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Title: (Pentamethylcyclopentadienato)rhodium complexes for delivery of the curcumin anticancer drug [Rhodium pentamethylcyclopentadienato complexes for delivery of the curcumin anti-cancer drug]

Journal Article · · European Journal of Inorganic Chemistry

[Rh III (*Cp)Cl(X,Y)] n + complexes {X, Y = Cl, PTA, n = 0 ( 2 ); X, Y = en, n = 1 ( 3 , Cl salt; 4 , PF 6 salt); X, Y = acac, n = 0 ( 5 ); X, Y = cur, n = 0 ( 6 ), where *Cp = pentamethylcyclopentadienato, curH = curcumin; PTA = 1,3,5‐triaza‐7‐phosphatricyclo[3.3.1.1]decane; en = 1,2‐ethanediamine; acac = acetylacetonato = 2,4‐pentanedionato(1–)} were synthesized from [Rh(*Cp)(µ‐Cl)Cl] 2 ( 1 ). While 2 – 5 were inactive against human epithelial A549 lung‐cancer cells in assays of cytotoxicity, and antimetastatic and proapoptotic behaviors, 6 had a cytotoxic activity similar to that of curH over 72 h, but at 24 h in real‐time cell migration assays, it was less active, showing slow release of curH. All complexes underwent ligand‐exchange reactions with biomolecules and cells within the timeframes of the assays (X‐ray absorption spectroscopy). Intracellular elemental distributions (X‐ray fluorescence microscopy) showed that 6 effectively delivered curH to cells, where it was released. Other elemental distributions and caspase activities were consistent with preapoptotic activities. As such, 6 is a promising delivery agent for bioactive ligands, such as curH. However, pure curcumin itself showed a previously unrecognized ability to promote migration of A549 cells at subtoxic concentrations in the presence of endothelial growth factor, which may be a concern for its widespread use as a nutritional supplement and as a potential drug. This aspect warrants further research.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; DE‐AC02‐06CH11357
OSTI ID:
1371909
Alternate ID(s):
OSTI ID: 1401271
Journal Information:
European Journal of Inorganic Chemistry, Vol. 2017, Issue 12; ISSN 1434-1948
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Ligand-Controlled Reactivity and Cytotoxicity of Cyclometalated Rhodium(III) Complexes: Ligand-Controlled Reactivity and Cytotoxicity of Cyclometalated Rhodium(III) Complexes journal November 2019
Developments in Platinum-Group Metals as Dual Antibacterial and Anticancer Agents journal November 2019
New Findings in Metal Complexes with Antiproliferative Activity Containing 1,3,5-Triaza-7-phosphaadamantane (PTA) and Derivative Ligands: New Findings in Metal Complexes with Antiproliferative Activity Containing 1,3,5-Triaza-7-phosphaadamantane (PTA) and Derivative Ligands journal February 2019
Nuclear localization of dirhodium( ii ) complexes in breast cancer cells by X-ray fluorescence microscopy journal January 2019
Biological properties of metal complexes of curcumin journal February 2019
Half-Sandwich Metal Complexes with β-Diketone-Like Ligands and Their Anticancer Activity: Half-Sandwich Metal Complexes with β-Diketone-Like Ligands and Their Anticancer Activity journal July 2018
Cyclometalated Rhodium(III) Complexes Based on Substituted 2-Phenylpyridine Ligands: Synthesis, Structures, Photophysics, Electrochemistry, and DNA-Binding Properties journal September 2017