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Functionalization of Ruthenium(II) Terpyridine Complexes with Cyclic RGD Peptides To Target Integrin Receptors in Cancer Cells
Author(s) -
Hahn Eva M.,
EstradaOrtiz Natalia,
Han Jiaying,
Ferreira Vera F. C.,
Kapp Tobias G.,
Correia João D. G.,
Casini Angela,
Kühn Fritz E.
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201601094
Subject(s) - chemistry , bioconjugation , integrin , cytotoxicity , receptor , cancer cell , combinatorial chemistry , stereochemistry , biochemistry , in vitro , cancer , medicine
The lack of selectivity for cancer cells and the resulting negative impact on healthy tissue is a severe drawback of actual cancer chemotherapy. Tethering of cytotoxic drugs to targeting vectors such as peptides, which recognize receptors overexpressed on the surface of tumor cells, is one possible strategy to overcome such a problem. The pentapeptide cyc(RGDfK) targets the integrin receptor α v β 3 , important for tumor growth and metastasis formation. In this work, two terpyridine‐based Ru II complexes were prepared and for the first time conjugated to cyc(RGDfK) through amide bond formation, which resulted in a monomeric and a dimeric bioconjugate. Both Ru II complexes were found to bind strongly and selectively to integrin α v β 3 , and the dimeric molecule displayed a 20‐fold higher affinity to the receptor than the monomeric one. However, the cytotoxicity of the complexes and related bioconjugates against human A549 and SKOV‐3 cell lines is still not sufficient for application as anticancer agents. Nevertheless, considering the high selectivity for integrin receptor α v β 3 , the synthesis of Ru‐based bioconjugates with cyc(RGDfK) paves a promising way towards the design of effective targeted anticancer agents.