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- Title
Identification of imaging biomarkers for the assessment of tumour response to different treatments in a preclinical glioma model.
- Authors
Lo Dico, A.; Martelli, C.; Valtorta, S.; Raccagni, I.; Diceglie, C.; Belloli, S.; Gianelli, U.; Vaira, V.; Politi, L.; Bosari, S.; Lucignani, G.; Moresco, R.; Ottobrini, L.
- Abstract
Purpose: Hypoxia-inducible factor 1α (HIF-1α) activity is one of the major players in hypoxia-mediated glioma progression and resistance to therapies, and therefore the focus of this study was the evaluation of HIF-1α modulation in relation to tumour response with the purpose of identifying imaging biomarkers able to document tumour response to treatment in a murine glioma model. Methods: U251-HRE-mCherry cells expressing Luciferase under the control of a hypoxia responsive element (HRE) and mCherry under the control of a constitutive promoter were used to assess HIF-1α activity and cell survival after treatment, both in vitro and in vivo, by optical, MRI and positron emission tomography imaging. Results: This cell model can be used to monitor HIF-1α activity after treatment with different drugs modulating transduction pathways involved in its regulation. After temozolomide (TMZ) treatment, HIF-1α activity is early reduced, preceding cell cytotoxicity. Optical imaging allowed monitoring of this process in vivo, and carbonic anhydrase IX (CAIX) expression was identified as a translatable non-invasive biomarker with potential clinical significance. A preliminary in vitro evaluation showed that reduction of HIF-1α activity after TMZ treatment was comparable to the effect of an Hsp90 inhibitor, opening the way for further elucidation of its mechanism of action. Conclusion: The results of this study suggest that the U251-HRE-mCherry cell model can be used for the monitoring of HIF-1α activity through luciferase and CAIX expression. These cells can become a useful tool for the assessment and improvement of new targeted tracers for potential theranostic procedures.
- Subjects
GLIOMAS; BIOMARKERS; TEMOZOLOMIDE; HYPOXIA-inducible factor 1; LUCIFERASES; CARBONIC anhydrase; POSITRON emission tomography
- Publication
European Journal of Nuclear Medicine & Molecular Imaging, 2015, Vol 42, Issue 7, p1093
- ISSN
1619-7070
- Publication type
Article
- DOI
10.1007/s00259-015-3040-7