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de Paula B, Kieran R, Koh SSY, Crocamo S, Abdelhay E, Muñoz-Espín D. Targeting Senescence as a Therapeutic Opportunity for Triple-Negative Breast Cancer. Mol Cancer Ther 2023; 22:583-598. [PMID: 36752780 PMCID: PMC10157365 DOI: 10.1158/1535-7163.mct-22-0643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/21/2022] [Accepted: 01/19/2023] [Indexed: 02/09/2023]
Abstract
Triple-negative breast cancer (TNBC) is associated with an elevated risk of recurrence and poor prognosis. Historically, only chemotherapy was available as systemic treatment, but immunotherapy and targeted therapies currently offer prolonged benefits. TNBC is a group of diseases with heterogeneous treatment sensitivity, and resistance is inevitable and early for a large proportion of the intrinsic subtypes. Although senescence induction by anticancer therapy offers an immediate favorable clinical outcome once the rate of tumor progression reduces, these cells are commonly dysfunctional and metabolically active, culminating in treatment-resistant repopulation associated with worse prognosis. This heterogeneous response can also occur without therapeutic pressure in response to damage or oncogenic stress, playing a relevant role in the carcinogenesis. Remarkably, there is preclinical and exploratory clinical evidence to support a relevant role of senescence in treatment resistance. Therefore, targeting senescent cells has been a scientific effort in many malignant tumors using a variety of targets and strategies, including increasing proapoptotic and decreasing antiapoptotic stimuli. Despite promising results, there are some challenges to applying this technology, including the best schedule of combination, assessment of senescence, specific vulnerabilities, and the best clinical scenarios. This review provides an overview of senescence in TNBC with a focus on future-proofing senotherapy strategies.
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Affiliation(s)
- Bruno de Paula
- Breast Cancer Research Unit, Instituto Nacional de Cancer, Rio de Janeiro, Brazil
| | - Rosalind Kieran
- Early Cancer Institute, Department of Oncology, Cambridge University Hospitals Foundation Trust, Cambridge, United Kingdom
| | - Samantha Shui Yuan Koh
- Department of Medicine, Cambridge University Hospitals Foundation Trust, Cambridge, United Kingdom
| | - Susanne Crocamo
- Breast Cancer Research Unit, Instituto Nacional de Cancer, Rio de Janeiro, Brazil
| | | | - Daniel Muñoz-Espín
- Early Cancer Institute, Department of Oncology, Cambridge University Hospitals Foundation Trust, Cambridge, United Kingdom
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2
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Gao S, Zhao L, Fan Z, Kodibagkar VD, Liu L, Wang H, Xu H, Tu M, Hu B, Cao C, Zhang Z, Yu JX. In Situ Generated Novel 1H MRI Reporter for β-Galactosidase Activity Detection and Visualization in Living Tumor Cells. Front Chem 2021; 9:709581. [PMID: 34336792 PMCID: PMC8321238 DOI: 10.3389/fchem.2021.709581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 05/14/2021] [Accepted: 06/16/2021] [Indexed: 12/24/2022] Open
Abstract
For wide applications of the lacZ gene in cellular/molecular biology, small animal investigations, and clinical assessments, the improvement of noninvasive imaging approaches to precisely assay gene expression has garnered much attention. In this study, we investigate a novel molecular platform in which alizarin 2-O-β-d-galactopyranoside AZ-1 acts as a lacZ gene/β-gal responsive 1H-MRI probe to induce significant 1H-MRI contrast changes in relaxation times T 1 and T 2 in situ as a concerted effect for the discovery of β-gal activity with the exposure of Fe3+. We also demonstrate the capability of this strategy for detecting β-gal activity with lacZ-transfected human MCF7 breast and PC3 prostate cancer cells by reaction-enhanced 1H-MRI T 1 and T 2 relaxation mapping.
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Affiliation(s)
- Shuo Gao
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Lei Zhao
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Zhiqiang Fan
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Vikram D. Kodibagkar
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States
| | - Li Liu
- Department of Radiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, United States
| | - Hanqin Wang
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Hong Xu
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Mingli Tu
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Bifu Hu
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Chuanbin Cao
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Zhenjian Zhang
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
| | - Jian-Xin Yu
- Center of Translational Medicine, Fifth School of Medicine/Suizhou Central Hospital, Hubei University of Medicine, Suizhou, China
- Biomedical Research Institute, Hubei University of Medicine, Shiyan, China
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3
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Lozano-Torres B, Blandez JF, Sancenón F, Martínez-Máñez R. Chromo-fluorogenic probes for β-galactosidase detection. Anal Bioanal Chem 2021; 413:2361-88. [PMID: 33606064 DOI: 10.1007/s00216-020-03111-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 12/02/2020] [Accepted: 12/04/2020] [Indexed: 02/07/2023]
Abstract
β-Galactosidase (β-Gal) is a widely used enzyme as a reporter gene in the field of molecular biology which hydrolyzes the β-galactosides into monosaccharides. β-Gal is an essential enzyme in humans and its deficiency or its overexpression results in several rare diseases. Cellular senescence is probably one of the most relevant physiological disorders that involve β-Gal enzyme. In this review, we assess the progress made to date in the design of molecular-based probes for the detection of β-Gal both in vitro and in vivo. Most of the reported molecular probes for the detection of β-Gal consist of a galactopyranoside residue attached to a signalling unit through glycosidic bonds. The β-Gal-induced hydrolysis of the glycosidic bonds released the signalling unit with remarkable changes in color and/or emission. Additional examples based on other approaches are also described. The wide applicability of these probes for the rapid and in situ detection of de-regulation β-Gal-related diseases has boosted the research in this fertile field.
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Abstract
The ability to detect, identify and quantify bacteria is crucial in clinical diagnostics, environmental testing, food security settings and in microbiology research. Recently, the threat of multidrug-resistant bacterial pathogens pushed the global scientific community to develop fast, reliable, specific and affordable methods to detect bacterial species. The use of synthetically modified enzyme substrates is a convenient approach to detect bacteria in a specific, economic and rapid manner. The method is based on the use of specific enzyme substrates for a given bacterial marker enzyme, conjugated to a signalogenic moiety. Following enzymatic reaction, the signalophor is released from the synthetic substrate, generating a specific and measurable signal. Several types of signalophors have been described and are defined by the type of signal they generate, such as chromogenic, fluorogenic, luminogenic, electrogenic and redox. Signalophors are further subdivided into groups based on their solubility in water, which is key in defining their application on solid or liquid media for bacterial culturing. This comprehensive review describes synthetic enzyme substrates and their applications for bacterial detection, showing their mechanism of action and their synthetic routes.
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Affiliation(s)
| | | | - Urs Spitz
- Biosynth Carbosynth, Axis House, High Street, Compton, Berkshire RG20 6NL, UK; (L.P.); (T.S.)
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5
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Burton M, Perry JD, Stanforth SP, Turner HJ. The synthesis of novel chromogenic enzyme substrates for detection of bacterial glycosidases and their applications in diagnostic microbiology. Bioorg Med Chem 2018; 26:4841-4849. [PMID: 30170924 DOI: 10.1016/j.bmc.2018.08.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 05/18/2018] [Revised: 08/01/2018] [Accepted: 08/16/2018] [Indexed: 10/28/2022]
Abstract
The preparation and evaluation of chromogenic substrates for detecting bacterial glycosidase enzymes is reported. These substrates are monoglycoside derivatives of the metal chelators catechol, 2,3-dihydroxynaphthalene (DHN) and 6,7-dibromo-2,3-dihydroxynaphthalene (6,7-dibromo-DHN). When hydrolysed by appropriate bacterial enzymes these substrates produced coloured chelates in the presence of ammonium iron(III) citrate, thus enabling bacterial detection. A β-d-riboside of DHN and a β-d-glucuronide derivative of 6,7-dibromo-DHN were particularly effective for the detection of S. aureus and E. coli respectively.
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Affiliation(s)
- Michael Burton
- Glycosynth Ltd, 14 Craven Court, Winwick Quay, Warrington, Cheshire WA2 8QU, UK
| | - John D Perry
- Department of Microbiology, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
| | - Stephen P Stanforth
- Department of Applied Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Hayley J Turner
- Glycosynth Ltd, 14 Craven Court, Winwick Quay, Warrington, Cheshire WA2 8QU, UK.
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Cellier M, James AL, Orenga S, Perry JD, Rasul AK, Stanforth SP. Detection of l-alanylaminopeptidase activity in microorganisms using chromogenic self-immolative enzyme substrates. Bioorg Med Chem Lett 2017; 27:2102-2106. [PMID: 28389152 DOI: 10.1016/j.bmcl.2017.03.080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 03/23/2017] [Accepted: 03/25/2017] [Indexed: 11/19/2022]
Abstract
Three potential chromogenic enzymatic probes, each possessing a self-immolative spacer unit, were synthesised for the purpose of detecting l-alanylaminopeptidase activity in microorganisms. An Alizarin-based probe was the most effective, allowing several species to generate strongly coloured colonies in the presence of metal ions.
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Affiliation(s)
- Marie Cellier
- Research & Development Microbiology, bioMérieux SA, 3 route de Port Michaud, 38 390 La-Balme-les-Grottes, France
| | - Arthur L James
- Department of Applied Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Sylvain Orenga
- Research & Development Microbiology, bioMérieux SA, 3 route de Port Michaud, 38 390 La-Balme-les-Grottes, France
| | - John D Perry
- Department of Microbiology, Freeman Hospital, Newcastle upon Tyne NE7 7DN, UK
| | - Ari K Rasul
- Department of Applied Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Stephen P Stanforth
- Department of Applied Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.
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Zhang C, Wang D, Zhang L, Guo JF, Ren AM. Theoretical investigation and design of two-photon fluorescent probes for visualizing β-galactosidase activity in living cells. RSC Adv 2016. [DOI: 10.1039/c6ra11712k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The two-photon fluorescent probes show dual signal for β-gal bio-imaging.
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Affiliation(s)
- Chun Zhang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
| | - Dan Wang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
| | - Li Zhang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
| | - Jing-Fu Guo
- School of Physics
- Northeast Normal University
- Changchun 130021
- China
| | - Ai-Min Ren
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- China
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8
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Na G, Kim S, Kwon O, Rhee M. Development of selective and differential medium for Shigella sonnei using three carbohydrates (lactose, sorbitol, and xylose) and X-Gal. J Microbiol Methods 2015; 115:34-41. [DOI: 10.1016/j.mimet.2015.05.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 05/19/2015] [Accepted: 05/19/2015] [Indexed: 10/23/2022]
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9
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Dang J, Liu H, Yang X, Zhang Y, Xie Y, Li Y, Pu J, Liao J, Yuan Y, Liao F. Chromogenic substrate from 4-nitro-1-naphthol for hydrolytic enzyme of neutral or slightly acidic optimum pH: 4-Nitro-1-naphthyl-β-d-galactopyranoside as an example. Bioorg Med Chem Lett 2013; 23:646-9. [DOI: 10.1016/j.bmcl.2012.11.120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 11/28/2012] [Accepted: 11/30/2012] [Indexed: 11/16/2022]
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Abstract
There is increasing interest in the development of reporter agents to reveal enzyme activity in vivo using small animal imaging. We have previously demonstrated the feasibility of detecting lacZ gene activity using the commercially available 3,4-cyclohexenoesculetin-β-D-galactopyranoside (S-Gal™) as a 1H MRI reporter. Specifically, β-galactosidase (β-gal) releases the aglycone, which forms an MR contrast-inducing paramagnetic precipitate in the presence of Fe3+. Contrast was primarily T2-weighted signal loss, but T1 effects were also observed. Since T1-contrast generally provides signal enhancement as opposed to loss, it appeared attractive to explore whether analogues could be generated with enhanced characteristics. We now report the design and successful synthesis of novel analogues together with characterization of 1H MRI contrast based on both T1 and T2 response to β-gal activity in vitro for the lead agent.
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Affiliation(s)
- Jian-Xin Yu
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9058, USA
| | - Praveen K. Gulaka
- Joint Program in Biomedical Engineering, The University of Texas at Arlington and The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9058, USA
| | - Li Liu
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9058, USA
| | - Vikram D. Kodibagkar
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9058, USA
| | - Ralph P. Mason
- Department of Radiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9058, USA
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11
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Liu L, Mason RP. Imaging beta-galactosidase activity in human tumor xenografts and transgenic mice using a chemiluminescent substrate. PLoS One 2010; 5:e12024. [PMID: 20700459 PMCID: PMC2917367 DOI: 10.1371/journal.pone.0012024] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Accepted: 06/29/2010] [Indexed: 01/04/2023] Open
Abstract
Background Detection of enzyme activity or transgene expression offers potential insight into developmental biology, disease progression, and potentially personalized medicine. Historically, the lacZ gene encoding the enzyme β-galactosidase has been the most common reporter gene and many chromogenic and fluorogenic substrates are well established, but limited to histology or in vitro assays. We now present a novel approach for in vivo detection of β-galactosidase using optical imaging to detect light emission following administration of the chemiluminescent 1,2-dioxetane substrate Galacto-Light PlusTM. Methodology and Principal Findings B-gal activity was visualized in stably transfected human MCF7-lacZ tumors growing in mice. LacZ tumors were identified versus contralateral wild type tumors as controls, based on two- to tenfold greater light emission following direct intra tumoral or intravenous administration of reporter substrate. The 1,2-dioxetane substrate is commercially available as a kit for microplate-based assays for β-gal detection, and we have adapted it for in vivo application. Typically, 100 µl substrate mixture was administered intravenously and light emission was detected from the lacZ tumor immediately with gradual decrease over the next 20 mins. Imaging was also undertaken in transgenic ROSA26 mice following subcutaneous or intravenous injection of substrate mixture. Conclusion and Significance Light emission was detectable using standard instrumentation designed for more traditional bioluminescent imaging. Use of 1,2-dioxetane substrates to detect enzyme activity offers a new paradigm for non-invasive biochemistry in vivo.
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Affiliation(s)
- Li Liu
- Department of Radiology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Ralph P. Mason
- Department of Radiology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
- * E-mail:
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12
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Orenga S, James AL, Manafi M, Perry JD, Pincus DH. Enzymatic substrates in microbiology. J Microbiol Methods 2009; 79:139-55. [PMID: 19679151 DOI: 10.1016/j.mimet.2009.08.001] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2009] [Revised: 07/24/2009] [Accepted: 08/03/2009] [Indexed: 11/15/2022]
Abstract
Enzymatic substrates are powerful tools in biochemistry. They are widely used in microbiology to study metabolic pathways, to monitor metabolism and to detect, enumerate and identify microorganisms. Synthetic enzymatic substrates have been customized for various microbial assays, to detect an expanding range of both new enzymatic activities and target microorganisms. Recent developments in synthetic enzymatic substrates with new spectral, chemical and biochemical properties allow improved detection, enumeration and identification of food-borne microorganisms, clinical pathogens and multi-resistant bacteria in various sample types. In the past 20 years, the range of synthetic enzymatic substrates used in microbiology has been markedly extended supporting the development of new multi-test systems (e.g., Microscan, Vitek 2, Phoenix) and chromogenic culture media. The use of such substrates enables an improvement in time to detection and specificity over conventional tests that employ natural substrates. In the era of intense developments in molecular biology, phenotypic tests involving enzymatic substrates remain useful to analyse both simple and complex samples. Such tests are applicable to diagnostic and research laboratories all over the world.
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Affiliation(s)
- Sylvain Orenga
- Research & Development Microbiology, bioMérieux, 3 route de Port Michaud, La Balme-les-Grottes, France.
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13
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Yu JX, Kodibagkar VD, Liu L, Mason RP. A 19F-NMR approach using reporter molecule pairs to assess beta-galactosidase in human xenograft tumors in vivo. NMR Biomed 2008; 21:704-12. [PMID: 18288788 PMCID: PMC3044929 DOI: 10.1002/nbm.1244] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [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] [Indexed: 05/15/2023]
Abstract
Gene therapy has emerged as a promising strategy for treatment of various diseases. However, widespread implementation is hampered by difficulties in assessing the success of transfection in the target tissue and the longevity of gene expression. Thus, there is increasing interest in the development of non-invasive in vivo reporter techniques to assay gene expression. We recently demonstrated the ability to detect beta-galactosidase activity in stably transfected human prostate tumor xenografts in mice in vivo using 19F NMR. We now extend the studies to human MCF7 breast cancer cells growing as xenografts in nude mice. Moreover, by using two spectrally resolved reporters (o-fluoro-p-nitrophenyl-beta-D-galactopyranoside and an isomer), two tumors could be interrogated simultaneously revealing lacZ transgene activity in a stably transfected tumor versus no activity in a wild-type tumor. Most significantly, hydrolytic activity observed by 19F NMR corresponded to differential activity in lacZ-expressing tumors.
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Affiliation(s)
- Jian-Xin Yu
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9058, USA
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Abstract
Since 1990, a wide range of chromogenic culture media has been made commercially available providing useful tools for diagnostic clinical microbiology. By the inclusion of chromogenic enzyme substrates targeting microbial enzymes, such media are able to target pathogens with high specificity. Examples of target pathogens include Staphylococcus aureus, Streptococcus agalactiae, Salmonella spp. and Candida spp. The inclusion of multiple chromogenic substrates into culture media facilitates the differentiation of polymicrobial cultures, thus allowing for the development of improved media for diagnosis of urinary tract infections and media for the enhanced discrimination of yeasts. The purpose of this review is to provide some insight into how such media work and appraise their utility in routine clinical diagnostics, in comparison with conventional media.
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Affiliation(s)
- J D Perry
- Microbiology Department, Freeman Hospital, Newcastle upon Tyne, UK.
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15
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Abstract
AIMS To evaluate three previously unreported substrates for the detection of beta-glucosidase activity in clinically relevant bacteria and to compare their performance with a range of known substrates in an agar medium. METHODS AND RESULTS The performance of 11 chromogenic beta-glucosidase substrates was compared using 109 Enterobacteriaceae strains, 40 enterococci and 20 strains of Listeria spp. Three previously unreported beta-glucosides were tested including derivatives of alizarin, 3',4'-dihydroxyflavone and 3-hydroxyflavone. These were compared with esculin and beta-glucoside derivatives of 3,4-cyclohexenoesculetin, 8-hydroxyquinoline and five indoxylics. All substrates yielded coloured precipitates upon hydrolysis in agar. Alizarin-beta-D-glucoside was the most sensitive substrate tested and detected beta-glucosidase activity in 72% of Enterobacteriaceae strains and all enterococci and Listeria spp. The two flavone derivatives showed poor sensitivity with Gram-negative bacteria but excellent sensitivity with enterococci and Listeria spp. CONCLUSIONS Alizarin-beta-d-glucoside is a highly sensitive substrate for detection of bacterial beta-glucosidase and compares favourably with existing substrates. beta-glucosides of 3',4'-dihydroxyflavone and 3-hydroxyflavone are effective substrates for the detection of beta-glucosidase in enterococci and Listeria spp. SIGNIFICANCE AND IMPACT OF THE STUDY The data presented allow for informed decisions to be made regarding the optimal choice of beta-glucosidase substrate for detection of pathogenic and/or indicator bacteria.
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Affiliation(s)
- J D Perry
- Department of Microbiology, Freeman Hospital, Newcastle upon Tyne, UK.
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16
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Abstract
The bacterial lacZ gene encoding for beta-galactosidase (beta-gal) is a common reporter gene used in transgenic mice. Nonetheless, the absence of fluorigenic substrates usable in live animals greatly hampered the non-invasive follow-up of this reporter gene expression. We used far-red fluorescence for imaging beta-Gal expression in live cells in vitro or in vivo. The 9H-(1,3-dichloro-9,9-dimethylacridin- 2-one-7-yl) beta-D-galactopyranoside substrate was used to monitor beta-Gal expression as a reporter of tumor growth, or of the physiological levels of an endogenous gene or of gene transfer in lung. A quantitative evaluation of this method as well as a comparison of its sensitivity with Firefly Luciferase-based bioluminescence was also performed. In vivo measurements showed that 10(3) beta-Gal tumor cells located under the skin were detectable. In deeper organs like lung, as little as 5 ng of beta-Gal or Luciferase enzymes per mg of proteins were measured, confirming that both techniques reached similar sensibilities. Nonetheless, quantitative comparison of beta-Gal levels measured with far-red imaging or with a standardized enzymatic evaluation after killing revealed that the 2D-fluorescent reflectance imaging method is submitted to a color-dependent disparity of the organs and cannot supply quantitative measurements but that a simple correction can be applied.
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Affiliation(s)
- V Josserand
- INSERM U823, Institut Albert Bonniot, La Tronche Cedex, France
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17
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Kamiya M, Kobayashi H, Hama Y, Koyama Y, Bernardo M, Nagano T, Choyke PL, Urano Y. An enzymatically activated fluorescence probe for targeted tumor imaging. J Am Chem Soc 2007; 129:3918-29. [PMID: 17352471 PMCID: PMC2555972 DOI: 10.1021/ja067710a] [Citation(s) in RCA: 139] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Beta-galactosidase is a widely used reporter enzyme, but although several substrates are available for in vitro detection, its application for in vivo optical imaging remains a challenge. To obtain a probe suitable for in vivo use, we modified our previously developed activatable fluorescence probe, TG-betaGal (J. Am. Chem. Soc. 2005, 127, 4888-4894), on the basis of photochemical and photophysical experiments. The new probe, AM-TG-betaGal, provides a dramatic fluorescence enhancement upon reaction with beta-galactosidase, and further hydrolysis of the ester moiety by ubiquitous intracellular esterases affords a hydrophilic product that is well retained within the cells without loss of fluorescence. We used a mouse tumor model to assess the practical utility of AM-TG-betaGal, after confirming that tumors in the model could be labeled with an avidin-beta-galactosidase conjugate. This conjugate was administered to the mice in vivo, followed by AM-TG-betaGal, and subsequent ex vivo fluorescence imaging clearly visualized intraperitoneal tumors as small as 200 microm. This strategy has potential clinical application, for example, in video-assisted laparoscopic tumor resection.
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Affiliation(s)
- Mako Kamiya
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | - Hisataka Kobayashi
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bldg. 10, Rm. 1B40, 10 Center Dr., Bethesda, MD 20892-1088
- * To whom correspondence should be addressed. E-mail: or
| | - Yukihiro Hama
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bldg. 10, Rm. 1B40, 10 Center Dr., Bethesda, MD 20892-1088
| | - Yoshinori Koyama
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bldg. 10, Rm. 1B40, 10 Center Dr., Bethesda, MD 20892-1088
| | - Marcelino Bernardo
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bldg. 10, Rm. 1B40, 10 Center Dr., Bethesda, MD 20892-1088
| | - Tetsuo Nagano
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | - Peter L. Choyke
- Molecular Imaging Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bldg. 10, Rm. 1B40, 10 Center Dr., Bethesda, MD 20892-1088
| | - Yasuteru Urano
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
- * To whom correspondence should be addressed. E-mail: or
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18
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Liu L, Kodibagkar VD, Yu JX, Mason RP. 19
F‐NMR detection of
lacZ
gene expression
via
the enzymic hydrolysis of 2‐fluoro‐4‐nitrophenyl β‐D‐galactopyranoside
in vivo
in PC3 prostate tumor xenografts in the mouse
1. FASEB J 2007; 21:2014-9. [PMID: 17351127 DOI: 10.1096/fj.06-7366lsf] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Gene therapy shows promise for treating prostate cancer and has been evaluated in several clinical trials. A major challenge that remains is to establish a method for verifying transgene activity in situ. The lacZ gene encoding beta-galactosidase historically has been the most popular reporter gene for molecular biology. We have designed a 19F NMR approach to reveal lacZ gene expression by assessing beta-galactosidase (beta-gal) activity in vivo. The substrate 2-fluoro-4-nitrophenyl beta-D-galactopyranoside (OFPNPG) is readily hydrolyzed by beta-gal with a corresponding decrease in the 19F-NMR signal from OFPNPG and the appearance of a new signal shifted 4-6 ppm upfield from the aglycone 2-fluoro-4-nitrophenol (OFPNP). We report proof of principle in cultures of PC3 prostate cancer cells using 19F NMR spectroscopy and 19F chemical shift imaging. More importantly, we demonstrate for the first time the ability to differentiate wild-type and lacZ-expressing prostate tumor xenografts in mice using this approach.
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Affiliation(s)
- Li Liu
- Department of Radiology, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Blvd, Dallas, Texas 75390-9058, USA
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Yu J, Otten P, Ma Z, Cui W, Liu L, Mason RP. Novel NMR Platform for Detecting Gene Transfection: Synthesis and Evaluation of Fluorinated Phenyl β-d-Galactosides with Potential Application for Assessing LacZ Gene Expression. Bioconjug Chem 2004; 15:1334-41. [PMID: 15546200 DOI: 10.1021/bc049936d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gene therapy holds great promise for the treatment of diverse diseases, but widespread implementation is hindered by difficulties in assessing the success of transfection. The development of noninvasive reporter techniques based on appropriate molecules and imaging modalities may help to assay gene expression. Fluorophenyl-beta-d-galactopyranosides provide a novel class of NMR active molecules, which are highly responsive to the action of beta-galactosidase (beta-gal), the product of the lacZ gene. The reporter molecules are stable in solution and with respect to wild-type cells, but the enzyme causes liberation of the aglycon, a fluorophenol, accompanied by distinct color formation and a (19)F NMR chemical shift of 5-10 ppm, depending on pH. Synthetic strategy, experimental methods, and molecular and (19)F NMR characteristics are reported for a series of molecules in solution, blood, and tumor cells. This class of molecules presents a new strategy for assaying gene expression with a highly versatile molecular structural platform.
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Affiliation(s)
- Jianxin Yu
- Department Radiology, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390-9058, USA
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Abstract
beta-Galactosidase (beta-gal) has been widely used as a transgene reporter enzyme, and several substrates are available for its in vitro detection. The ability to image beta-gal expression in living animals would further extend the use of this reporter. Here we show that DDAOG, a conjugate of beta-galactoside and 7-hydroxy-9H-(1,3-dichloro-9,9-dimethylacridin-2-one) (DDAO), is not only a chromogenic beta-gal substrate but that the cleavage product has far-red fluorescence properties detectable by imaging. Importantly, the cleavage substrate shows a 50-nm red shift, enabling its specific detection in a background of intact probe, a highly desirable feature for in vivo imaging. Specifically, we show that beta-gal-expressing 9L gliomas are readily detectable by red fluorescence imaging in comparison with the native 9L gliomas. We furthermore show that herpes simplex virus amplicon-mediated LacZ gene transfer into tumors can be transiently and thus serially visualized over time. The results indicated that in vivo real-time detection of beta-gal activity is possible by fluorescence imaging technology.
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Affiliation(s)
- Ching-Hsuan Tung
- Center for Molecular Imaging Research, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA.
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Abstract
Common strategies employed for general protein detection include organic dye, silver stain, radiolabeling, reverse stain, fluorescent stain, chemiluminescent stain and mass spectrometry-based approaches. Fluorescence-based protein detection methods have recently surpassed conventional technologies such as colloidal Coomassie blue and silver staining in terms of quantitative accuracy, detection sensitivity, and compatibility with modern downstream protein identification and characterization procedures, such as mass spectrometry. Additionally, specific detection methods suitable for revealing protein post-translational modifications have been devised over the years. These include methods for the detection of glycoproteins, phosphoproteins, proteolytic modifications, S-nitrosylation, arginine methylation and ADP-ribosylation. Methods for the detection of a range of reporter enzymes and epitope tags are now available as well, including those for visualizing beta-glucuronidase, beta-galactosidase, oligohistidine tags and green fluorescent protein. Fluorescence-based and mass spectrometry-based methodologies are just beginning to offer unparalleled new capabilities in the field of proteomics through the performance of multiplexed quantitative analysis. The primary objective of differential display proteomics is to increase the information content and throughput of proteomics studies through multiplexed analysis. Currently, three principal approaches to differential display proteomics are being actively pursued, difference gel electrophoresis (DIGE), multiplexed proteomics (MP) and isotope-coded affinity tagging (ICAT). New multiplexing capabilities should greatly enhance the applicability of the two-dimensional gel electrophoresis technique with respect to addressing fundamental questions related to proteome-wide changes in protein expression and post-translational modification.
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Affiliation(s)
- Wayne F Patton
- Proteomics Section, Biosciences Department, Molecular Probes, Inc., 4849 Pitchford Avenue, Eugene, OR 97402-9165, USA.
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