Superior Chemotherapeutic Benefits from the Ruthenium-Based
Anti-Metastatic Drug NAMI‑A through Conjugation to Polymeric
Micelles
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Abstract
Macromolecular ruthenium complexes
are a promising avenue to better,
and more selective, chemotherapeutics. NAMI-A is a ruthenium(III)
drug in Phase II clinical trials that has low cytotoxicity and is
inactive against primary tumors. However, it displays both antiangiogenic
and anti-invasive properties and has been shown to specifically target
tumor metastases, preventing both development and growth. To increase
the cytotoxicity and cell uptake of this promising drug, we designed
a biocompatible amphiphilic block copolymer capable of self-assembling
into polymeric micelles. An appropriate method for the synthesis of
a macromolecular NAMI-A drug was identifiedthe polymerization
of vinyl imidazole and subsequent addition of a ruthenium(III) precursor
complex. The cytotoxicity of these polymeric moieties was tested on
ovarian cancer A2780 and Ovcar-3 and pancreatic AsPC-1 cancer cell
lines. On average, across the tested cell lines, a 1.5 times increase
in toxicity was found for the NAMI-A copolymer micelles when compared
to the NAMI-A molecule. Furthermore, the antimetastatic potential
was assessed by evaluating the inhibitory effects on the migration
and invasion of cells against three cell lines characterized by differing
degrees of malignancy (MDA-MB-231 > MCF-7 > CHO). The NAMI-A
micelles
were shown to have an improved antimetastatic potential in comparison
to NAMI-A