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Ozerskaya AV, Zamay TN, Kolovskaya OS, Tokarev NA, Belugin KV, Chanchikova NG, Badmaev ON, Zamay GS, Shchugoreva IA, Moryachkov RV, Zabluda VN, Khorzhevskii VA, Shepelevich N, Gappoev SV, Karlova EA, Saveleva AS, Volzhentsev AA, Blagodatova AN, Lukyanenko KA, Veprintsev DV, Smolyarova TE, Tomilin FN, Zamay SS, Silnikov VN, Berezovski MV, Kichkailo AS. 11C-radiolabeled aptamer for imaging of tumors and metastases using positron emission tomography- computed tomography. MOLECULAR THERAPY. NUCLEIC ACIDS 2021; 26:1159-1172. [PMID: 34853715 PMCID: PMC8601970 DOI: 10.1016/j.omtn.2021.10.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 07/30/2021] [Accepted: 10/19/2021] [Indexed: 11/25/2022]
Abstract
Identification of primary tumors and metastasis sites is an essential step in cancer diagnostics and the following treatment. Positron emission tomography-computed tomography (PET/CT) is one of the most reliable methods for scanning the whole organism for malignancies. In this work, we synthesized an 11C-labeled oligonucleotide primer and hybridized it to an anti-cancer DNA aptamer. The 11C-aptamer was applied for in vivo imaging of Ehrlich ascites carcinoma and its metastases in mice using PET/CT. The imaging experiments with the 11C-aptamer determined very small primary and secondary tumors of 3 mm2 and less. We also compared 11C imaging with the standard radiotracer, 2-deoxy-2-[fluorine-18]fluoro-D-glucose (18F-FDG), and found better selectivity of the 11C-aptamer to metastatic lesions in the metabolically active organs than 18F-FDG. 11C radionuclide with an ultra-short (20.38 min) half-life is considered safest for PET/CT imaging and does not cause false-positive results in heart imaging. Its combination with aptamers gives us high-specificity and high-contrast imaging of cancer cells and can be applied for PET/CT-guided drug delivery in cancer therapies.
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Affiliation(s)
- Anastasia V. Ozerskaya
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Tatiana N. Zamay
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
| | - Olga S. Kolovskaya
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
| | - Nikolay A. Tokarev
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Kirill V. Belugin
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Natalia G. Chanchikova
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Oleg N. Badmaev
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Galina S. Zamay
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
| | | | - Roman V. Moryachkov
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
- Kirensky Institute of Physics, Krasnoyarsk, Russia
| | | | - Vladimir A. Khorzhevskii
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Krasnoyarsk Regional Pathology-Anatomic Bureau, Krasnoyarsk, Russia
| | - Nikolay Shepelevich
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Stanislav V. Gappoev
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Krasnoyarsk Regional Pathology-Anatomic Bureau, Krasnoyarsk, Russia
| | - Elena A. Karlova
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Anastasia S. Saveleva
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Alexander A. Volzhentsev
- Federal Siberian Research Clinical Centre Under the Federal Medical Biological Agency, Krasnoyarsk, Russia
| | - Anna N. Blagodatova
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
| | - Kirill A. Lukyanenko
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
| | | | - Tatyana E. Smolyarova
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
- Kirensky Institute of Physics, Krasnoyarsk, Russia
| | | | - Sergey S. Zamay
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
| | - Vladimir N. Silnikov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Maxim V. Berezovski
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Canada
| | - Anna S. Kichkailo
- Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Krasnoyarsk, Russia
- Federal Research Center Krasnoyarsk Science- Center SB RAS, Krasnoyarsk, Russia
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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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Schmitz FRW, Valério A, de Oliveira D, Hotza D. An overview and future prospects on aptamers for food safety. Appl Microbiol Biotechnol 2020; 104:6929-6939. [PMID: 32588103 PMCID: PMC7315907 DOI: 10.1007/s00253-020-10747-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 06/10/2020] [Accepted: 06/16/2020] [Indexed: 02/07/2023]
Abstract
Introduction Many bacteria are responsible for infections in humans and plants, being found in vegetables, water, and medical devices. Most bacterial detection methods are time-consuming and take days to give the result. Aptamers are a promising alternative for a quick and reliable measurement technique to detect bacteria present in food products. Selected aptamers are DNA or RNA oligonucleotides that can bind with bacteria or other molecules with affinity and specificity for the target cells by the SELEX or cell-SELEX technique. This method is based on some rounds to remove the non-ligand oligonucleotides, leaving the aptamers specific to bind to the selected bacteria. Compared with conventional methodologies, the detection approach using aptamers is a rapid, low-cost form of analysis. Objective This review summarizes obtention methods and applications of aptamers in the food industry and biotechnology. Besides, different techniques with aptamers are presented, which enable more effective target detection. Conclusion Applications of aptamers as biosensors, or the association of aptamers with nanomaterials, may be employed in analyses by colorimetric, fluorescence, or electrical devices. Additionally, more efficient ways of sample preparation are presented, which can support food safety to provide human health, with a low-cost method for contaminant detection.Key points • Aptamers are promising for detecting contaminants outbreaks. • Studies are needed to identify aptamers for different targets. |
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Affiliation(s)
- Fernanda Raquel Wust Schmitz
- Department of Chemical Engineering and Food Engineering (EQA), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040-900, Brazil
| | - Alexsandra Valério
- Department of Chemical Engineering and Food Engineering (EQA), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040-900, Brazil
| | - Débora de Oliveira
- Department of Chemical Engineering and Food Engineering (EQA), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040-900, Brazil.
| | - Dachamir Hotza
- Department of Chemical Engineering and Food Engineering (EQA), Federal University of Santa Catarina (UFSC), Florianópolis, SC, 88040-900, Brazil
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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: 59] [Impact Index Per Article: 9.8] [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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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.
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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.
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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.
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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.
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dos Santos SR, Rodrigues Corrêa C, Branco de Barros AL, Serakides R, Fernandes SO, Cardoso VN, de Andrade ASR. Identification of Staphylococcus aureus infection by aptamers directly radiolabeled with technetium-99m. Nucl Med Biol 2014; 42:292-8. [PMID: 25533762 DOI: 10.1016/j.nucmedbio.2014.12.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/20/2014] [Accepted: 12/01/2014] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Aptamers are oligonucleotides that have high affinity and specificity for their molecular targets which are emerging as a new class of molecules for radiopharmaceuticals development. In this study, aptamers selected to Staphylococcus aureus were evaluated for bacterial infection identification. METHODS Anti S. aureus aptamers were labeled with (99m)Tc by the direct method. The radiolabel yield and complex stability were assessed by thin-layer chromatography (TLC). Three groups of Swiss mice containing 6 animals each were used. The first group was infected intramuscularly in the right thigh with S. aureus. The second group was infected in the same way with C. albicans and the third group was injected with zymosan to induce aseptic inflammation. After 24 h, radiolabeled aptamers (22.2 MBq) were injected by the tail vein. The mice were euthanized 4 h post injection and tissue sample activities measured in a gamma counter. RESULTS The (99m)Tc labeled aptamers were stable in saline, plasma and cystein excess. Radiolabeled aptamers showed increased uptake in the kidneys for all groups indicating a main renal excretion, which is consistent with the hydrophilic nature and small size of aptamers. The radiopharmaceutical showed rapid blood clearance indicated by a reduced dose (% ID/g) in the blood. The biodistribution showed that aptamers were able to identify the infection foci caused by S. aureus displaying a target/non-target ratio of 4.0±0.5. This ratio for mice infected with C. albicans was 2.0±0.4 while for mice with aseptic inflammation was 1.2±0.2. Histology confirmed the presence of infection in groups 1 and 2, and inflammation in group 3. CONCLUSIONS The biodistibution study demonstrated a statistically higher uptake in the S. aureus foci relative to inflammation and C. albicans infected areas. These results highlight the potential of aptamers labeled directly with (99m)Tc for bacterial infection diagnosis by scintigraphy.
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Affiliation(s)
- 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, Brasil.
| | - Cristiane Rodrigues Corrêa
- Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Rua Professor Mário Werneck S/N°, Cidade Universitária, Campus da UFMG, 31120-970, Belo Horizonte, MG, Brasil.
| | - 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.
| | - Rogéria Serakides
- Departamento de Clinica e Cirurgia, Escola de Veterinária, 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, Brasil.
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Selection of peptidoglycan-specific aptamers for bacterial cells identification. Appl Biochem Biotechnol 2014; 174:2548-56. [PMID: 25185503 DOI: 10.1007/s12010-014-1206-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 08/25/2014] [Indexed: 01/01/2023]
Abstract
Peptidoglycan is a highly complex and essential macromolecule of bacterial outer cell wall; it is a heteropolymer made up of linear glycan strands cross-linked by peptides. Peptidoglycan has a particular composition which makes it a possible target for specific bacterial recognition. Aptamers are single-stranded DNA or RNA oligonucleotides that bind to target molecules with high affinity and specificity. Aptamers can be labeled with different radioisotopes and possess several properties that make them suitable for molecular imaging. The purpose of this study was to obtain aptamers for use as radiopharmaceutical in bacterial infection diagnosis. Two aptamers (Antibac1 and Antibac2) against peptidoglycan were selected through the Systematic Evolution of Ligands by Exponential Enrichment (SELEX) methodology. The dissociation constant (Kd) for Antibac1 was 0.415 + 0.047 μM and for Antibac2 was 1.261 + 0.280 μM. These aptamers labeled with (32)P showed high affinity for Staphylococcus aureus cells. The binding to S. aureus and Escherichia coli in vitro were significantly higher than for Candida albicans and human fibroblasts, demonstrating their specificity for bacterial cells. These results point Antibac1 and Antibac2 as promising tools for bacterial infections identification.
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Sá LTM, Simmons S, Missailidis S, Silva MIPD, Santos-Oliveira R. Aptamer-based nanoparticles for cancer targeting. J Drug Target 2013; 21:427-34. [DOI: 10.3109/1061186x.2012.761222] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Lai YT, DeStefano JJ. DNA aptamers to human immunodeficiency virus reverse transcriptase selected by a primer-free SELEX method: characterization and comparison with other aptamers. Nucleic Acid Ther 2012; 22:162-76. [PMID: 22554064 PMCID: PMC3423876 DOI: 10.1089/nat.2011.0327] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 03/24/2012] [Indexed: 12/17/2022] Open
Abstract
A 30-nucleotide DNA aptamer (5'-AGGAAGGCTTTAGGTCTGAGATCTCGGAAT-3', denoted PF1) selected for high affinity to human immunodeficiency virus reverse transcriptase (HIV RT) using a primer-free SELEX (systematic evolution of ligands by exponential enrichment) method was characterized to determine features promoting tight binding. PF1's equilibrium dissociation constant for RT was ∼80 nM, over 10-fold lower than a random 30-mer. Changing the 2 terminal diguanosine repeats (underlined above) to diadenosine or dithymidine modestly decreased binding. Any changes to the 2 central diguanosines dramatically decreased binding. Binding was highly sensitive to length, with any truncations that deleted part of the 4 diguanosine motifs resulting in a 6-fold or more decrease in affinity. Even a construct with all the diguanosine motifs but lacking the 5' terminal A and 3 nucleotides at the 3' end showed ∼3-fold binding decrease. Changes to the nucleotides between the diguanosines, even those that did not alter PF1's low secondary structure (free energy of folding ΔG=-0.61 kcal/mol), dramatically decreased binding, suggesting sequence specificity. Despite the diguanosine motifs, circular dichroism (CD) spectra indicated that PF1 did not form a G-quartet. PF1 inhibited HIV RT synthesis with a half-maximal inhibitory value (IC(50)) of ∼60 nM. Larger, more structured RT DNA aptamers based on the HIV polypurine tract and those that formed G-quartets (denoted S4 and R1T) were more potent inhibitors, with IC(50) values of ∼4 and ∼1 nM, respectively. An RNA pseudoknot aptamer (denoted 1.1) showed an IC(50) near 4 nM. Competition binding assays with PF1 and several previously characterized RT aptamers indicated that they all bound at or near the primer-template pocket. These other more structured and typically larger aptamers bound more tightly than PF1 to RT based on filter binding assays. Results indicate that PF1 represents a new class of RT aptamers that are relatively small and have very low secondary structure, attributes that could be advantageous for further development as HIV inhibitors.
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Affiliation(s)
- Yi-Tak Lai
- Department of Cell Biology and Molecular Genetics, University of Maryland College Park, College Park, Maryland 20742, USA
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Sá LTM, Pessoa C, Meira AS, da Silva MIP, Missailidis S, Santos-Oliveira R. Development of nanoaptamers using a mesoporous silica model labeled with (99m)tc for cancer targeting. Oncology 2012; 82:213-7. [PMID: 22508189 DOI: 10.1159/000337226] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Accepted: 01/31/2012] [Indexed: 11/19/2022]
Abstract
The use of mesoporous silica in targeted cancer therapy is increasing daily. The combination of a rigid model of nanoparticles like mesoporous silica and biological compounds with an affinity for oncological diseases is the most promising drug-targeting system nowadays. In this study, we used the mesoporous silica SBA-15 combined with aptamer (functionalized for tumor with MUC1). The results obtained were of interest and showed the formation of the silica mesoporous structure. The impregnation methodology of mesoporous silica with the aptamer was also confirmed. Cytotoxicity results demonstrated that the particle associated with the aptamer has no cytotoxicity. We conclude that although further studies are required, the mesoporous silica nanoparticle model loaded with aptamer is very functional and can be used for other applications, especially in nuclear medicine.
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Affiliation(s)
- Lucas Torres Miranda Sá
- Departamento de Química, Pontificia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil
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Aptamer-based radioimmunotherapy: the feasibility and prospect in cancer therapy. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1340-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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A primer-free method that selects high-affinity single-stranded DNA aptamers using thermostable RNA ligase. Anal Biochem 2011; 414:246-53. [PMID: 21420926 DOI: 10.1016/j.ab.2011.03.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 03/11/2011] [Accepted: 03/15/2011] [Indexed: 11/22/2022]
Abstract
This article describes a method for selecting single-stranded DNA (ssDNA) molecules that bind with high-affinity aptamers to specific target proteins. This SELEX (systematic evolution of ligands by exponential enrichment) method is similar to other "primer-free" approaches where the random sequence ssDNA starting pool has no fixed sequences at the 5' and 3' termini. Therefore, there are no predetermined sequences that could bias selection. Like other SELEX methods, repeated cycles (typically 5-15) of selection and then amplification and reselection are used. The method differs from other primer-free approaches in that the key step for regenerating new material for subsequent rounds is ligation of the selected ssDNA to a defined sequence oligonucleotide using thermostable RNA ligase. Under specific conditions, this ligase ligated 30-nt random sequence ssDNA (5'-N(30)-3') to a specified 20-nt ssDNA with approximately 50% efficiency. Efficiency was improved to approximately 90% by the addition of a single T residue to the 3' end (5'-N(29)T-3'). High efficiency in this step is critical, especially early in the procedure because any selected material that is not ligated is lost. In this study, human immunodeficiency virus reverse transcriptase was used as the target protein, but the method could be applied to essentially any protein.
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15
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Molecular diagnostic and drug delivery agents based on aptamer-nanomaterial conjugates. Adv Drug Deliv Rev 2010; 62:592-605. [PMID: 20338204 DOI: 10.1016/j.addr.2010.03.003] [Citation(s) in RCA: 242] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 02/03/2010] [Indexed: 12/16/2022]
Abstract
Recent progress in an emerging area of designing aptamer and nanomaterial conjugates as molecular diagnostic and drug delivery agents in biomedical applications is summarized. Aptamers specific for a wide range of targets are first introduced and compared to antibodies. Methods of integrating these aptamers with a variety of nanomaterials, such as gold nanoparticles, quantum dots, carbon nanotubes, and superparamagnetic iron oxide nanoparticles, each with unique optical, magnetic, and electrochemical properties, are reviewed. Applications of these systems as fluorescent, colorimetric, magnetic resonance imaging, and electrochemical sensors in medical diagnostics are given, along with new applications as smart drug delivery agents.
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Torigoe H, Maruyama A, Obika S, Imanishi T, Katayama T. Synergistic stabilization of nucleic acid assembly by 2'-O,4'-C-methylene-bridged nucleic acid modification and additions of comb-type cationic copolymers. Biochemistry 2009; 48:3545-53. [PMID: 19170613 DOI: 10.1021/bi801795z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Stabilization of nucleic acid assemblies, such as duplex and triplex, is quite important for their wide variety of potential applications. Various stabilization methods, including molecular designs of chemically modified nucleotides and hybrid stabilizers, and combinations of different stabilization methods have been developed to increase stability of nucleic acid assemblies. However, combinations of two stabilizing methods have not always yielded desired synergistic effects. In the present study, to propose a strategy for selection of a rational combination of stabilizing methods, we demonstrate synergistic stabilization of triplex by 2'-O,4'-C-methylene-bridged nucleic acid (2',4'-BNA) modification of triplex-forming oligonucleotide and addition of poly(l-lysine)-graft-dextran copolymer [poly(l-lysine) grafted with hydrophilic dextran side chains]. Each of these methods increased the binding constant for triplex formation by nearly 2 orders of magnitude. However, their kinetic contributions were quite distinct. The copolymer increased the association rate constant, whereas the 2',4'-BNA modification decreased the dissociation rate constant for triplex stabilization. The combination of both stabilizing methods increased the binding constant by nearly 4 orders of magnitude. Kinetic analyses revealed that the successful synergistic stabilization resulted from kinetic complementarity between increased association rate constants by the copolymer and decreased dissociation rate constants by the 2',4'-BNA modification. The stabilizing effect of one stabilization method did not alter that of the other stabilization method. We propose that kinetic analyses of each stabilizing effect permit selection of a rational combination of stabilizing methods for successful synergy in stabilizing nucleic acid assemblies.
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Affiliation(s)
- Hidetaka Torigoe
- Department of Applied Chemistry, Faculty of Science, Tokyo UniVersity of Science, 1-3 Kagurazaka,Shinjuku-ku, Tokyo 162-8601, Japan.
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Pan D, Lanza GM, Wickline SA, Caruthers SD. Nanomedicine: perspective and promises with ligand-directed molecular imaging. Eur J Radiol 2009; 70:274-85. [PMID: 19268515 DOI: 10.1016/j.ejrad.2009.01.042] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Accepted: 01/14/2009] [Indexed: 01/01/2023]
Abstract
Molecular imaging and targeted drug delivery play an important role toward personalized medicine, which is the future of patient management. Of late, nanoparticle-based molecular imaging has emerged as an interdisciplinary area, which shows promises to understand the components, processes, dynamics and therapies of a disease at a molecular level. The unprecedented potential of nanoplatforms for early detection, diagnosis and personalized treatment of diseases, have found application in every biomedical imaging modality. Biological and biophysical barriers are overcome by the integration of targeting ligands, imaging agents and therapeutics into the nanoplatform which allow for theranostic applications. In this article, we have discussed the opportunities and potential of targeted molecular imaging with various modalities putting a particular emphasis on perfluorocarbon nanoemulsion-based platform technology.
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Affiliation(s)
- Dipanjan Pan
- Department of Medicine, Washington University Medical School, St Louis, MO, USA.
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DeNardo GL, DeNardo SJ, Balhorn R. Systemic radiotherapy can cure lymphoma: a paradigm for other malignancies? Cancer Biother Radiopharm 2008; 23:383-97. [PMID: 18771343 DOI: 10.1089/cbr.2007.0523-u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The cytocidal potency of a molecule can be augmented by conjugating a radionuclide for molecular targeted radionuclide therapy (MTRT) for cancer. Radioimmunotherapy (RIT) should be incorporated into the management of patients with B-cell non-Hodgkin's lymphoma (NHL) soon after the patients have proven incurable. Better drugs, strategies, and combinations with other drugs seem certain to make RIT integral to the management of patients with NHL and likely to lead to a cure of the currently incurable NHL. These improved drugs, strategies, and combinations thereof also offer opportunities for RIT to become part of the management of solid malignancies, including epithelial cancers. Smaller radionuclide carriers, such as those used for pretargeted strategies, provide dose intensification. The potential of pretargeted RIT to improve patient outcomes is striking.
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Affiliation(s)
- Gerald L DeNardo
- Department of Internal Medicine, University of California, Davis, Sacramento, CA 95816, USA.
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Pai S, Roberts A, Ellington AD. Aptamer amplification: divide and signal. ACTA ACUST UNITED AC 2008; 2:1333-46. [DOI: 10.1517/17530050802562016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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