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Ommen P, Hansen L, Hansen BK, Vu-Quang H, Kjems J, Meyer RL. Aptamer-Targeted Drug Delivery for Staphylococcus aureus Biofilm. Front Cell Infect Microbiol 2022; 12:814340. [PMID: 35573794 PMCID: PMC9104115 DOI: 10.3389/fcimb.2022.814340] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 02/09/2022] [Indexed: 12/12/2022] Open
Abstract
Treatment of Staphylococcus aureus biofilm infections using conventional antibiotic therapy is challenging as only doses that are sublethal to the biofilm can be administered safely to patients. A potential solution to this challenge is targeted drug delivery. In this study, we tailored an aptamer-targeted liposomal drug delivery system for accumulation and delivery of antibiotics locally in S. aureus biofilm. In our search for a suitable targeting ligand, we identified six DNA aptamers that bound to S. aureus cells in biofilms, and we demonstrated that one of these aptamers could facilitate accumulation of liposomes around S. aureus cells inside the biofilm. Aptamer-targeted liposomes encapsulating a combination of vancomycin and rifampicin were able to eradicate S. aureus biofilm upon 24 h of treatment in vitro. Our results point to that aptamer-targeted drug delivery of antibiotics is a potential new strategy for treatment of S. aureus biofilm infections.
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Affiliation(s)
- Pernille Ommen
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
| | - Line Hansen
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
| | - Bente K. Hansen
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
| | - Hieu Vu-Quang
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
| | - Jørgen Kjems
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
- Department of Bioscience, Aarhus University, Aarhus C, Denmark
| | - Rikke L. Meyer
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus C, Denmark
- Department of Bioscience, Aarhus University, Aarhus C, Denmark
- *Correspondence: Rikke L. Meyer,
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Sorgenfrei M, Hürlimann LM, Remy MM, Keller PM, Seeger MA. Biomolecules capturing live bacteria from clinical samples. Trends Biochem Sci 2022; 47:673-688. [PMID: 35487808 DOI: 10.1016/j.tibs.2022.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 02/04/2022] [Accepted: 03/22/2022] [Indexed: 10/18/2022]
Abstract
Rapid phenotypic antimicrobial susceptibility testing (AST) requires the enrichment of live bacteria from patient samples, which is particularly challenging in the context of life-threatening bloodstream infections (BSIs) due to low bacterial titers. Over two decades, an extensive array of pathogen-specific biomolecules has been identified to capture live bacteria. The prevailing biomolecules are immune proteins of the complement system, antibodies, aptamers, phage proteins, and antimicrobial peptides. These biomolecules differ by their binder generation technologies and exhibit highly variable specificities, ranging from bacterial strains to most pathogenic bacteria. Here, we summarize how these diverse biomolecules were identified, list examples of successfully reported capture assays, and provide an outlook on the use of nanobodies raised against conserved surface-accessible proteins as promising biomolecules for pathogen capture.
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Affiliation(s)
- Michèle Sorgenfrei
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Lea M Hürlimann
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Mélissa M Remy
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Peter M Keller
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland.
| | - Markus A Seeger
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland.
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Advances in aptamer-based nuclear imaging. Eur J Nucl Med Mol Imaging 2022; 49:2544-2559. [PMID: 35394153 DOI: 10.1007/s00259-022-05782-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 03/26/2022] [Indexed: 01/12/2023]
Abstract
Aptamers are short oligonucleotides that bind to specific target molecules. They have been extensively explored in biomedical applications, including biosensing, medical imaging, and disease treatment. Their adjustable affinity for specific biomarkers stimulates more translational efforts, such as nuclear imaging of tumors in preclinical and clinical settings. In this review, we present recent advances of aptamer-based nuclear imaging and compare aptamer tracers with other biogenic probes in forms of peptides, nanobodies, monoclonal antibodies, and antibody fragments. Fundamental properties of aptamer-based radiotracers are highlighted and potential directions to improve aptamer's imaging performance are discussed. Despite many translational obstacles to overcome, we envision aptamers to be a versatile tool for cancer nuclear imaging in the near future.
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Jiao Y, Xu P, Luan S, Wang X, Gao Y, Zhao C, Fu P. Molecular imaging and treatment of PSMA-positive prostate cancer with 99mTc radiolabeled aptamer-siRNA chimeras. Nucl Med Biol 2021; 104-105:28-37. [PMID: 34847481 DOI: 10.1016/j.nucmedbio.2021.11.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 11/08/2021] [Accepted: 11/16/2021] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Prostate-specific membrane antigen (PSMA) is highly expressed in prostate cancer (PCa). The aptamer (Apt) A10-3.2 can be used as a specific ligand for the early diagnosis and targeted treatment of PCa. siRNA-Apt has been used to therapeutically target PSMA-positive PCa. We aimed to synthesize a new type of molecular probe to facilitate the integration of diagnosis and treatment for PSMA-positive PCa. METHODS Chimeras were obtained by covalent linking PSMA Apt-A10-3.2 and the MDM2 siRNA. SHNH, a bifunctional chelating agent, was used to couple 99mTc with chimeras to synthesize a new molecular probe. Labeling efficiency, radiochemical purity, and stability were confirmed using a γ-well counter and Whatman paper No.1. SPECT imaging and biodistribution studies were performed on BALB/c mice bearing 22Rv1 or PC-3 xenografts. Tumor inhibition and cytotoxicity of Chimeras were evaluated. LNCaP, 22RV1, and PC-3 PCa cell lines were used for in vitro and in vivo experiments. RESULTS [99mTc]Tc-chimeras showed high labeling efficiency (61.47% ± 2.85%, n = 3), radiochemical purity (>95%), and stability. Biodistribution studies and SPECT imaging with 99mTc-chimeras in mice bearing 22Rv1 xenografts demonstrated a high T/M ratio (4.63 ± 0.68, n = 3) and a high T/B ratio (3.61 ± 0.7, n = 3) at 2 h post-injection. 99mTc-chimeras showed rapid renal clearance. Compared with the PBS group, tumor growth in the chimera group was significantly inhibited (P < 0.01, n = 4), but there was no significant difference in body weight (p > 0.05, n = 4). H&E staining showed no obvious liver or kidney damage. CONCLUSIONS Our study proved that [99mTc]Tc-Aptamer-siRNA chimeras could be used to diagnose and treat PSMA-positive PCa in vivo.
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Affiliation(s)
- Yuying Jiao
- Department of Nuclear Medicine, 1st Hospital of Harbin Medical University, Harbin, 150000, China
| | - Peng Xu
- Department of Nuclear Medicine, 1st Hospital of Harbin Medical University, Harbin, 150000, China
| | - Sha Luan
- Department of Nuclear Medicine, 4th Hospital of Harbin Medical University, Harbin, 150000, China
| | - Xinyu Wang
- Department of Nuclear Medicine, 4th Hospital of Harbin Medical University, Harbin, 150000, China
| | - Yue Gao
- Department of Nuclear Medicine, 4th Hospital of Harbin Medical University, Harbin, 150000, China
| | - Changjiu Zhao
- Department of Nuclear Medicine, 1st Hospital of Harbin Medical University, Harbin, 150000, China.
| | - Peng Fu
- Department of Nuclear Medicine, 1st Hospital of Harbin Medical University, Harbin, 150000, China.
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Liu LS, Wang F, Ge Y, Lo PK. Recent Developments in Aptasensors for Diagnostic Applications. ACS APPLIED MATERIALS & INTERFACES 2021; 13:9329-9358. [PMID: 33155468 DOI: 10.1021/acsami.0c14788] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Aptamers are exciting smart molecular probes for specific recognition of disease biomarkers. A number of strategies have been developed to convert target-aptamer binding into physically detectable signals. Since the aptamer sequence was first discovered, a large variety of aptamer-based biosensors have been developed, with considerable attention paid to their potential applications in clinical diagnostics. So far, a variety of techniques in combination with a wide range of functional nanomaterials have been used for the design of aptasensors to further improve the sensitivity and detection limit of target determination. In this paper, the advantages of aptamers over traditional antibodies as the molecular recognition components in biosensors for high-throughput screening target molecules are highlighted. Aptamer-target pairing configurations are predominantly single- or dual-site binding; the design of recognition modes of each aptamer-target pairing configuration is described. Furthermore, signal transduction strategies including optical, electrical, mechanical, and mass-sensitive modes are clearly explained together with examples. Finally, we summarize the recent progress in the development of aptamer-based biosensors for clinical diagnosis, including detection of cancer and disease biomarkers and in vivo molecular imaging. We then conclude with a discussion on the advanced development and challenges of aptasensors.
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Affiliation(s)
- Ling Sum Liu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Fei Wang
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Yonghe Ge
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Pik Kwan Lo
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, 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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Ducongé F. Aptamers for Molecular Imaging. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00034-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Evaluation of the specific uptake of radiolabeled Staphylococcus aureus aptamers in the infectious foci. Appl Radiat Isot 2020; 158:109047. [PMID: 31989931 DOI: 10.1016/j.apradiso.2020.109047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/05/2019] [Accepted: 01/16/2020] [Indexed: 11/22/2022]
Abstract
The specific uptake of 99mTc radiolabeled Staphylococcus aureus aptamers in the infectious foci was evaluated by scintigraphic imaging of infection-bearing mice. The radiotracer uptake was inhibited by non-radiolabeled aptamers in a competition assay. In addition, when a different number of bacterial cells was used to infect mice an increase in the target/non-target ratios of images correlated with the increase of CFU per gram of tissue was verified. These results confirmed that 99mTc-aptamers were specific to bacterial focus and the level of uptake was dependent on the number of bacterial cells.
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Lim J, Choi J, Guk K, Son SU, Lee DK, Yeom SJ, Kang T, Jung J, Lim EK. Peptidoglycan binding protein (PGBP)-modified magnetic nanobeads for efficient magnetic capturing of Staphylococcus aureus associated with sepsis in blood. Sci Rep 2019; 9:129. [PMID: 30644425 PMCID: PMC6333782 DOI: 10.1038/s41598-018-37194-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 12/04/2018] [Indexed: 12/16/2022] Open
Abstract
Peptidoglycan-binding protein-modified magnetic nanobeads (PGBP-MNBs) were prepared for efficient magnetic capturing of Staphylococcus aureus (S. aureus), which is associated with sepsis, using the binding affinity of PGBP for the peptidoglycan (PG) layer on S. aureus. These PGBP-MNBs can simply capture S. aureus in plasma within 1 hr or even 15 min. Importantly, they also can capture various types of Gram-positive bacteria, such as Bacillus cereus and methicillin-resistant and methicillin-susceptible S. aureus (MRSA and MSSA). We believe that PGBP-based systems will be used to develop diagnostic systems for Gram-positive bacteria-related diseases.
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Affiliation(s)
- Jaewoo Lim
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Jongmin Choi
- BioNano Health Guard Research Center, 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Kyeonghye Guk
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Seong Uk Son
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Do Kyung Lee
- BioNano Health Guard Research Center, 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Soo-Jin Yeom
- Synthetic Biology & Bioengineering Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
| | - Taejoon Kang
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Juyeon Jung
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea.
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
| | - Eun-Kyung Lim
- Hazards Monitoring Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, South Korea.
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
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Application of aptamers for in vivo molecular imaging and theranostics. Adv Drug Deliv Rev 2018; 134:94-106. [PMID: 30125606 DOI: 10.1016/j.addr.2018.08.004] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 07/06/2018] [Accepted: 08/16/2018] [Indexed: 12/11/2022]
Abstract
Nucleic acid aptamers are small three-dimensional structures of oligonucleotides selected to bind to a target of interest with high affinity and specificity. In vitro, aptamers already compete with antibodies to serve as imaging probes, e.g. for microscopy or flow cytometry. However, they are also increasingly used for in vivo molecular imaging. Accordingly, aptamers have been evaluated over the last twenty years in almost every imaging modality, including single photon emission computed tomography, positron emission tomography, magnetic resonance imaging, fluorescence imaging, echography, and x-ray computed tomography. This review focuses on the studies that were conducted in vivo with aptamer-based imaging probes. It also presents how aptamers have been recently used to develop new types of probes for multimodal imaging and theranostic applications.
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Ferreira IM, de Sousa Lacerda CM, Dos Santos SR, de Barros ALB, Fernandes SO, Cardoso VN, de Andrade ASR. Detection of bacterial infection by a technetium-99m-labeled peptidoglycan aptamer. Biomed Pharmacother 2017; 93:931-938. [PMID: 28715874 DOI: 10.1016/j.biopha.2017.07.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/05/2017] [Accepted: 07/05/2017] [Indexed: 10/19/2022] Open
Abstract
Nuclear medicine clinicians are still waiting for the optimal scintigraphic imaging agents capable of distinguishing between infection and inflammation, and between fungal and bacterial infections. Aptamers have several properties that make them suitable for molecular imaging. In the present study, a peptidoglycan aptamer (Antibac1) was labeled with 99mTc and evaluated by biodistribution studies and scintigraphic imaging in infection-bearing mice. Labeling with 99mTc was performed by the direct method and the complex stability was evaluated in saline, plasma and in the molar excess of cysteine. The biodistribution and scintigraphic imaging studies with the 99mTc-Antibac1 were carried out in two different experimental infection models: Bacterial-infected mice (S. aureus) and fungal-infected mice (C. albicans). A 99mTc radiolabeled library, consisting of oligonucleotides with random sequences, was used as a control for both models. Radiolabeling yields were superior to 90% and 99mTc-Antibac1 was highly stable in presence of saline, plasma, and cysteine up to 6h. Scintigraphic images of S. aureus infected mice at 1.5 and 3.0h after 99mTc-Antibac1 injection showed target to non-target ratios of 4.7±0.9 and 4.6±0.1, respectively. These values were statistically higher than those achieved for the 99mTc-library at the same time frames (1.6±0.4 and 1.7±0.4, respectively). Noteworthy, 99mTc-Antibac1 and 99mTc-library showed similar low target to non-target ratios in the fungal-infected model: 2.0±0.3 and 2.0±0.6for 99mTc-Antibac1 and 2.1±0.3 and 1.9 ± 0.6 for 99mTc-library, at the same times. These findings suggest that the 99mTc-Antibac1 is a feasible imaging probe to identify a bacterial infection focus. In addition, this radiolabeled aptamer seems to be suitable in distinguishing between bacterial and fungal infection.
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Affiliation(s)
- Iêda Mendes Ferreira
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária, Campus da UFMG, 31120-970, Belo Horizonte, MG, Brazil.
| | - Camila Maria de Sousa Lacerda
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária, Campus da UFMG, 31120-970, Belo Horizonte, MG, Brazil.
| | - Sara Roberta Dos Santos
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária, Campus da UFMG, 31120-970, Belo Horizonte, MG, Brazil.
| | - André Luís Branco de Barros
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Cidade Universitária, Campus da UFMG, 31270-091, Belo Horizonte, MG, Brazil.
| | - Simone Odília Fernandes
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Cidade Universitária, Campus da UFMG, 31270-091, Belo Horizonte, MG, Brazil.
| | - Valbert Nascimento Cardoso
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Cidade Universitária, Campus da UFMG, 31270-091, Belo Horizonte, MG, Brazil.
| | - Antero Silva Ribeiro de Andrade
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária, Campus da UFMG, 31120-970, Belo Horizonte, MG, Brazil.
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