Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0017638 (glioma)
 30,880 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The mRNA expression profiles from glioblastoma cells residing at the tumor core and invasive rim of a human tumor resection were compared. From a single tumor specimen, 20,000 single cells from each region were collected by laser capture microdissection. Differential expression of 50-60 cDNA bands was detected. One of the sequences overexpressed by the invasive cells showed 99% homology to the P311 gene, the protein product of which is reported to localize at focal adhesions. Relative overexpression of P311 by invading glioblastoma cells compared with tumor core was confirmed by quantitative reverse transcription-PCR of six glioblastoma specimens after laser capture microdissection collection of rim and core cells. In vitro studies using antisense oligodeoxynucleotides and integrin activation confirmed the role of P311 in supporting migration of malignant glioma cells. Immunochemistry studies confirmed the presence of the P311 protein in tumor cells, particularly at the invasive edge of human glioblastoma specimens.
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PMID:Identification and validation of P311 as a glioblastoma invasion gene using laser capture microdissection. 1135 44

P311, an 8-kDa polypeptide, was previously shown to be highly expressed in invasive glioma cells. Here, we report the functional characteristics of P311 with regard to influencing glioma cell migration. P311 is constitutively serine-phosphorylated; decreased phosphorylation is observed in migration-activated glioma cells. The primary amino acid sequence of P311 indicates a putative serine phosphorylation site (S59) near the PEST domain. Site-directed mutagenesis of S59A retarded P311 degradation and induced glioma cell motility. In contrast, S59D mutation resulted in the rapid degradation of P311 and reduced glioma cell migration. Coimmunoprecipitation coupled with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis identified Filamin A as a binding partner of P311, and immunofluorescence studies showed that both proteins colocalized at the cell periphery. Moreover, P311-induced cell migration was abrogated by inhibition of beta1 integrin function using TACbeta1A, a dominant-negative inhibitor of beta1 integrin signaling, suggesting that P311 acts downstream of beta1 signaling. Finally, overexpression of P311 or P311 S59A mutant protein activates Rac1 GTPase; small interfering RNA-mediated depletion of Rac1 suppresses P311-induced motility. Collectively, these results suggest a role for levels of P311 in regulating glioma motility and invasion through the reorganization of actin cytoskeleton at the cell periphery.
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PMID:Regulation of glioma cell migration by serine-phosphorylated P311. 1622 9

We have previously reported the presence of Dlxin-1, a member of the melanoma antigen gene (MAGE) family, in the brain and showed its function as a cell cycle arrest protein, suggesting that Dlxin-1 may have anti-proliferative functions in rapidly growing tumors. Using the cancer stem cell hypothesis, which attributes the initiation and progression of brain tumors to the cancer-initiating stem cells, we have investigated the role of Dlxin-1 in the glioma stem cells propagated by us as a cell culture system comprising of HNGC-2 cells. Our studies provide evidence about the role of Dlxin-1 as an anti-tumorigenic protein in the highly chemo-resistant glioma stem cells. Next, we show that these anti-proliferative effects are manifested by Dlxin-1 through down regulation of the activities of MMP-2 and MMP-9, and through interaction of Dlxin-1 with its target protein P311 that is involved in glioma cell invasion. In summary, we establish the roles for Dlxin-1, one as an anti-tumorigenic and anti-invasive protein in high-grade gliomas and the other as an inducer of differentiation of glioma stem cells. These two attributes, in conjunction, result in conversion of the drug-resistant brain tumor stem cells to the tumor-attenuated cells that may now be more amenable to effective therapeutic targeting.
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PMID:Dlxin-1, a member of MAGE family, inhibits cell proliferation, invasion and tumorigenicity of glioma stem cells. 2110 81