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Dube E, Oluwole DO, Nwaji N, Nyokong T. Glycosylated zinc phthalocyanine-gold nanoparticle conjugates for photodynamic therapy: Effect of nanoparticle shape. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 203:85-95. [PMID: 29860172 DOI: 10.1016/j.saa.2018.05.081] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 05/25/2018] [Accepted: 05/26/2018] [Indexed: 06/08/2023]
Abstract
In this work, we report on the synthesis of tris-[(2,2,7,7-tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4',5'-d]pyran-5-yl)methoxy)-2-(4-benzo[d]thiazol-2-ylphenoxyphthalocyaninato] zinc(II) (complex 3) and its linkage to gold nanoparticles (AuNPs) of different shapes through S-Au/N-Au self-assembly. The conjugates of complex 3 (with both gold nanorods (AuNR) and nanospheres (AuNS)), displayed decreased fluorescence quantum yield with corresponding improved triplet and singlet quantum yields compared to complex 3 alone, however 3-AuNR showed improved properties than 3-AuNS. Complex 3 showed relatively low in vitro dark cytotoxicity against the epithelial breast cancer cells with cell survival ≥ 85% at concentration ≤ 160 μg/mL but afforded reduced photodynamic therapy activity which may be due to aggregation. 3-AuNR afforded superior PDT activity with <50% viable cells at concentration ≥ 40 μg/mL in comparison to 3-AuNS with <50% viable cells at concentration ≥ 80 μg/mL. The superior activity of 3-AuNR is attributed to the photothermal therapy effect since nanorods absorb more light at 680 nm than nanospheres.
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Affiliation(s)
- Edith Dube
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - David O Oluwole
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Njemuwa Nwaji
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Center for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
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2
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Accardo A, Morelli G. Review peptide-targeted liposomes for selective drug delivery: Advantages and problematic issues. Biopolymers 2015; 104:462-79. [DOI: 10.1002/bip.22678] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 04/01/2015] [Accepted: 05/04/2015] [Indexed: 01/18/2023]
Affiliation(s)
- Antonella Accardo
- Department of Pharmacy; CIRPeB, University of Naples “Federico II” and Invectors srl; 80134 Napoli Italy
| | - Giancarlo Morelli
- Department of Pharmacy; CIRPeB, University of Naples “Federico II” and Invectors srl; 80134 Napoli Italy
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Kimani SG, Shmigol TA, Hammond S, Phillips JB, Bruce JI, MacRobert AJ, Malakhov MV, Golding JP. Fully protected glycosylated zinc (II) phthalocyanine shows high uptake and photodynamic cytotoxicity in MCF-7 cancer cells. Photochem Photobiol 2012; 89:139-49. [PMID: 22803957 DOI: 10.1111/j.1751-1097.2012.01204.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phthalocyanine photosensitizers are effective in anticancer photodynamic therapy (PDT) but suffer from limited solubility, limited cellular uptake and limited selectivity for cancer cells. To improve these characteristics, we synthesized isopropylidene-protected and partially deprotected tetra β-glycosylated zinc (II) phthalocyanines and compared their uptake and accumulation kinetics, subcellular localization, in vitro photocytotoxicity and reactive oxygen species generation with those of disulfonated aluminum phthalocyanine. In MCF-7 cancer cells, one of the compounds, zinc phthalocyanine {4}, demonstrated 10-fold higher uptake, 5-fold greater PDT-induced cellular reactive oxygen species concentration and 2-fold greater phototoxicity than equimolar (9 μm) disulfonated aluminum phthalocyanine. Thus, isopropylidene-protected β-glycosylation of phthalocyanines provides a simple method of improving the efficacy of PDT.
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Affiliation(s)
- Stanley G Kimani
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes, UK
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4
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Giuntini F, Alonso CMA, Boyle RW. Synthetic approaches for the conjugation of porphyrins and related macrocycles to peptides and proteins. Photochem Photobiol Sci 2011; 10:759-91. [DOI: 10.1039/c0pp00366b] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Serra VV, Zamarrón A, Faustino M, Cruz MIDL, Blázquez A, Rodrigues J, Neves M, Cavaleiro J, Juarranz A, Sanz-Rodríguez F. New porphyrin amino acid conjugates: Synthesis and photodynamic effect in human epithelial cells. Bioorg Med Chem 2010; 18:6170-8. [DOI: 10.1016/j.bmc.2010.06.030] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Revised: 06/09/2010] [Accepted: 06/10/2010] [Indexed: 11/25/2022]
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Olivo M, Bhuvaneswari R, Lucky SS, Dendukuri N, Soo-Ping Thong P. Targeted Therapy of Cancer Using Photodynamic Therapy in Combination with Multi-faceted Anti-Tumor Modalities. Pharmaceuticals (Basel) 2010; 3:1507-1529. [PMID: 27713315 PMCID: PMC4033994 DOI: 10.3390/ph3051507] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 04/28/2010] [Accepted: 05/11/2010] [Indexed: 01/23/2023] Open
Abstract
Photodynamic therapy (PDT) has emerged as one of the important therapeutic options in the management of cancer and other diseases. PDT involves a tumor-localized photosensitizer (PS), which when appropriately illuminated by visible light converts oxygen into cytotoxic reactive oxygen species (ROS), that attack key structural entities within the targeted cells, ultimately resulting in necrosis or apoptosis. Though PDT is a selective modality, it can be further enhanced by combining other targeted therapeutic strategies that include the use of synthetic peptides and nanoparticles for selective delivery of photosensitizers. Another potentially promising strategy is the application of targeted therapeutics that exploit a myriad of critical pathways involved in tumorigenesis and metastasis. Vascular disrupting agents that eradicate tumor vasculature during PDT and anti-angiogenic agents that targets specific molecular pathways and prevent the formation of new blood vessels are novel therapeutic approaches that have been shown to improve treatment outcome. In addition to the well-documented mechanisms of direct cell killing and damage to the tumor vasculature, PDT can also activate the body's immune response against tumors. Numerous pre-clinical studies and clinical observations have demonstrated the immuno-stimulatory capability of PDT. Herein, we aim to integrate the most important findings with regard to the combination of PDT and other novel targeted therapy approaches, detailing its potential in cancer photomedicine.
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Affiliation(s)
- Malini Olivo
- National Cancer Centre Singapore, 11 Hospital Drive, 169610, Singapore.
- Singapore Bioimaging Consortium, Biomedical Sciences Institutes, 11 Biopolis Way, #02-02 Helios, 138667, Singapore.
- School of Physics, National University of Ireland, Galway, Ireland.
- Department of Pharmacy, National University of Singapore, No. 18 Science Drive 4, Block S4, 117543, Singapore.
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Borbas KE, Mroz P, Hamblin MR, Lindsey JS. Bioconjugatable porphyrins bearing a compact swallowtail motif for water solubility. Bioconjug Chem 2006; 17:638-53. [PMID: 16704201 PMCID: PMC3072562 DOI: 10.1021/bc050337w] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A broad range of applications requires access to water-soluble, bioconjugatable porphyrins. Branched alkyl groups attached at the branching site to the porphyrin meso position are known to impart high organic solubility. Such "swallowtail" motifs bearing a polar group (hydroxy, dihydroxyphosphoryl, dihydroxyphosphoryloxy) at the terminus of each branch have now been incorporated at a meso site in trans-AB-porphyrins. The incorporation of the swallowtail motif relies on rational synthetic methods whereby a 1,9-bis(N-propylimino)dipyrromethane (bearing a bioconjugatable tether at the 5-position) is condensed with a dipyrromethane (bearing a protected 1,5-dihydroxypent-3-yl unit at the 5-position). The two hydroxy groups in the swallowtail motif of each of the resulting zinc porphyrins can be transformed to the corresponding diphosphate or diphosphonate product. A 4-(carboxymethyloxy)phenyl group provides the bioconjugatable tether. The six such porphyrins reported here are highly water-soluble (> or =20 mM at room temperature in water at pH 7) as determined by visual inspection, UV-vis absorption spectroscopy, or 1H NMR spectroscopy. Covalent attachment was carried out in aqueous solution with the unprotected porphyrin diphosphonate and a monoclonal antibody against the T-cell receptor CD3epsilon. The resulting conjugate performed comparably to a commercially available fluorescein isothiocyanate-labeled antibody with Jurkat cells in flow cytometry and fluorescence microscopy assays. Taken together, this work enables preparation of useful quantities of water-soluble, bioconjugatable porphyrins in a compact architecture for applications in the life sciences.
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Benedetti E, Morelli G, Accardo A, Mansi R, Tesauro D, Aloj L. Criteria for the design and biological characterization of radiolabeled peptide-based pharmaceuticals. BioDrugs 2005; 18:279-95. [PMID: 15377171 DOI: 10.2165/00063030-200418050-00001] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Radiolabeled peptide-based formulations are being evaluated for their application in oncological imaging and therapy using nuclear medicine techniques. A major breakthrough in the field was the discovery and identification of the G-protein coupled receptor superfamily that are overexpressed in a variety of human cancers. These receptors act as targets for endogenous compounds, often of peptidic nature, which can be radiolabeled and, therefore, could potentially be utilized as radiopharmaceuticals. This general strategy has proven successful for application in humans in only a few cases thus far. However, the use of more sophisticated structural methodology to enhance our understanding of the interactions between the receptor and the endogenous peptide or its analogs, and a more efficient preclinical evaluation process, may help to single out the most promising compounds for further development and eventual use in the clinical application of radiopharmaceuticals. This review analyzes current methods of approaching these key points. The rational process for developing peptide-based radiopharmaceuticals is presented, from the structural analysis of the peptide-receptor interaction for the identification and modeling of the peptide analogs to the synthesis, with an appropriate metal carrier, of compounds that mimic endogenous peptides. Finally, the in vitro and in vivo biological testing and evaluation in preclinical animal models is described. To render the entire process successful, expertise in different areas of drug development is indispensable.
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Affiliation(s)
- Ettore Benedetti
- Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPeB), Dipartimento di Chimica Biologica, Università Federico II, Naples, Italy.
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Sibrian-Vazquez M, Jensen TJ, Fronczek FR, Hammer RP, Vicente MGH. Synthesis and Characterization of Positively Charged Porphyrin−Peptide Conjugates. Bioconjug Chem 2005; 16:852-63. [PMID: 16029027 DOI: 10.1021/bc050057g] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The total syntheses of 14 porphyrin conjugates containing one to four positively charged amino acids and two distinct linkers are described. All conjugates were fully characterized using spectroscopic methods, and the X-ray structure of a porphyrin isothiocyanate precursor was obtained. In vitro studies using HEp2 cells show that these conjugates have low cytotoxicity (IC50 > 250 microM) and that the extent of their cellular uptake depends significantly on the number, nature, and sequence of amino acids in the peptide, and on the presence of a centrally chelated metal ion. Metal-free conjugates bearing three consecutive arginine residues accumulated the most within cells. On the other hand, the preferential sites of subcellular localization were found to be independent from the number, nature, and sequence of amino acids in the conjugate, the linker, and coordinated metal ion; it is suggested, based on theoretical calculations, that the peptides in these conjugates fold over the porphyrin macrocycle in order to maximize intramolecular hydrophobic interactions.
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Morelli G, De Luca S, Tesauro D, Saviano M, Pedone C, Dolmella A, Visentin R, Mazzi U. CCK8 peptide derivatized with diphenylphosphine for rhenium labelling: synthesis and molecular mechanics calculations. J Pept Sci 2002; 8:373-81. [PMID: 12148786 DOI: 10.1002/psc.400] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A novel CCK8 derivative bearing a chelating agent at its N- end and its oxo-rhenium(V) complex have been synthesized and characterized. The chelating agent N-[N-13-(diphenylphosphino)propionyl]glycyl]cysteine (PN2S) ligand, the coordination set of which is made by the phosphorus atom of phosphine, the nitrogen atoms of the two amido groups and the sulphur atom of cysteine, has been used due to its high affinity towards the oxo-rhenium(V) moiety. Molecular modelling studies indicate that the CCK8 peptide adopts the right conformation for cholecystokinin receptor binding, and that modifications on the N-terminal side of CCK8 obtained by introducing chelating agents and its metal complexes should not affect the interaction with CCK(A) receptor.
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Affiliation(s)
- Giancarlo Morelli
- Centro Interuniversitario per la Ricerca sui Peptidi Bioattivi e Istituto du Biostrutture e Bioimmagini, CNR, Napoli, Italy.
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