Tenascin-C protein is induced by transforming growth factor-beta1 but does not correlate with time to tumor progression in high-grade gliomas.

Autor: Hau P; Department of Neurology, University of Regensburg, Universitätsstrasse 84, 93053, Regensburg, Germany. peter.hau@medbo.de, Kunz-Schughart LA, Rümmele P, Arslan F, Dörfelt A, Koch H, Lohmeier A, Hirschmann B, Müller A, Bogdahn U, Bosserhoff AK
Jazyk: angličtina
Zdroj: Journal of neuro-oncology [J Neurooncol] 2006 Mar; Vol. 77 (1), pp. 1-7. Date of Electronic Publication: 2005 Nov 15.
DOI: 10.1007/s11060-005-9000-5
Abstrakt: Background: Tenascin-C is an extracellular matrix protein known to correlate with prognosis in patients with glioblastoma, probably by stimulation of invasion and neoangiogenesis. Transforming Growth Factor-beta1 (TGF-beta1) plays an important role in the biology of high-grade gliomas, partly by regulating invasion of these tumors into parenchyma. This study was designed to evaluate if TGF-beta1 induces the expression and deposition of Tenascin-C in the extracellular matrix of high-grade gliomas which may be pivotal for the invasion of these tumors into healthy parenchyma.
Methods: A series of 20 high-grade gliomas was stained immunohistochemically with Tenascin-C- and TGF-beta1- specific antibodies. Expression levels of both proteins were evaluated and correlated with each other, time to progression and molecular and morphological markers of invasion. A quantitative PCR assay was performed evaluating the induction of Tenascin-C mRNA by treatment with TGF-beta1 in vitro.
Results: Tenascin-C was expressed in 18 of 19 (95%) evaluable tumors, whereas 14 of 20 tumors (70%) expressed TGF-beta1 in a significant percentage of cells. Treatment with TGF-beta1 did induce the expression of Tenascin-C at the mRNA and protein level in vitro. The expression of Tenascin-C and TGF-beta1 did neighter statistically correlate with each other nor with time to progression.
Conclusion: In our series, Tenascin-C and TGF-beta1 were expressed in the vast majority of high-grade gliomas. We could not detect a correlation of one of the proteins with time to progression. Nevertheless, we describe induction of Tenascin-C by TGF-beta1, possibly providing a mechanism for the invasion of high-grade gliomas into healthy parenchyma.
Databáze: MEDLINE
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