Fast growth associated with aberrant vasculature and hypoxia in fibroblast growth factor 8b (FGF8b) over-expressing PC-3 prostate tumour xenografts

BMC Cancer

Research Article

Jouko Sandholm¹  Heikki Minn²  Aleksi Schrey³  Ilpo Kinnunen³  Maija P Valta⁴  Pirkko L Härkönen⁵  Johanna Tuomela⁶  Jani Seppänen⁶  Olof Solin⁷  Tove J Grönroos⁸  Päivi Marjamäki⁸  Sarita Forsback⁹ 

[1] Cell Imaging Core, Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland;Department of Oncology and Radiotherapy, Turku University Hospital, Turku, Finland;Department of Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital, University of Turku, Turku, Finland;Institute of Biomedicine, Department of Cell Biology and Anatomy, University of Turku, Turku, Finland;Institute of Biomedicine, Department of Cell Biology and Anatomy, University of Turku, Turku, Finland;Department of Laboratory Medicine, MAS University Hospital, Lund University, Malmö, Sweden;Institute of Biomedicine, Department of Cell Biology and Anatomy, University of Turku, Turku, Finland;Pharmatest Services Ltd., Turku, Finland;Turku PET Centre, Accelerator Laboratory, MediCity Preclinical Research Laboratory, University of Turku and Åbo Akademi University, Turku, Finland;Turku PET Centre, MediCity Preclinical Research Laboratory, University of Turku and Åbo Akademi University, Turku, Finland;Turku PET Centre, Radiopharmaceutical Chemistry Laboratory, University of Turku and Åbo Akademi University, Turku, Finland;

关键词: Prostate Cancer;    Vascular Endothelial Growth Factor;    Intratumoral Distribution;    Vascular Endothelial Growth Factor Tumour;    Digital Autoradiography;   

DOI  :  10.1186/1471-2407-10-596

 received in 2010-04-01, accepted in 2010-10-30,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundProstate tumours are commonly poorly oxygenated which is associated with tumour progression and development of resistance to chemotherapeutic drugs and radiotherapy. Fibroblast growth factor 8b (FGF8b) is a mitogenic and angiogenic factor, which is expressed at an increased level in human prostate tumours and is associated with a poor prognosis. We studied the effect of FGF8b on tumour oxygenation and growth parameters in xenografts in comparison with vascular endothelial growth factor (VEGF)-expressing xenografts, representing another fast growing and angiogenic tumour model.MethodsSubcutaneous tumours of PC-3 cells transfected with FGF8b, VEGF or empty (mock) vectors were produced and studied for vascularity, cell proliferation, glucose metabolism and oxygenation. Tumours were evaluated by immunohistochemistry (IHC), flow cytometry, use of radiolabelled markers of energy metabolism ([18F]FDG) and hypoxia ([18F]EF5), and intratumoral polarographic measurements of pO2.ResultsBoth FGF8b and VEGF tumours grew rapidly in nude mice and showed highly vascularised morphology. Perfusion studies, pO2 measurements, [18F]EF5 and [18F]FDG uptake as well as IHC staining for glucose transport protein (GLUT1) and hypoxia inducible factor (HIF) 1 showed that VEGF xenografts were well-perfused and oxygenised, as expected, whereas FGF8b tumours were as hypoxic as mock tumours. These results suggest that FGF8b-induced tumour capillaries are defective. Nevertheless, the growth rate of hypoxic FGF8b tumours was highly increased, as that of well-oxygenised VEGF tumours, when compared with hypoxic mock tumour controls.ConclusionFGF8b is able to induce fast growth in strongly hypoxic tumour microenvironment whereas VEGF-stimulated growth advantage is associated with improved perfusion and oxygenation of prostate tumour xenografts.

【 授权许可】

CC BY   
© Tuomela et al; licensee BioMed Central Ltd. 2010