RESUMO
A piperazine-modified Crystal Violet was found to be able to selectively inactivate Gram-negative bacteria upon visible light irradiation but left Gram-positive bacteria less damaged, which can serve as a blueprint for the development of novel narrow-spectrum agents to replenish the current arsenal of photodynamic antimicrobial chemotherapy (PACT).
Assuntos
Antibacterianos/farmacologia , Violeta Genciana/farmacologia , Bactérias Gram-Negativas/efeitos dos fármacos , Bactérias Gram-Negativas/efeitos da radiação , Fotoquimioterapia , Piperazinas/química , Antibacterianos/química , Antibacterianos/efeitos da radiação , Cátions/química , Cátions/farmacologia , Cátions/efeitos da radiação , Relação Dose-Resposta a Droga , Violeta Genciana/química , Violeta Genciana/efeitos da radiação , Bactérias Gram-Negativas/citologia , Bactérias Gram-Positivas/citologia , Bactérias Gram-Positivas/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos da radiação , Luz , Testes de Sensibilidade Microbiana , Estrutura Molecular , Processos Fotoquímicos , Piperazina , Relação Estrutura-AtividadeRESUMO
A Ru(II) arene complex [(η(6)-p-cymene)Ru(bpy)(py-BODIPY)](PF(6))(2), where bpy is 2,2'-bipyridine and py-BODIPY is a 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene dye containing a pyridine group at the 8-position, was designed and synthesized. BODIPY modification renders the monodentate pyridine ligand with long wavelength absorbing capability, and an absorption maximum at 504 nm. Upon selective irradiation of the absorption band of the py-BODIPY ligand, the dissociation of the monodentate ligand occurs efficiently, followed by substitution by 9-ethylguanine if it is present in the solution. The photoinduced ligand dissociation quantum yield was measured to be 4.1% at 480 nm. The photoinduced electron transfer from the BODIPY chromophore to the Ru(II) arene moiety plays an important role in the ligand dissociation. Such a photosensitization strategy can be utilized to develop novel anticancer metallodrugs that may respond to light in the phototherapeutic window (650-900 nm).
Assuntos
Antineoplásicos/química , Compostos de Boro/química , Compostos Organometálicos/química , Rutênio/química , Antineoplásicos/síntese química , Ligantes , Estrutura Molecular , Compostos Organometálicos/síntese química , Processos FotoquímicosRESUMO
Hypocrellin B (HB), a naturally occurring photosensitizer, has been extensively and intensively studied as a promising photodynamic therapy (PDT) agent. In this work, three new oxovanadium(IV) complexes were designed and synthesized with HB as a bridging ligand and phen (1,10-phenanthroline, complex 1), tmp (3,4,7,8-tetramethyl-1,10-phenanthroline, complex 2) and dpq (dipyrido[3,2-f:2'3'-h]quinoxaline, complex 3) as terminal ligands. The use of a diimine terminal ligand avoids the formation of polymeric complexes and ensures the three VO(2+)-HB complexes possess a definite molecular formula and molecular weight to meet the single component requirement for an ideal PDT agent. Compared to HB, the VO(2+)-HB complexes exhibit improved water solubility, enhanced absorptivity in the phototherapeutic window, increased binding affinity toward dsDNA, and similar singlet oxygen quantum yield, therefore advanced DNA photocleavage activity. Both the DNA binding constants and photo nuclease activities of the complexes follow the order 2 (tmp) > 3 (dpq) > 1 (phen), demonstrating the importance of the binding affinity to biomolecules, which improves the bioavailability of reactive oxygen species. Our work opens a new avenue for the development of HB-based PDT agents.
Assuntos
Compostos Organometálicos/síntese química , Perileno/análogos & derivados , Fármacos Fotossensibilizantes/síntese química , Quinonas/síntese química , Vanadatos/química , DNA/química , Clivagem do DNA/efeitos dos fármacos , Eletroquímica , Conformação Molecular , Compostos Organometálicos/química , Perileno/síntese química , Perileno/química , Fotoquímica , Fotoquimioterapia , Fármacos Fotossensibilizantes/química , Quinonas/química , Solubilidade , Espectrometria de Massas por Ionização por ElectrosprayRESUMO
Hypocrellin B (HB), a naturally occurring photosensitizer, has been extensively and intensively studied as a promising photodynamic therapy (PDT) agent. In this work, a new Co(III) complex [Co(2)(HB)(tmp)(4)](4+) (tmp=3,4,7,8-tetramethyl-1,10-phenanthroline) was designed and synthesized with HB as bridging ligand and tmp as terminal ligand. [Co(2)HB(tmp)(4)](4+) exhibits improved water solubility, enhanced absorptivity in the phototherapeutic window, increased binding affinity and DNA photocleavage capability toward dsDNA with respect to HB. The photodynamic activity of [Co(2)(HB)(tmp)(4)](4+) stems from its (1)O(2) photosensitization ability, in sharp contrast to [Cu(2)(HB)(tmp)(2)](2+) which relies on superoxide anion radical (O(2)(-)) and hydroxyl radical (·OH) to photocleave DNA, though the both complexes possess similar electrochemical properties. The remarkable difference between the photodynamic mechanisms of [Co(2)(HB)(tmp)(4)](4+) and [Cu(2)(HB)(tmp)(2)](2+) was discussed in detail.
Assuntos
Cobalto/química , Complexos de Coordenação/química , Clivagem do DNA , Perileno/análogos & derivados , Fármacos Fotossensibilizantes/química , Quinonas/química , Complexos de Coordenação/síntese química , DNA/química , DNA Circular/química , Radical Hidroxila/química , Perileno/química , Fármacos Fotossensibilizantes/síntese química , Solubilidade , EspectrofotometriaRESUMO
Five new dinuclear Cu(II) complexes were designed and synthesized, using hypocrellin B, a naturally occurring photosensitizer that has received extensive studies as promising photodynamic therapy (PDT) agent, as bridging ligand, and five kinds of diimine ligands, including 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), 3,4,7,8-tetramethyl-1,10-phenanthroline (tmp), dipyrido[3,2-d:2',3'-f]quinoxaline (dpq), and dipyrido[3,2-a:2',3'-c]phenazene (dppz), as terminal ligands, respectively. The Cu(2+)-HB complexes exhibit improved water solubility, enhanced absorptivity in the phototherapeutic window of 600-900 nm, and increased binding affinity toward dsDNA than their parent HB. The biologically accessible redox potential of Cu(II)/Cu(I) couple renders the five Cu(2+)-HB complexes chemical nuclease activities in the presence of reducing agent such as ascorbic acid. Moreover, the readily available redox potential of Cu(II)/Cu(I) couple switches the photodynamic activity from type II mechanism (singlet oxygen mechanism) for HB to type I mechanism (radical mechanism) for the Cu(2+)-HB complexes. Of the five Cu(2+)-HB complexes, complex 3-5 with terminal diimine ligands of tmp, dpq, and dppz, respectively, can photocleave supercoiled pBR322 DNA more efficiently than HB. These findings open a new avenue for the development of the HB derivatives with higher photodynamic activity and better clinical applicability.
Assuntos
Cobre/química , DNA/química , Compostos Organometálicos/síntese química , Perileno/análogos & derivados , Quinonas/química , Animais , Bovinos , Eletroquímica , Estrutura Molecular , Compostos Organometálicos/química , Oxirredução , Perileno/química , Fotoquímica , Solubilidade , Água/químicaRESUMO
Protein affinity is of importance for porphyrins in their application in photodynamic therapy (PDT). A new Phenol Red-modified porphyrin (R-TPP) was designed and synthesized to fully take advantage of the binding character of Phenol Red towards protein. Detailed comparisons of absorption spectra, fluorescence spectra, n-octanol/water partition coefficients, (1)O(2) quantum yields, as well as protein photocleaving abilities between R-TPP and its parent porphyrin Br-TPP clearly demonstrate the benefits stemming from the modification of Phenol Red. On one hand, the presence of Phenol Red moiety greatly enhances the binding affinity of R-TPP towards model proteins (bovine serum albumin and hen egg lysozyme), and therefore improves the availability of (1)O(2). On the other hand, the presence of Phenol Red moiety provides R-TPP with amphiphilic character, and therefore restricts aggregation and favors the generation of (1)O(2). As a result, R-TPP photocleaves proteins efficiently, showing promising application potential in PDT.
Assuntos
Fenolsulfonaftaleína/química , Fenolsulfonaftaleína/farmacologia , Fármacos Fotossensibilizantes/química , Fármacos Fotossensibilizantes/farmacologia , Porfirinas/química , Porfirinas/farmacologia , Proteínas/metabolismo , Animais , Bovinos , Galinhas , Muramidase/metabolismo , Fenolsulfonaftaleína/síntese química , Fotoquimioterapia , Fotólise , Fármacos Fotossensibilizantes/síntese química , Porfirinas/síntese química , Ligação Proteica , Soroalbumina Bovina/metabolismoRESUMO
The sequential replacement of a bpy ligand (bpy = 2,2'-bipyridine) by a dpb ligand (dpb = 2,3-bis(2-pyridyl) benzoquinoxaline) in the series [Ru(bpy)(3-n)(dpb)(n)](2+) (n = 1-3) leads to a remarkable increase of the excited state lifetime, the (1)O(2) quantum yield, and the binding affinity toward dsDNA, rendering both [Ru(bpy)(dpb)(2)](2+) and [Ru(dpb)(3)](2+) efficient DNA photocleavage activities upon red light irradiation (>or=600 nm).
Assuntos
2,2'-Dipiridil/química , DNA/química , Compostos Organometálicos/química , Rutênio/química , Clivagem do DNA , Ligantes , Luz , Estrutura Molecular , Oxigênio/química , Fotoquímica , Teoria QuânticaRESUMO
Ruthenium(II) polypyridyl complexes with long-wavelength absorption and high singlet-oxygen quantum yield exhibit attractive potential in photodynamic therapy. A new heteroleptic Ru(II) polypyridyl complex, [Ru(bpy)(dpb)(dppn)](2+) (bpy=2,2'-bipyridine, dpb=2,3-bis(2-pyridyl)benzoquinoxaline, dppn=4,5,9,16-tetraaza-dibenzo[a,c]naphthacene), is reported, which exhibits a (1)MLCT (MLCT: metal-to-ligand charge transfer) maximum as long as 548 nm and a singlet-oxygen quantum yield as high as 0.43. Steady/transient absorption/emission spectra indicate that the lowest-energy MLCT state localizes on the dpb ligand, whereas the high singlet-oxygen quantum yield results from the relatively long (3)MLCT(Ru-->dpb) lifetime, which in turn is the result of the equilibrium between nearly isoenergetic excited states of (3)MLCT(Ru-->dpb) and (3)pipi*(dppn). The dppn ligand also ensures a high binding affinity of the complex towards DNA. Thus, the combination of dpb and dppn gives the complex promising photodynamic activity, fully demonstrating the modularity and versatility of heteroleptic Ru(II) complexes. In contrast, [Ru(bpy)(2)(dpb)](2+) shows a long-wavelength (1)MLCT maximum (551 nm) but a very low singlet-oxygen quantum yield (0.22), and [Ru(bpy)(2)(dppn)](2+) shows a high singlet-oxygen quantum yield (0.79) but a very short wavelength (1)MLCT maximum (442 nm).
Assuntos
Compostos Organometálicos/química , Piridinas/química , Rutênio/química , Absorção , Cristalografia por Raios X , Ligantes , Estrutura Molecular , Fotoquímica , Teoria Quântica , Oxigênio Singlete/química , Espectrofotometria UltravioletaRESUMO
Four cobalt(III) polypyridyl complexes, [Co(phen)(3-)(n)(dpq)(n)](3+) (phen=1,10-phenanthroline, dpq=dipyrido[3,2-f:2',3'-h]-quinoxaline) (n=0, 1, 2, and 3) were synthesized and the influences of the dpq ligand on the photophysical properties, electrochemical properties, DNA binding affinities, as well as photonuclease activities of the complexes, were examined in detail. The presence of dpq ligand increases the DNA binding affinities of the corresponding complexes remarkably with respect to [Co(phen)(3)](3+). With the sequential substitution of phen ligand by dpq ligand, the (1)O(2) quantum yields of the corresponding complexes are enhanced greatly. As a result, the photonuclease activities follow the order of [Co(dpq)(3)](3+)>[Co(phen)(dpq)(2)](3+)>[Co(phen)(2)(dpq)](3+)>>[Co(phen)(3)](3+). It was found all the examined complexes can generate ()OH upon UV irradiation, and ()OH is also involved in DNA photocleavage as reactive oxygen species.
Assuntos
Cobalto/química , Complexos de Coordenação/farmacologia , Clivagem do DNA , DNA/efeitos dos fármacos , Desoxirribonucleases/farmacologia , Fotólise , Animais , Bovinos , Complexos de Coordenação/síntese química , Complexos de Coordenação/química , DNA/química , Desoxirribonucleases/síntese química , Desoxirribonucleases/química , Ligantes , Fenantrolinas/químicaRESUMO
Five ruthenium(II) complexes, [Ru(II)(tpy)(dppz)(py-R)](2+) (tpy = 2,2':6',2''-terpyridine; dppz = dipyrido[3,2-a:2',3'-c]phenazine; py-R = 4-substituted pyridine; R = N(CH(3))(2), NH(2), OCH(3), H, NO(2)), were synthesized; and the substituent effects on the photophysical property, electrochemical property, DNA binding, and DNA photocleavage of the complexes were examined carefully. Increasing the electron-donating ability of the substituent R from NO(2) to N(CH(3))(2) leads to a cathodic shift of Ru-based oxidation potential, a red shift of the (1)MLCT absorption at room temperature and the (3)MLCT emission at 77 K, and enhancement of the DNA photocleavage ability. DNA photocleavage control experiments and the EPR spin-trapping technique confirm that the photocleavage abilities of the complexes originate from (1)O(2) production. Time-resolved absorption spectra suggest that the (3)MLCT lifetime plays an important role in the photosensitized (1)O(2) generation of these complexes, which in turn depends strongly on the electron-donating ability of the substituent R. By changing the substituent of pyridine from the electron-withdrawing to the electron-donating group, the photocleavage abilities of the complexes varied from inactive to active, providing a new strategy for the development of DNA photocleavers of tpy-based Ru(II) complexes.
Assuntos
DNA/química , Compostos de Rutênio/química , Espectroscopia de Ressonância de Spin Eletrônica , Ligantes , Ressonância Magnética Nuclear Biomolecular , Fotoquímica , Marcadores de SpinRESUMO
The effects of hypocrellin A (HA) on the conformational changes of hemoglobin and myoglobin were studied using synchronous fluorescence spectroscopy. The results indicated that HA can change the conformation of these two proteins, leading to the change in the micro-environment of tryptophane and tyrosine residues from hydrophobic environment to hydrophilic environment to different extent.
Assuntos
Hemoglobinas/química , Mioglobina/química , Perileno/análogos & derivados , Quinonas/química , Espectrometria de Fluorescência , Estrutura Molecular , Perileno/química , FenolRESUMO
An enhanced photodamaging ability towards CT-DNA was achieved in a tyrosine-modified hypocrellin B by improving the affinity of the sensitizer to DNA.
Assuntos
Dano ao DNA/efeitos dos fármacos , Dano ao DNA/efeitos da radiação , DNA/química , DNA/metabolismo , Perileno/análogos & derivados , Perileno/química , Perileno/farmacologia , Quinonas/química , Quinonas/farmacologia , Tirosina/química , Animais , Sítios de Ligação , Bovinos , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Oxigênio/metabolismo , Perileno/síntese química , Perileno/metabolismo , Quinonas/síntese química , Quinonas/metabolismo , EspectrofotometriaRESUMO
A 1:1 complex of lanthanum ion with hypocrellin A (La3+-HA) possessing high singlet oxygen generation efficiency, large absorbance in the phototherapeutic window, and great water solubility exhibits promising photodynamic properties.
RESUMO
The unique behavior of a new Ru(II) diimine complex, Ru(bpy)(2)(L)(2+) (where L is 4-methyl-4'-[p-(dimethyl- amino)-alpha-styryl]-2,2'-bipyridine, bpy is 2,2'-bipyridine), was studied in detail. Due to the strong electron donating property of the amino group, an ILCT (intraligand charge transfer) state is involved either in the absorption spectra or in the time-resolved emission spectra. Dual emission based on (3)MLCT and (3)ILCT states was observed at room temperature for the first time via a time-resolved technique in Ru(II) diimine complexes.