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Antisense oligonucleotide (ASO) therapies for central nervous system (CNS) indications have advanced significantly within the past three years, including FDA approval for an ASO therapy for spinal muscular atrophy and clinical trials for several other neurological disorders. ASOs are ~6-8 kDa, single-stranded DNA or RNA oligomers and are attractive therapeutic candidates for diseases caused by known genetic abnormalities because they are disease-modifying therapeutics that can interact with target RNA to modify protein production. ASOs are unable to cross the blood-brain barrier on their own, so they are administered centrally, typically achieved by intrathecal administration. Despite the clinical use of CSF-administered ASOs, there is a paucity of knowledge concerning CSF-to-brain transport mechanisms and the resulting CNS biodistribution. Here, we investigated ASO transport and distribution in the CNS following intrathecal administration, focusing on the effects of different ASO chemistries and two transport mechanisms: diffusion in the extracellular spaces and convection/dispersion in perivascular spaces (PVS) surrounding the cerebral vasculature. We have demonstrated that intrathecal administration of fluorescently-labeled ASOs in rats leads to limited diffusion at CSF-brain and CSF-spinal cord interfaces and rapid distribution within the PVS. ASOs distributed to the PVS surrounding vessels of all type and caliber. We have also demonstrated that the extent to which perivascular distribution occurs differs in a sequence- and chemical modification-specific manner, a finding not yet reported in the literature. Furthermore, we have found that ASOs with a nucleotide sequence that allowed a random coil conformation had a significantly smaller hydrodynamic size compared to ASOs that formed secondary structures and that smaller hydrodynamic size correlated with more extensive diffusion and perivascular access. The difference in perivascular signal between the PS-ASO and the 2'MOE-ASO was significant when quantified and was particularly apparent in the dorsal cortex as well as in subcortical brain regions such as the striatum and hippocampus. Biodistribution and transport studies such as those conducted in the present work may provide an improved framework for understanding ASO delivery to brain and spinal cord targets. It is our hope that this framework may assist in developing ASO therapies for optimal CNS distribution to improve treatment results for devastating neurological conditions.
This book provides a compelling overall update on current status of RNA interference
A comprehensive review of contemporary antisense oligonucleotides drugs and therapeutic principles, methods, applications, and research Oligonucleotide-based drugs, in particular antisense oligonucleotides, are part of a growing number of pharmaceutical and biotech programs progressing to treat a wide range of indications including cancer, cardiovascular, neurodegenerative, neuromuscular, and respiratory diseases, as well as other severe and rare diseases. Reviewing fundamentals and offering guidelines for drug discovery and development, this book is a practical guide covering all key aspects of this increasingly popular area of pharmacology and biotech and pharma research, from the basic science behind antisense oligonucleotides chemistry, toxicology, manufacturing, to safety assessments, the design of therapeutic protocols, to clinical experience. Antisense oligonucleotides are single strands of DNA or RNA that are complementary to a chosen sequence. While the idea of antisense oligonucleotides to target single genes dates back to the 1970's, most advances have taken place in recent years. The increasing number of antisense oligonucleotide programs in clinical development is a testament to the progress and understanding of pharmacologic, pharmacokinetic, and toxicologic properties as well as improvement in the delivery of oligonucleotides. This valuable book reviews the fundamentals of oligonucleotides, with a focus on antisense oligonucleotide drugs, and reports on the latest research underway worldwide. • Helps readers understand antisense molecules and their targets, biochemistry, and toxicity mechanisms, roles in disease, and applications for safety and therapeutics • Examines the principles, practices, and tools for scientists in both pre-clinical and clinical settings and how to apply them to antisense oligonucleotides • Provides guidelines for scientists in drug design and discovery to help improve efficiency, assessment, and the success of drug candidates • Includes interdisciplinary perspectives, from academia, industry, regulatory and from the fields of pharmacology, toxicology, biology, and medicinal chemistry Oligonucleotide-Based Drugs and Therapeutics belongs on the reference shelves of chemists, pharmaceutical scientists, chemical biologists, toxicologists and other scientists working in the pharmaceutical and biotechnology industries. It will also be a valuable resource for regulatory specialists and safety assessment professionals and an important reference for academic researchers and post-graduates interested in therapeutics, antisense therapy, and oligonucleotides.
With contributions from leading experts, this book is the first to focus solely on addressing the problems and reviewing the strategies currently being used to improve the delivery of antisense nucleic acids. Important delivery issues, such as improving biological stability, improving cell-specific targeting and cellular uptake, manipulating subcellular distribution and producing liposomal delivery systems for antisense agents are comprehensively covered in this volume. This book links review-type articles with contributions that contain exciting never-before-published data on the cellular delivery of oligonucleotides. It stimulates reading for both established researchers and newcomers to the antisense field.
A comprehensive review of contemporary antisense oligonucleotides drugs and therapeutic principles, methods, applications, and research Oligonucleotide-based drugs, in particular antisense oligonucleotides, are part of a growing number of pharmaceutical and biotech programs progressing to treat a wide range of indications including cancer, cardiovascular, neurodegenerative, neuromuscular, and respiratory diseases, as well as other severe and rare diseases. Reviewing fundamentals and offering guidelines for drug discovery and development, this book is a practical guide covering all key aspects of this increasingly popular area of pharmacology and biotech and pharma research, from the basic science behind antisense oligonucleotides chemistry, toxicology, manufacturing, to safety assessments, the design of therapeutic protocols, to clinical experience. Antisense oligonucleotides are single strands of DNA or RNA that are complementary to a chosen sequence. While the idea of antisense oligonucleotides to target single genes dates back to the 1970's, most advances have taken place in recent years. The increasing number of antisense oligonucleotide programs in clinical development is a testament to the progress and understanding of pharmacologic, pharmacokinetic, and toxicologic properties as well as improvement in the delivery of oligonucleotides. This valuable book reviews the fundamentals of oligonucleotides, with a focus on antisense oligonucleotide drugs, and reports on the latest research underway worldwide. • Helps readers understand antisense molecules and their targets, biochemistry, and toxicity mechanisms, roles in disease, and applications for safety and therapeutics • Examines the principles, practices, and tools for scientists in both pre-clinical and clinical settings and how to apply them to antisense oligonucleotides • Provides guidelines for scientists in drug design and discovery to help improve efficiency, assessment, and the success of drug candidates • Includes interdisciplinary perspectives, from academia, industry, regulatory and from the fields of pharmacology, toxicology, biology, and medicinal chemistry Oligonucleotide-Based Drugs and Therapeutics belongs on the reference shelves of chemists, pharmaceutical scientists, chemical biologists, toxicologists and other scientists working in the pharmaceutical and biotechnology industries. It will also be a valuable resource for regulatory specialists and safety assessment professionals and an important reference for academic researchers and post-graduates interested in therapeutics, antisense therapy, and oligonucleotides.
This book presents a comprehensive collection of detailed state-of-the-art exon skipping and splices modulation protocols. Chapters detail 14 genetic diseases, AON-mediated therapies, and CRISPR/Cas9-mediated gene editing therapies. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Exon Skipping and Inclusion Therapies: Methods and Protocols aims to help researchers initiate the development of next-generation therapies.
This book provides a cutting-edge review of polyglutamine disorders. It primarily focuses on two main aspects: (1) the mechanisms underlying the pathologies’ development and progression, and (2) the therapeutic strategies that are currently being explored to stop or delay disease progression. Polyglutamine (polyQ) disorders are a group of inherited neurodegenerative diseases with a fatal outcome that are caused by an abnormal expansion of a coding trinucleotide repeat (CAG), which is then translated in an abnormal protein with an elongated glutamine tract (Q). To date, nine polyQ disorders have been identified and described: dentatorubral-pallidoluysian atrophy (DRPLA); Huntington’s disease (HD); spinal–bulbar muscular atrophy (SBMA); and six spinocerebellar ataxias (SCA 1, 2, 3, 6, 7, and 17). The genetic basis of polyQ disorders is well established and described, and despite important advances that have opened up the possibility of generating genetic models of the disease, the mechanisms that cause neuronal degeneration are still largely unknown and there is currently no treatment available for these disorders. Further, it is believed that the different polyQ may share some mechanisms and pathways contributing to neurodegeneration and disease progression.
This open access volume gathers a variety of models, delivery systems, and approaches that can be used to assess RNA technology for exploiting antisense as a therapeutic intervention. Beginning with a section on the design of antisense technology and their delivery, the book continues by covering model systems developed to evaluate efficacy, both in vivo and in vitro, as well as methods to evaluate preclinically the toxicity associated with these new potential drugs, and intellectual property considerations. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Antisense RNA Design, Delivery, and Analysis provides basic knowledge and a large collection of methods to facilitate the work of newcomers to this vibrant and expanding field. This book was conceived thanks to the network DARTER (Delivery of Antisense RNA Therapeutics). DARTER is funded by the EU Cooperation of Science and Technology (COST), which aims to enhance interaction and collaborations between researchers in Europe and other countries.
Extensively revised and updated, Antisense Drug Technology: Principles, Strategies, and Applications, Second Edition reflects the logarithmic progress made in the past four years of oligonucleotide-based therapies, and, in particular, antisense therapeutics and research. Interpreting lessons learned from the clinical trials of first generati
This book provides a collection of comprehensive, up-to-date, and broadly applicable guides to the research and development fields of oligonucleotide (ON) therapeutics. Covering topics from the study of antisense and anti-gene effects to oligonucleotides in the context of drug discovery and development, the volume explores a wide-ranging and useful spectrum of methods and protocols needed to take full advantage of therapeutic applications involving ONs. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Oligonucleotide-Based Therapies: Methods and Protocols aims to be a great aid in the laboratory as well as an ideal reference guide when designing antisense and anti-gene oligonucleotides for therapeutic applications.