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• W2016371380 abstract "Medulloblastoma spreads by leptomeningeal dissemination rather than by infiltration that characterizes other CNS tumors, eg, gliomas. This study represents an initial attempt to identify both the molecules that mediate medulloblastoma adhesion to leptomeninges and the pathways that are key to survival and proliferation of tumor following adhesion. As a first step in molecule identification, we produced adhesion of D283 medulloblastoma cells to the extracellular matrix (ECM) of H4 glioma cells in vitro. Within this context, D283 cells preferentially expressed the α9 and β1 integrin subunits; antibody and disintegrin blockade of α9 and β1 binding eliminated the adhesion. The H4 ECM was enriched in tenascin, a binding partner for the α9β1 integrin heterodimer. Purified tenascin-C supported D283 cell adhesion. The adhesion was blocked by antibodies to α9 and β1 integrin. In vivo data were similar; immunohistochemistry of primary human medulloblastomas with leptomeningeal extension demonstrated increased expression of α9 and β1 integrins as well as tenascin at the interface of brain and leptomeningeal tumor. These data suggest that tumor-cell expressions of α9 and β1 integrins in combination with extracellular tenascin are necessary for medulloblastoma adhesion to the leptomeninges. As a first step in the identification of pathways that mediate survival and proliferation of tumor following adhesion, we demonstrated that adhesion to H4 ECM was associated with survival and proliferation of D283 cells as well as activation of the MAPK pathway in a growth factor deficient environment. Antibody blockade of α9 and β1 integrin binding that eliminated adhesion also eliminated the in vitro survival benefit. These data suggest that adhesion of medulloblastoma to the meninges is necessary for the survival and proliferation of these tumor cells at the secondary site." @default.
• W2016371380 created "2016-06-24" @default.
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• W2016371380 date "2008-11-01" @default.
• W2016371380 modified "2023-10-16" @default.
• W2016371380 title "Integrins mediate adhesion of medulloblastoma cells to tenascin and activate pathways associated with survival and proliferation" @default.
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• W2016371380 doi "https://doi.org/10.1038/labinvest.2008.89" @default.
• W2016371380 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2679155" @default.
• W2016371380 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18794852" @default.
• W2016371380 hasPublicationYear "2008" @default.
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