| Autor: |
Daskalow, Katjana, Rohwer, Nadine, Raskopf, Esther, Dupuy, Evelyne, Kühl, Anja, Loddenkemper, Christoph, Wiedenmann, Bertram, Schmitz, Volker, Cramer, Thorsten |
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| Zdroj: |
Journal of Molecular Medicine; Aug2010, Vol. 88 Issue 8, p817-827, 11p |
| Abstrakt: |
Hepatocellular carcinoma (HCC) is a hypervascularized tumor entity with association of arterial vessel density with poor prognosis. The hypoxia-inducible transcription factor HIF-1α represents a pivotal regulator of angiogenesis and is thought to determine the angiogenic nature of HCC. However, the precise role of HIF-1α during the pathogenesis of HCC remains elusive. We established a functional inactivation of HIF-1α in vitro and in vivo via RNAi and Cre/loxP-mediated recombination, respectively, to determine HIF-1α’s role for tumor growth and chemosensitivity in transgenic and orthotopic murine HCC models. HIF-1α-deficient HCC cells displayed significantly reduced anchorage-independent growth and enhanced sensitivity toward etoposide, while basic cellular proliferation was unaffected. Analysis of gross tumor growth failed to detect reduced growth of HIF-1α-deficient tumors in the orthotopic and the transgenic HCC model, respectively. In line with the in vitro data, treatment of HIF-1α-deficient tumors with etoposide resulted in greater antiproliferative efficacy when compared to wild-type mice. Taken together, our study does not support a pivotal role of HIF-1α for tumor growth and angiogenesis in two murine HCC models. However, our data point toward a significant function of HIF-1α in determining chemosensitivity of HCC and therefore warrant validation of HIF-1α-inhibitors as adjuvant therapeutic agents in clinical studies of human HCC. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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