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Erschienen in: Journal of Cancer Research and Clinical Oncology 6/2020

06.04.2020 | Original Article – Cancer Research

Expression of pro-angiogenic factors as potential biomarkers in experimental models of colon cancer

verfasst von: Simona Delle Monache, Alessio Cortellini, Alessandro Parisi, Fanny Pulcini, Stefano Martellucci, Cecilia Mei, Maria Enrica Danubio, Vincenzo Mattei, Adriano Angelucci, Corrado Ficorella

Erschienen in: Journal of Cancer Research and Clinical Oncology | Ausgabe 6/2020

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Abstract

Purpose

RAS mutational status in colorectal cancer (CRC) represents a predictive biomarker of response to anti-EGFR therapy, but to date it cannot be considered an appropriate biomarker of response to anti-VEGF therapy. To elucidate the function of K-Ras in promoting angiogenesis, the effect of conditioned media from KRAS mutated and wild type colon cancer cell lines on HUVECs tubule formation ability and the correspondent production of pro-angiogenic factors have been evaluated by a specific ELISA assay.

Methods

Ras-activated signaling pathways were compared by western blot analysis and RTq-PCR. In addition, VEGF, IL-8, bFGF and HIF-1α expression was determined in K-RAS silenced cells. Furthermore, we conducted an observational study in a cohort of RAS mutated metastatic CRC patients, treated with first-line bevacizumab-based regimens, evaluating VEGF-A and IL-8 plasma levels at baseline, and during treatment.

Results

K-RAS promotes VEGF production by cancer cell lines. At the transcriptional level, this is reflected to a K-RAS dependent HIF-1α over-expression. Moreover, the HIF-1α, VEGF and FGF expression inhibition in KRAS knocked cells confirmed these results. Within the clinical part, no statistically significant correlation has been found between progression-free survival (PFS) and VEGF-A/IL-8 levels, but we cannot exclude that these biomarkers could be further investigated as predictive or prognostic biomarkers in this setting.

Conclusion

Our study confirmed the direct involvement of K-Ras in promoting angiogenesis into colon cancer cell lines.
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Metadaten
Titel
Expression of pro-angiogenic factors as potential biomarkers in experimental models of colon cancer
verfasst von
Simona Delle Monache
Alessio Cortellini
Alessandro Parisi
Fanny Pulcini
Stefano Martellucci
Cecilia Mei
Maria Enrica Danubio
Vincenzo Mattei
Adriano Angelucci
Corrado Ficorella
Publikationsdatum
06.04.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Journal of Cancer Research and Clinical Oncology / Ausgabe 6/2020
Print ISSN: 0171-5216
Elektronische ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-020-03186-x

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