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Stefanelli M, Savioli M, Zurlo F, Magna G, Belviso S, Marsico G, Superchi S, Venanzi M, Di Natale C, Paolesse R, Monti D. Porphyrins Through the Looking Glass: Spectroscopic and Mechanistic Insights in Supramolecular Chirogenesis of New Self-Assembled Porphyrin Derivatives. Front Chem 2020; 8:587842. [PMID: 33195087 PMCID: PMC7593786 DOI: 10.3389/fchem.2020.587842] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/09/2020] [Indexed: 12/12/2022] Open
Abstract
The solvent driven aggregation of porphyrin derivatives, covalently linked to a L- or D-prolinate enantiomer, results in the stereospecific formation of species featuring remarkable supramolecular chirality, as a consequence of reading and amplification of the stereochemical information stored in the proline-appended group. Spectroscopic, kinetic, and topographic SEM studies gave important information on the aggregation processes, and on the structures of the final chiral architectures. The results obtained may be the seeds for the construction of stereoselective sensors aiming at the detection, for example, of novel emergent pollutants from agrochemical, food, and pharmaceutical industry.
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Affiliation(s)
- Manuela Stefanelli
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Marco Savioli
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Francesca Zurlo
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Gabriele Magna
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Sandra Belviso
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Giulia Marsico
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Stefano Superchi
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Mariano Venanzi
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Corrado Di Natale
- Department of Electronic Engineering, University of Rome Tor Vergata, Rome, Italy
| | - Roberto Paolesse
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Donato Monti
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy.,Department of Chemistry, University La Sapienza, Rome, Italy
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2
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Charron DM, Yousefalizadeh G, Buzzá HH, Rajora MA, Chen J, Stamplecoskie KG, Zheng G. Photophysics of J-Aggregating Porphyrin-Lipid Photosensitizers in Liposomes: Impact of Lipid Saturation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5385-5393. [PMID: 32338515 DOI: 10.1021/acs.langmuir.0c00843] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Porphyrin aggregates have attractive photophysical properties for phototherapy and optical imaging, including quenched photosensitization, efficient photothermal conversion, and unique absorption spectra. Although hydrophobic porphyrin photosensitizers have long been encapsulated into liposomes for drug delivery, little is known about the membrane properties of liposomes with large amphiphilic porphyrin compositions. In this paper, a porphyrin-lipid conjugate was incorporated into liposomes formed of saturated or unsaturated lipids to study the membrane composition-dependent formation of highly ordered porphyrin J-aggregates and disordered aggregates. Porphyrin-lipid readily phase-separates in saturated membranes, forming J-aggregates that are destabilized during the ripple phase below the main thermal transition. Porphyrin-lipid J-aggregates are photostable with a photothermal efficiency of 54 ± 6%, comparable to gold. Even at high porphyrin-lipid compositions, porphyrin J-aggregates coexist with a minority population of disordered aggregates, which are photodynamically active despite being fluorescently quenched. For photothermal applications, liposome formulations that encourage porphyrin-lipid phase separation should be explored for maximum J-aggregation.
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Affiliation(s)
- Danielle M Charron
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
| | | | - Hilde H Buzzá
- São Carlos Institute of Physics, University of São Paulo (USP), CEP 13563-120 São Carlos, Brazil
| | - Maneesha A Rajora
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
| | | | - Gang Zheng
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
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3
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Zheng Z, Li D, Liu Z, Peng HQ, Sung HHY, Kwok RTK, Williams ID, Lam JWY, Qian J, Tang BZ. Aggregation-Induced Nonlinear Optical Effects of AIEgen Nanocrystals for Ultradeep In Vivo Bioimaging. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1904799. [PMID: 31523871 DOI: 10.1002/adma.201904799] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/23/2019] [Indexed: 05/22/2023]
Abstract
Nonlinear optical microscopy has become a powerful tool in bioimaging research due to its unique capabilities of deep optical sectioning, high-spatial-resolution imaging, and 3D reconstruction of biological specimens. Developing organic fluorescent probes with strong nonlinear optical effects, in particular third-harmonic generation (THG), is promising for exploiting nonlinear microscopic imaging for biomedical applications. Herein, a simple method for preparing organic nanocrystals based on an aggregation-induced emission (AIE) luminogen (DCCN) with bright near-infrared emission is successfully demonstrated. Aggregation-induced nonlinear optical effects, including two-photon fluorescence (2PF), three-photon fluorescence (3PF), and THG, of DCCN are observed in nanoparticles, especially for crystalline nanoparticles. The nanocrystals of DCCN are successfully applied for 2PF microscopy at 1040 nm NIR-II excitation and THG microscopy at 1560 nm NIR-II excitation, respectively, to reconstruct the 3D vasculature of the mouse cerebral vasculature. Impressively, the THG microscopy provides much higher spatial resolution and brightness than the 2PF microscopy and can visualize small vessels with diameters of ≈2.7 µm at the deepest depth of 800 µm in a mouse brain. Thus, this is expected to inspire new insights into the development of advanced AIE materials with multiple nonlinearity, in particular THG, for multimodal nonlinear optical microscopy.
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Affiliation(s)
- Zheng Zheng
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Dongyu Li
- State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Zhiyang Liu
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Hui-Qing Peng
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Herman H Y Sung
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ryan T K Kwok
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ian D Williams
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Jacky W Y Lam
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Jun Qian
- State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Ben Zhong Tang
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Department of Chemical and Biological Engineering, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- HKUST-Shenzhen Research Institute, No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan, Shenzhen, 518057, China
- Center for Aggregation-Induced Emission, SCUT-HKUST Joint Research Institute, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
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4
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Lim H. Harmonic Generation Microscopy 2.0: New Tricks Empowering Intravital Imaging for Neuroscience. Front Mol Biosci 2019; 6:99. [PMID: 31649934 PMCID: PMC6794408 DOI: 10.3389/fmolb.2019.00099] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Accepted: 09/17/2019] [Indexed: 01/08/2023] Open
Abstract
Optical harmonic generation, e.g., second- (SHG) and third-harmonic generation (THG), provides intrinsic contrasts for three-dimensional intravital microscopy. Contrary to two-photon excited fluorescence (TPEF), however, they have found relatively specialized applications, such as imaging collagenous and non-specific tissues, respectively. Here we review recent advances that broaden the capacity of SHG and THG for imaging the central nervous system in particular. The fundamental contrast mechanisms are reviewed as they encode novel information including molecular origin, spectroscopy, functional probes, and image analysis, which lay foundations for promising future applications in neuroscience.
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Affiliation(s)
- Hyungsik Lim
- Department of Physics and Astronomy, Hunter College and the Graduate Center of the City University of New York, New York, NY, United States
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5
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Hou W, Lou JWH, Bu J, Chang E, Ding L, Valic M, Jeon HH, Charron DM, Coolens C, Cui D, Chen J, Zheng G. A Nanoemulsion with A Porphyrin Shell for Cancer Theranostics. Angew Chem Int Ed Engl 2019; 58:14974-14978. [PMID: 31410962 DOI: 10.1002/anie.201908664] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Indexed: 11/08/2022]
Abstract
A nanoemulsion with a porphyrin shell (NewPS) was created by the self-assembly of porphyrin salt around an oil core. The NewPS system has excellent colloidal stability, is amenable to different porphyrin salts and oils, and is capable of co-loading with chemotherapeutics. The porphyrin salt shell enables porphyrin-dependent optical tunability. The NewPS consisting of pyropheophorbide a mono-salt has a porphyrin shell of ordered J-aggregates, which produced a narrow, red-shifted Q-band with increased absorbance. Upon nanostructure dissociation, the fluorescence and photodynamic reactivity of the porphyrin monomers are restored. The spectrally distinct photoacoustic imaging (at 715 nm by intact NewPS) and fluorescence increase (at 671 nm by disrupted NewPS) allow the monitoring of NewPS accumulation and disruption in mice bearing KB tumors to guide effective photodynamic therapy. Substituting the oil core with Lipiodol affords additional CT contrast, whereas loading paclitaxel into NewPS facilitates drug delivery.
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Affiliation(s)
- Wenxiu Hou
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada.,Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Jenny W H Lou
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Jiachuan Bu
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Enling Chang
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Lili Ding
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Michael Valic
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Han Ho Jeon
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Danielle M Charron
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada.,Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON, Canada
| | - Catherine Coolens
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Daxiang Cui
- Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada
| | - Gang Zheng
- Princess Margaret Cancer Centre, University Health Network, 101 College St., PMCRT 5-354, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada.,Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON, Canada
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6
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Hou W, Lou JWH, Bu J, Chang E, Ding L, Valic M, Jeon HH, Charron DM, Coolens C, Cui D, Chen J, Zheng G. A Nanoemulsion with A Porphyrin Shell for Cancer Theranostics. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908664] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wenxiu Hou
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
- Department of Instrument Science and Engineering Shanghai Jiao Tong University Shanghai China
| | - Jenny W. H. Lou
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
- Department of Medical Biophysics University of Toronto Toronto ON Canada
| | - Jiachuan Bu
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Enling Chang
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Lili Ding
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Michael Valic
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Han Ho Jeon
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Danielle M. Charron
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
- Institute of Biomaterials and Biomedical Engineering University of Toronto Toronto ON Canada
| | - Catherine Coolens
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Daxiang Cui
- Department of Instrument Science and Engineering Shanghai Jiao Tong University Shanghai China
| | - Juan Chen
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
| | - Gang Zheng
- Princess Margaret Cancer Centre University Health Network 101 College St., PMCRT 5-354 Toronto ON Canada
- Department of Medical Biophysics University of Toronto Toronto ON Canada
- Institute of Biomaterials and Biomedical Engineering University of Toronto Toronto ON Canada
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7
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Nevozhay D, Weiger M, Friedl P, Sokolov KV. Spatiotemporally controlled nano-sized third harmonic generation agents. BIOMEDICAL OPTICS EXPRESS 2019; 10:3301-3316. [PMID: 31360600 PMCID: PMC6640828 DOI: 10.1364/boe.10.003301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/05/2019] [Accepted: 06/05/2019] [Indexed: 05/09/2023]
Abstract
Here, we present a new class of third harmonic generation (THG) imaging probes that can be activated with precise spatiotemporal control using non-linear excitation. These probes consist of lipid-coated perfluorocarbon nanodroplets with embedded visible chromophores. The droplets undergo phase transition from liquid to gas upon heating mediated by two-photon absorption of NIR light by the embedded dyes. Resulting microbubbles provide a sharp, local refractive index mismatch, which makes an excellent source of THG signal. Potential applications of these probes include activatable THG agents for biological imaging and "on-demand" delivery of various compounds under THG monitoring.
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Affiliation(s)
- Dmitry Nevozhay
- Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
- School of Biomedicine, Far Eastern Federal University, 8 Sukhanova Street, Vladivostok, 690950, Russia
- Equal contribution
| | - Michael Weiger
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
- Equal contribution
| | - Peter Friedl
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
- Cancer Genomics Centre, (CGC.nl), 3584 Utrecht, Netherlands
| | - Konstantin V. Sokolov
- Department of Imaging Physics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
- Department of Bioengineering, Rice University, 6100 Main St, Houston, TX 77005, USA
- Department of Biomedical Engineering, The University of Texas at Austin, 107 W Dean Keeton Street, Austin, TX 78712, USA
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8
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pH-Activatable tumor-targeting gold nanoprobe for near-infrared fluorescence/CT dual-modal imaging in vivo. Colloids Surf B Biointerfaces 2019; 179:56-65. [DOI: 10.1016/j.colsurfb.2019.03.049] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 03/18/2019] [Accepted: 03/22/2019] [Indexed: 12/12/2022]
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9
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Nishimura N, Nakayama S, Horiuchi A, Kumoda M, Miyatake T. Reversible Aggregation of Chlorophyll Derivative Induced by Phase Transition of Lipid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7242-7248. [PMID: 31063389 DOI: 10.1021/acs.langmuir.9b00586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Controlling the supramolecular organization of pigment molecules will provide innovative materials that exhibit variable optical properties. In nature, photosynthetic systems employ chlorophyllous supramolecules in which each pigment molecule is suitably organized in proteins, and their properties are adequately optimized by changing the structures of the surrounding amino acid residues. Here, we report a strategy for varying the aggregation behavior of a chlorophyll derivative by using a phase-transition phenomenon of lipid bilayers. Methyl pyropheophorbide a (MPP) was employed as a chlorophyllous pigment in our artificial system, and synthetic phosphatidylcholines with saturated acyl chain(s) were also used. The MPP molecules successfully accumulated within the lipid bilayer of liposomes without changing the vesicular structure. When the lipid bilayer was in a gel form (under the phase-transition temperature, Tm), the embedded MPP aggregated to yield a dimeric form showing red-shifted absorption bands and circular dichroism signals. When the solutions of MPP-containing liposomes were heated to higher temperatures than their Tm, MPP disaggregated to monomeric form as the absorption spectrum changed into its original fashion in dichloromethane. The reversible thermochromic (dis)aggregation of the MPP molecules had good cyclability. Additional careful examination of the phase transition in the MPP-lipid co-assemblies clarified that the critical temperatures of the MPP (dis)aggregation were in good agreement with the phase-transition temperatures of the pigment-containing bilayers. The reversible MPP aggregation in the lipid bilayers occurred in a wide range of temperatures (around 10-55 °C) by changing the length of the diacyl side chains of phospholipids. The reversible thermochromism of the chlorophyllous system was established by varying the nature of the surrounding lipid bilayer. This study can provide a useful strategy for making variable tetrapyrrolic aggregate systems induced by mild extrinsic stimuli.
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10
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Massiot J, Rosilio V, Ibrahim N, Yamamoto A, Nicolas V, Konovalov O, Tanaka M, Makky A. Newly Synthesized Lipid-Porphyrin Conjugates: Evaluation of Their Self-Assembling Properties, Their Miscibility with Phospholipids and Their Photodynamic Activity In Vitro. Chemistry 2018; 24:19179-19194. [PMID: 30362192 DOI: 10.1002/chem.201804865] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/23/2018] [Indexed: 01/19/2023]
Abstract
Lipid-porphyrin conjugates are considered nowadays as promising building blocks for the conception of supramolecular structures with multifunctional properties, required for efficient cancer therapy by photodynamic therapy (PDT). The synthesis of two new lipid-porphyrin conjugates coupling pheophorbide-a (Pheo-a), a photosensitizer derived from chlorophyll-a, to either chemically modified lyso-phosphatidylcholine (PhLPC) or egg lyso-sphingomyelin (PhLSM) is reported. The impact of the lipid backbone of these conjugates on their self-assembling properties, as well as on their physicochemical properties, including interfacial behavior at the air/buffer interface, fluorescence and absorption properties, thermotropic behavior, and incorporation rate in the membrane of liposomes were studied. Finally, their photodynamic activity was evaluated on esophageal squamous cell carcinoma (ESCC) and normal esophageal squamous epithelium cell lines. The liposome-like vesicles resulting from self-assembly of the pure conjugates were unstable and turned into aggregates with undefined structure within few days. However, both lipid-porphyrin conjugates could be efficiently incorporated in lipid vesicles, with higher loading rates than unconjugated Pheo-a. Interestingly, phototoxicity tests of free and liposome-incorporated lipid-porphyrin conjugates demonstrated a better selectivity in vitro to esophageal squamous cell carcinoma relative to normal cells.
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Affiliation(s)
- Julien Massiot
- Institut Galien Paris Sud, Univ Paris-Sud, CNRS, Université Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Véronique Rosilio
- Institut Galien Paris Sud, Univ Paris-Sud, CNRS, Université Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Nada Ibrahim
- Institut Galien Paris Sud, Univ Paris-Sud, CNRS, Université Paris-Saclay, 92296, Châtenay-Malabry, France
| | - Akihisa Yamamoto
- Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University, 606-8501, Kyoto, Japan
| | - Valérie Nicolas
- UMS IPSIT, Univ Paris-Sud, US 31 INSERM, UMS 3679 CNRS, 92290, Châtenay-Malabry, France
| | - Oleg Konovalov
- European Synchrotron Radiation Facility (ESRF), Grenoble Cedex 9, 38053, France
| | - Motomu Tanaka
- Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University, 606-8501, Kyoto, Japan.,Physical Chemistry of Biosystems, Physical Chemistry Institute, University of Heidelberg, 69120, Heidelberg, Germany
| | - Ali Makky
- Institut Galien Paris Sud, Univ Paris-Sud, CNRS, Université Paris-Saclay, 92296, Châtenay-Malabry, France
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11
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Khadria A, Fleischhauer J, Boczarow I, Wilkinson JD, Kohl MM, Anderson HL. Porphyrin Dyes for Nonlinear Optical Imaging of Live Cells. iScience 2018; 4:153-163. [PMID: 30240737 PMCID: PMC6147020 DOI: 10.1016/j.isci.2018.05.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/09/2018] [Accepted: 05/22/2018] [Indexed: 11/28/2022] Open
Abstract
Second harmonic generation (SHG)-based probes are useful for nonlinear optical imaging of biological structures, such as the plasma membrane. Several amphiphilic porphyrin-based dyes with high SHG coefficients have been synthesized with different hydrophilic head groups, and their cellular targeting has been studied. The probes with cationic head groups localize better at the plasma membrane than the neutral probes with zwitterionic or non-charged ethylene glycol-based head groups. Porphyrin dyes with only dications as hydrophilic head groups localize inside HEK293T cells to give SHG, whereas tricationic dyes localize robustly at the plasma membrane of cells, including neurons, in vitro and ex vivo. The copper(II) complex of the tricationic dye with negligible fluorescence quantum yield works as an SHG-only dye. The free-base tricationic dye has been demonstrated for two-photon fluorescence and SHG-based multimodal imaging. This study demonstrates the importance of a balance between the hydrophobicity and hydrophilicity of amphiphilic dyes for effective plasma membrane localization.
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Affiliation(s)
- Anjul Khadria
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK
| | - Jan Fleischhauer
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK
| | - Igor Boczarow
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK
| | - James D Wilkinson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK
| | - Michael M Kohl
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK
| | - Harry L Anderson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK.
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12
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Chitgupi U, Lovell JF, Rajendiran V. Assessing Photosensitizer Targeting Using Meso-Tetra(Carboxyphenyl) Porphyrin. Molecules 2018; 23:molecules23040892. [PMID: 29649139 PMCID: PMC6017280 DOI: 10.3390/molecules23040892] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 03/28/2018] [Accepted: 04/10/2018] [Indexed: 11/16/2022] Open
Abstract
Mesotetra(4-carboxyphenyl)porphyrin (mTCPP) is a commercially available small molecule fluorophore and photosensitizer with four free carboxylic acid groups. mTCPP can readily be conjugated with amines for facile attachment of functional groups. In this work, we synthesized and assessed tetravalent, lysine-conjugated mTCPP, for its potential applications in targeted imaging and photodynamic therapy. Fmoc-protected d-lysine or l-lysine was conjugated to mTCPP via amide coupling with the epsilon amine group of lysine, followed by Fmoc deprotection. The resulting compounds did not dissolve well in aqueous solvent, but could be solubilized with the assistance of surfactants, including cholic acid. The l-amino acid transporter (LAT1) can uptake diverse neutral l-amino acids. In vitro studies with U87 cells revealed a non-specific uptake of the hydrophobic Fmoc-protected lysine-conjugated mTCPP precursors, but not d- or l-lysine mTCPP. Likewise, only the Fmoc-protected compounds induced substantial phototoxicty in cells following incubation and irradiation with blue light. These experimental results do not provide evidence to suggest that lysine-mTCPP is able to specifically target cancer cells. However, they do highlight mTCPP as a convenient and accessible framework for assessing molecular targeting of photosensitizers.
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Affiliation(s)
- Upendra Chitgupi
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York, NY 14260, USA.
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York, NY 14260, USA.
| | - Venugopal Rajendiran
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York, NY 14260, USA.
- Department of Chemistry, School of Basic and Applied Sciences, Central University of Tamil Nadu, Thiruvarur 610005, India.
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13
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Khadria A, de Coene Y, Gawel P, Roche C, Clays K, Anderson HL. Push-pull pyropheophorbides for nonlinear optical imaging. Org Biomol Chem 2018; 15:947-956. [PMID: 28054076 DOI: 10.1039/c6ob02319c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyropheophorbide-a methyl ester (PPa-OMe) has been modified by attaching electron-donor and -acceptor groups to alter its linear and nonlinear optical properties. Regioselective bromination of the terminal vinyl position and Suzuki coupling were used to attach a 4-(N,N-diethylaminophenyl) electron-donor group. The electron-acceptor dicyanomethylene was attached at the cyclic ketone position through a Knoevenagel condensation. Four different derivatives of PPa-OMe, containing either electron-donor or electron-acceptor groups, or both, were converted to hydrophilic bis-TEG amides to generate a series of amphiphilic dyes. The absorption and emission properties of all the dyes were compared to a previously reported push-pull type porphyrin-based dye and a commercial push-pull styryl dye, FM4-64. Electrochemical measurements reveal that the electron donor group causes a greater decrease in HOMO-LUMO gap than the electron-acceptor. TD-DFT calculations on optimized geometries (DFT) of all four dyes show that the HOMO is mostly localized on the donor, 4-(N,N-diethylaminophenyl), while the LUMO is distributed around the chlorin ring and the electron-acceptor. Hyper-Rayleigh scattering experiments show that the first-order hyperpolarizabilities of the dyes increase on attaching either electron-donor or -acceptor groups, having the highest value when both the donor and acceptor groups are attached. Two-photon excited fluorescence (TPEF) and second harmonic generation (SHG) images of the bis-TEG amide attached dyes in lipid monolayer-coated droplets of water-in-oil reveal that the TPEF and SHG involve transition dipole moments in different orientations.
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Affiliation(s)
- Anjul Khadria
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK.
| | - Yovan de Coene
- Department of Chemistry, University of Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium.
| | - Przemyslaw Gawel
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK.
| | - Cécile Roche
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK.
| | - Koen Clays
- Department of Chemistry, University of Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium.
| | - Harry L Anderson
- Department of Chemistry, Oxford University, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK.
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14
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Lin L, Zhang Z, Guo Y, Liu M. Fabrication of Supramolecular Chirality from Achiral Molecules at the Liquid/Liquid Interface Studied by Second Harmonic Generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:139-146. [PMID: 29244509 DOI: 10.1021/acs.langmuir.7b04170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present the investigation into the supramolecular chirality of 5-octadecyloxy-2-(2-pyridylazo)phenol (PARC18) at water/1,2-dichloroethane interface by second harmonic generation (SHG). We observe that PARC18 molecules form supramolecular chirality through self-assembly at the liquid/liquid interface although they are achiral molecules. The bulk concentration of PARC18 in the organic phase has profound effects on the supramolecular chirality. By increasing bulk concentration, the enantiomeric excess at the interface first grows and then decreases until it eventually vanishes. Further analysis reveals that the enantiomeric excess is determined by the twist angle of PARC18 molecules at the interface rather than their orientational angle. At lower and higher bulk concentrations, the average twist angle of PARC18 molecules approaches zero, and the assemblies are achiral; whereas at medium bulk concentrations, the average twist angle is nonzero, so that the assemblies show supramolecular chirality. We also estimate the coverage of PARC18 molecules at the interface versus the bulk concentration and fit it to Langmuir adsorption model. The result indicates that PARC18 assemblies show strongest supramolecular chirality in a half-full monolayer. These findings highlight the opportunities for precise control of supramolecular chirality at liquid/liquid interfaces by manipulating the bulk concentration.
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Affiliation(s)
- Lu Lin
- National Center for Nanoscience and Technology , Beijing 100190, P. R. China
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Zhen Zhang
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
- University of Chinese Academy of Sciences , Beijing 100049, P. R. China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
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15
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Xu S, Zhou P, Zhang Z, Yang C, Zhang B, Deng K, Bottle S, Zhu H. Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid Using O2 and a Photocatalyst of Co-thioporphyrazine Bonded to g-C3N4. J Am Chem Soc 2017; 139:14775-14782. [DOI: 10.1021/jacs.7b08861] [Citation(s) in RCA: 242] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shuai Xu
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Peng Zhou
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Zehui Zhang
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Changjun Yang
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Bingguang Zhang
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Kejian Deng
- Key
Laboratory of Catalysis and Materials Sciences of the Ministry of
Education, South-Central University for Nationalities, Wuhan, 430074, People’s Republic of China
| | - Steven Bottle
- Chemistry
Discipline, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Huaiyong Zhu
- Chemistry
Discipline, Queensland University of Technology, Brisbane, QLD 4001, Australia
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16
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Huang H, Lovell JF. Advanced Functional Nanomaterials for Theranostics. ADVANCED FUNCTIONAL MATERIALS 2017; 27:1603524. [PMID: 28824357 PMCID: PMC5560626 DOI: 10.1002/adfm.201603524] [Citation(s) in RCA: 134] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Nanoscale materials have been explored extensively as agents for therapeutic and diagnostic (i.e. theranostic) applications. Research efforts have shifted from exploring new materials in vitro to designing materials that function in more relevant animal disease models, thereby increasing potential for clinical translation. Current interests include non-invasive imaging of diseases, biomarkers and targeted delivery of therapeutic drugs. Here, we discuss some general design considerations of advanced theranostic materials and challenges of their use, from both diagnostic and therapeutic perspectives. Common classes of nanoscale biomaterials, including magnetic nanoparticles, quantum dots, upconversion nanoparticles, mesoporous silica nanoparticles, carbon-based nanoparticles and organic dye-based nanoparticles, have demonstrated potential for both diagnosis and therapy. Variations such as size control and surface modifications can modulate biocompatibility and interactions with target tissues. The needs for improved disease detection and enhanced chemotherapeutic treatments, together with realistic considerations for clinically translatable nanomaterials will be key driving factors for theranostic agent research in the near future.
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Affiliation(s)
- Haoyuan Huang
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York, 14260, United States
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, New York, 14260, United States
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17
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Rhodes S, Wang X, Liang W, Cho HJ, Fang J. Templated J-Aggregate Nanotubes for the Detection of Dopamine. ACTA ACUST UNITED AC 2017. [DOI: 10.4236/msce.2017.51018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Moreno JM, Navarro I, Díaz U, Primo J, Corma A. Single-Layered Hybrid Materials Based on 1D Associated Metalorganic Nanoribbons for Controlled Release of Pheromones. Angew Chem Int Ed Engl 2016; 55:11026-30. [PMID: 27444798 PMCID: PMC5113779 DOI: 10.1002/anie.201602215] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/04/2016] [Indexed: 11/09/2022]
Abstract
A new family of stable layered organic-inorganic materials has been prepared, in one-step solvothermal process. They are based on an ordered nickel cluster-type nanoribbons separated from each other by specific alkyl (heptyl- or dodecyl-) arylic mono-carboxylate moieties acting as molecular spacers, perpendicular to the 1D inorganic chains. These organic spacers contain hydrocarbon tails with different length which control the separation level between inorganic 1D sub-units, inhibiting the 3D growth of conventional DUT-8-type metal-organic frameworks (MOFs). The lamellar nature of the materials formed was studied and confirmed by different characterization techniques, showing the structural location of individual organic and inorganic building units. They have been successfully used as a long-lasting biodegradable and water-proof materials for controlled release of chemicals, such as pheromones for sustainable treatment of insect plagues.
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Affiliation(s)
- José María Moreno
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022, Valencia, Spain
| | - Ismael Navarro
- Centro de Ecología Química Agrícola, Universidad Politécnica de Valencia, Edificio 6C, 5aplanta, Avenida de los naranjos s/n, 46022, Valencia, Spain
| | - Urbano Díaz
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022, Valencia, Spain
| | - Jaime Primo
- Centro de Ecología Química Agrícola, Universidad Politécnica de Valencia, Edificio 6C, 5aplanta, Avenida de los naranjos s/n, 46022, Valencia, Spain
| | - Avelino Corma
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022, Valencia, Spain.
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19
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Zhou J, Du X, Xu B. Regulating the Rate of Molecular Self-Assembly for Targeting Cancer Cells. Angew Chem Int Ed Engl 2016; 55:5770-5. [PMID: 27062481 PMCID: PMC4939907 DOI: 10.1002/anie.201600753] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 03/11/2016] [Indexed: 12/21/2022]
Abstract
Besides tight and specific ligand-receptor interactions, the rate regulation of the formation of molecular assemblies is one of fundamental features of cells. But the latter receives little exploration for developing anticancer therapeutics. Here we show that a simple molecular design of the substrates of phosphatases-tailoring the number of phosphates on peptidic substrates-is able to regulate the rate of molecular self-assembly of the enzyme reaction product. Such a rate regulation allows selective inhibition of osteosarcoma cells over hepatocytes, which promises to target cancer cells in a specific organ. Moreover, our result reveals that the direct measurement of the rate of the self-assembly in a cell-based assay provides precise assessment of the cell targeting capability of self-assembly. This work, as the first report establishing rate regulation of a multiple-step process to inhibit cells selectively, illustrates a fundamentally new approach for controlling the fate of cells.
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Affiliation(s)
- Jie Zhou
- Department of Chemistry, Brandeis University, 415 South St, Waltham, MA, 02454, USA
| | - Xuewen Du
- Department of Chemistry, Brandeis University, 415 South St, Waltham, MA, 02454, USA
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South St, Waltham, MA, 02454, USA.
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20
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Ng KK, Takada M, Harmatys K, Chen J, Zheng G. Chlorosome-Inspired Synthesis of Templated Metallochlorin-Lipid Nanoassemblies for Biomedical Applications. ACS NANO 2016; 10:4092-4101. [PMID: 27015124 DOI: 10.1021/acsnano.5b07151] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Chlorosomes are vesicular light-harvesting organelles found in photosynthetic green sulfur bacteria. These organisms thrive in low photon flux environments due to the most efficient light-to-chemical energy conversion, promoted by a protein-less assembly of chlorin pigments. These assemblies possess collective absorption properties and can be adapted for contrast-enhanced bioimaging applications, where maximized light absorption in the near-infrared optical window is desired. Here, we report a strategy for tuning light absorption toward the near-infrared region by engineering a chlorosome-inspired assembly of synthetic metallochlorins in a biocompatible lipid scaffold. In a series of synthesized chlorin analogues, we discovered that lipid conjugation, central coordination of a zinc metal into the chlorin ring, and a 3(1)-methoxy substitution were critical for the formation of dye assemblies in lipid nanovesicles. The substitutions result in a specific optical shift, characterized by a bathochromically shifted (72 nm) Qy absorption band, along with an increase in absorbance and circular dichroism as the ratio of dye-conjugated lipid was increased. These alterations in optical spectra are indicative of the formation of delocalized excitons states across each molecular assembly. This strategy of tuning absorption by mimicking the structures found in photosynthetic organisms may spur new opportunities in the development of biophotonic contrast agents for medical applications.
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Affiliation(s)
- Kenneth K Ng
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto , Toronto, Ontario M5G 1L7, Canada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Misa Takada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
- Department of Chemistry, Osaka University , Osaka 560-0043, Japan
| | - Kara Harmatys
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
| | - Gang Zheng
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto , Toronto, Ontario M5G 1L7, Canada
- Princess Margaret Cancer Centre, University Health Network , Toronto, Ontario M5G 1L7, Canada
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21
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Zhou J, Du X, Xu B. Regulating the Rate of Molecular Self‐Assembly for Targeting Cancer Cells. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600753] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jie Zhou
- Department of Chemistry Brandeis University 415 South St Waltham MA 02454 USA
| | - Xuewen Du
- Department of Chemistry Brandeis University 415 South St Waltham MA 02454 USA
| | - Bing Xu
- Department of Chemistry Brandeis University 415 South St Waltham MA 02454 USA
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