1
|
Abdulrehman T, Qadri S, Haik Y, Sultan A, Skariah S, Kumar S, Mendoza Z, Yadav KK, Titus A, Khader S. Advances in the targeted theragnostics of osteomyelitis caused by Staphylococcus aureus. Arch Microbiol 2024; 206:288. [PMID: 38834761 DOI: 10.1007/s00203-024-04015-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 05/14/2024] [Accepted: 05/20/2024] [Indexed: 06/06/2024]
Abstract
Bone infections caused by Staphylococcus aureus may lead to an inflammatory condition called osteomyelitis, which results in progressive bone loss. Biofilm formation, intracellular survival, and the ability of S. aureus to evade the immune response result in recurrent and persistent infections that present significant challenges in treating osteomyelitis. Moreover, people with diabetes are prone to osteomyelitis due to their compromised immune system, and in life-threatening cases, this may lead to amputation of the affected limbs. In most cases, bone infections are localized; thus, early detection and targeted therapy may prove fruitful in treating S. aureus-related bone infections and preventing the spread of the infection. Specific S. aureus components or overexpressed tissue biomarkers in bone infections could be targeted to deliver active therapeutics, thereby reducing drug dosage and systemic toxicity. Compounds like peptides and antibodies can specifically bind to S. aureus or overexpressed disease markers and combining these with therapeutics or imaging agents can facilitate targeted delivery to the site of infection. The effectiveness of photodynamic therapy and hyperthermia therapy can be increased by the addition of targeting molecules to these therapies enabling site-specific therapy delivery. Strategies like host-directed therapy focus on modulating the host immune mechanisms or signaling pathways utilized by S. aureus for therapeutic efficacy. Targeted therapeutic strategies in conjunction with standard surgical care could be potential treatment strategies for S. aureus-associated osteomyelitis to overcome antibiotic resistance and disease recurrence. This review paper presents information about the targeting strategies and agents for the therapy and diagnostic imaging of S. aureus bone infections.
Collapse
Affiliation(s)
- Tahir Abdulrehman
- eHealth Program, DeGroote School of Business, McMaster University, Hamilton, ON, Canada
- Health Policy, Management and Informatics, Allied Health, Credit Valley Hospital, Mississauga, ON, Canada
| | - Shahnaz Qadri
- School of Pharmacy, Texas A&M University, Kingsville, USA.
| | - Yousef Haik
- Department of Mechanical & Nuclear Engineering, University of Sharjah, Sharjah, UAE.
| | - Ali Sultan
- Department of Immunology & Microbiology, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Sini Skariah
- Department of Immunology & Microbiology, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Shourya Kumar
- School of Engineering Medicine, Texas A&M University, Houston, TX, USA
| | - Zachary Mendoza
- School of Engineering Medicine, Texas A&M University, Houston, TX, USA
| | - Kamlesh K Yadav
- School of Engineering Medicine, Texas A&M University, Houston, TX, USA
| | - Anoop Titus
- Department of Preventive Cardiology, Houston Methodist, Houston, TX, USA
| | - Shameer Khader
- School of Public Health, Faculty of Medicine, Imperial College London, London, UK
| |
Collapse
|
2
|
Liu D, Xia Q, Ding D, Tan W. Radiolabeling of functional oligonucleotides for molecular imaging. Front Bioeng Biotechnol 2022; 10:986412. [PMID: 36091456 PMCID: PMC9449898 DOI: 10.3389/fbioe.2022.986412] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 07/19/2022] [Indexed: 11/13/2022] Open
Abstract
Molecular imaging has greatly advanced basic biology and translational medicine through visualization and quantification of molecular events in a cellular context and living organisms. Nuclear medicine, including positron emission tomography (PET) and single-photon emission tomography (SPECT), is one of the most representative molecular imaging modalities which is widely used in clinical theranostics. Recently, numerous molecular imaging agents have been developed to improve the quality and expand the applicable diseases of molecular imaging. Based on the choice of specific imaging agents, molecular imaging is capable of studying tumor biological activities, detecting tumor metastasis, and imaging Alzheimer’s disease-related amyloid proteins. Among these imaging agents, functional oligonucleotides-based imaging probes are becoming increasingly important due to their unique features. Antisense oligonucleotides, small interfering RNA, and aptamers are privileged molecular tools in precision medicine for cancer diagnosis and treatment. These chemically synthesized oligonucleotides without batch-to-batch variations are flexible to incorporate with other molecules without affecting their functionalities. Therefore, through the combination of oligonucleotides with radioisotopes, a series of molecular imaging agents were developed in the past decades to achieve highly sensitive and accurate biomedical imaging modalities for clinical theranostic. Due to the nature of oligonucleotides, the strategies of oligonucleotide radiolabeling are different from conventional small molecular tracers, and the radiolabeling strategy with rational design is highly correlated to the imaging quality. In this review, we summarize recent advancements in functional oligonucleotide radiolabeling strategies and respective molecular imaging applications. Meanwhile, challenges and future development insights of functional oligonucleotide-based radiopharmaceuticals are discussed in the end.
Collapse
Affiliation(s)
- Dunfang Liu
- Institute of Molecular Medicine (IMM), Renji Hospital, State Key Laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine and College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
- Department of Nuclear Medicine, Institute of Clinical Nuclear Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Qian Xia
- Institute of Molecular Medicine (IMM), Renji Hospital, State Key Laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine and College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
- Department of Nuclear Medicine, Institute of Clinical Nuclear Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Ding Ding, ; Qian Xia,
| | - Ding Ding
- Institute of Molecular Medicine (IMM), Renji Hospital, State Key Laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine and College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Ding Ding, ; Qian Xia,
| | - Weihong Tan
- Institute of Molecular Medicine (IMM), Renji Hospital, State Key Laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine and College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
- The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou, Zhejiang, China
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, China
| |
Collapse
|
3
|
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: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [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.
Collapse
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
| |
Collapse
|
4
|
Wan Q, Liu X, Zu Y. Oligonucleotide aptamers for pathogen detection and infectious disease control. Theranostics 2021; 11:9133-9161. [PMID: 34522231 PMCID: PMC8419047 DOI: 10.7150/thno.61804] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 08/04/2021] [Indexed: 12/21/2022] Open
Abstract
During an epidemic or pandemic, the primary task is to rapidly develop precise diagnostic approaches and effective therapeutics. Oligonucleotide aptamer-based pathogen detection assays and control therapeutics are promising, as aptamers that specifically recognize and block pathogens can be quickly developed and produced through simple chemical synthesis. This work reviews common aptamer-based diagnostic techniques for communicable diseases and summarizes currently available aptamers that target various pathogens, including the SARS-CoV-2 virus. Moreover, this review discusses how oligonucleotide aptamers might be leveraged to control pathogen propagation and improve host immune system responses. This review offers a comprehensive data source to the further develop aptamer-based diagnostics and therapeutics specific for infectious diseases.
Collapse
Affiliation(s)
| | | | - Youli Zu
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX 77030, USA
| |
Collapse
|
5
|
Ordoñez AA, Jain SK. Imaging of Bacterial Infections. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00089-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
6
|
Bagheri pebdeni A, Hosseini M. Fast and selective whole cell detection of Staphylococcus aureus bacteria in food samples by paper based colorimetric nanobiosensor using peroxidase-like catalytic activity of DNA-Au/Pt bimetallic nanoclusters. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105475] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
7
|
Calzada V. Aptamers in Diagnostic and Molecular Imaging Applications. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2020; 174:141-160. [PMID: 31848635 DOI: 10.1007/10_2019_115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The origin of the term diagnostic comes from the Greek word gnosis, meaning "to know." In medicine, a diagnostic can predict the pathology risk, disease status, treatment, and prognosis, even following therapy. An early and correct diagnosis is necessary for an efficient treatment. Moreover, it is possible to predict if and why a therapy will be successful or fail, enabling the timely application of alternative therapeutic strategies. Available diagnostics are due to the advances in biotechnology; however, more sensitive, low-cost, and noninvasive methodologies are still a challenge. Knowledge about molecular characteristics provide personalized information, which is the goal of future medicine. Today, multiple diagnostic techniques have emerged, with which it is possible to distinguish molecular patterns.In this way, aptamers are the perfect tools to recognize molecular targets and can be easily modified to confer additional functions. Their versatile characteristics and low cost make aptamers ideal for diagnostic applications.This chapter is a review of aptamer-based diagnostics in biomedicine, with a special focus on probe design and molecular imaging. Graphical Abstract.
Collapse
Affiliation(s)
- Victoria Calzada
- Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
| |
Collapse
|
8
|
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.
Collapse
|
9
|
|
10
|
Clinical aspects of radiolabeled aptamers in diagnostic nuclear medicine: A new class of targeted radiopharmaceuticals. Bioorg Med Chem 2018; 27:2282-2291. [PMID: 30502114 DOI: 10.1016/j.bmc.2018.11.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/16/2018] [Accepted: 11/21/2018] [Indexed: 12/31/2022]
Abstract
Targeted radiopharmaceuticals offer the possibility of improved imaging with reduced side effects. Up to now, a variety of biological receptors such as aptamers have been successfully radiolabeled and applied to diagnostic imaging of cancers. The concept of using radio-labeled aptamers for binding to their targets has stimulated an immense body of research in diagnostic nuclear medicine. These biological recognition elements are single-stranded oligonucleotides that interact with their target molecules with high affinity and specificity in unique three-dimensional structures. Because of their high affinity and specificity, the receptor-binding aptamers labeled with gamma emitters such as 99mTc, 64Cu, 111In, 18F and 67Ga can facilitate the visualization of receptor-expressing tissues noninvasively. Compared to the antibody-based radiopharmaceuticals, the radiolabeled aptamers provide a number of advantages for clinical diagnostics including high stability, low cost, and ease of production and modification, low immunogenicity and, especially, superior tissue penetration because of their smaller size. In this review, we present recent progresses and challenges in aptamer-based diagnostic radiopharmaceuticals and highlight some representative applications of aptamers in nuclear medicine.
Collapse
|
11
|
Hassanzadeh L, Chen S, Veedu RN. Radiolabeling of Nucleic Acid Aptamers for Highly Sensitive Disease-Specific Molecular Imaging. Pharmaceuticals (Basel) 2018; 11:E106. [PMID: 30326601 PMCID: PMC6315947 DOI: 10.3390/ph11040106] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 10/06/2018] [Accepted: 10/10/2018] [Indexed: 12/14/2022] Open
Abstract
Aptamers are short single-stranded DNA or RNA oligonucleotide ligand molecules with a unique three-dimensional shape, capable of binding to a defined molecular target with high affinity and specificity. Since their discovery, aptamers have been developed for various applications, including molecular imaging, particularly nuclear imaging that holds the highest potential for the clinical translation of aptamer-based molecular imaging probes. Their easy laboratory production without any batch-to-batch variations, their high stability, their small size with no immunogenicity and toxicity, and their flexibility to incorporate various functionalities without compromising the target binding affinity and specificity make aptamers an attractive class of targeted-imaging agents. Aptamer technology has been utilized in nuclear medicine imaging techniques, such as single photon emission computed tomography (SPECT) and positron emission tomography (PET), as highly sensitive and accurate biomedical imaging modalities towards clinical diagnostic applications. However, for aptamer-targeted PET and SPECT imaging, conjugation of appropriate radionuclides to aptamers is crucial. This review summarizes various strategies to link the radionuclides to chemically modified aptamers to accomplish aptamer-targeted PET and SPECT imaging.
Collapse
Affiliation(s)
- Leila Hassanzadeh
- Department of Nuclear Medicine, School of Medicine, Rajaie Cardiovascular, Medical and Research Center & Department of Medicinal Chemistry, School of Pharmacy-International Campus, Iran University of Medical Sciences, Tehran 1449614535, Iran.
- Centre for Comparative Genomics, Murdoch University, Perth 6150, Australia.
| | - Suxiang Chen
- Centre for Comparative Genomics, Murdoch University, Perth 6150, Australia.
- Perron Institute for Neurological and Translational Science, Perth 6009, Australia.
| | - Rakesh N Veedu
- Centre for Comparative Genomics, Murdoch University, Perth 6150, Australia.
- Perron Institute for Neurological and Translational Science, Perth 6009, Australia.
| |
Collapse
|
12
|
Salmanoglu E, Kim S, Thakur ML. Currently Available Radiopharmaceuticals for Imaging Infection and the Holy Grail. Semin Nucl Med 2018; 48:86-99. [PMID: 29452623 PMCID: PMC6487501 DOI: 10.1053/j.semnuclmed.2017.10.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Infection is ubiquitous. However, its management is challenging for both the patients and the health-care providers. Scintigraphic imaging of infection dates back nearly half a century. The advances in our understanding of the pathophysiology of disease at cellular and molecular levels have paved the way to the development of a large number of radiopharmaceuticals for scintigraphic imaging of infection. These include radiolabeling of blood elements such as serum proteins, white blood cells (WBCs), and cytokines, to name a few. Infectious foci have also been imaged using a radiolabeled sugar molecule by taking advantage of increased metabolic activity in the infectious lesions. Literature over the years has well documented that none of the radiopharmaceuticals and associated procedures that facilitate imaging infection are flawless and acceptable without a compromise. As a result, only a few compounds such as 99mTc-hexamethylpropyleneamineoxime, 18F-FDG, the oldest but still considered as a gold standard 111In-oxine, and, yes, even 67Ga-citrate in some countries, have remained in routine clinical practice. Nonetheless, the interest of scientists and physicians to improve the approaches to imaging and to the management of infection is noteworthy. These approaches have paved the way for the development of numerous, innovative radiopharmaceuticals to label autologous WBCs ex vivo or even those that could be injected directly to image infection or inflammation without direct involvement of WBCs. In this review, we briefly describe these agents with their pros and cons and place them together for future reference.
Collapse
Affiliation(s)
- Ebru Salmanoglu
- Department of Radiology, Thomas Jefferson University, Philadelphia, PA 19107; Department of Nuclear Medicine, Kahramanmaras Sutcu Imam University Faculty of Medicine, Avsar Kampus, Kahramanmaras 46040, Turkey
| | - Sung Kim
- Department of Radiology, Thomas Jefferson University, Philadelphia, PA 19107
| | - Mathew L Thakur
- Department of Radiology, Thomas Jefferson University, Philadelphia, PA 19107; Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107.
| |
Collapse
|
13
|
Ordonez AA, Jain SK. Pathogen-Specific Bacterial Imaging in Nuclear Medicine. Semin Nucl Med 2018. [DOI: 10.1053/j.semnuclmed.2017.11.003
expr 890398765 + 809902709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
|
14
|
Abstract
When serious infections are suspected, patients are often treated empirically with broad-spectrum antibiotics while awaiting results that provide information on the bacterial class and species causing the infection, as well as drug susceptibilities. For deep-seated infections, these traditional diagnostic techniques often rely on tissue biopsies to obtain clinical samples which can be expensive, dangerous, and has the potential of sampling bias. Moreover, these procedures and results can take several days and may not always provide reliable information. This combination of time and effort required for proper antibiotic selection has become a barrier leading to indiscriminate broad-spectrum antibiotic use. Exposure to nosocomial infections and indiscriminate use of broad-spectrum antibiotics are responsible for promoting bacterial drug-resistance leading to substantial morbidity and mortality, especially in hospitalized and immunosuppressed patients. Therefore, early diagnosis of infection and targeted antibiotic treatments are urgently needed to reduce morbidity and mortality caused by bacterial infections worldwide. Reliable pathogen-specific bacterial imaging techniques have the potential to provide early diagnosis and guide antibiotic treatments.
Collapse
Affiliation(s)
- Alvaro A Ordonez
- Center for Infection and Inflammation Imaging Research, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Sanjay K Jain
- Center for Infection and Inflammation Imaging Research, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD.
| |
Collapse
|
15
|
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.
Collapse
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.
| |
Collapse
|
16
|
Santos SRD, de Sousa Lacerda CM, Ferreira IM, de Barros ALB, Fernandes SO, Cardoso VN, de Andrade ASR. Scintigraphic imaging of Staphylococcus aureus infection using 99mTc radiolabeled aptamers. Appl Radiat Isot 2017; 128:22-27. [PMID: 28683356 DOI: 10.1016/j.apradiso.2017.06.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 05/09/2017] [Accepted: 06/27/2017] [Indexed: 01/31/2023]
Abstract
Staphylococcus aureus is a specie of great medical importance associated with many infections as bacteremia and infective endocarditis as well as osteoarticular, skin and soft tissue, pleuropulmonary, and device related infections. Early identification of infectious foci is crucial for successful treatment. Scintigraphy could contribute to this purpose since specific radiotracers were available. Aptamers due to their high specificity have great potential for radiopharmaceuticals development. In the present study scintigraphic images of S. aureus infectious foci were obtained using specific S. aureus aptamers radiolabeled with 99mTc.
Collapse
Affiliation(s)
- Sara Roberta Dos Santos
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/No, 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/No, Cidade Universitária-Campus da UFMG, 31120-970 Belo Horizonte, MG, Brazil.
| | - Iêda Mendes Ferreira
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/No, 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 (UFMG), 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 (UFMG), 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 (UFMG), 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/No, Cidade Universitária-Campus da UFMG, 31120-970 Belo Horizonte, MG, Brazil.
| |
Collapse
|
17
|
Dutta J, Naicker T, Ebenhan T, Kruger HG, Arvidsson PI, Govender T. Synthetic approaches to radiochemical probes for imaging of bacterial infections. Eur J Med Chem 2017; 133:287-308. [DOI: 10.1016/j.ejmech.2017.03.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 03/23/2017] [Accepted: 03/24/2017] [Indexed: 02/08/2023]
|
18
|
Chandola C, Kalme S, Casteleijn MG, Urtti A, Neerathilingam M. Application of aptamers in diagnostics, drug-delivery and imaging. J Biosci 2017; 41:535-61. [PMID: 27581942 DOI: 10.1007/s12038-016-9632-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Aptamers are small, single-stranded oligonucleotides (DNA or RNA) that bind to their target with high specificity and affinity. Although aptamers are analogous to antibodies for a wide range of target recognition and variety of applications, they have significant advantages over antibodies. Since aptamers have recently emerged as a class of biomolecules with an application in a wide array of fields, we need to summarize the latest developments herein. In this review we will discuss about the latest developments in using aptamers in diagnostics, drug delivery and imaging. We begin with diagnostics, discussing the application of aptamers for the detection of infective agents itself, antigens/ toxins (bacteria), biomarkers (cancer), or a combination. The ease of conjugation and labelling of aptamers makes them a potential tool for diagnostics. Also, due to the reduced off-target effects of aptamers, their use as a potential drug delivery tool is emerging rapidly. Hence, we discuss their use in targeted delivery in conjugation with siRNAs, nanoparticles, liposomes, drugs and antibodies. Finally, we discuss about the conjugation strategies applicable for RNA and DNA aptamers for imaging. Their stability and self-assembly after heating makes them superior over protein-based binding molecules in terms of labelling and conjugation strategies.
Collapse
Affiliation(s)
- Chetan Chandola
- 1Center for Cellular and Molecular Platforms, NCBS-TIFR, Bangalore 560 065, India
| | | | | | | | | |
Collapse
|
19
|
de Sousa Lacerda CM, Ferreira IM, Dos Santos SR, de Barros ALB, Fernandes SO, Cardoso VN, de Andrade ASR. (1→3)-β-D-glucan aptamers labeled with technetium-99m: Biodistribution and imaging in experimental models of bacterial and fungal infection. Nucl Med Biol 2016; 46:19-24. [PMID: 27951452 DOI: 10.1016/j.nucmedbio.2016.11.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 10/18/2016] [Accepted: 11/24/2016] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Acid nucleic aptamers are RNA or DNA oligonucleotides capable of binding to a target molecule with high affinity and selectivity. These molecules are promising tools in nuclear medicine. Many aptamers have been used as targeting molecule of radiopharmaceuticals in preclinical studies. (1→3)-β-D-glucans are the main structural cell wall components of fungi and some bacteria. In the present study two radiolabeled (1→3)-β-D-glucan aptamers (seq6 and seq30) were evaluated to identity infectious foci caused by fungal or bacterial cells. METHODS Aptamer labeling with 99mTc was performed by the direct method and biodistribution studies were accomplished in Swiss mice (n=6) infected in the right thigh muscle with Staphylococcus aureus or Candida albicans. A 99mTc radiolabeled library consisting of oligonucleotides with random sequences was used as control. RESULTS There was a higher uptake of 99mTc radiolabeled aptamers in the infected thigh than in the left thigh muscle (non-infected) in the S. aureus infected animals. The target/non-target ratios were 3.17±0.22 for seq6 and 2.66±0.10 for seq30. These ratios were statistically higher than the value (1.54±0.05) found for the radiolabeled library (control). With regard to biodistribution, no statistical difference was verified between aptamers and control uptakes in the infection foci in the C. albicans infected animals. The target/non-target ratios were 1.53±0.03, 1.64±0.12 and 1.08±0.02 for radiolabeled library, seq6 and seq30, respectively. Scintigraphic imaging of infected foci using radiolabeled aptamers was possible only for S. aureus infected mice. CONCLUSIONS Seq6 and seq30 aptamers proved to be inefficient for diagnosis of C. albicans infection. Nevertheless, their applicability for diagnosis of S. aureus and other bacterial infections by scintigraphy should be further explored.
Collapse
Affiliation(s)
- Camila Maria de Sousa Lacerda
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31120-970, Brazil.
| | - Iêda Mendes Ferreira
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31120-970, Brazil.
| | - Sara Roberta Dos Santos
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31120-970, 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, Belo Horizonte, MG 31270-091, Brazil.
| | - Simone Odília Fernandes
- Departamento de Análises Clínicas e Toxicológicas-Faculdade de Farmácia, Universidade Federal de Minas Gerais, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31270-091, Brazil.
| | - Valbert Nascimento Cardoso
- Departamento de Análises Clínicas e Toxicológicas-Faculdade de Farmácia, Universidade Federal de Minas Gerais, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31270-091, Brazil.
| | - Antero Silva Ribeiro de Andrade
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária-Campus da UFMG, Belo Horizonte, MG 31120-970, Brazil.
| |
Collapse
|
20
|
G-quadruplex aptamer targeting Protein A and its capability to detect Staphylococcus aureus demonstrated by ELONA. Sci Rep 2016; 6:33812. [PMID: 27650576 PMCID: PMC5030626 DOI: 10.1038/srep33812] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 08/24/2016] [Indexed: 01/15/2023] Open
Abstract
Aptamers for whole cell detection are selected mostly by the Cell-SELEX procedure. Alternatively, the use of specific cell surface epitopes as target during aptamer selections allows the development of aptamers with ability to bind whole cells. In this study, we integrated a formerly selected Protein A-binding aptamer PA#2/8 in an assay format called ELONA (Enzyme-Linked OligoNucleotide Assay) and evaluated the ability of the aptamer to recognise and bind to Staphylococcus aureus presenting Protein A on the cell surface. The full-length aptamer and one of its truncated variants could be demonstrated to specifically bind to Protein A-expressing intact cells of S. aureus, and thus have the potential to expand the portfolio of aptamers that can act as an analytical agent for the specific recognition and rapid detection of the bacterial pathogen. The functionality of the aptamer was found to be based on a very complex, but also highly variable structure. Two structural key elements were identified. The aptamer sequence contains several G-clusters allowing folding into a G-quadruplex structure with the potential of dimeric and multimeric assembly. An inverted repeat able to form an imperfect stem-loop at the 5'-end also contributes essentially to the aptameric function.
Collapse
|
21
|
Systematic review of in vivo microorganisms imaging with labeled vitamins, bacteriophages and oligomers. Clin Transl Imaging 2016. [DOI: 10.1007/s40336-016-0182-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
22
|
Gijs M, Aerts A, Impens N, Baatout S, Luxen A. Aptamers as radiopharmaceuticals for nuclear imaging and therapy. Nucl Med Biol 2015; 43:253-71. [PMID: 26746572 DOI: 10.1016/j.nucmedbio.2015.09.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/24/2015] [Accepted: 09/10/2015] [Indexed: 12/27/2022]
Abstract
Today, radiopharmaceuticals belong to the standard instrumentation of nuclear medicine, both in the context of diagnosis and therapy. The majority of radiopharmaceuticals consist of targeting biomolecules which are designed to interact with a disease-related molecular target. A plethora of targeting biomolecules of radiopharmaceuticals exists, including antibodies, antibody fragments, proteins, peptides and nucleic acids. Nucleic acids have some significant advantages relative to proteinaceous biomolecules in terms of size, production, modifications, possible targets and immunogenicity. In particular, aptamers (non-coding, synthetic, single-stranded DNA or RNA oligonucleotides) are of interest because they can bind a molecular target with high affinity and specificity. At present, few aptamers have been investigated preclinically for imaging and therapeutic applications. In this review, we describe the use of aptamers as targeting biomolecules of radiopharmaceuticals. We also discuss the chemical modifications which are needed to turn aptamers into valuable (radio-)pharmaceuticals, as well as the different radiolabeling strategies that can be used to radiolabel oligonucleotides and, in particular, aptamers.
Collapse
Affiliation(s)
- Marlies Gijs
- Radiobiology Unit, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium; Cyclotron Research Centre, University of Liège, Liège, Belgium
| | - An Aerts
- Radiobiology Unit, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Nathalie Impens
- Radiobiology Unit, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Sarah Baatout
- Radiobiology Unit, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - André Luxen
- Cyclotron Research Centre, University of Liège, Liège, Belgium.
| |
Collapse
|