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Xie X, Zhai J, Zhou X, Guo Z, Lo PC, Zhu G, Chan KWY, Yang M. Magnetic Particle Imaging: From Tracer Design to Biomedical Applications in Vasculature Abnormality. Adv Mater 2024; 36:e2306450. [PMID: 37812831 DOI: 10.1002/adma.202306450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/14/2023] [Indexed: 10/11/2023]
Abstract
Magnetic particle imaging (MPI) is an emerging non-invasive tomographic technique based on the response of magnetic nanoparticles (MNPs) to oscillating drive fields at the center of a static magnetic gradient. In contrast to magnetic resonance imaging (MRI), which is driven by uniform magnetic fields and projects the anatomic information of the subjects, MPI directly tracks and quantifies MNPs in vivo without background signals. Moreover, it does not require radioactive tracers and has no limitations on imaging depth. This article first introduces the basic principles of MPI and important features of MNPs for imaging sensitivity, spatial resolution, and targeted biodistribution. The latest research aiming to optimize the performance of MPI tracers is reviewed based on their material composition, physical properties, and surface modifications. While the unique advantages of MPI have led to a series of promising biomedical applications, recent development of MPI in investigating vascular abnormalities in cardiovascular and cerebrovascular systems, and cancer are also discussed. Finally, recent progress and challenges in the clinical translation of MPI are discussed to provide possible directions for future research and development.
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Affiliation(s)
- Xulin Xie
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Jiao Zhai
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Xiaoyu Zhou
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Zhengjun Guo
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
- Department of Oncology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010, China
| | - Pui-Chi Lo
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Guangyu Zhu
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Kannie W Y Chan
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Mengsu Yang
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
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2
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Tam LKB, Lo PC, Cheung PCK, Ng DKP. A Tetrazine-Caged Carbon-Dipyrromethene as a Bioorthogonally Activatable Fluorescent Probe. Chem Asian J 2023; 18:e202300562. [PMID: 37489571 DOI: 10.1002/asia.202300562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/19/2023] [Accepted: 07/25/2023] [Indexed: 07/26/2023]
Abstract
A water-soluble 1,2,4,5-tetrazine-substituted carbon-dipyrromethene (C-DIPY) was synthesized from the previously reported carbonyl pyrrole dimer through a two-step procedure. Owing to the presence of a tetrazine moiety, the fluorescence emission of this compound was largely quenched in phosphate-buffered saline at pH 7.4. Upon addition of a bicyclo[6.1.0]non-4-yne (BCN) derivative, the tetrazine-based quenching component of the compound was disrupted through the inverse electron-demand Diels-Alder reaction to restore the fluorescence in up to 6.6-fold. This bioorthogonal activation was also demonstrated using U-87 MG human glioblastoma cells, in which the fluorescence intensity of this C-DIPY could be enhanced by 8.7-fold upon post-incubation with the BCN derivative. The results showed that this tetrazine-caged C-DIPY can serve as a bioorthogonally activatable fluorescent probe for bioimaging. The compound, however, was found to reside preferentially in the lysosomes instead of the mitochondria of the cells as predicted based on its cationic character, which could be attributed to its energy-dependent endocytic cellular uptake pathway, for which lysosomes are the end station.
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Affiliation(s)
- Leo K B Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
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Deng Z, Li H, Chen S, Wang N, Liu G, Liu D, Ou W, Xu F, Wang X, Lei D, Lo PC, Li YY, Lu J, Yang M, He ML, Zhu G. Near-infrared-activated anticancer platinum(IV) complexes directly photooxidize biomolecules in an oxygen-independent manner. Nat Chem 2023:10.1038/s41557-023-01242-w. [PMID: 37353602 DOI: 10.1038/s41557-023-01242-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Accepted: 05/16/2023] [Indexed: 06/25/2023]
Abstract
Conventional light-driven cancer therapeutics require oxygen and visible light to indirectly damage biomolecules, limiting their efficacy in deep, hypoxic tumours. Here we report the use of near-infrared-activated small-molecule Pt(IV) photooxidants to directly oxidize intracellular biomolecules in an oxygen-independent manner, achieving controllable and effective elimination of cancer stem cells. These Pt(IV) complexes accumulate in the endoplasmic reticulum and show low toxicity in the dark. Upon irradiation, the resultant metal-enhanced photooxidation effect causes them to robustly photooxidize survival-related biomolecules, induce intense oxidative stress, disrupt intracellular pH (pHi) homeostasis and initiate nonclassical necrosis. In vivo experiments confirm that the lead photooxidant can effectively inhibit tumour growth, suppress metastasis and activate the immune system. Our study validates the concept of metal-enhanced photooxidation and the subsequent chemotherapeutic applications, supporting the development of such localized photooxidants to directly damage intracellular biomolecules and decrease pHi as a strategy for effective metal-based drugs.
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Affiliation(s)
- Zhiqin Deng
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
| | - Huangcan Li
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Shu Chen
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
| | - Na Wang
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
| | - Gongyuan Liu
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
| | - Danjun Liu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong SAR, P. R. China
| | - Weihui Ou
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Feijie Xu
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Xiong Wang
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Dangyuan Lei
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Yang Yang Li
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Jian Lu
- Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Mengsu Yang
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Ming-Liang He
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China.
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China.
| | - Guangyu Zhu
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China.
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China.
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Lo PC, Ng DKP, Pandey RK, Zimcik P. Photodynamic Therapy: An Innovative and Versatile Treatment Modality Triggered by Light. Chempluschem 2023:e202300159. [PMID: 37042437 DOI: 10.1002/cplu.202300159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Guest Editors Pui-Chi Lo, Dennis Ng, Ravindra Pandey, and Petr Zimcik introduce the Special Collection on Photodynamic Therapy and give an overview of the developments and challenges in this exciting field.
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Affiliation(s)
- Pui-Chi Lo
- Department of Biomedical Sciences and Tung Biochemical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Ravindra K Pandey
- Photodynamic Therapy Center, Cell Stress Biology, Roswell Park Comprehensive Cancer Center Buffalo, New York, 14263, USA
| | - Petr Zimcik
- Faculty of Pharmacy, Charles University, Ak. Heyrovského 1203, Hradec Kralove, 50005, Czech Republic
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Tam LKB, Chu JCH, He L, Yang C, Han KC, Cheung PCK, Ng DKP, Lo PC. Enzyme-Responsive Double-Locked Photodynamic Molecular Beacon for Targeted Photodynamic Anticancer Therapy. J Am Chem Soc 2023; 145:7361-7375. [PMID: 36961946 PMCID: PMC10080691 DOI: 10.1021/jacs.2c13732] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2023]
Abstract
An advanced photodynamic molecular beacon (PMB) was designed and synthesized, in which a distyryl boron dipyrromethene (DSBDP)-based photosensitizer and a Black Hole Quencher 3 moiety were connected via two peptide segments containing the sequences PLGVR and GFLG, respectively, of a cyclic peptide. These two short peptide sequences are well-known substrates of matrix metalloproteinase-2 (MMP-2) and cathepsin B, respectively, both of which are overexpressed in a wide range of cancer cells either extracellularly (for MMP-2) or intracellularly (for cathepsin B). Owing to the efficient Förster resonance energy transfer between the two components, this PMB was fully quenched in the native form. Only upon interaction with both MMP-2 and cathepsin B, either in a buffer solution or in cancer cells, both of the segments were cleaved specifically, and the two components could be completely separated, thereby restoring the photodynamic activities of the DSBDP moiety. This PMB could also be activated in tumors, and it effectively suppressed the tumor growth in A549 tumor-bearing nude mice upon laser irradiation without causing notable side effects. In particular, it did not cause skin photosensitivity, which is a very common side effect of photodynamic therapy (PDT) using conventional "always-on" photosensitizers. The overall results showed that this "double-locked" PMB functioned as a biological AND logic gate that could only be unlocked by the coexistence of two tumor-associated enzymes, which could greatly enhance the tumor specificity in PDT.
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Affiliation(s)
- Leo K B Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Jacky C H Chu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Lin He
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Caixia Yang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Kam-Chu Han
- Department of Clinical Pathology, Pamela Youde Nethersole Eastern Hospital, Chai Wan, Hong Kong, China
| | - Peter Chi Keung Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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He L, Xu F, Li Y, Jin H, Lo PC. Cupric-ion-promoted fabrication of oxygen-replenishing nanotherapeutics for synergistic chemo and photodynamic therapy against tumor hypoxia. Acta Biomater 2023; 162:57-71. [PMID: 36944404 DOI: 10.1016/j.actbio.2023.03.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/16/2023] [Accepted: 03/13/2023] [Indexed: 03/23/2023]
Abstract
Mixing a glutathione (GSH)-responsive carboxy zinc(II) phthalocyanine (ZnPc*) and CuSO4·5H2O in water with or without the presence of the anticancer drug SN38 resulted in the formation of self-assembled nanotherapeutics labeled as ZnPc*/Cu/SN38@NP and ZnPc*/Cu@NP, respectively. The Cu2+ ions not only promoted the self-assembly of the carboxy phthalocyanine through metal complexation, but also catalyzed the transformation of H2O2 to oxygen via a catalase-like reaction, rendering an oxygen-replenishing property to the nanosystems. Both nanosystems exhibited high stability in aqueous media, but the nanoparticles disassembled gradually in an acidic or GSH-enriched environment and inside human colorectal adenocarcinoma HT29 cells, releasing the encapsulated therapeutic components. The disassembly process together with the activation by the intracellular GSH led to relaxation of the intrinsic quenching of the nanophotosensitizers and restoration of the photoactivities of ZnPc*. Under a hypoxic condition, ZnPc*/Cu/SN38@NP could attenuate the intracellular hypoxia level and maintain the photodynamic activity due to its Cu2+-promoted oxygen-replenishing ability. The photodynamic effect of ZnPc* and the anticancer effect of SN38 worked cooperatively, causing substantial apoptotic cell death. The dual therapeutic actions could also effectively inhibit the tumor growth in HT29 tumor-bearing nude mice without initiating notable adverse effects to the mice. STATEMENT OF SIGNIFICANCE: The oxygen-dependent nature of photodynamic therapy generally reduces its efficacy against tumor hypoxia, which is a common characteristic of advanced solid tumors and usually leads to resistance toward various anticancer therapies. We report herein a facile approach to assemble a glutathione-responsive carboxy phthalocyanine-based photosensitizer and an anticancer drug in aqueous media, in which Cu(II) ions were used to promote the self-assembly through metal complexation and catalyze the conversion of H2O2 to oxygen through a catalase-like reaction, making the resulting nanoparticles possessing an oxygen-replenishing property that could promote the photodynamic effect against hypoxic cancer cells and tumors. The use of Cu(II) ions to achieve the aforementioned dual functions in the fabrication of advanced nano-photosensitizing systems has not been reported.
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Affiliation(s)
- Lin He
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Feijie Xu
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Yongxin Li
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Honglin Jin
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences and Tung Biomedical Sciences Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
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Xiong J, Xue EY, Wu Q, Lo PC, Ng DKP. A tetrazine-responsive isonitrile-caged photosensitiser for site-specific photodynamic therapy. J Control Release 2023; 353:663-674. [PMID: 36503072 DOI: 10.1016/j.jconrel.2022.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 12/01/2022] [Accepted: 12/07/2022] [Indexed: 12/15/2022]
Abstract
We report herein a versatile and efficient bioorthogonal strategy to actualise targeted delivery and site-specific activation of photosensitisers for precise antitumoural photodynamic therapy. The strategy involved the use of an isonitrile-caged distyryl boron dipyrromethene-based photosensitiser, labelled as NC-DSBDP, of which the photoactivities could be specifically activated upon conversion of the meso ester substituent to carboxylate initiated by the [4 + 1] cycloaddition with a tetrazine derivative. By using two tetrazines conjugated with a galactose moiety or the GE11 peptide, labelled as gal-Tz and GE11-Tz, we could selectively label the cancer cells overexpressed with the asialoglycoprotein receptor and the epidermal growth factor receptor respectively. Upon encountering the internalised NC-DSBDP, these tetrazines triggered the "ester-to-carboxylate" transformation of this compound, activating its fluorescence and reactive oxygen species generation inside the target cells. The bioorthogonal activation was also demonstrated in vivo, leading to effective photo-eradication of the tumour in nude mice.
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Affiliation(s)
- Junlong Xiong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Evelyn Y Xue
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Qianqian Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China; Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
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Nagy JA, Semple C, Lo P, Rutkove SB. Assessing the therapeutic impact of resveratrol in ALS SOD1-G93A mice with electrical impedance myography. Front Neurol 2022; 13:1059743. [PMID: 36619925 PMCID: PMC9813785 DOI: 10.3389/fneur.2022.1059743] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/07/2022] [Indexed: 12/24/2022] Open
Abstract
To aid in the identification of new treatments for amyotrophic lateral sclerosis (ALS), convenient biomarkers are needed to effectively and uniformly measure drug efficacy. To this end, we assessed the effects of the nutraceutical resveratrol (RSV) on disease onset and overall survival in SOD1-G93A (ALS) mice and compared several standard biomarkers including body mass, motor score (MS), paw grip endurance (PGE), and compound motor action potential (CMAP) amplitude, with the technique of electrical impedance myography (EIM) to follow disease progression. Eighteen ALS mice (nine females, nine males) received RSV in the chow (dose: 120 mg/kg/day) starting at 8 weeks of age; 19 ALS mice (nine females, 10 males) received normal chow; 10 wild type (WT) littermates (five females, five males) fed standard chow served as controls. Biomarker assessments were performed weekly beginning at 8 weeks. No differences in either disease onset or overall survival were found between RSV-treated and untreated ALS mice of either sex; moreover, all biomarkers failed to identify any beneficial effect of RSV when administered at this dose. Therefore, for the comparative evaluation of the ability of the various biomarkers to detect the earliest symptoms of disease, data from all animals (i.e., RSV-treated and untreated ALS mice of both sexes) were combined. Of the biomarkers tested, EIM impedance values, i.e., surface EIM longitudinal phase at 50 kHz (LP 50 kHz), and CMAP amplitude showed the earliest significant changes from baseline. LP 50 kHz values showed a rate of decline equivalent to that of CMAP amplitude and correlated with both PGE and CMAP amplitude [Spearman rho = 0.806 (p = 0.004) and 0.627 (p = 0.044), respectively]. Consistent with previous work, these findings indicate that surface EIM can serve as an effective non-invasive biomarker for preclinical drug testing in rodent models of ALS.
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Abstract
Nanovaccines, a new generation of vaccines that use nanoparticles as carriers and/or adjuvants, have been widely used in the prevention and treatment of various diseases, including cancer. Nanovaccines have sparked considerable interest in cancer therapy due to a variety of advantages, including improved access to lymph nodes (LN), optimal packing and presentation of antigens, and induction of a persistent anti-tumor immune response. As a delivery system for cancer vaccines, various types of nanoparticles have been designed to facilitate the delivery of antigens and adjuvants to lymphoid organs and antigen-presenting cells (APCs). Particularly, some types of nanoparticles are able to confer an immune-enhancing capability and can themselves be utilized for adjuvant-like effect for vaccines, suggesting a direction for a better use of nanomaterials and the optimization of cancer vaccines. However, this role of nanoparticles in vaccines has not been well studied. To further elucidate the role of self-adjuvanting nanovaccines in cancer therapy, we review the mechanisms of antitumor vaccine adjuvants with respect to nanovaccines with self-adjuvanting properties, including enhancing cross-presentation, targeting signaling pathways, biomimicking of the natural invasion process of pathogens, and further unknown mechanisms. We surveyed self-adjuvanting cancer nanovaccines in clinical research and discussed their advantages and challenges. In this review, we classified self-adjuvanting cancer nanovaccines according to the underlying immunomodulatory mechanism, which may provide mechanistic insights into the design of nanovaccines in the future.
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Affiliation(s)
- Zhiyun Liao
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Jing Huang
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Honglin Jin
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China. .,College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Kunyu Yang
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
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Mai S, Zhu X, Wan EYC, Wu S, Yonathan JN, Wang J, Li Y, Ma JYW, Zuo B, Tse DYY, Lo PC, Wang X, Chan KM, Wu DM, Xiong W. Postnatal eye size in mice is controlled by SREBP2-mediated transcriptional repression of Lrp2 and Bmp2. Development 2022; 149:276005. [PMID: 35833708 PMCID: PMC9382895 DOI: 10.1242/dev.200633] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 06/20/2022] [Indexed: 11/20/2022]
Abstract
Eye size is a key parameter of visual function, but the precise mechanisms of eye size control remain poorly understood. Here, we discovered that the lipogenic transcription factor sterol regulatory element-binding protein 2 (SREBP2) has an unanticipated function in the retinal pigment epithelium (RPE) to promote eye size in postnatal mice. SREBP2 transcriptionally represses low density lipoprotein receptor-related protein 2 (Lrp2), which has been shown to restrict eye overgrowth. Bone morphogenetic protein 2 (BMP2) is the downstream effector of Srebp2 and Lrp2, and Bmp2 is suppressed by SREBP2 transcriptionally but activated by Lrp2. During postnatal development, SREBP2 protein expression in the RPE decreases whereas that of Lrp2 and Bmp2 increases as the eye growth rate reduces. Bmp2 is the key determinant of eye size such that its level in mouse RPE inversely correlates with eye size. Notably, RPE-specific Bmp2 overexpression by adeno-associated virus effectively prevents the phenotypes caused by Lrp2 knock out. Together, our study shows that rapid postnatal eye size increase is governed by an RPE-derived signaling pathway, which consists of both positive and negative regulators of eye growth.
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Affiliation(s)
- Shuyi Mai
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China.,Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Hong Kong, China
| | - Xiaoxuan Zhu
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | - Esther Yi Ching Wan
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | - Shengyu Wu
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | | | - Jun Wang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | - Ying Li
- College of Information and Computer, Taiyuan University of Technology, 030024 Taiyuan, China
| | - Jessica Yuen Wuen Ma
- Centre for Myopia Research, School of Optometry, Hong Kong Polytechnic University, Hong Kong, China
| | - Bing Zuo
- Centre for Myopia Research, School of Optometry, Hong Kong Polytechnic University, Hong Kong, China
| | - Dennis Yan-Yin Tse
- Centre for Myopia Research, School of Optometry, Hong Kong Polytechnic University, Hong Kong, China.,Research Centre for SHARP Vision, Hong Kong Polytechnic University, Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China
| | - Xin Wang
- Department of Surgery, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Kui Ming Chan
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China
| | - David M Wu
- Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA
| | - Wenjun Xiong
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China
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11
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Hu Y, Sun Y, Wan C, Dai X, Wu S, Lo PC, Huang J, Lovell JF, Jin H, Yang K. Microparticles: biogenesis, characteristics and intervention therapy for cancers in preclinical and clinical research. J Nanobiotechnology 2022; 20:189. [PMID: 35418077 PMCID: PMC9006557 DOI: 10.1186/s12951-022-01358-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 03/08/2022] [Indexed: 12/24/2022] Open
Abstract
Extracellular vesicles (EVs), spherical biological vesicles, mainly contain nucleic acids, proteins, lipids and metabolites for biological information transfer between cells. Microparticles (MPs), a subtype of EVs, directly emerge from plasma membranes, and have gained interest in recent years. Specific cell stimulation conditions, such as ultraviolet and X-rays irradiation, can induce the release of MPs, which are endowed with unique antitumor functionalities, either for therapeutic vaccines or as direct antitumor agents. Moreover, the size of MPs (100–1000 nm) and their spherical structures surrounded by a lipid bilayer membrane allow MPs to function as delivery vectors for bioactive antitumor compounds, with favorable phamacokinetic behavior, immunostimulatory activity and biological function, without inherent carrier-specific toxic side effects. In this review, the mechanisms underlying MP biogenesis, factors that influence MP production, properties of MP membranes, size, composition and isolation methods of MPs are discussed. Additionally, the applications and mechanisms of action of MPs, as well as the main hurdles for their applications in cancer management, are introduced.
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Affiliation(s)
- Yan Hu
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yajie Sun
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Chao Wan
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Xiaomeng Dai
- Department of Medical Oncology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Shuhui Wu
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong kong, China
| | - Jing Huang
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Honglin Jin
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China. .,College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Kunyu Yang
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
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12
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Liu Y, Geng Y, Yue B, Lo PC, Huang J, Jin H. Injectable Hydrogel as a Unique Platform for Antitumor Therapy Targeting Immunosuppressive Tumor Microenvironment. Front Immunol 2022; 12:832942. [PMID: 35111169 PMCID: PMC8801935 DOI: 10.3389/fimmu.2021.832942] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 12/27/2021] [Indexed: 12/19/2022] Open
Abstract
Cancer immunotherapy can boost the immune response of patients to eliminate tumor cells and suppress tumor metastasis and recurrence. However, immunotherapy resistance and the occurrence of severe immune-related adverse effects are clinical challenges that remain to be addressed. The tumor microenvironment plays a crucial role in the therapeutic efficacy of cancer immunotherapy. Injectable hydrogels have emerged as powerful drug delivery platforms offering good biocompatibility and biodegradability, minimal invasion, convenient synthesis, versatility, high drug-loading capacity, controlled drug release, and low toxicity. In this review, we summarize the application of injectable hydrogels as a unique platform for targeting the immunosuppressive tumor microenvironment.
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Affiliation(s)
- Yushuai Liu
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yuanyuan Geng
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Beilei Yue
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong, SAR China
| | - Jing Huang
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Honglin Jin
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
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13
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Liu G, Choi MH, Ma H, Guo X, Lo PC, Kim J, Zhang L. Bioorthogonal Conjugation-Assisted Purification Method for Profiling Cell Surface Proteome. Anal Chem 2022; 94:1901-1909. [PMID: 35019258 DOI: 10.1021/acs.analchem.1c05187] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Surface biotinylation has been widely adapted in profiling the cellular proteome associated with the plasma membrane. However, the workflow is subject to interference from the cytoplasmic biotin-associated proteins that compete for streptavidin-binding during purification. Here we established a bioorthogonal conjugation-assisted purification (BCAP) workflow that utilizes the Staudinger chemoselective ligation to label and isolate surface-associated proteins while minimizing the binding of endogenous biotin-associated proteins. Label-free quantitative proteomics demonstrated that BCAP is efficient in isolating cell surface proteins with excellent reproducibility. Subsequently, we applied BCAP to compare the surface proteome of proliferating and senescent mouse embryonic fibroblasts (MEFs). Among the results, EHD2 was identified and validated as a novel protein that is enhanced at the cell surface of senescent MEFs. We expect that BCAP will have broad applications in profiling cell surface proteomes in the future.
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Affiliation(s)
- Guopan Liu
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, 518057, China
| | - Ming Ho Choi
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China
| | - Haiying Ma
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China
| | - Xuejiao Guo
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China
| | - Jinyong Kim
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China
| | - Liang Zhang
- Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon 999077, Hong Kong China.,Key Laboratory of Biochip Technology, Biotech and Health Centre, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, 518057, China
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14
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Tam LKB, Yu L, Wong RCH, Fong WP, Ng DKP, Lo PC. Dual Cathepsin B and Glutathione-Activated Dimeric and Trimeric Phthalocyanine-Based Photodynamic Molecular Beacons for Targeted Photodynamic Therapy. J Med Chem 2021; 64:17455-17467. [PMID: 34846143 DOI: 10.1021/acs.jmedchem.1c01634] [Citation(s) in RCA: 3] [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: 11/29/2022]
Abstract
Two dual stimuli-activated photosensitizers were developed, in which two or three glutathione (GSH)-responsive 2,4-dinitrobenzenesulfonate (DNBS)-substituted zinc(II) phthalocyanine units were connected via one or two cathepsin B-cleavable Gly-Phe-Leu-Gly peptide linker(s). These dimeric and trimeric phthalocyanines were fully quenched in the native form due to the photoinduced electron transfer to the DNBS substituents and the self-quenching of the phthalocyanine units. In the presence of GSH and cathepsin B, or upon internalization into A549 and HepG2 cancer cells, these probes were activated through the release of free phthalocyanine units. The intracellular fluorescence intensity was increased upon post-incubation with GSH ester or reduced upon pre-treatment with a cathepsin B inhibitor. Upon light irradiation, these photosensitizers became highly cytotoxic with IC50 values of 0.21-0.39 μM. The photocytotoxicity was also dependent on the intracellular GSH and cathepsin B levels. The results showed that these conjugates could serve as smart photosensitizers for targeted photodynamic therapy.
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Affiliation(s)
- Leo K B Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Ligang Yu
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Roy C H Wong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Wing-Ping Fong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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15
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Guo X, Jin H, Lo PC. Encapsulating an acid-activatable phthalocyanine-doxorubicin conjugate and the hypoxia-sensitive tirapazamine in polymeric micelles for multimodal cancer therapy. Biomater Sci 2021; 9:4936-4951. [PMID: 34075948 DOI: 10.1039/d1bm00443c] [Citation(s) in RCA: 3] [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: 12/11/2022]
Abstract
A zinc(ii) phthalocyanine (ZnPc) was conjugated to doxorubicin (Dox) via an acid-labile hydrazone linker. The resulting ZnPc-Dox conjugate was then encapsulated into polymeric micelles formed through self-assembly of a block copolymer of poly(ethylene glycol) and poly(d,l-lactide) both in the absence and presence of the hypoxia-activated prodrug tirapazamine (TPZ) to give ZnPc-Dox@micelles and ZnPc-Dox/TPZ@micelles respectively. These polymeric micelles exhibited an excellent stability in aqueous media, but underwent disassembly in an acidic environment. Upon internalisation into HT29 human colorectal carcinoma cells, fluorescence due to ZnPc and Dox could be observed in the cytoplasm and nucleus respectively for both nanosystems. This observation suggested the disassembly of the polymeric micelles and the cleavage of the hydrazone linker in ZnPc-Dox in the acidic intracellular compartments. These micelles were slightly cytotoxic against HT29 cells in the dark due to the chemotherapeutic effect of Dox and/or TPZ. Upon light irradiation, ZnPc-Dox@micelles showed higher cytotoxicity. The IC50 value under a normoxic condition (0.35 μM based on ZnPc-Dox) was significantly lower than that under hypoxia (>1 μM). With an additional therapeutic component, ZnPc-Dox/TPZ@micelles exhibited higher photocytotoxicity with IC50 values of 0.20 μM and 0.78 μM under normoxia and hypoxia respectively. It is believed that the photodynamic action of this nanosystem consumed the intracellular oxygen and hence triggered the hypoxia-mediated chemotherapeutic action of TPZ. The multimodal antitumor effects of these polymeric micelles were also validated on HT29 tumour-bearing nude mice.
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Affiliation(s)
- Xuejiao Guo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. and Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
| | - Honglin Jin
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. and Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
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16
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Lu L, Sun Y, Wan C, Hu Y, Lo PC, Lovell JF, Yang K, Jin H. Role of intravital imaging in nanomedicine-assisted anti-cancer therapy. Curr Opin Biotechnol 2021; 69:153-161. [PMID: 33476937 DOI: 10.1016/j.copbio.2020.12.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 12/22/2020] [Accepted: 12/27/2020] [Indexed: 01/07/2023]
Abstract
Although nanomedicines have provided promising anti-tumor effects in cancer animal models, their clinical success remains limited. One of the most significant barriers in the clinical translation of nanomedicines is that they consist of multiple components, each of which may have different toxicities and therapeutic effects. Intravital imaging provides high spatial and temporal resolution for visualizing nanomedicine-mediated interactions between immune cells and tumor cells in real-time. Intravital imaging can facilitate the in vivo evaluation of the properties and effects of nanomedicines, such as their ability to cross the tumor vasculature, specifically eliminate the cancer cells, and modulate the immune cells found in the tumor microenvironment (TME). Thus, intravital imaging can provide direct evidence of nanomedicine's intravital behavior to better understand mechanism and accelerate clinical translation. In this review, we summarize several applications and latest advances in intravital imaging in nanomedicine-assisted anti-cancer therapy and discuss future perspectives in the field.
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Affiliation(s)
- Lisen Lu
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yajie Sun
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chao Wan
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yan Hu
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Kunyu Yang
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
| | - Honglin Jin
- Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
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17
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Gao D, Lo PC. Combined pH-responsive chemotherapy and glutathione-triggered photosensitization to overcome drug-resistant hepatocellular carcinoma — a SPP/JPP Young Investigator Award paper. J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424620500212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Doxorubicin (DOX) resistance, which results in a reduced accumulation of DOX in the nucleus and hence decreased DNA damage, is a major challenge for chemotherapy against hepatocellular carcinoma. In this paper, we combined chemotherapy with photodynamic therapy (PDT) to combat DOX-resistant human hepatocellular carcinoma cells. We have prepared the polymeric micelles conjugating with DOX and zinc(II) phthalocyanine (ZnPc) through a pH-responsive hydrazone linker and a glutathione (GSH)-responsive disulfide linker, respectively. The polymeric micelles (DOX-ZnPc-micelles) exhibited a spherical shape with a size of about 98 nm diameter and showed excellent stability in aqueous solution. Due to the self-quenching of the ZnPc inside the micelles, DOX-ZnPc-micelles did not emit fluorescence upon red light irradiation. Drug release experiments verified that DOX and ZnPc could be released under acidic conditions and reducing environments, respectively. A higher concentration of DOX was internalized into DOX-resistant R-HepG2 cells through the delivery of polymeric micelles when compared with the free DOX, hence DOX-ZnPc-micelles exhibited a significant enhancement in anticancer activity. The IC[Formula: see text] value of DOX against R-HepG2 cells was found to be 21 [Formula: see text]M when combined with PDT and it was 5-fold less than that of a single treatment of DOX (102 [Formula: see text]M). The DOX-ZnPc-micelles could induce cell apoptosis and necrosis on R-HepG2 cells by combined therapeutic modalities, while these micelles induced only apoptosis on HepG2 cells. We have demonstrated that utilization of polymeric micelles can significantly enhance the cellular uptake and cytotoxicity of DOX against R-HepG2 cells when compared with free DOX. Moreover, PDT can act as an adjuvant therapeutic modality and combine with chemotherapy to further improve therapeutic efficacy. Overall speaking, DOX-ZnPc-micelles can overcome DOX resistance and induce a synergistic therapeutic effect against DOX-resistant R-HepG2 cells, hence improving the therapeutic efficacy when compared with monotherapy.
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Affiliation(s)
- Di Gao
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
- Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
- Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
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18
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Dharmaratne P, Wong RCH, Wang J, Lo PC, Wang B, Chan BCL, Lau KM, Lau CBS, Fung KP, Ip M, Ng DKP. Synthesis and In Vitro Photodynamic Activity of Cationic Boron Dipyrromethene-Based Photosensitizers against Methicillin-Resistant Staphylococcus aureus. Biomedicines 2020; 8:E140. [PMID: 32485946 PMCID: PMC7344895 DOI: 10.3390/biomedicines8060140] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 01/07/2023] Open
Abstract
A series of cationic boron dipyrromethene (BODIPY) derivatives were synthesized and characterized with various spectroscopic methods. Having the ability to generate singlet oxygen upon irradiation, these compounds could potentially serve as photosensitizers for antimicrobial photodynamic therapy. Of the five BODIPYs being examined, the dicationic aza-BODIPY analogue (compound 5) demonstrated the highest potency against a broad spectrum of clinically relevant methicillin-resistant Staphylococcus aureus (MRSA), including four ATCC-type strains (ATCC 43300, ATCC BAA-42, ATCC BAA-43, and ATCC BAA-44), two strains carrying specific antibiotic resistance mechanisms [-AAC(6')-APH(2") and RN4220/pUL5054], and ten non-duplicate clinical strains from hospital- and community-associated MRSAs of the important clonal types ST239, ST30, and ST59, which have previously been documented to be prevalent in Hong Kong and its neighboring countries. The in vitro anti-MRSA activity of compound 5 was achieved upon irradiation with near-infrared light (>610 nm) with minimal bactericidal concentrations (MBCs) ranging from 12.5 to 25 µM against the whole panel of MRSAs, except the hospital-associated MRSAs for which the MBCs were in the range of 50-100 µM. Compound 5 was significantly (p < 0.05) more potent than methylene blue, which is a clinically approved photosensitizer, indicating that it is a promising antimicrobial agent that is worthy of further investigation.
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Affiliation(s)
- Priyanga Dharmaratne
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (P.D.); (B.W.); (K.-P.F.)
| | - Roy C. H. Wong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong;
| | - Jun Wang
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; (J.W.); (P.-C.L.)
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; (J.W.); (P.-C.L.)
| | - Baiyan Wang
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (P.D.); (B.W.); (K.-P.F.)
| | - Ben C. L. Chan
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (B.C.L.C.); (K.-M.L.); (C.B.S.L.)
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
| | - Kit-Man Lau
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (B.C.L.C.); (K.-M.L.); (C.B.S.L.)
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
| | - Clara B. S. Lau
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (B.C.L.C.); (K.-M.L.); (C.B.S.L.)
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
| | - Kwok-Pui Fung
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong; (P.D.); (B.W.); (K.-P.F.)
- CUHK-Zhejiang University Joint Laboratory on Natural Products and Toxicology Research, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
| | - Margaret Ip
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, N.T., Hong Kong
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen 518057, China
| | - Dennis K. P. Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong;
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19
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Li Y, Wong RCH, Yan X, Ng DKP, Lo PC. Self-Assembled Nanophotosensitizing Systems with Zinc(II) Phthalocyanine-Peptide Conjugates as Building Blocks for Targeted Chemo-Photodynamic Therapy. ACS Appl Bio Mater 2020; 3:5463-5473. [DOI: 10.1021/acsabm.0c00214] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yongxin Li
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong China
- Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
| | - Roy C. H. Wong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Xuehai Yan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Dennis K. P. Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong China
- Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China
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20
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Cho MH, Li Y, Lo PC, Lee H, Choi Y. Fucoidan-Based Theranostic Nanogel for Enhancing Imaging and Photodynamic Therapy of Cancer. Nanomicro Lett 2020; 12:47. [PMID: 34138253 PMCID: PMC7770685 DOI: 10.1007/s40820-020-0384-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 12/27/2019] [Indexed: 05/07/2023]
Abstract
In this study, a fucoidan-based theranostic nanogel (CFN-gel) consisting of a fucoidan backbone, redox-responsive cleavable linker and photosensitizer is developed to achieve activatable near-infrared fluorescence imaging of tumor sites and an enhanced photodynamic therapy (PDT) to induce the complete death of cancer cells. A CFN-gel has nanomolar affinity for P-selectin, which is overexpressed on the surface of tumor neovascular endothelial cells as well as many other cancer cells. Therefore, a CFN-gel can enhance tumor accumulation through P-selectin targeting and the enhanced permeation and retention effect. Moreover, a CFN-gel is non-fluorescent and non-phototoxic upon its systemic administration due to the aggregation-induced self-quenching in its fluorescence and singlet oxygen generation. After internalization into cancer cells and tumor neovascular endothelial cells, its photoactivity is recovered in response to the intracellular redox potential, thereby enabling selective near-infrared fluorescence imaging and an enhanced PDT of tumors. Since a CFN-gel also shows nanomolar affinity for the vascular endothelial growth factor, it also provides a significant anti-tumor effect in the absence of light treatment in vivo. Our study indicates that a fucoidan-based theranostic nanogel is a new theranostic material for imaging and treating cancer with high efficacy and specificity.
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Affiliation(s)
- Mi Hyeon Cho
- Division of Translational Science, Research Institute, National Cancer Center, 323 Ilsan-ro, Goyang, Gyeonggi, 10408, Republic of Korea
| | - Yan Li
- Division of Translational Science, Research Institute, National Cancer Center, 323 Ilsan-ro, Goyang, Gyeonggi, 10408, Republic of Korea
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Hyeri Lee
- Division of Translational Science, Research Institute, National Cancer Center, 323 Ilsan-ro, Goyang, Gyeonggi, 10408, Republic of Korea
| | - Yongdoo Choi
- Division of Translational Science, Research Institute, National Cancer Center, 323 Ilsan-ro, Goyang, Gyeonggi, 10408, Republic of Korea.
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21
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Wong RCH, Ng DKP, Fong WP, Lo PC. Glutathione- and light-controlled generation of singlet oxygen for triggering drug release in mesoporous silica nanoparticles. J Mater Chem B 2020; 8:4460-4468. [DOI: 10.1039/d0tb00636j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An activatable phthalocyanine-based photosensitiser and a singlet-oxygen-triggered doxorubicin releasing system have been incorporated into mesoporous silica nanoparticles, which can release the encapsulated doxorubicin in a controllable manner.
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Affiliation(s)
- Roy C. H. Wong
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Wing-Ping Fong
- School of Life Sciences
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
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22
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Lo PC, Rodríguez-Morgade MS, Pandey RK, Ng DKP, Torres T, Dumoulin F. The unique features and promises of phthalocyanines as advanced photosensitisers for photodynamic therapy of cancer. Chem Soc Rev 2019; 49:1041-1056. [PMID: 31845688 DOI: 10.1039/c9cs00129h] [Citation(s) in RCA: 351] [Impact Index Per Article: 70.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Phthalocyanines exhibit superior photoproperties that make them a surely attractive class of photosensitisers for photodynamic therapy of cancer. Several derivatives are at various phases of clinical trials, and efforts have been put continuously to improve their photodynamic efficacy. To this end, various strategies have been applied to develop advanced phthalocyanines with optimised photoproperties, dual therapeutic actions, tumour-targeting properties and/or specific activation at tumour sites. The advantageous properties and potential of phthalocyanines as advanced photosensitisers for photodynamic therapy of cancer are highlighted in this tutorial review.
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Affiliation(s)
- Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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23
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Wang Q, Yu L, Wong RC, Lo PC. Construction of cathepsin B-responsive fluorescent probe and photosensitizer using a ferrocenyl boron dipyrromethene dark quencher. Eur J Med Chem 2019; 179:828-836. [DOI: 10.1016/j.ejmech.2019.06.082] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 06/11/2019] [Accepted: 06/28/2019] [Indexed: 12/21/2022]
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24
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Wang J, Li Y, Gong Q, Wang H, Hao E, Lo PC, Jiao L. β-AlkenylBODIPY Dyes: Regioselective Synthesis via Oxidative C-H Olefination, Photophysical Properties, and Bioimaging Studies. J Org Chem 2019; 84:5078-5090. [PMID: 30964680 DOI: 10.1021/acs.joc.9b00020] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A series of 2-alkenyl- and 2,6-dialkenylboron dipyrromethene (BODIPY) derivatives were synthesized through Pd(II)-catalyzed regioselective and stereoselective oxidative C-H olefination in one step. The 2-alkenyl BODIPY derivative further reacted with various amines regioselectively at the 5-position through direct oxidative nucleophilic substitution. The photophysical properties of the 2-alkenyl- and 2,6-dialkenyl-substituted BODIPYs were investigated, which showed great potential in fluorescent bioimaging.
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Affiliation(s)
- Jun Wang
- The Key Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science , Anhui Normal University , Wuhu 241000 , China
| | - Yongxin Li
- Department of Biomedical Sciences , City University of Hong Kong , Kowloon , Hong Kong, S.A.R. China
| | - Qingbao Gong
- The Key Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science , Anhui Normal University , Wuhu 241000 , China
| | - Hua Wang
- The Key Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science , Anhui Normal University , Wuhu 241000 , China
| | - Erhong Hao
- The Key Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science , Anhui Normal University , Wuhu 241000 , China
| | - Pui-Chi Lo
- Department of Biomedical Sciences , City University of Hong Kong , Kowloon , Hong Kong, S.A.R. China
| | - Lijuan Jiao
- The Key Laboratory of Functional Molecular Solids, Ministry of Education; School of Chemistry and Materials Science , Anhui Normal University , Wuhu 241000 , China
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25
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Guo X, Wong RCH, Zhou Y, Ng DKP, Lo PC. A novel distyryl boron dipyrromethene with two functional tags for site-specific bioorthogonal photosensitisation towards targeted photodynamic therapy. Chem Commun (Camb) 2019; 55:13518-13521. [DOI: 10.1039/c9cc07460k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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
A sequential “tag-and-click” process for targeted delivery of photosensitisers for photodynamic therapy.
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Affiliation(s)
- Xuejiao Guo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Roy C. H. Wong
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin
- China
| | - Yimin Zhou
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
- Shenzhen Research Institute of City University of Hong Kong
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26
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27
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Yu L, Wang Q, Yeung KW, Fong WP, Lo PC. Cover Feature: A Biotinylated and Endoplasmic Reticulum-Targeted Glutathione-Responsive Zinc(II) Phthalocyanine for Targeted Photodynamic Therapy (Chem. Asian J. 22/2018). Chem Asian J 2018. [DOI: 10.1002/asia.201801304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ligang Yu
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
| | - Qiong Wang
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
| | - Ka-Wing Yeung
- School of Life Sciences; The Chinese University of Hong Kong; Shatin, N. T. Hong Kong
| | - Wing-Ping Fong
- School of Life Sciences; The Chinese University of Hong Kong; Shatin, N. T. Hong Kong
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
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28
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Yu L, Wang Q, Yeung KW, Fong WP, Lo PC. A Biotinylated and Endoplasmic Reticulum-Targeted Glutathione-Responsive Zinc(II) Phthalocyanine for Targeted Photodynamic Therapy. Chem Asian J 2018; 13:3509-3517. [DOI: 10.1002/asia.201800852] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Indexed: 12/14/2022]
Affiliation(s)
- Ligang Yu
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
| | - Qiong Wang
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
| | - Ka-Wing Yeung
- School of Life Sciences; The Chinese University of Hong Kong; Shatin, N. T. Hong Kong
| | - Wing-Ping Fong
- School of Life Sciences; The Chinese University of Hong Kong; Shatin, N. T. Hong Kong
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong
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29
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Gao D, Lo PC. Polymeric micelles encapsulating pH-responsive doxorubicin prodrug and glutathione-activated zinc(II) phthalocyanine for combined chemotherapy and photodynamic therapy. J Control Release 2018; 282:46-61. [DOI: 10.1016/j.jconrel.2018.04.030] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/28/2018] [Accepted: 04/13/2018] [Indexed: 01/08/2023]
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30
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Zhou Y, Cheung YK, Ma C, Zhao S, Gao D, Lo PC, Fong WP, Wong KS, Ng DKP. Endoplasmic Reticulum-Localized Two-Photon-Absorbing Boron Dipyrromethenes as Advanced Photosensitizers for Photodynamic Therapy. J Med Chem 2018; 61:3952-3961. [DOI: 10.1021/acs.jmedchem.7b01907] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Yimin Zhou
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Ying-Kit Cheung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Chao Ma
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Shirui Zhao
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Di Gao
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Wing-Ping Fong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Kam Sing Wong
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Dennis K. P. Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
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31
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Chow SYS, Wong RCH, Zhao S, Lo PC, Ng DKP. Frontispiece: Disulfide-Linked Dendritic Oligomeric Phthalocyanines as Glutathione-Responsive Photosensitizers for Photodynamic Therapy. Chemistry 2018. [DOI: 10.1002/chem.201882265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sun Y. S. Chow
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Roy C. H. Wong
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Shirui Zhao
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Dennis K. P. Ng
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
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32
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Chow SYS, Wong RCH, Zhao S, Lo PC, Ng DKP. Disulfide-Linked Dendritic Oligomeric Phthalocyanines as Glutathione-Responsive Photosensitizers for Photodynamic Therapy. Chemistry 2018; 24:5779-5789. [DOI: 10.1002/chem.201706128] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Indexed: 02/04/2023]
Affiliation(s)
- Sun Y. S. Chow
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Roy C. H. Wong
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Shirui Zhao
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong China
| | - Dennis K. P. Ng
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N.T. Hong Kong China
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33
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Wang Q, Ng DKP, Lo PC. Functional aza-boron dipyrromethenes for subcellular imaging and organelle-specific photodynamic therapy. J Mater Chem B 2018; 6:3285-3296. [DOI: 10.1039/c8tb00593a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A series of aza-BODIPY derivatives which can serve as specific fluorescent probes for the mitochondria and lysosomes of a range of cancer cell lines and photosensitisers acting specifically on these subcellular compartments are reported.
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Affiliation(s)
- Qiong Wang
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
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34
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Zhou Y, Ma C, Gao N, Wang Q, Lo PC, Wong KS, Xu QH, Kinoshita T, Ng DKP. Pyrrolopyrrole aza boron dipyrromethene based two-photon fluorescent probes for subcellular imaging. J Mater Chem B 2018; 6:5570-5581. [DOI: 10.1039/c8tb01832d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A series of two-photon-absorbing pyrrolopyrrole aza boron dipyrromethenes have been prepared which can serve as fluorescent probes for subcellular imaging.
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Affiliation(s)
- Yimin Zhou
- Department of Chemistry
- The Chinese University of Hong Kong
- Hong Kong
- China
| | - Chao Ma
- Department of Physics
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Nengyue Gao
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | - Qiong Wang
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Kam Sing Wong
- Department of Physics
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Qing-Hua Xu
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | - Takumi Kinoshita
- Department of General System Studies
- Graduate School of Arts and Sciences
- The University of Tokyo
- Meguro-ku
- Japan
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Hong Kong
- China
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35
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Wong RCH, Ng DKP, Fong WP, Lo PC. Encapsulating pH-Responsive Doxorubicin-Phthalocyanine Conjugates in Mesoporous Silica Nanoparticles for Combined Photodynamic Therapy and Controlled Chemotherapy. Chemistry 2017; 23:16505-16515. [DOI: 10.1002/chem.201703188] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Roy C. H. Wong
- Department of Chemistry; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Dennis K. P. Ng
- Department of Chemistry; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Wing-Ping Fong
- School of Life Sciences; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P. R. China
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36
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Wong RCH, Ng DKP, Fong WP, Lo PC. Cover Feature: Encapsulating pH-Responsive Doxorubicin-Phthalocyanine Conjugates in Mesoporous Silica Nanoparticles for Combined Photodynamic Therapy and Controlled Chemotherapy (Chem. Eur. J. 65/2017). Chemistry 2017. [DOI: 10.1002/chem.201704058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Roy C. H. Wong
- Department of Chemistry; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Dennis K. P. Ng
- Department of Chemistry; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Wing-Ping Fong
- School of Life Sciences; The Chinese University of Hong Kong, Shatin, N.T.; Hong Kong P. R. China
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P. R. China
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37
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Wong RCH, Chow SYS, Zhao S, Fong WP, Ng DKP, Lo PC. pH-Responsive Dimeric Zinc(II) Phthalocyanine in Mesoporous Silica Nanoparticles as an Activatable Nanophotosensitizing System for Photodynamic Therapy. ACS Appl Mater Interfaces 2017; 9:23487-23496. [PMID: 28661122 DOI: 10.1021/acsami.7b06353] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An acid-cleavable acetal-linked zinc(II) phthalocyanine dimer with an azido terminal group (cPc) was prepared and conjugated to alkyne-modified mesoporous silica nanoparticles via copper(I)-catalyzed alkyne-azide cycloaddition reaction. For comparison, an amine-linked analogue (nPc) was also prepared as a non-acid-cleavable counterpart. These dimeric phthalocyanines were significantly self-quenched due to the close proximity of the phthalocyanine units inside the mesopores, resulting in much weaker fluorescence emission and singlet oxygen generation, both in N,N-dimethylformamide and in phosphate-buffered saline (PBS), compared with the free molecular counterparts. Under acidic conditions in PBS, the cPc-encapsulated nanosystem was activated in terms of fluorescence emission and singlet oxygen production. After internalization into human colon adenocarcinoma HT29 cells, it exhibited much higher intracellular fluorescence and photocytotoxicity compared to the nanosystem entrapped with nPc. The activation of this nanosystem was also demonstrated in tumor-bearing nude mice. The intratumoral fluorescence intensity increased gradually over 24 h, while for the nPc counterpart the fluorescence remained very weak. The results suggest that this nanosystem serves as a promising activatable nanophotosensitizing agent for photodynamic therapy.
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Affiliation(s)
| | | | | | | | | | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China
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38
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Eguchi H, Maeda A, Lo PC, Matsuura R, Esquivel EL, Asada M, Sakai R, Nakahata K, Yamamichi T, Umeda S, Deguchi K, Ueno T, Okuyama H, Miyagawa S. HLA-G1, but Not HLA-G3, Suppresses Human Monocyte/Macrophage-mediated Swine Endothelial Cell Lysis. Transplant Proc 2017; 48:1285-7. [PMID: 27320605 DOI: 10.1016/j.transproceed.2015.10.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 10/03/2015] [Indexed: 11/16/2022]
Abstract
The inhibitory function of HLA-G1, a class Ib molecule, on monocyte/macrophage-mediated cytotoxicity was examined. The expression of inhibitory receptors that interact with HLA-G, immunoglobulin-like transcript 2 (ILT2), ILT4, and KIR2DL4 (CD158d) on in vitro-generated macrophages obtained from peripheral blood mononuclear cells and the phorbol 12-myristate 13-acetate (PMA)-activated THP-1 cells were examined by flow cytometry. cDNAs of HLA-G1, HLA-G3, HLA-E, and human β2-microglobulin were prepared, transfected into pig endothelial cells (PECs), and macrophage- and the THP-1 cell-mediated PEC cytolysis was then assessed. In vitro-generated macrophages expressed not only ILT2 and ILT4 but CD158d as well. The transgenic HLA-G1 on PEC indicated a significant suppression in macrophage-mediated cytotoxicity, which was equivalent to that of transgenic HLA-E. HLA-G1 was clearly expressed on the cell surface of PEC, whereas the levels of HLA-G3 were much lower and remained in the intracellular space. On the other hand, the PMA-activated THP-1 cell was less expressed these inhibitory molecules than in vitro-generated macrophages. Therefore, the HLA-G1 on PECs showed a significant but relatively smaller suppression to THP-1 cell-mediated cytotoxicity compared to in vitro-generated macrophages. These results indicate that by generating HLA-G1, but not HLA-G3, transgenic pigs can protect porcine grafts from monocyte/macrophage-mediated cytotoxicity.
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Affiliation(s)
- H Eguchi
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
| | - A Maeda
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - P C Lo
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - R Matsuura
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - E L Esquivel
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - M Asada
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - R Sakai
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - K Nakahata
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - T Yamamichi
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - S Umeda
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - K Deguchi
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - T Ueno
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - H Okuyama
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - S Miyagawa
- Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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39
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Chow SYS, Zhao S, Lo PC, Ng DKP. A cell-selective glutathione-responsive tris(phthalocyanine) as a smart photosensitiser for targeted photodynamic therapy. Dalton Trans 2017; 46:11223-11229. [DOI: 10.1039/c7dt02086d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The in vitro photodynamic activity of a bifunctional tris(phthalocyanine)-based photosensitiser has been examined.
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Affiliation(s)
- Sun Y. S. Chow
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Shirui Zhao
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
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40
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Jiang XJ, Lau JTF, Wang Q, Ng DKP, Lo PC. pH- and Thiol-Responsive BODIPY-Based Photosensitizers for Targeted Photodynamic Therapy. Chemistry 2016; 22:8273-81. [DOI: 10.1002/chem.201600452] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Xiong-Jie Jiang
- Department of Chemistry; The Chinese University of Hong Kong; Shatin, N.T.; Hong Kong S.A.R. China
| | - Janet T. F. Lau
- Department of Chemistry; The Chinese University of Hong Kong; Shatin, N.T.; Hong Kong S.A.R. China
| | - Qiong Wang
- Department of Chemistry; The Chinese University of Hong Kong; Shatin, N.T.; Hong Kong S.A.R. China
| | - Dennis K. P. Ng
- Department of Chemistry; The Chinese University of Hong Kong; Shatin, N.T.; Hong Kong S.A.R. China
| | - Pui-Chi Lo
- Department of Biomedical Sciences; City University of Hong Kong; Tat Chee Avenue Kowloon Hong Kong S.A.R. China
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41
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Shi WJ, Lo PC, Zhao S, Wong RCH, Wang Q, Fong WP, Ng DKP. A biotin-conjugated glutathione-responsive FRET-based fluorescent probe with a ferrocenyl BODIPY as the dark quencher. Dalton Trans 2016; 45:17798-17806. [DOI: 10.1039/c6dt03141b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A ferrocenyl BODIPY quencher has been developed and employed to construct the captioned probe, of which its behaviour in phosphate buffered saline and inside cancer cells has been examined.
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Affiliation(s)
- Wen-Jing Shi
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
- School of Chemistry and Chemical Engineering
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Shirui Zhao
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Roy C. H. Wong
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Qiong Wang
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Wing-Ping Fong
- School of Life Sciences
- The Chinese University of Hong Kong
- Shatin, N.T
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- Shatin, N.T
- China
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42
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Abstract
A novel self-quenched phthalocyanine tetramer has been prepared which can be activated in acidic environments, resulting in enhanced fluorescence emission and singlet oxygen production.
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Affiliation(s)
- Sun Y. S. Chow
- Department of Chemistry
- The Chinese University of Hong Kong
- China
| | - Pui-Chi Lo
- Department of Biomedical Sciences
- City University of Hong Kong
- Kowloon
- China
| | - Dennis K. P. Ng
- Department of Chemistry
- The Chinese University of Hong Kong
- China
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Yeung HY, Lo PC, Ng DKP, Fong WP. Anti-tumor immunity of BAM-SiPc-mediated vascular photodynamic therapy in a BALB/c mouse model. Cell Mol Immunol 2015; 14:223-234. [PMID: 26388236 DOI: 10.1038/cmi.2015.84] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 07/15/2015] [Accepted: 08/10/2015] [Indexed: 12/22/2022] Open
Abstract
In recent decades, accumulating evidence from both animal and clinical studies has suggested that a sufficiently activated immune system may strongly augment various types of cancer treatment, including photodynamic therapy (PDT). Through the generation of reactive oxygen species, PDT eradicates tumors by triggering localized tumor damage and inducing anti-tumor immunity. As the major component of anti-tumor immunity, the involvement of a cell-mediated immune response in PDT has been well investigated in the past decade, whereas the role of humoral immunity has remained relatively unexplored. In the present investigation, using the photosensitizer BAM-SiPc and the CT26 tumor-bearing BALB/c mouse model, it was demonstrated that both cell-mediated and humoral adaptive immune components could be involved in PDT. With a vascular PDT (VPDT) regimen, BAM-SiPc could eradicate the tumors of ∼70% of tumor-bearing mice and trigger an anti-tumor immune response that could last for more than 1 year. An elevation of Th2 cytokines was detected ex vivo after VPDT, indicating the potential involvement of a humoral response. An analysis of serum from the VPDT-cured mice also revealed elevated levels of tumor-specific antibodies. Moreover, this serum could effectively hinder tumor growth and protect the mice against further re-challenge in a T-cell-dependent manner. Taken together, these results show that the humoral components induced after BAM-SiPc-VPDT could assist the development of anti-tumor immunity.
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Affiliation(s)
- Hing-Yuen Yeung
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department of Biomedical Sciences, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Wing-Ping Fong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
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Chan CMH, Lo PC, Yeung SL, Ng DKP, Fong WP. Photodynamic activity of a glucoconjugated silicon(IV) phthalocyanine on human colon adenocarcinoma. Cancer Biol Ther 2014; 10:126-34. [DOI: 10.4161/cbt.10.2.11946] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Ke MR, Eastel JM, Ngai KLK, Cheung YY, Chan PKS, Hui M, Ng DKP, Lo PC. Photodynamic inactivation of bacteria and viruses using two monosubstituted zinc(II) phthalocyanines. Eur J Med Chem 2014; 84:278-83. [PMID: 25036788 DOI: 10.1016/j.ejmech.2014.07.022] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 06/10/2014] [Accepted: 07/06/2014] [Indexed: 10/25/2022]
Abstract
A zinc(II) phthalocyanine substituted with a triamino moiety and its tri-N-methylated analogue have been prepared and characterized with various spectroscopic methods. Both compounds remain non-aggregated in N,N-dimethylformamide and in water containing 0.05% Cremophor EL (v/v), and can generate singlet oxygen effectively. The photodynamic activities of these compounds have been examined against a range of bacterial strains, including the Gram-positive methicillin-sensitive Staphylococcus aureus ATCC 25923 and methicillin-resistant Staphylococcus aureus ATCC BAA-43, and the Gram-negative Escherichia coli ATCC 35218 and Pseudomonas aeruginosa ATCC 27853. Both photosensitizers are highly cytotoxic, particularly for the two Gram-positive strains, for which as low as 5 nM of dye is required to induce a 4-log reduction of their viability. The tri-N-methylated derivative has also been shown to be able to effectively inhibit the growth of a series of clinical strains of Staphylococcus aureus and Escherichia coli, and biofilms of methicillin-resistant Staphylococcus aureus ATCC 67928 and ATCC 68507, and Staphylococcus epidermidis ATCC 35984. In addition, the photodynamic inactivation of a range of viruses using these two compounds has also been investigated. Both compounds are highly photocytotoxic against the enveloped viruses influenza A virus (H1N1) and herpes simplex virus type 1 (HSV1), but exhibit no significant cytotoxicity toward the non-enveloped viruses adenovirus type 3 (Ad3) and coxsackievirus (Cox B1).
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Affiliation(s)
- Mei-Rong Ke
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Jennifer Mary Eastel
- Department of Microbiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Karry L K Ngai
- Department of Microbiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Yuk-Yam Cheung
- Department of Microbiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Paul K S Chan
- Department of Microbiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Mamie Hui
- Department of Microbiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
| | - Dennis K P Ng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
| | - Pui-Chi Lo
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
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Abstract
An unsymmetrical bisferrocenyl silicon(IV) phthalocyanine has been prepared in which the disulfide and hydrazone linkers can be cleaved by dithiothreitol and acid, respectively. The separation of the ferrocenyl quenchers and the phthalocyanine core greatly enhances the fluorescence emission, singlet oxygen production, intracellular fluorescence intensity, and in vitro photocytotoxicity. The results have been compared with those for the two symmetrical analogues which contain either the disulfide or hydrazone linker and therefore can only be activated by one of these stimuli. For the dual activatable agent, the greatest enhancement can be attained under a slightly acidic environment (pH = 4.5-6.8) and in the presence of dithiothreitol (in millimolar range), which can roughly mimic the acidic and reducing environment of tumor tissues. This compound can also be activated in tumor-bearing nude mice. It exhibits an increase in fluorescence intensity in the tumor over the first 10 h after intratumoral injection and can effectively inhibit the growth of tumor upon illumination.
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Affiliation(s)
- Janet T F Lau
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, N.T., Hong Kong, China
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Ke MR, Eastel JM, Ngai KLK, Cheung YY, Chan PKS, Hui M, Ng DKP, Lo PC. Oligolysine-conjugated zinc(II) phthalocyanines as efficient photosensitizers for antimicrobial photodynamic therapy. Chem Asian J 2014; 9:1868-75. [PMID: 24799418 DOI: 10.1002/asia.201402025] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Indexed: 11/06/2022]
Abstract
A series of zinc(II) phthalocyanines conjugated with an oligolysine chain (n=2, 4, and 8) were synthesized and characterized by using various spectroscopic methods. As shown by using UV/Vis and fluorescence spectroscopic methods, these compounds were nonaggregated in N,N-dimethylformamide, and gave a weak fluorescence emission and high singlet oxygen quantum yield (Φ(Δ) =0.86-0.89) as a result of their di-α-substitution. They became slightly aggregated in water with 0.05 % Cremophor EL, but they could still generate singlet oxygen effectively. The antimicrobial photodynamic activities of these compounds were then examined against various bacterial strains, including the Gram-positive methicillin-sensitive Staphylococcus aureus ATCC 25923 and methicillin-resistant Staphylococcus aureus ATCC BAA-43, and the Gram-negative Escherichia coli ATCC 35218 and Pseudomonas aeruginosa ATCC 27853. Generally, the dyes were much more potent toward the Gram-positive bacteria. Only 15 to 90 nM of these photosensitizers was required to induce a 4 log reduction in the cell viability of the strains. For Escherichia coli, the photocytotoxicity increased with the length of the oligolysine chain. The octalysine derivative showed the highest potency with a 4 log reduction concentration of 0.8 μM. Pseudomonas aeruginosa was most resistant to the photodynamic treatment. The potency of the tetralysine derivative toward a series of clinical strains of Staphylococcus aureus was also examined and found to be comparable with that toward the nonclinical counterparts. Moreover, the efficacy of these compounds in photodynamic inactivation of viruses was also examined. They were highly photocytotoxic against the enveloped viruses influenza A virus (H1N1) and herpes simplex virus type 1 (HSV1), but exhibited no significant cytotoxicity against the nonenveloped viruses adenovirus type 3 (Ad3) or coxsackievirus (Cox B1). The octalysine derivative also showed the highest potency with an IC(50) value of 0.05 nM for the two enveloped viruses.
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Affiliation(s)
- Mei-Rong Ke
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong (China), Fax: (+852) 2603-5057
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Ke MR, Ng DKP, Lo PC. Synthesis and In Vitro Photodynamic Activities of an Integrin-Targeting cRGD-Conjugated Zinc(II) Phthalocyanine. Chem Asian J 2013; 9:554-61. [DOI: 10.1002/asia.201301166] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 09/20/2013] [Indexed: 11/07/2022]
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Ke MR, Yeung SL, Ng DKP, Fong WP, Lo PC. Preparation and in Vitro Photodynamic Activities of Folate-Conjugated Distyryl Boron Dipyrromethene Based Photosensitizers. J Med Chem 2013; 56:8475-83. [DOI: 10.1021/jm4009168] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mei-Rong Ke
- Department
of Chemistry and ‡School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Sin-Lui Yeung
- Department
of Chemistry and ‡School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Dennis K. P. Ng
- Department
of Chemistry and ‡School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Wing-Ping Fong
- Department
of Chemistry and ‡School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Pui-Chi Lo
- Department
of Chemistry and ‡School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
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Shi WJ, Menting R, Ermilov EA, Lo PC, Röder B, Ng DKP. Formation and photoinduced processes of the host–guest complexes of a β-cyclodextrin-conjugated aza-BODIPY and tetrasulfonated porphyrins. Chem Commun (Camb) 2013; 49:5277-9. [DOI: 10.1039/c3cc00095h] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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