Exo -Functionalized Metallacages as Host-Guest Systems for the Anticancer Drug Cisplatin
Within the framework of designing new self-assembled metallosupramolecular architectures for drug delivery, seven [Pd L ] metallacages (L = 2,6-bis(pyridine-3-ylethynyl)pyridine) featuring different groups in -position, selected to enhance the cage solubility in aqueous environment, were synthesized...
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Published in | Frontiers in chemistry Vol. 7; p. 68 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
Frontiers Media S.A
18.02.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Within the framework of designing new self-assembled metallosupramolecular architectures for drug delivery, seven [Pd
L
]
metallacages (L = 2,6-bis(pyridine-3-ylethynyl)pyridine) featuring different groups in
-position, selected to enhance the cage solubility in aqueous environment, were synthesized. Thus, carboxylic acids, sugars, and PEG groups were tethered to the bispyridyl ligands directly or via disulfide bond formation, as well as via click chemistry. The ligands and respective cages were characterized by different methods, including NMR spectroscopy and high-resolution electrospray mass spectrometry (HR-ESI-MS). While the two ligands featuring carboxylic acid-functionalized groups showed improved solubility in water, the other ligands were soluble only in organic solvents. Unfortunately, all the respective self-assembled cages were also insoluble in water. Afterwards, the encapsulation properties of the anticancer drug cisplatin in selected [Pd
L
]X
cages (X =
,
) were studied by
H,
H DOSY, and
Pt NMR spectroscopy. The effect of the counter ions as well as of the polarity of the solvent in the drug encapsulation process were also investigated, and provided useful information on the host-guest properties of these experimental drug delivery systems. Our results provide further experimental support for previous studies that suggest the desolvation of guests from surrounding solvent molecules and the resulting solvent rearrangement may actually be the primary driving force for determining guest binding affinities in metallacages, in the absence of specific functional group interactions. |
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Bibliography: | Edited by: Leyong Wang, Nanjing University, China This article was submitted to Supramolecular Chemistry, a section of the journal Frontiers in Chemistry Reviewed by: Xiao-Yu Hu, Nanjing University of Aeronautics and Astronautics, China; Laia Vilà Nadal, University of Glasgow, United Kingdom; Robert Elmes, Maynooth University, Ireland |
ISSN: | 2296-2646 2296-2646 |
DOI: | 10.3389/fchem.2019.00068 |