Abstract:
:Previous molecular analyses of human astrocytomas have identified many genetic changes associated with astrocytoma formation and progression. In an effort to identify novel gene expression changes associated with astrocytoma formation, which might reveal new potential targets for glioma therapeutic drug design, we used the B8-RAS-transgenic mouse astrocytoma model. Using multiplex gene expression profiling, we found that growth-associated protein 43 (GAP43) RNA and protein expression were lost in select human and mouse glioma cell lines. In this study, we demonstrate that re-expression of GAP43 in deficient C6 glioma cells results in growth suppression in clonogenic assays, as well as in multiple independently derived C6 glioma cell lines in vitro. GAP43-expressing C6 cells also exhibit reduced tumor growth as s.c. explants in immunocompromised mice in vivo. In addition, GAP43-expressing C6 clones demonstrate impaired cell motility and increased homophilic aggregation. GAP43 re-expression is also associated with reduced mitogen-activated protein kinase and AKT activation in C6 cells, suggesting that GAP43 functions as a novel glioma growth suppressor by modulating mitogenic signaling pathways.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Huang ZY,Wu Y,Burke SP,Gutmann DHsubject
Has Abstractpub_date
2003-06-01 00:00:00pages
2933-9issue
11eissn
0008-5472issn
1538-7445journal_volume
63pub_type
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