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      International Journal of Nanomedicine (submit here)

      This international, peer-reviewed Open Access journal by Dove Medical Press focuses on the application of nanotechnology in diagnostics, therapeutics, and drug delivery systems throughout the biomedical field. Sign up for email alerts here.

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      Aptamer Hybrid Nanocomplexes as Targeting Components for Antibiotic/Gene Delivery Systems and Diagnostics: A Review

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          Abstract

          With the passage of time and more advanced societies, there is a greater emergence and incidence of disease and necessity for improved treatments. In this respect, nowadays, aptamers, with their better efficiency at diagnosing and treating diseases than antibodies, are at the center of attention. Here, in this review, we first investigate aptamer function in various fields (such as the detection and remedy of pathogens, modification of nanoparticles, antibiotic delivery and gene delivery). Then, we present aptamer-conjugated nanocomplexes as the main and efficient factor in gene delivery. Finally, we focus on the targeted co-delivery of genes and drugs by nanocomplexes, as a new exciting approach for cancer treatment in the decades ahead to meet our growing societal needs.

          Most cited references121

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          SELEX--a (r)evolutionary method to generate high-affinity nucleic acid ligands.

          SELEX stands for systematic evolution of ligands by exponential enrichment. This method, described primarily in 1990 [Ellington, A.D., Szostak, J.W., 1990. In vitro selection of RNA molecules that bind specific ligands. Nature 346, 818-822; Tuerk, C., Gold, L., 1990. Systematic evolution of ligands by exponential enrichment: RNA ligands to bacteriophage T4 DNA polymerase. Science 249, 505-510] aims at the development of aptamers, which are oligonucleotides (RNA or ssDNA) binding to their target with high selectivity and sensitivity because of their three-dimensional shape. Aptamers are all new ligands with a high affinity for considerably differing molecules ranging from large targets as proteins over peptides, complex molecules to drugs and organic small molecules or even metal ions. Aptamers are widely used, including medical and pharmaceutical basic research, drug development, diagnosis, and therapy. Analytical and separation tools bearing aptamers as molecular recognition and binding elements are another big field of application. Moreover, aptamers are used for the investigation of binding phenomena in proteomics. The SELEX method was modified over the years in different ways to become more efficient and less time consuming, to reach higher affinities of the aptamers selected and for automation of the process. This review is focused on the development of aptamers by use of SELEX and gives an overview about technologies, advantages, limitations, and applications of aptamers.
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            Current approaches in SELEX: An update to aptamer selection technology.

            Systematic evolution of ligands by exponential enrichment (SELEX) is a well-established and efficient technology for the generation of oligonucleotides with a high target affinity. These SELEX-derived single stranded DNA and RNA molecules, called aptamers, were selected against various targets, such as proteins, cells, microorganisms, chemical compounds etc. They have a great potential in the use as novel antibodies, in cancer theragnostics and in biomedical research. Vast interest in aptamers stimulated continuous development of SELEX, which underwent numerous modifications since its first application in 1990. Novel modifications made the selection process more efficient, cost-effective and significantly less time-consuming. This article brings a comprehensive and up-to-date review of recent advances in SELEX methods and pinpoints advantages, main obstacles and limitations. The post-SELEX strategies and examples of application are also briefly outlined in this review.
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              Oligonucleotide Aptamers: New Tools for Targeted Cancer Therapy

              Aptamers are a class of small nucleic acid ligands that are composed of RNA or single-stranded DNA oligonucleotides and have high specificity and affinity for their targets. Similar to antibodies, aptamers interact with their targets by recognizing a specific three-dimensional structure and are thus termed “chemical antibodies.” In contrast to protein antibodies, aptamers offer unique chemical and biological characteristics based on their oligonucleotide properties. Hence, they are more suitable for the development of novel clinical applications. Aptamer technology has been widely investigated in various biomedical fields for biomarker discovery, in vitro diagnosis, in vivo imaging, and targeted therapy. This review will discuss the potential applications of aptamer technology as a new tool for targeted cancer therapy with emphasis on the development of aptamers that are able to specifically target cell surface biomarkers. Additionally, we will describe several approaches for the use of aptamers in targeted therapeutics, including aptamer-drug conjugation, aptamer-nanoparticle conjugation, aptamer-mediated targeted gene therapy, aptamer-mediated immunotherapy, and aptamer-mediated biotherapy.
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                Author and article information

                Journal
                Int J Nanomedicine
                Int J Nanomedicine
                IJN
                intjnano
                International Journal of Nanomedicine
                Dove
                1176-9114
                1178-2013
                17 June 2020
                2020
                : 15
                : 4237-4256
                Affiliations
                [1 ]Department of Chemistry, Sharif University of Technology , Tehran, Iran
                [2 ]Student Research Committee, Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences , Tehran, Iran
                [3 ]Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences , Tehran, Iran
                [4 ]Chemical Engineering Department and Bioengineering Division, Hacettepe University , Beytepe, Ankara 06800, Turkey
                [5 ]Chemical Engineering and Applied Chemistry Department, Atilim University , Ankara, Turkey
                [6 ]Biomaterial Group, Department of Biomedical Engineering, Amirkabir University of Technology , Tehran, Iran
                [7 ]Marquette University School of Dentistry , Milwaukee, WI 53233, USA
                [8 ]Department of Chemical Engineering, Northeastern University , Boston, MA 02115, USA
                Author notes
                Correspondence: Thomas J Webster; Mohammadreza Tahriri Email th.webster@neu.edu; Mohammadreza.tahriri@marquette.edu
                Author information
                http://orcid.org/0000-0002-6945-8541
                http://orcid.org/0000-0002-8806-3924
                http://orcid.org/0000-0002-2028-5969
                http://orcid.org/0000-0003-1947-5658
                Article
                248736
                10.2147/IJN.S248736
                7314593
                4f1702d4-f7b7-4fa3-bc0b-73ecf4fbd291
                © 2020 Rabiee et al.

                This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms ( https://www.dovepress.com/terms.php).

                History
                : 07 February 2020
                : 01 April 2020
                Page count
                Figures: 6, Tables: 3, References: 139, Pages: 20
                Categories
                Review

                Molecular medicine
                aptamer,polyethyleneimine,hybrid nanocomplexes,antibiotic,targeting,gene delivery systems

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