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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The authors gratefully acknowledge the MIUR ALCLI “Giorgio e Silvia” no profit Association for the financial support.
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Roche contribution; ALCLI “Giorgio e Silvia” no profit Association; RFO MIUR Ex-60%; FFABR 2017 MIUR.
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SDM, CF and AA organized and concept the manuscript; AC and AP have been involved in the enrolling of patients and angiogenic factors plasma levels analysis; SDM and FP have conducted in vitro experiments and analyzed and interpreted data; SDM, AP and AC wrote the manuscript; VM, SM, CM and MED supervisioned and proofread the manuscript; SDM, VM and CF provided financial support. All the authors have contributed in its realization and have approved the submitted version.
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Dr. Alessio Cortellini received grants as speaker by MSD and Astra-Zeneca, grant consultancies by MSD, BMS, Roche, Novartis, Istituto Gentili, Astellas and Ipsen. All other authors declare that they have no conflict of interest.
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All patients provided written, informed consent to the proposed treatment option. The procedures followed were in accordance with the precepts of Good Clinical Practice. Being an observational study with no intervention a notification was sent to the local responsible committee on human experimentation (Comitato Etico per le province di L’Aquila e Teramo) (normative ref: Gazzetta Ufficiale della Repubblica Italiana n. 76 of 31-3-2008).
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432_2020_3186_MOESM1_ESM.jpg
Supplementary file 1 Inhibition exerted by Bevacizumab on tube formation ability of CM derived from colon cancer cell lines. a representative images of tube formation ability of HUVEC treated with Conditioned Media (CM) from K-RAS mutant cell lines in the presence or in the absence of Bevacizumab (0.1 mg/ml). b Histograms show that HUVECs tube formation stimulated with CM of SW48, SW480 and LS174T was significantly inhibited in the presence of Bevacizumab as determined by quantitative analysis of branching index. *p < 0.05 The inhibitory effect of Bevacizumab on HUVEC treated with CM of SW480 was significantly higher than in HUVEC treated with CM of LS174T. #p < 0.05 (JPG 55 kb)
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Delle Monache, S., Cortellini, A., Parisi, A. et al. Expression of pro-angiogenic factors as potential biomarkers in experimental models of colon cancer. J Cancer Res Clin Oncol 146, 1427–1440 (2020). https://doi.org/10.1007/s00432-020-03186-x
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DOI: https://doi.org/10.1007/s00432-020-03186-x