Human brain tumors that were highly resistant to ACNU, such as glioblastoma Gbl1 and metastatic brain tumor Col1 with SD10 values (microM) of above 100, expressed markedly increased amounts of 0.95 kb MGMT mRNA.
We have now detected the 5' and/or 3' alterations in 21 of 32 cases of glioblastoma with EGFR amplification; no genetic alterations have been detected in glioblastomas without EGFR amplification.
Northern blot hybridization, using total RNA from several cell lines, showed that SP-40,40 is expressed in glioblastoma and testicular tumor cells, as well as hepatoma cells.
In view of similarities noted between the cell surface antigen identified by YB5.B8 and the c-kit protein product, we performed experiments to determine whether they are identical. c-kit RNA expression in the cell lines HEL (human erythroleukemia) and A172 (glioblastoma) was shown to parallel the expression of the YB5.B8 epitope in these lines as measured by flow cytometry.
A cDNA library prepared from a human glioblastoma cell line has been introduced into a budding yeast strain that lacks CLN1 and CLN2 and is conditionally deficient for CLN3 function.
A cDNA library prepared from a human glioblastoma cell line has been introduced into a budding yeast strain that lacksCLN1 and CLN2 and is conditionally deficient for CLN3 function.
A cDNA library prepared from a human glioblastoma cell line has been introduced into a budding yeast strain that lacks CLN1 and CLN2 and is conditionally deficient for CLN3 function.
The levels of fibronectin (FN) and GFAP mRNA of ten human glioblastoma cell lines, determined by Northern blot hybridization of RNA, were related to other phenotypic characteristics [cell morphology and expression of the genes encoding platelet-derived growth factor (PDGF) receptors].
The levels of fibronectin (FN) and GFAP mRNA of ten human glioblastoma cell lines, determined by Northern blot hybridization of RNA, were related to other phenotypic characteristics [cell morphology and expression of the genes encoding platelet-derived growth factor (PDGF) receptors].
Results suggested that aberrations of the p53 gene were not correlated with the malignancy of some types of brain tumors such as anaplastic astrocytoma and glioblastoma, contrary to previous observations on colorectal cancers.
Taken together, the data provide evidence that in addition to the well-characterized 25 kDa form of TGF-beta 2glioblastoma cells also secrete a high molecular weight form (90-120 kDa) with the biological characteristics of TGF-beta 2.
In addition to these cell-bound components, the glioblastoma cells also secreted two inhibitors that formed complexes with 125I-urokinase; one was PAI-1, and the other was PN-1.