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001-es BibID:BIBFORM050093
Első szerző:Petrás Miklós (orvos)
Cím:Molecular interactions of ErbB1 (EGFR) and integrin-β1 in astrocytoma frozen sections predict clinical outcome and correlate with Akt-mediated in vitro radioresistance / Miklós Petrás, Tamás Lajtos, Elza Friedländer, Álmos Klekner, Éva Pintye, Burt G. Feuerstein, János Szöllősi, György Vereb
Dátum:2013
ISSN:1522-8517
Megjegyzések:INTRODUCTION: Treatment of astrocytoma is frequently hampered by radioresistance of the tumor. In addition to overexpression of ErbB1/EGFR, functional crosstalk between receptor tyrosine kinases and cell adhesion molecules may also contribute to therapy resistance. METHODS: Acceptor photobleaching FRET was implemented on frozen sections of clinical astrocytoma to check the role of ErbB1-integrin-beta1 interaction. U251 glioma subclones were obtained by introducing extra CHR7 material or the ErbB1 gene to test the relevance and mechanism of this interaction in vitro. RESULTS: Grade IV tumors showed higher ErbB1 and integrin-beta1 expression and greater ErbB1-integrin-beta1 heteroassociation than did grade II tumors. Of these, the extent of molecular association was a single determinant of tumor grade and prognosis in stepwise logistic regression. In vitro, integrin-beta1 was upregulated, and radiosensitivity was diminished by ectopic ErbB1 expression. Great excess of ErbB1 provided colony forming advantage over medium excess but did not yield better radiation resistance or faster proliferation and decreased to medium level over time, whereas integrin-beta1 levels remained elevated and defined the extent of radioresistance. Increased expression of ErbB1 and integrin-beta1 was paralleled by decreasing ErbB1 homoassociation and increasing ErbB1-integrin-beta1 heteroassociation. Microscopic two-sided FRET revealed that pixels with higher ErbB1-integrin-beta1 heteroassociation exhibited lowed ErbB1 homoassociation, indicating competition for association partners among these molecules. Boosted Akt phosphorylation response to EGF accompanied this shift toward heteroassociation, and the consequentially increased radioresistance could be reverted by inhibiting PI3K. CONCLUSION: The clinically relevant ErbB1-integrin-beta1 heteroassociation may be used as a target of both predictive diagnostics and molecular therapy
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Biophysics
Cell Adhesion
Cell Adhesion Molecules
cell biology
EGFR
ErbB1
EXPRESSION FRET
Glioma
Hungary
In Vitro
methods
molecular interaction
Phosphorylation
Photobleaching
Receptor
tyrosine kinase
Research
therapy
TUMORS
Tyrosine
Molekulatudomány
Doktori iskola
Megjelenés:Neuro-Oncology. - 15 : 8 (2013), p. 1027-1040. -
További szerzők:Lajtos Tamás Friedländer Elza (1980-) (biofizikus) Klekner Álmos (1970-) (idegsebész) Pintye Éva (1955-) (fizikus) Feuerstein, Burt G. Szöllősi János (1953-) (biofizikus) Vereb György (1965-) (biofizikus, orvos)
Pályázati támogatás:K75752
OTKA
NK101337
OTKA
F-049050
OTKA
ETT 523/2003
Egyéb
ETT 362-01/2009
Egyéb
TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
TÁMOP-4.2.2/A-11/1/KONV-2012-0025
TÁMOP
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2.

001-es BibID:BIBFORM042485
Első szerző:Petrás Miklós (orvos)
Cím:Különböző eredetű malignus agydaganatok invazivitásának panelszerű vizsgálata / Petrás Miklós, Hutóczki Gábor, Varga Imre, Vereb György, Szöllősi János, Bognár László, Ruszthi Péter, Kenyeres Annamária, Tóth Judit, Hanzély Zoltán, Scholtz Beáta, Klekner Álmos
Dátum:2009
ISSN:0025-0244 2060-0399
Megjegyzések:Tumor cell invasion into the surrounding brain tissue is mainly responsible for the failure of radical surgical resection and successful treatment, with tumor recurrence as microdisseminated disease. Epidermal growth factor receptors (EGFRs), integrins and their ligands in the extracellular matrix (ECM)predominantly participate in the invasion process, including the cell adhesion to the surrounding microenvironment and cell migration. The extent of infi ltration of the surrounding brain tissue by malignant tumors strongly depends on the tumor cell type. Malignant gliomas show much more intensive peritumoral invasion than do metastatic tumors. In this study, the mRNA expression of 29 invasionrelated molecules (18 cell membrane receptors or receptor subunits (EGFRs and integrins) and 11 ECM components: collagens, laminins and fi bronectin) was investigated by quantitative reverse transcriptase polymerase chain reaction. Fresh frozen human tissue samples from glioblastoma (GBM) and intracerebral bronchial adenocarcinoma metastases (five pieces from each) were evaluated. Significant differenceswere established in six of the 29 molecules (ErbB1, 2, 3, integrins alpha3, 7 and beta1). To confirm ourresults at the protein level, immunohistochemical analysis of nine molecules was performed. The staining intensity differed definitely in the case of ErbB1, 2 and integrins alpha3 and beta1. Determining the differences in invasion-related molecules in tumors of different origin can help identify the exact molecular mechanisms that facilitate peritumoral infiltration by glioblastoma cells. These results should allow the selection of target molecules for potential chemotherapeutic agents directed against highly invasive malignant gliomas.
Tárgyszavak:Orvostudományok Elméleti orvostudományok magyar nyelvű folyóiratközlemény hazai lapban
EGFR
Glioblastoma
Integrins
Invasion
Metastasis
Biophysics
Hungary
egyetemen (Magyarországon) készült közlemény
Megjelenés:Magyar Onkológia. - 53 : 3 (2009), p. 253-258. -
További szerzők:Hutóczki Gábor (1983-) (Ph.D. hallgató) Varga Imre (1960-) (tüdőgyógyász) Vereb György (1965-) (biofizikus, orvos) Szöllősi János (1953-) (biofizikus) Bognár László (1958-) (idegsebész, gyermekidegsebész) Ruszthi Péter (1975-) (idegsebész szakorvos) Kenyeres Annamária (1980-) (analitikus) Tóth Judit (1958-) (onkológus szakorvos) Hanzély Zoltán Scholtz Beáta (1967-) (biokémikus, molekuláris biológus) Klekner Álmos (1970-) (idegsebész)
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