Abstract
Over the past few years, the development of CK2 inhibitors using small molecules has emerged as a paradigmatic approach for blocking the enzymatic activity. However, despite successful experimental validation, so far only one of such chemical compounds has entered into clinical trials. Using a different rationale to inhibit CK2, we have developed CIGB-300 as a novel hypothesis-driven peptide targeting the CK2 phosphoacceptor domain instead of the ATP-binding site. Data from in vitro studies have revealed that at least in human cell lines from solid tumors, CIGB-300 binds mainly to and inhibits CK2-mediated phosphorylation of B23/npm. Studies of the molecular and cellular events downstream this interaction have demonstrated that CIGB-300 induces apoptosis in vitro and in vivo, modulating a wide array of proteins involved in cell proliferation, apoptosis, ribosome biogenesis, drug resistance, cell motility, and adhesion among other processes. Accordingly, CIGB-300 has shown synergistic interaction with anticancer drugs, suppressing angiogenesis and exhibiting antimetastatic properties. The pharmacology of this peptide-based drug has already been investigated in cancer patients. Different Phase 1 clinical trials have shown CIGB-300 to be safe and well tolerated and have studied its pharmacokinetics after either local or systemic administration. Remarkably, during a dose-finding Phase 2 trial in women with cervical cancer, cohorts receiving CIGB-300 and chemoradiotherapy concomitantly had a higher frequency of complete response than those receiving chemoradiotherapy alone. Taken together, the data presented here summarize all relevant preclinical and clinical findings that make CIGB-300 a promising peptide-based drug for the treatment of cancer patients.
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Acknowledgements
We thank to C.I.G.B. and Biorec for supporting all of the work compiled in this review article. We also thank Alejandro Martin for reviewing the manuscript.
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Perea, S.E. et al. (2015). CIGB-300: A Promising Anti-Casein Kinase 2 (CK2) Peptide for Cancer Targeted Therapy. In: Ahmed, K., Issinger, OG., Szyszka, R. (eds) Protein Kinase CK2 Cellular Function in Normal and Disease States. Advances in Biochemistry in Health and Disease, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-319-14544-0_16
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DOI: https://doi.org/10.1007/978-3-319-14544-0_16
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