Role of hypoxia-inducible transcription factor 1α for progression and chemosensitivity of murine hepatocellular carcinoma
| Autor: | Anja A. Kühl, Esther Raskopf, Thorsten Cramer, Nadine Rohwer, Bertram Wiedenmann, Katjana Daskalow, Christoph Loddenkemper, Evelyne Dupuy, Volker Schmitz |
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| Rok vydání: | 2010 |
| Předmět: |
Pathology
medicine.medical_specialty Carcinoma Hepatocellular Angiogenesis Down-Regulation Mice Transgenic Cell Line Mice In vivo Drug Discovery medicine Animals Humans Transcription factor Genetics (clinical) Etoposide Cell Proliferation business.industry Liver Neoplasms Cancer Hypoxia-Inducible Factor 1 alpha Subunit medicine.disease Molecular medicine digestive system diseases Mice Inbred C57BL Hepatocellular carcinoma Disease Progression Cancer research Molecular Medicine business Liver cancer medicine.drug |
| Zdroj: | Journal of Molecular Medicine. 88:817-827 |
| ISSN: | 1432-1440 0946-2716 |
| Popis: | Hepatocellular carcinoma (HCC) is a hypervascularized tumor entity with association of arterial vessel density with poor prognosis. The hypoxia-inducible transcription factor HIF-1alpha represents a pivotal regulator of angiogenesis and is thought to determine the angiogenic nature of HCC. However, the precise role of HIF-1alpha during the pathogenesis of HCC remains elusive. We established a functional inactivation of HIF-1alpha in vitro and in vivo via RNAi and Cre/loxP-mediated recombination, respectively, to determine HIF-1alpha's role for tumor growth and chemosensitivity in transgenic and orthotopic murine HCC models. HIF-1alpha-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-1alpha-deficient tumors in the orthotopic and the transgenic HCC model, respectively. In line with the in vitro data, treatment of HIF-1alpha-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-1alpha for tumor growth and angiogenesis in two murine HCC models. However, our data point toward a significant function of HIF-1alpha in determining chemosensitivity of HCC and therefore warrant validation of HIF-1alpha-inhibitors as adjuvant therapeutic agents in clinical studies of human HCC. |
| Databáze: | OpenAIRE |
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