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Arenaza-Corona A, Couce-Fortúnez MD, de Blas A, Morales-Morales D, Santillan R, Höpfl H, Rodríguez-Blas T, Barba V. Further Approaches in the Design of Antitumor Agents with Response to Cell Resistance: Looking toward Aza Crown Ether-dtc Complexes. Inorg Chem 2020; 59:15120-15134. [PMID: 33000942 DOI: 10.1021/acs.inorgchem.0c02068] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The dianionic aza crown ether-dtc N,N'-bis(dithiocarbamate)-1,10-diaza-18-crown-6 (L2-) is a versatile ligand capable of yielding binuclear complexes with group 10 elements, also known as Ni-triade, [μ-(κ2-S,-S'-L)M2(PPh3)4]Cl2 (M = Pd (1), Pt (2)), [μ-(κ2-S,-S'-L)M2(PPh3)4](BPh4)2 (M = Pd (3), Pt (4)), and μ-(κ-S,-S'-L)Ni2(PPh3)2Cl2 (5), and has proven to be an excellent option to the design of metal-based drugs able to provide multiple response to cell resistance. Palladium and platinum complexes, 1 and 2, were tested for cytotoxicity in the human cervix carcinoma cell line HeLa-229, the human ovarian carcinoma cell line A2780, and the cisplatin-resistant mutant A2780cis, finding significant activity toward all three cancer cell lines, with low micromolar IC50 values, comparable to cisplatin. Markedly, against the cisplatin resistant cell line A2780cis, compound 2 exhibits better cytotoxic activity than the clinical drug (IC50 = 2.3 ± 0.2 μM for 2 versus 3.6 ± 0.5 μM for cisplatin). Moreover, an enhancement of the antitumor response is achieved when adding an equimolar amount of alkali metal chloride (NaCl or KCl) to the medium, for instance, testing compound 1 against the cisplatin-resistant A2780cis cells, the IC50 decreases from 9.3 ± 0.4 to 7.4 ± 0.3 and 5.4 ± 0.1 μM, respectively, after addition of the salt solution. For the platinum derivative 2, the IC50 improves by ca. 40% reaching 1.3 ± 0.1 μM when potassium chloride is added. Likewise, the resistant factor found for 2 (RF = 1) confirms that this complex circumvents cisplatin-resistance in A2780cis and is improved with the addition of potassium chloride (RF = 0.65). The presence of the aza crown ether moiety as linker in the systems studied herein is a key point since, in addition to allowing and facilitating interaction with alkali metal ions, this unit is flexible enough to adapt to a variety of environments, as confirmed by the X-ray crystal structures described, where different conformations and ways to fold in are found. In order to gain insight into the electronic and structural facts involved in the interaction of complex 2 with the alkali metal ions, a DFT study was performed, and the description of the molecular electrostatic potentials (MEPs) is also presented.
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Affiliation(s)
- Antonino Arenaza-Corona
- Grupo METMED, Departamento de Quı́mica & Centro de Investigaciones Cientı́ficas Avanzadas (CICA), Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain.,Centro de Investigaciones Quı́micas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, C.P., 62209 Cuernavaca, Morelos, Mexico
| | - M Delfina Couce-Fortúnez
- Departamento de Quı́mica Inorgánica, Instituto de Investigación Sanitaria Galicia Sur, Facultade de Quı́mica, Universidad de Vigo, 36310 Vigo, Spain
| | - Andrés de Blas
- Grupo METMED, Departamento de Quı́mica & Centro de Investigaciones Cientı́ficas Avanzadas (CICA), Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - David Morales-Morales
- Instituto de Quı́mica, Universidad Nacional Autónoma de México, Cd. Universitaria, Circuito Exterior, Coyoacán, 04510 Ciudad de México, Mexico
| | - Rosa Santillan
- Departamento de Quı́mica, Centro de Investigación y de Estudios Avanzados del IPN, 07000 Ciudad de México, Mexico
| | - Herbert Höpfl
- Centro de Investigaciones Quı́micas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, C.P., 62209 Cuernavaca, Morelos, Mexico
| | - Teresa Rodríguez-Blas
- Grupo METMED, Departamento de Quı́mica & Centro de Investigaciones Cientı́ficas Avanzadas (CICA), Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Victor Barba
- Centro de Investigaciones Quı́micas-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, C.P., 62209 Cuernavaca, Morelos, Mexico
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Arenaza-Corona A, Villamil-Ramos R, Guerrero-Álvarez J, Höpfl H, Barba V. Bis-Dithiocarbamates derived from 1,10-diaza-18-crown-6 as ligand tectons for 1D, 2D and 3D supramolecular structure arrangements. CrystEngComm 2020. [DOI: 10.1039/c9ce01755k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of 1,10-diaza-18-crown-6 with CS2 in the presence of a base (MOH or Et3N) generates bis-dithiocarbamate salts with a 1D, 2D or 3D supramolecular solid-state structure based on M–O–M and M–S–M bridging and/or O/N–H⋯O/S hydrogen bonding.
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Affiliation(s)
- Antonino Arenaza-Corona
- Centro de Investigaciones Químicas-IICBA
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
| | - Raúl Villamil-Ramos
- Centro de Investigaciones Químicas-IICBA
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
| | - Jorge Guerrero-Álvarez
- Centro de Investigaciones Químicas-IICBA
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
| | - Herbert Höpfl
- Centro de Investigaciones Químicas-IICBA
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
| | - Victor Barba
- Centro de Investigaciones Químicas-IICBA
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- Mexico
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