 bond of brevican, one of the major proteoglycans in adult brain tissues, is thought to be important for glioma cell invasion. Our previous biochemical study demonstrated that ADAMTS-4, a member of the ADAMTS (a disintegrin and metalloproteinase with thrombospondin motifs) family, has such an activity. In the present study, we examined brevican-degrading activities of ADAMTS-1, -4 and -5 at the cellular level, and their expression and localization in human glioma tissues. In 293T transfectants expressing ADAMTS-4 or ADAMTS-5, brevican was cleaved into two major fragments in an identical pattern, but no such degradation was observed with ADAMTS-1 transfectants. When the expression levels of these ADAMTS species were examined by real-time quantitative PCR, only ADAMTS-5 was found to be overexpressed in glioblastoma tissues compared to control normal brain tissues (P <0.05). In situ hybridization and immunohistochemistry demonstrated that ADAMTS-5 is expressed predominantly in glioblastoma cells. Forced expression of ADAMTS-5 in glioma cell lines stimulated cell invasion. These results demonstrate for the first time that ADAMTS-5 is capable of degrading brevican and is overexpressed in glioblastoma cells, and suggest that ADAMTS-5 may play a role in glioma cell invasion through the cleavage of brevican.
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Acknowledgements
We are grateful for the following grant support: Grants-in-aid for young scientists (B-14770707 to M. Nakada) and for scientific research (B2–13470290 to J. Yamashita, B2-14370053 to H. Sato, and B2–11240206 to Y. Okada) from the Ministry of Education, Science and Culture of Japan, and NIH R01 (NS041332 to Y. Yamaguchi).
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Nakada, M., Miyamori, H., Kita, D. et al. Human glioblastomas overexpress ADAMTS-5 that degrades brevican. Acta Neuropathol 110, 239–246 (2005). https://doi.org/10.1007/s00401-005-1032-6
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DOI: https://doi.org/10.1007/s00401-005-1032-6