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Chaiyawat P, Sangkhathat S, Chiangjong W, Wongtrakoongate P, Hongeng S, Pruksakorn D, Chutipongtanate S. Targeting pediatric solid tumors in the new era of RNA therapeutics. Crit Rev Oncol Hematol 2024; 200:104406. [PMID: 38834094 DOI: 10.1016/j.critrevonc.2024.104406] [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: 07/31/2023] [Revised: 04/26/2024] [Accepted: 05/29/2024] [Indexed: 06/06/2024] Open
Abstract
Despite substantial progress in pediatric cancer treatment, poor prognosis remained for patients with recurrent or metastatic disease, given the limitations of approved targeted treatments and immunotherapies. RNA therapeutics offer significant potential for addressing a broad spectrum of diseases, including cancer. Advances in manufacturing and delivery systems are paving the way for the rapid development of therapeutic RNAs for clinical applications. This review summarizes therapeutic RNA classifications and the mechanisms of action, highlighting their potential in manipulating major cancer-related pathways and biological effects. We also focus on the pre-clinical investigation of RNA molecules with efficient delivery systems for their therapeutic potential targeting pediatric solid tumors.
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Affiliation(s)
- Parunya Chaiyawat
- Musculoskeletal Science and Translational Research Center, Department of Orthopedics, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Center of Multidisciplinary Technology for Advanced Medicine (CMUTEAM), Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Surasak Sangkhathat
- Department of Biomedical Science, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand; Department of Surgery, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Wararat Chiangjong
- Pediatric Translational Research Unit, Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Patompon Wongtrakoongate
- Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Suradej Hongeng
- Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine Ra-mathibodi Hospital, Mahidol University, Bangkok 10400, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Dumnoensun Pruksakorn
- Musculoskeletal Science and Translational Research Center, Department of Orthopedics, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Center of Multidisciplinary Technology for Advanced Medicine (CMUTEAM), Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
| | - Somchai Chutipongtanate
- Pediatric Translational Research Unit, Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand; Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine Ra-mathibodi Hospital, Mahidol University, Bangkok 10400, Thailand; MILCH and Novel Therapeutics Lab, Division of Epidemiology, Department of Environmental and Public Health Sciences, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA; Extracellular Vesicle Working Group, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
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2
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Li W(J, Wang Y, Liu X, Wu S, Wang M, Turowski SG, Spernyak JA, Tracz A, Abdelaal AM, Sudarshan K, Puzanov I, Chatta G, Kasinski AL, Tang DG. Developing Folate-Conjugated miR-34a Therapeutic for Prostate Cancer: Challenges and Promises. Int J Mol Sci 2024; 25:2123. [PMID: 38396800 PMCID: PMC10888849 DOI: 10.3390/ijms25042123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 01/30/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
Prostate cancer (PCa) remains a common cancer with high mortality in men due to its heterogeneity and the emergence of drug resistance. A critical factor contributing to its lethality is the presence of prostate cancer stem cells (PCSCs), which can self-renew, long-term propagate tumors, and mediate treatment resistance. MicroRNA-34a (miR-34a) has shown promise as an anti-PCSC therapeutic by targeting critical molecules involved in cancer stem cell (CSC) survival and functions. Despite extensive efforts, the development of miR-34a therapeutics still faces challenges, including non-specific delivery and delivery-associated toxicity. One emerging delivery approach is ligand-mediated conjugation, aiming to achieve specific delivery of miR-34a to cancer cells, thereby enhancing efficacy while minimizing toxicity. Folate-conjugated miR-34a (folate-miR-34a) has demonstrated promising anti-tumor efficacy in breast and lung cancers by targeting folate receptor α (FOLR1). Here, we first show that miR-34a, a TP53 transcriptional target, is reduced in PCa that harbors TP53 loss or mutations and that miR-34a mimic, when transfected into PCa cells, downregulated multiple miR-34a targets and inhibited cell growth. When exploring the therapeutic potential of folate-miR-34a, we found that folate-miR-34a exhibited impressive inhibitory effects on breast, ovarian, and cervical cancer cells but showed minimal effects on and targeted delivery to PCa cells due to a lack of appreciable expression of FOLR1 in PCa cells. Folate-miR-34a also did not display any apparent effect on PCa cells expressing prostate-specific membrane antigen (PMSA) despite the reported folate's binding capability to PSMA. These results highlight challenges in the specific delivery of folate-miR-34a to PCa due to a lack of target (receptor) expression. Our study offers novel insights into the challenges and promises within the field and casts light on the development of ligand-conjugated miR-34a therapeutics for PCa.
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Affiliation(s)
- Wen (Jess) Li
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
- Experimental Therapeutics (ET) Graduate Program, Roswell Park Comprehensive Cancer Center and the University at Buffalo, Buffalo, NY 14263, USA
| | - Yunfei Wang
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
| | - Xiaozhuo Liu
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
| | - Shan Wu
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
| | - Moyi Wang
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
| | - Steven G. Turowski
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Joseph A. Spernyak
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Amanda Tracz
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
| | - Ahmed M. Abdelaal
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Kasireddy Sudarshan
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Igor Puzanov
- Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Gurkamal Chatta
- Department of Medicine, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA
| | - Andrea L. Kasinski
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Dean G. Tang
- Department of Pharmacology and Therapeutics, Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA; (Y.W.); (X.L.); (S.W.); (M.W.)
- Experimental Therapeutics (ET) Graduate Program, Roswell Park Comprehensive Cancer Center and the University at Buffalo, Buffalo, NY 14263, USA
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3
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Li WJ, Wang Y, Liu X, Wu S, Wang M, Turowski SG, Spernyak JA, Tracz A, Abdelaal AM, Sudarshan K, Puzanov I, Chatta G, Kasinski AL, Tang DG. Developing folate-conjugated miR-34a therapeutic for prostate cancer treatment: Challenges and promises. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.11.25.568612. [PMID: 38045265 PMCID: PMC10690264 DOI: 10.1101/2023.11.25.568612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Prostate cancer (PCa) remains a common cancer with high mortality in men due to its heterogeneity and the emergence of drug resistance. A critical factor contributing to its lethality is the presence of prostate cancer stem cells (PCSCs), which can self-renew, long-term propagate tumors and mediate treatment resistance. MicroRNA-34a (miR-34a) has shown promise as an anti-PCSC therapeutic by targeting critical molecules involved in cancer stem cell (CSC) survival and functions. Despite extensive efforts, the development of miR-34a therapeutics still faces challenges, including non-specific delivery and delivery-associated toxicity. One emerging delivery approach is ligand-mediated conjugation, aiming to achieve specific delivery of miR-34a to cancer cells, thereby enhancing efficacy while minimizing toxicity. Folate-conjugated miR-34a (folate-miR-34a) has demonstrated promising anti-tumor efficacy in breast and lung cancers by targeting folate receptor α (FOLR1). Here, we first show that miR-34a, a TP53 transcriptional target, is reduced in PCa that harbors TP53 loss or mutations and that miR-34a mimic, when transfected into PCa cells, downregulated multiple miR-34a targets and inhibited cell growth. When exploring the therapeutic potential of folate-miR-34a, we found that folate-miR-34a exhibited impressive inhibitory effects on breast, ovarian and cervical cancer cells but showed minimal effects on and targeted delivery to PCa cells due to a lack of appreciable expression of FOLR1 in PCa cells. Folate-miR-34a also did not display any apparent effect on PCa cells expressing prostate-specific membrane antigen (PMSA) despite the reported folate's binding capability to PSMA. These results highlight challenges in specific delivery of folate-miR-34a to PCa due to lack of target (receptor) expression. Our study offers novel insights on the challenges and promises within the field and cast light on the development of ligand-conjugated miR-34a therapeutics for PCa.
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Xiao H, Amarsaikhan O, Zhao Y, Yu X, Hu X, Han S, Chaolumen, Baigude H. Astrocyte-targeted siRNA delivery by adenosine-functionalized LNP in mouse TBI model. MOLECULAR THERAPY. NUCLEIC ACIDS 2023; 34:102065. [PMID: 38028196 PMCID: PMC10661454 DOI: 10.1016/j.omtn.2023.102065] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 10/18/2023] [Indexed: 12/01/2023]
Abstract
Traumatic brain injury (TBI) induces pro-inflammatory polarization of astrocytes and causes secondary disruption of the blood-brain barrier (BBB) and brain damage. Herein, we report a successful astrocyte-targeted delivery of small interfering RNA (siRNA) by ligand functionalized lipid nanoparticles (LNPs) formulated from adenosine-conjugated lipids and a novel ionizable lipid (denoted by Ad4 LNPs). Systemic administration of Ad4 LNPs carrying siRNA against TLR4 to the mice TBI model resulted in the specific internalization of the LNPs by astrocytes in the vicinity of damaged brain tissue. A substantial knockdown of TLR4 at both mRNA and protein levels in the brain was observed, which led to a significant decrease of key pro-inflammatory cytokines and an increase of key anti-inflammatory cytokines in serum. Dye leakage measurement suggested that the Ad4-LNP-mediated knockdown of TLR4 attenuated the TBI-induced BBB disruption. Together, our data suggest that Ad4 LNP is a promising vehicle for astrocyte-specific delivery of nucleic acid therapeutics.
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Affiliation(s)
- Hai Xiao
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Odmaa Amarsaikhan
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Yunwang Zhao
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Xiang Yu
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Xin Hu
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Shuqin Han
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Chaolumen
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
| | - Huricha Baigude
- Inner Mongolia Key Laboratory of Mongolian Medicinal Chemistry, School of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010020, P.R. China
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Baba SK, Baba SK, Mir R, Elfaki I, Algehainy N, Ullah MF, Barnawi J, Altemani FH, Alanazi M, Mustafa SK, Masoodi T, Akil ASA, Bhat AA, Macha MA. Long non-coding RNAs modulate tumor microenvironment to promote metastasis: novel avenue for therapeutic intervention. Front Cell Dev Biol 2023; 11:1164301. [PMID: 37384249 PMCID: PMC10299194 DOI: 10.3389/fcell.2023.1164301] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/22/2023] [Indexed: 06/30/2023] Open
Abstract
Cancer is a devastating disease and the primary cause of morbidity and mortality worldwide, with cancer metastasis responsible for 90% of cancer-related deaths. Cancer metastasis is a multistep process characterized by spreading of cancer cells from the primary tumor and acquiring molecular and phenotypic changes that enable them to expand and colonize in distant organs. Despite recent advancements, the underlying molecular mechanism(s) of cancer metastasis is limited and requires further exploration. In addition to genetic alterations, epigenetic changes have been demonstrated to play an important role in the development of cancer metastasis. Long non-coding RNAs (lncRNAs) are considered one of the most critical epigenetic regulators. By regulating signaling pathways and acting as decoys, guides, and scaffolds, they modulate key molecules in every step of cancer metastasis such as dissemination of carcinoma cells, intravascular transit, and metastatic colonization. Gaining a good knowledge of the detailed molecular basis underlying lncRNAs regulating cancer metastasis may provide previously unknown therapeutic and diagnostic lncRNAs for patients with metastatic disease. In this review, we concentrate on the molecular mechanisms underlying lncRNAs in the regulation of cancer metastasis, the cross-talk with metabolic reprogramming, modulating cancer cell anoikis resistance, influencing metastatic microenvironment, and the interaction with pre-metastatic niche formation. In addition, we also discuss the clinical utility and therapeutic potential of lncRNAs for cancer treatment. Finally, we also represent areas for future research in this rapidly developing field.
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Affiliation(s)
- Sana Khurshid Baba
- Watson-Crick Centre for Molecular Medicine, Islamic University of Science and Technology, Awantipora, Kashmir, India
| | - Sadaf Khursheed Baba
- Department of Microbiology, Sher-I-Kashmir Institute of Medical Science (SKIMS), Soura, Kashmir, India
| | - Rashid Mir
- Department of Medical Lab Technology, Prince Fahd Bin Sultan Research Chair Faculty of Applied Medical Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Imadeldin Elfaki
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Naseh Algehainy
- Department of Medical Lab Technology, Prince Fahd Bin Sultan Research Chair Faculty of Applied Medical Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Mohammad Fahad Ullah
- Department of Medical Lab Technology, Prince Fahd Bin Sultan Research Chair Faculty of Applied Medical Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Jameel Barnawi
- Department of Medical Lab Technology, Prince Fahd Bin Sultan Research Chair Faculty of Applied Medical Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Faisal H. Altemani
- Department of Medical Lab Technology, Prince Fahd Bin Sultan Research Chair Faculty of Applied Medical Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Mohammad Alanazi
- Department of Biochemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Syed Khalid Mustafa
- Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Tariq Masoodi
- Human Immunology Department, Research Branch, Sidra Medicine, Doha, Qatar
| | - Ammira S. Alshabeeb Akil
- Department of Human Genetics-Precision Medicine in Diabetes, Obesity, and Cancer Program, Sidra Medicine, Doha, Qatar
| | - Ajaz A. Bhat
- Department of Human Genetics-Precision Medicine in Diabetes, Obesity, and Cancer Program, Sidra Medicine, Doha, Qatar
| | - Muzafar A. Macha
- Watson-Crick Centre for Molecular Medicine, Islamic University of Science and Technology, Awantipora, Kashmir, India
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Shmendel EV, Puchkov PA, Maslov MA. Design of Folate-Containing Liposomal Nucleic Acid Delivery Systems for Antitumor Therapy. Pharmaceutics 2023; 15:pharmaceutics15051400. [PMID: 37242642 DOI: 10.3390/pharmaceutics15051400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/28/2023] [Accepted: 05/02/2023] [Indexed: 05/28/2023] Open
Abstract
The delivery of therapeutic nucleic acids is a prospective method for the treatment of both inherited and acquired diseases including cancer. To achieve maximal delivery efficiency and selectivity, nucleic acids should be targeted to the cells of interest. In the case of cancer, such targeting may be provided through folate receptors overexpressed in many tumor cells. For this purpose, folic acid and its lipoconjugates are used. Compared to other targeting ligands, folic acid provides low immunogenicity, rapid tumor penetration, high affinity to a wide range of tumors, chemical stability, and easy production. Different delivery systems can utilize targeting by folate ligand including liposomal forms of anticancer drugs, viruses, and lipid and polymer nanoparticles. This review focuses on the liposomal gene delivery systems that provide targeted nucleic acid transport into tumor cells due to folate lipoconjugates. Moreover, important development step, such as rational design of lipoconjugates, folic acid content, size, and ζ-potential of lipoplexes are discussed.
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Affiliation(s)
- Elena V Shmendel
- Lomonosov Institute of Fine Chemical Technologies, MIREA-Russian Technological University, Vernadsky Ave. 86, 119571 Moscow, Russia
| | - Pavel A Puchkov
- Lomonosov Institute of Fine Chemical Technologies, MIREA-Russian Technological University, Vernadsky Ave. 86, 119571 Moscow, Russia
| | - Michael A Maslov
- Lomonosov Institute of Fine Chemical Technologies, MIREA-Russian Technological University, Vernadsky Ave. 86, 119571 Moscow, Russia
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Noncoding RNAs Emerging as Drugs or Drug Targets: Their Chemical Modification, Bio-Conjugation and Intracellular Regulation. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27196717. [PMID: 36235253 PMCID: PMC9573214 DOI: 10.3390/molecules27196717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/06/2022] [Accepted: 10/07/2022] [Indexed: 11/07/2022]
Abstract
With the increasing understanding of various disease-related noncoding RNAs, ncRNAs are emerging as novel drugs and drug targets. Nucleic acid drugs based on different types of noncoding RNAs have been designed and tested. Chemical modification has been applied to noncoding RNAs such as siRNA or miRNA to increase the resistance to degradation with minimum influence on their biological function. Chemical biological methods have also been developed to regulate relevant noncoding RNAs in the occurrence of various diseases. New strategies such as designing ribonuclease targeting chimeras to degrade endogenous noncoding RNAs are emerging as promising approaches to regulate gene expressions, serving as next-generation drugs. This review summarized the current state of noncoding RNA-based theranostics, major chemical modifications of noncoding RNAs to develop nucleic acid drugs, conjugation of RNA with different functional biomolecules as well as design and screening of potential molecules to regulate the expression or activity of endogenous noncoding RNAs for drug development. Finally, strategies of improving the delivery of noncoding RNAs are discussed.
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MicroRNA-34a, Prostate Cancer Stem Cells, and Therapeutic Development. Cancers (Basel) 2022; 14:cancers14184538. [PMID: 36139695 PMCID: PMC9497236 DOI: 10.3390/cancers14184538] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/12/2022] [Accepted: 09/16/2022] [Indexed: 11/17/2022] Open
Abstract
Prostate cancer (PCa) is a highly heterogeneous disease and typically presents with multiple distinct cancer foci. Heterogeneity in androgen receptor (AR) expression levels in PCa has been observed for decades, from untreated tumors to castration-resistant prostate cancer (CRPC) to disseminated metastases. Current standard-of-care therapies for metastatic CRPC can only extend life by a few months. Cancer stem cells (CSCs) are defined as a subpopulation of cancer cells that exists in almost all treatment-naive tumors. Additionally, non-CSCs may undergo cellular plasticity to be reprogrammed to prostate cancer stem cells (PCSCs) during spontaneous tumor progression or upon therapeutic treatments. Consequently, PCSCs may become the predominant population in treatment-resistant tumors, and the "root cause" for drug resistance. microRNA-34a (miR-34a) is a bona fide tumor-suppressive miRNA, and its expression is dysregulated in PCa. Importantly, miR-34a functions as a potent CSC suppressor by targeting many molecules essential for CSC survival and functions, which makes it a promising anti-PCSC therapeutic. Here, we conducted a comprehensive literature survey of miR-34a in the context of PCa and especially PCSCs. We provided an updated overview on the mechanisms of miR-34a regulation followed by discussing its tumor suppressive functions in PCa. Finally, based on current advances in miR-34a preclinical studies in PCa, we offered potential delivery strategies for miR-34a-based therapeutics for treating advanced PCa.
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Liu Z, Wan P, Yang M, Han F, Wang T, Wang Y, Li Y. Cell membrane camouflaged cerium oxide nanocubes for targeting enhanced tumor-selective therapy. J Mater Chem B 2021; 9:9524-9532. [PMID: 34757365 DOI: 10.1039/d1tb01685g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Anticancer therapies with profound efficacy but negligible toxicity are a fundamental pursuit that has been made humanly possible through either targeting or tumor-selective therapeutic (TST) approaches. Herein, we developed a targeting-enhanced tumor-selective cancer therapy aimed at integrating the two approaches by preparing cerium oxide (CeO2) nanocubes with glucose oxidase (GOx) modified on the cube surface and cancer cell membrane (CCM) camouflaged outside. The immune escape and homotypic binding of camouflaged CCM enable targeted delivery of the resultant CeO2-GOx@CCM nanoparticles mostly into cancer tissue, while its acidic environment (pH < 6.6) activated a cascade reaction, in which the glucose was first catalyzed by GOx into H2O2 and then by CeO2 into highly cytotoxic ˙OH killing cancer cells. In the case of off-targeting, when very few CeO2-GOx@CCM nanoparticles were accidentally delivered into normal tissue, its neutral pH environment (pH = 7.4) triggered a protective reaction, in which the H2O2 generated was catalyzed by CeO2 into non-toxic H2O and O2. Both in vitro and in vivo results demonstrated that this targeting-enhanced TST achieved the most remarkable antitumor performance with negligible toxic side effects.
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Affiliation(s)
- Zongjun Liu
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. .,Shenzhen Mindray Biomedical Electronics Co., Ltd, Shenzhen, China.,Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Peng Wan
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
| | - Mingxin Yang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
| | - Fang Han
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
| | - Tianran Wang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
| | - You Wang
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
| | - Yu Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
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Abstract
RNA-based therapeutics have shown great promise in treating a broad spectrum of diseases through various mechanisms including knockdown of pathological genes, expression of therapeutic proteins, and programmed gene editing. Due to the inherent instability and negative-charges of RNA molecules, RNA-based therapeutics can make the most use of delivery systems to overcome biological barriers and to release the RNA payload into the cytosol. Among different types of delivery systems, lipid-based RNA delivery systems, particularly lipid nanoparticles (LNPs), have been extensively studied due to their unique properties, such as simple chemical synthesis of lipid components, scalable manufacturing processes of LNPs, and wide packaging capability. LNPs represent the most widely used delivery systems for RNA-based therapeutics, as evidenced by the clinical approvals of three LNP-RNA formulations, patisiran, BNT162b2, and mRNA-1273. This review covers recent advances of lipids, lipid derivatives, and lipid-derived macromolecules used in RNA delivery over the past several decades. We focus mainly on their chemical structures, synthetic routes, characterization, formulation methods, and structure-activity relationships. We also briefly describe the current status of representative preclinical studies and clinical trials and highlight future opportunities and challenges.
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Affiliation(s)
- Yuebao Zhang
- Division of Pharmaceutics & Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Changzhen Sun
- Division of Pharmaceutics & Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Chang Wang
- Division of Pharmaceutics & Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Katarina E Jankovic
- Division of Pharmaceutics & Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Yizhou Dong
- Division of Pharmaceutics & Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
- Department of Biomedical Engineering, The Center for Clinical and Translational Science, The Comprehensive Cancer Center, Dorothy M. Davis Heart & Lung Research Institute, Department of Radiation Oncology, The Ohio State University, Columbus, Ohio 43210, United States
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11
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Abdelaal AM, Kasinski AL. Ligand-mediated delivery of RNAi-based therapeutics for the treatment of oncological diseases. NAR Cancer 2021; 3:zcab030. [PMID: 34316717 PMCID: PMC8291076 DOI: 10.1093/narcan/zcab030] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 06/21/2021] [Accepted: 06/28/2021] [Indexed: 12/19/2022] Open
Abstract
RNA interference (RNAi)-based therapeutics (miRNAs, siRNAs) have great potential for treating various human diseases through their ability to downregulate proteins associated with disease progression. However, the development of RNAi-based therapeutics is limited by lack of safe and specific delivery strategies. A great effort has been made to overcome some of these challenges resulting in development of N-acetylgalactosamine (GalNAc) ligands that are being used for delivery of siRNAs for the treatment of diseases that affect the liver. The successes achieved using GalNAc-siRNAs have paved the way for developing RNAi-based delivery strategies that can target extrahepatic diseases including cancer. This includes targeting survival signals directly in the cancer cells and indirectly through targeting cancer-associated immunosuppressive cells. To achieve targeting specificity, RNAi molecules are being directly conjugated to a targeting ligand or being packaged into a delivery vehicle engineered to overexpress a targeting ligand on its surface. In both cases, the ligand binds to a cell surface receptor that is highly upregulated by the target cells, while not expressed, or expressed at low levels on normal cells. In this review, we summarize the most recent RNAi delivery strategies, including extracellular vesicles, that use a ligand-mediated approach for targeting various oncological diseases.
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Affiliation(s)
- Ahmed M Abdelaal
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47906, USA
| | - Andrea L Kasinski
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47906, USA
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12
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Rana A, Bhatnagar S. Advancements in folate receptor targeting for anti-cancer therapy: A small molecule-drug conjugate approach. Bioorg Chem 2021; 112:104946. [PMID: 33989916 DOI: 10.1016/j.bioorg.2021.104946] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 02/17/2021] [Accepted: 04/22/2021] [Indexed: 10/21/2022]
Abstract
Targeted delivery combined with controlled release of drugs has a crucial role in future of personalized medicine. The majority of cancer drugs are intended to interfere with one or more cellular events. Anticancer agents can also be toxic to healthy cells, as healthy cells may also need to proliferate and avoid apoptosis. The focus of this review covers the principles, advantages, drawbacks and summarize criteria that must be met for design of small molecule-drug conjugates (SMDCs) to achieve the desired therapeutic potency with minimal toxicity. SMDCs are composed of a targeting ligand, a releasable bridge, a spacer, and a therapeutic payload. We summarize the criteria for the effective design that influences the selection of tumor specific receptor and optimum elements in the design of SMDCs. We also discuss the criteria for selecting the optimal therapeutic drug payload, spacer and linker. The linker chemistries and cleavage strategies are also discussed. Finally, we review the folate receptor targeting SMDCs that are in preclinical development and in clinical trials.
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Affiliation(s)
- Abhilash Rana
- Amity Institute of Biotechnology, Amity University, Sector125, Noida, Uttar Pradesh, India.
| | - Seema Bhatnagar
- Amity Institute of Biotechnology, Amity University, Sector125, Noida, Uttar Pradesh, India.
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13
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Wang Q, Fan X, Jing N, Zhao H, Yu L, Tang X. Photoregulation of Gene Expression with Ligand-Modified Caged siRNAs through Host/Guest Interaction. Chembiochem 2021; 22:1901-1907. [PMID: 33432703 DOI: 10.1002/cbic.202000763] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/22/2020] [Indexed: 02/05/2023]
Abstract
Small interfering RNA (siRNA) can effectively silence target genes through Argonate 2 (Ago2)-induced RNA interference (RNAi). It is very important to control siRNA activity in both spatial and temporal modes. Among different masking strategies, photocaging can be used to regulate gene expression through light irradiation with spatiotemporal and dose-dependent resolution. Many different caging strategies and caging groups have been reported for light-activated siRNA gene silencing. Herein, we describe a novel caging strategy that increases the blocking effect of RISC complex formation/process through host/guest (including ligand/receptor) interactions, thereby enhancing the inhibition of caged siRNA activity until light activation. This strategy can be used as a general approach to design caged siRNAs for the photomodulation of gene silencing of exogenous and endogenous genes.
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Affiliation(s)
- Qian Wang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, No. 38 Xueyuan Road, Beijing, P. R. China
| | - Xinli Fan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, No. 38 Xueyuan Road, Beijing, P. R. China
| | - Nannan Jing
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, No. 38 Xueyuan Road, Beijing, P. R. China
| | - Han Zhao
- National Center for Occupational Safety and Health, NHC, No. 27 Shilong Road, Beijing, P. R. China
| | - Lijia Yu
- National Center for Occupational Safety and Health, NHC, No. 27 Shilong Road, Beijing, P. R. China
| | - Xinjing Tang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, No. 38 Xueyuan Road, Beijing, P. R. China
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14
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Gangopadhyay S, Nikam RR, Gore KR. Folate Receptor-Mediated siRNA Delivery: Recent Developments and Future Directions for RNAi Therapeutics. Nucleic Acid Ther 2021; 31:245-270. [PMID: 33595381 DOI: 10.1089/nat.2020.0882] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
RNA interference (RNAi), a gene regulatory process mediated by small interfering RNAs (siRNAs), has made remarkable progress as a potential therapeutic agent against various diseases. However, RNAi is associated with fundamental challenges such as poor systemic delivery and susceptibility to the nucleases. Targeting ligand-bound delivery vehicles has improved the accumulation of drug at the target site, which has resulted in high transfection efficiency and enhanced gene silencing. Recently, folate receptor (FR)-mediated targeted delivery of siRNAs has garnered attention due to their enhanced cellular uptake and high transfection efficiency toward tumor cells. Folic acid (FA), due to its small size, low immunogenicity, high in vivo stability, and high binding affinity toward FRs, has attracted much attention for targeted siRNA delivery. FRs are overexpressed in a large number of tumors, including ovarian, breast, kidney, and lung cancer cells. In this review, we discuss recent advances in FA-mediated siRNA delivery to treat cancers and inflammatory diseases. This review summarizes various FA-conjugated nanoparticle systems reported so far in the literature, including liposome, silica, metal, graphene, dendrimers, chitosan, organic copolymers, and RNA nanoparticles. This review will help in the design and development of potential delivery vehicles for siRNA drug targeting to tumor cells using an FR-mediated approach.
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Affiliation(s)
- Sumit Gangopadhyay
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Rahul R Nikam
- Department of Chemistry, University of Mumbai, Mumbai, India
| | - Kiran R Gore
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
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15
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Salim L, Desaulniers JP. To Conjugate or to Package? A Look at Targeted siRNA Delivery Through Folate Receptors. Nucleic Acid Ther 2020; 31:21-38. [PMID: 33121373 DOI: 10.1089/nat.2020.0893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
RNA interference (RNAi) applications have evolved from experimental tools to study gene function to the development of a novel class of gene-silencing therapeutics. Despite decades of research, it was not until August 2018 that the US FDA approved the first-ever RNAi drug, marking a new era for RNAi therapeutics. Although there are many limitations associated with the inherent structure of RNA, delivery to target cells and tissues remains the most challenging. RNAs are unable to diffuse across cellular membranes due to their large size and polyanionic backbone and, therefore, require a delivery vector. RNAi molecules can be conjugated to a targeting ligand or packaged into a delivery vehicle. Alnylam has used both strategies in their FDA-approved formulations to achieve efficient delivery to the liver. To harness the full potential of RNAi therapeutics, however, we must be able to target additional cells and tissues. One promising target is the folate receptor α, which is overexpressed in a variety of tumors despite having limited expression and distribution in normal tissues. Folate can be conjugated directly to the RNAi molecule or used to functionalize delivery vehicles. In this review, we compare both delivery strategies and discuss the current state of research in the area of folate-mediated delivery of RNAi molecules.
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Affiliation(s)
- Lidya Salim
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, Canada
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16
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Xia X, Pollock N, Zhou J, Rossi J. Tissue-Specific Delivery of Oligonucleotides. Methods Mol Biol 2020; 2036:17-50. [PMID: 31410789 DOI: 10.1007/978-1-4939-9670-4_2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
From the initial discovery of short-interfering RNA (siRNA) and antisense oligonucleotides for specific gene knockdown at the posttranscriptional level to the current CRISPR-Cas9 system offering gene editing at the genomic level, oligonucleotides, in addition to their biological functions in storing and conveying genetic information, provide the most prominent solutions to targeted gene therapies. Nonetheless, looking into the future of curing cancer and acute diseases, researchers are only cautiously optimistic as the cellular delivery of these polyanionic biomacromolecules is still the biggest hurdle for their therapeutic realization. To overcome the delivery obstacle, oligonucleotides have been encapsulated within or conjugated with delivery vehicles for enhanced membrane penetration, improved payload, and tissue-specific delivery. Such delivery systems include but not limited to virus-based vehicles, gold-nanoparticle vehicles, formulated liposomes, and synthetic polymers. In this chapter, delivery challenges imposed by biological barriers are briefly discussed; followed by recent advances in tissue-specific oligonucleotide delivery utilizing both viral and nonviral delivery vectors, discussing their advantages, and how judicious design and formulation could improve and expand their potential as delivery vehicles.
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Affiliation(s)
- Xin Xia
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Nicolette Pollock
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Jiehua Zhou
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - John Rossi
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA, USA.
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17
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Rudra A, Li J, Shakur R, Bhagchandani S, Langer R. Trends in Therapeutic Conjugates: Bench to Clinic. Bioconjug Chem 2020; 31:462-473. [PMID: 31990184 DOI: 10.1021/acs.bioconjchem.9b00828] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In recent years, therapeutic conjugates have attracted considerable attention as a new class of drug due to their unique pharmacological properties, especially from the pharmaceutical community. Their molecular structure tunability, improved targeting specificity, and therapeutic efficacy have been demonstrated in a wide range of research and clinical applications. In this topical review, we summarize selected recent advances in bioconjugation strategies for the development of therapeutic conjugates, their emerging application in clinical settings, as well as perspectives on the direction of future research.
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Affiliation(s)
- Arnab Rudra
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, Massachusetts 02115, United States.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Junwei Li
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Rameen Shakur
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Sachin Bhagchandani
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Robert Langer
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, 300 Longwood Avenue, Boston, Massachusetts 02115, United States.,Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Harvard and MIT Division of Health Science and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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18
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Chernikov IV, Karelina UA, Meschaninova MI, Ven’yaminova AG, Zenkova MA, Vlassov VV, Chernolovskaya EL. Investigation of the Internalization of Fluorescently Labeled Lipophilic siRNA into Cultured Tumor Cells. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1068162019060128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Salim L, Islam G, Desaulniers JP. Targeted delivery and enhanced gene-silencing activity of centrally modified folic acid-siRNA conjugates. Nucleic Acids Res 2020; 48:75-85. [PMID: 31777918 PMCID: PMC6943128 DOI: 10.1093/nar/gkz1115] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/28/2019] [Accepted: 11/11/2019] [Indexed: 12/20/2022] Open
Abstract
One of the major hurdles in RNAi research has been the development of safe and effective delivery systems for siRNAs. Although various chemical modifications have been proposed to improve their pharmacokinetic behaviour, their delivery to target cells and tissues presents many challenges. In this work, we implemented a receptor-targeting strategy to selectively deliver siRNAs to cancer cells using folic acid as a ligand. Folic acid is capable of binding to cell-surface folate receptors with high affinity. These receptors have become important molecular targets for cancer research as they are overexpressed in numerous cancers despite being expressed at low levels in normal tissues. Employing a post-column copper-catalyzed alkyne-azide cycloaddition (CuAAC), we report the synthesis of siRNAs bearing folic acid modifications at different positions within the sense strand. In the absence of a transfection carrier, these siRNAs were selectively taken up by cancer cells expressing folate receptors. We show that centrally modified folic acid-siRNAs display enhanced gene-silencing activity against an exogenous gene target (∼80% knockdown after 0.75 μM treatment) and low cytotoxicity. In addition, these siRNAs achieved potent dose-dependent knockdown of endogenous Bcl-2, an important anti-apoptotic gene.
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Affiliation(s)
- Lidya Salim
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, Ontario L1G 0C5, Canada
| | - Golam Islam
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, Ontario L1G 0C5, Canada
| | - Jean-Paul Desaulniers
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, Ontario L1G 0C5, Canada
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20
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Ghiasikhou S, Cazzamalli S, Scheuermann J, Neri D, Zenobi R. Automated and enhanced extraction of a small molecule-drug conjugate using an enzyme-inhibitor interaction based SPME tool followed by direct analysis by ESI-MS. Anal Bioanal Chem 2019; 411:7387-7398. [DOI: 10.1007/s00216-019-02165-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 08/20/2019] [Accepted: 09/23/2019] [Indexed: 12/11/2022]
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21
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Shamsi M, Mohammadi A, Manshadi MK, Sanati-Nezhad A. Mathematical and computational modeling of nano-engineered drug delivery systems. J Control Release 2019; 307:150-165. [DOI: 10.1016/j.jconrel.2019.06.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 06/10/2019] [Accepted: 06/12/2019] [Indexed: 12/20/2022]
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22
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Current Aspects of siRNA Bioconjugate for In Vitro and In Vivo Delivery. Molecules 2019; 24:molecules24122211. [PMID: 31200490 PMCID: PMC6631009 DOI: 10.3390/molecules24122211] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 06/03/2019] [Accepted: 06/08/2019] [Indexed: 02/07/2023] Open
Abstract
Studies on siRNA delivery have seen intense growth in the past decades since siRNA has emerged as a new class of gene therapeutics for the treatment of various diseases. siRNA bioconjugate, as one of the major delivery strategies, offers the potential to enhance and broaden pharmacological properties of siRNA, while minimizing the heterogeneity and stability-correlated toxicology. This review summarizes the recent developments of siRNA bioconjugate, including the conjugation with antibody, peptide, aptamer, small chemical, lipidoid, cell-penetrating peptide polymer, and nanoparticle. These siRNA bioconjugate, either administrated alone or formulated with other agents, could significantly improve pharmacokinetic behavior, enhance the biological half-life, and increase the targetability while maintaining sufficient gene silencing activity, with a concomitant improvement of the therapeutic outcomes and diminishment of adverse effects. This review emphasizes the delivery application of these siRNA bioconjugates, especially the conjugation strategy that control the integrity, stability and release of siRNA bioconjugates. The limitations conferred by these conjugation strategies have also been covered.
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23
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Chernikov IV, Vlassov VV, Chernolovskaya EL. Current Development of siRNA Bioconjugates: From Research to the Clinic. Front Pharmacol 2019; 10:444. [PMID: 31105570 PMCID: PMC6498891 DOI: 10.3389/fphar.2019.00444] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/08/2019] [Indexed: 12/12/2022] Open
Abstract
Small interfering RNAs (siRNAs) acting via RNA interference mechanisms are able to recognize a homologous mRNA sequence in the cell and induce its degradation. The main problems in the development of siRNA-based drugs for therapeutic use are the low efficiency of siRNA delivery to target cells and the degradation of siRNAs by nucleases in biological fluids. Various approaches have been proposed to solve the problem of siRNA delivery in vivo (e.g., viruses, cationic lipids, polymers, nanoparticles), but all have limitations for therapeutic use. One of the most promising approaches to solve the problem of siRNA delivery to target cells is bioconjugation; i.e., the covalent connection of siRNAs with biogenic molecules (lipophilic molecules, antibodies, aptamers, ligands, peptides, or polymers). Bioconjugates are "ideal nanoparticles" since they do not need a positive charge to form complexes, are less toxic, and are less effectively recognized by components of the immune system because of their small size. This review is focused on strategies and principles for constructing siRNA bioconjugates for in vivo use.
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Affiliation(s)
- Ivan V Chernikov
- Laboratory of Nucleic Acids Biochemistry, Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Valentin V Vlassov
- Laboratory of Nucleic Acids Biochemistry, Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Elena L Chernolovskaya
- Laboratory of Nucleic Acids Biochemistry, Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
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24
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Yu L, Liang D, Chen C, Tang X. Caged siRNAs with Single cRGD Modification for Photoregulation of Exogenous and Endogenous Gene Expression in Cells and Mice. Biomacromolecules 2018; 19:2526-2534. [DOI: 10.1021/acs.biomac.8b00159] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Lijia Yu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine, Peking University, No. 38, Xueyuan Rd, Beijing 100191, China
| | - Duanwei Liang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine, Peking University, No. 38, Xueyuan Rd, Beijing 100191, China
| | - Changmai Chen
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine, Peking University, No. 38, Xueyuan Rd, Beijing 100191, China
| | - Xinjing Tang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine, Peking University, No. 38, Xueyuan Rd, Beijing 100191, China
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25
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Orellana EA, Tenneti S, Rangasamy L, Lyle LT, Low PS, Kasinski AL. FolamiRs: Ligand-targeted, vehicle-free delivery of microRNAs for the treatment of cancer. Sci Transl Med 2018; 9:9/401/eaam9327. [PMID: 28768807 DOI: 10.1126/scitranslmed.aam9327] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 06/16/2017] [Indexed: 12/20/2022]
Abstract
MicroRNAs are small RNAs that negatively regulate gene expression posttranscriptionally. Because changes in microRNA expression can promote or maintain disease states, microRNA-based therapeutics are being evaluated extensively. Unfortunately, the therapeutic potential of microRNA replacement is limited by deficient delivery vehicles. In this work, microRNAs are delivered in the absence of a protective vehicle. The method relies on direct attachment of microRNAs to folate (FolamiR), which mediates delivery of the conjugated microRNA into cells that overexpress the folate receptor. We show that the tumor-suppressive FolamiR, FolamiR-34a, is quickly taken up both by triple-negative breast cancer cells in vitro and in vivo and by tumors in an autochthonous model of lung cancer and slows their progression. This method delivers microRNAs directly to tumors in vivo without the use of toxic vehicles, representing an advance in the development of nontoxic, cancer-targeted therapeutics.
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Affiliation(s)
- Esteban A Orellana
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.,PULSe Graduate Program, Purdue University, West Lafayette, IN 47907, USA
| | - Srinivasarao Tenneti
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.,Department of Chemistry and Biochemistry, Ohio State University, Columbus, OH 43202, USA
| | | | - L Tiffany Lyle
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN 47907, USA
| | - Philip S Low
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.,Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA
| | - Andrea L Kasinski
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA. .,Purdue Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA
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26
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Yu L, Jing N, Yang Z, Zhang L, Tang X. Caged siRNAs with single folic acid modification of antisense RNA for photomodulation of exogenous and endogenous gene expression in cells. Org Biomol Chem 2018; 16:7029-7035. [DOI: 10.1039/c8ob01952e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Photoregulating gene expression using folic acid modified caged siRNA through complex formation of folic acid/folate receptor.
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Affiliation(s)
- Lijia Yu
- National Center of Occupational Safety and Health
- State Administration of Work Safety
- Beijing 102308
- China
- State key Laboratory of Natural and Biomimetic Drugs
| | - Nannan Jing
- State key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine
- Peking University
- Beijing 100191
- China
| | - Zhenjun Yang
- State key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine
- Peking University
- Beijing 100191
- China
| | - Lihe Zhang
- State key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine
- Peking University
- Beijing 100191
- China
| | - Xinjing Tang
- State key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences and Center for Noncoding RNA Medicine
- Peking University
- Beijing 100191
- China
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27
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PSMA-targeted polyinosine/polycytosine vector induces prostate tumor regression and invokes an antitumor immune response in mice. Proc Natl Acad Sci U S A 2017; 114:13655-13660. [PMID: 29229829 DOI: 10.1073/pnas.1714587115] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
There is an urgent need for an effective treatment for metastatic prostate cancer (PC). Prostate tumors invariably overexpress prostate surface membrane antigen (PSMA). We designed a nonviral vector, PEI-PEG-DUPA (PPD), comprising polyethylenimine-polyethyleneglycol (PEI-PEG) tethered to the PSMA ligand, 2-[3-(1, 3-dicarboxy propyl)ureido] pentanedioic acid (DUPA), to treat PC. The purpose of PEI is to bind polyinosinic/polycytosinic acid (polyIC) and allow endosomal release, while DUPA targets PC cells. PolyIC activates multiple pathways that lead to tumor cell death and to the activation of bystander effects that harness the immune system against the tumor, attacking nontargeted neighboring tumor cells and reducing the probability of acquired resistance and disease recurrence. Targeting polyIC directly to tumor cells avoids the toxicity associated with systemic delivery. PPD selectively delivered polyIC into PSMA-overexpressing PC cells, inducing apoptosis, cytokine secretion, and the recruitment of human peripheral blood mononuclear cells (PBMCs). PSMA-overexpressing tumors in nonobese diabetic/severe combined immunodeficiency (NOD/SCID) mice with partially reconstituted immune systems were significantly shrunken following PPD/polyIC treatment, in all cases. Half of the tumors showed complete regression. PPD/polyIC invokes antitumor immunity, but unlike many immunotherapies does not need to be personalized for each patient. The potent antitumor effects of PPD/polyIC should spur its development for clinical use.
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28
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Chernikov IV, Gladkikh DV, Meschaninova MI, Ven'yaminova AG, Zenkova MA, Vlassov VV, Chernolovskaya EL. Cholesterol-Containing Nuclease-Resistant siRNA Accumulates in Tumors in a Carrier-free Mode and Silences MDR1 Gene. MOLECULAR THERAPY-NUCLEIC ACIDS 2017; 6:209-220. [PMID: 28325287 PMCID: PMC5363506 DOI: 10.1016/j.omtn.2016.12.011] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/23/2016] [Accepted: 12/23/2016] [Indexed: 12/26/2022]
Abstract
Chemical modifications are an effective way to improve the therapeutic properties of small interfering RNAs (siRNAs), making them more resistant to degradation in serum and ensuring their delivery to target cells and tissues. Here, we studied the carrier-free biodistribution and biological activity of a nuclease-resistant anti-MDR1 cholesterol-siRNA conjugate in healthy and tumor-bearing severe combined immune deficiency (SCID) mice. The attachment of cholesterol to siRNA provided its efficient accumulation in the liver and in tumors, and reduced its retention in the kidneys after intravenous and intraperitoneal injection. The major part of cholesterol-siRNA after intramuscular and subcutaneous injections remained in the injection place. Confocal microscopy data demonstrated that cholesterol-siRNA spread deep in the tissue and was present in the cytoplasm of almost all the liver and tumor cells. The reduction of P-glycoprotein level in human KB-8-5 xenograft overexpressing the MDR1 gene by 60% was observed at days 5–6 after injection. Then, its initial level recovered by the eighth day. The data showed that, regardless of the mode of administration (intravenous, intraperitoneal, or peritumoral), cholesterol-siMDR efficiently reduced the P-glycoprotein level in tumors. The designed anti-MDR1 conjugate has potential as an adjuvant therapeutic for the reversal of multiple drug resistance of cancer cells.
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Affiliation(s)
- Ivan V Chernikov
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Daniil V Gladkikh
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Mariya I Meschaninova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Alya G Ven'yaminova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Marina A Zenkova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Valentin V Vlassov
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
| | - Elena L Chernolovskaya
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia.
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29
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Lavorgna G, Vago R, Sarmini M, Montorsi F, Salonia A, Bellone M. Long non-coding RNAs as novel therapeutic targets in cancer. Pharmacol Res 2016; 110:131-138. [DOI: 10.1016/j.phrs.2016.05.018] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 05/17/2016] [Accepted: 05/17/2016] [Indexed: 02/07/2023]
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30
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Jivrajani M, Nivsarkar M. Ligand-targeted bacterial minicells: Futuristic nano-sized drug delivery system for the efficient and cost effective delivery of shRNA to cancer cells. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 12:2485-2498. [PMID: 27378204 DOI: 10.1016/j.nano.2016.06.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 05/13/2016] [Accepted: 06/14/2016] [Indexed: 10/21/2022]
Abstract
In this study, shRNA against VEGFA was packaged in bacterial minicells and surface of minicells was modified with folic acid. Analysis of cellular internalization revealed that folic acid conjugated minicells internalized through receptor mediated endocytosis in folate and PSMA receptor positive KB and LNCaP cells, respectively. In contrast, A549 (folate receptor negative) cells showed minute internalization. In vitro delivery of FAminicellsVEGFA significantly reduced the expression of VEGFA mRNA in KB and LNCaP cells whereas expression of VEGFA remained unaltered in A549 cells. FAminicellsVEGFA significantly reduced tumor volume in mice bearing KB and LNCaP xenograft. On contrary, gradual increase in the tumor volume was recorded in A549 xenograft. FAminicellsVEGFA significantly silenced the VEGFA mRNA in KB and LNCaP xenograft. Expression of VEGFA remained same in FAminicellsVEGFA delivered A549 xenograft. In vivo biodistribution study showed that majority of FAminicellsVEGFA were localized in the tumor followed by intravenous administration.
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Affiliation(s)
- Mehul Jivrajani
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Sarkhej-Gandhinagar Highway, Thaltej, Ahmedabad, Gujarat, India; Faculty of Science, NIRMA University, Sarkhej-Gandhinagar Highway, Gota, Ahmedabad, Gujarat, India.
| | - Manish Nivsarkar
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Sarkhej-Gandhinagar Highway, Thaltej, Ahmedabad, Gujarat, India.
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Müller K, Kessel E, Klein PM, Höhn M, Wagner E. Post-PEGylation of siRNA Lipo-oligoamino Amide Polyplexes Using Tetra-glutamylated Folic Acid as Ligand for Receptor-Targeted Delivery. Mol Pharm 2016; 13:2332-45. [DOI: 10.1021/acs.molpharmaceut.6b00102] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Katharina Müller
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Eva Kessel
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Munich, Germany
- Nanosystems Initiative Munich, Schellingstrasse 4, D-80799 Munich, Germany
| | - Philipp M. Klein
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Miriam Höhn
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Ernst Wagner
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Munich, Germany
- Nanosystems Initiative Munich, Schellingstrasse 4, D-80799 Munich, Germany
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Conjugates of small targeting molecules to non-viral vectors for the mediation of siRNA. Acta Biomater 2016; 36:21-41. [PMID: 27045350 DOI: 10.1016/j.actbio.2016.03.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 03/29/2016] [Accepted: 03/31/2016] [Indexed: 01/08/2023]
Abstract
UNLABELLED To use siRNA (small interfering RNA) for gene therapy, a gene delivery system is often necessary to overcome several challenging requirements including rapid excretion, low stability in blood serum, non-specific accumulation in tissues, poor cellular uptake and inefficient intracellular release. Active and/or passive targeting should help the delivery system to reach the desired tissue or cell, to be internalized, and to deliver siRNA to the cytoplasm so that siRNA can inhibit protein synthesis. This review covers conjugates of small targeting molecules and non-viral delivery systems for the mediation of siRNA, with a focus on their transfection properties in order to help the development of new and efficient siRNA delivery systems, as the therapeutic solutions of tomorrow. STATEMENT OF SIGNIFICANCE The delivery of siRNA into cells or tissues remains to be a challenge for its applications, an alternative strategy for siRNA delivery systems is direct conjugation of non-viral vectors with targeting moieties for cellular delivery. In comparison to macromolecules, small targeting molecules have attracted great attention due to their many potential advantages including significant simplicity and ease of production, good repeatability and biodegradability. This review will focus on the most recent advances in the delivery of siRNA using conjugates of small targeting molecules and non-viral delivery systems. Based the editor's suggestions, we hope the revised manuscript could provide more profound understanding to the conjugates of targeting molecules to vectors for mediation of siRNA.
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Lee JB, Zhang K, Tam YYC, Quick J, Tam YK, Lin PJ, Chen S, Liu Y, Nair JK, Zlatev I, Rajeev KG, Manoharan M, Rennie PS, Cullis PR. A Glu-urea-Lys Ligand-conjugated Lipid Nanoparticle/siRNA System Inhibits Androgen Receptor Expression In Vivo. MOLECULAR THERAPY. NUCLEIC ACIDS 2016; 5:e348. [PMID: 28131285 PMCID: PMC5024509 DOI: 10.1038/mtna.2016.43] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 05/11/2016] [Indexed: 12/20/2022]
Abstract
The androgen receptor plays a critical role in the progression of prostate
cancer. Here, we describe targeting the prostate-specific membrane antigen using
a lipid nanoparticle formulation containing small interfering RNA designed to
silence expression of the messenger RNA encoding the androgen receptor.
Specifically, a Glu-urea-Lys PSMA-targeting ligand was incorporated into the
lipid nanoparticle system formulated with a long alkyl chain polyethylene
glycol-lipid to enhance accumulation at tumor sites and facilitate intracellular
uptake into tumor cells following systemic administration. Through these
features, and by using a structurally refined cationic lipid and an optimized
small interfering RNA payload, a lipid nanoparticle system with improved potency
and significant therapeutic potential against prostate cancer and potentially
other solid tumors was developed. Decreases in serum prostate-specific antigen,
tumor cellular proliferation, and androgen receptor levels were observed in a
mouse xenograft model following intravenous injection. These results support the
potential clinical utility of a prostate-specific membrane
antigen–targeted lipid nanoparticle system to silence the androgen
receptor in advanced prostate cancer.
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Affiliation(s)
- Justin B Lee
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Kaixin Zhang
- Vancouver Prostate Centre, Vancouver, British Columbia, Canada
| | - Yuen Yi C Tam
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Joslyn Quick
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Ying K Tam
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Paulo Jc Lin
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Sam Chen
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Yan Liu
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada
| | - Jayaprakash K Nair
- Department of Drug Discovery, Alnylam Pharmaceuticals, Cambridge, Massachusetts, USA
| | - Ivan Zlatev
- Department of Drug Discovery, Alnylam Pharmaceuticals, Cambridge, Massachusetts, USA
| | | | - Muthiah Manoharan
- Department of Drug Discovery, Alnylam Pharmaceuticals, Cambridge, Massachusetts, USA
| | - Paul S Rennie
- Vancouver Prostate Centre, Vancouver, British Columbia, Canada
| | - Pieter R Cullis
- Department of Biochemistry and Molecular Biology at the University of British Columbia, Vancouver, British Columbia, Canada.
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Liu L, Zheng M, Librizzi D, Renette T, Merkel OM, Kissel T. Efficient and Tumor Targeted siRNA Delivery by Polyethylenimine-graft-polycaprolactone-block-poly(ethylene glycol)-folate (PEI-PCL-PEG-Fol). Mol Pharm 2015; 13:134-43. [PMID: 26641134 DOI: 10.1021/acs.molpharmaceut.5b00575] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Efficient delivery of functional nucleic acids into specific cells or tissues is still a challenge for gene therapy and largely depends on targeted delivery strategies. The folate receptor (FR) is known to be overexpressed extracellularly on a variety of human cancers and is therefore an outstanding gate for tumor-targeted Trojan horse-like delivery of therapeutics. In this study, an amphiphilic and biodegradable ternary copolymer conjugated with folate as ligand, polyethylenimine-graft-polycaprolactone-block-poly(ethylene glycol)-folate (PEI-PCL-PEG-Fol) was synthesized and evaluated for targeted siRNA delivery via folate-FR recognition. The amphiphilic character of similar polymers was shown previously to support endosomal release of endocytosed nanocarriers and to promote formation of long circulating micelles. The obtained PEI-PCL-PEG-Fol exhibited less cytotoxicity in comparison with the corresponding ternary copolymer without folate (PEI-PCL-PEG) and with unmodified PEI25kDa. Stable micelle-like polyplexes with hydrodynamic diameters about 100 nm were found to have a zeta potential of +8.6 mV, which was lower than that of micelleplexes without folate-conjugation (+13-16 mV). Nonetheless, increased cellular uptake and in vitro gene knockdown of PEI-PCL-PEG-Fol/siRNA micelleplexes were observed in SKOV-3 cells, an FR overexpressing cell line, in comparison with the nonfolate-conjugated ones. Moreover, PEI-PCL-PEG-Fol/siRNA micelleplexes exhibited excellent stability in vivo during the analysis of 120 min and a longer circulation half life than hyPEI25kDa/siRNA polyplexes. Most interestingly, the targeted delivery system yielded 17% deposition of the i.v. injected siRNA per gram in the tumor after 24 h due to the effective folate targeting and the prolonged circulation.
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Affiliation(s)
- Li Liu
- Department of Pharmaceutics and Biopharmacy, Philipps-University Marburg , Ketzerbach 63, 35032 Marburg, Germany.,School of Pharmacy, Shanghai Jiao Tong University , 200240 Shanghai, China
| | - Mengyao Zheng
- Department of Pharmaceutics and Biopharmacy, Philipps-University Marburg , Ketzerbach 63, 35032 Marburg, Germany
| | - Damiano Librizzi
- Department of Nuclear Medicine, University of Hospital Giessen and Marburg GmbH , Baldingerstrasse, 35043 Marburg, Germany
| | - Thomas Renette
- Department of Pharmaceutics and Biopharmacy, Philipps-University Marburg , Ketzerbach 63, 35032 Marburg, Germany
| | - Olivia M Merkel
- Department of Pharmaceutics and Biopharmacy, Philipps-University Marburg , Ketzerbach 63, 35032 Marburg, Germany.,Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University , 259 Mack Avenue, Detroit, Michigan 48201, United States
| | - Thomas Kissel
- Department of Pharmaceutics and Biopharmacy, Philipps-University Marburg , Ketzerbach 63, 35032 Marburg, Germany
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Srinivasarao M, Galliford CV, Low PS. Principles in the design of ligand-targeted cancer therapeutics and imaging agents. Nat Rev Drug Discov 2015; 14:203-19. [DOI: 10.1038/nrd4519] [Citation(s) in RCA: 476] [Impact Index Per Article: 52.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Yousefpour P, Chilkoti A. Co-opting biology to deliver drugs. Biotechnol Bioeng 2014; 111:1699-716. [PMID: 24916780 PMCID: PMC4251460 DOI: 10.1002/bit.25307] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/30/2014] [Accepted: 06/05/2014] [Indexed: 01/17/2023]
Abstract
The goal of drug delivery is to improve the safety and therapeutic efficacy of drugs. This review focuses on delivery platforms that are either derived from endogenous pathways, long-circulating biomolecules and cells or that piggyback onto long-circulating biomolecules and cells. The first class of such platforms is protein-based delivery systems--albumin, transferrin, and fusion to the Fc domain of antibodies--that have a long-circulation half-life and are designed to transport different molecules. The second class is lipid-based delivery systems-lipoproteins and exosomes-that are naturally occurring circulating lipid particles. The third class is cell-based delivery systems--erythrocytes, macrophages, and platelets--that have evolved, for reasons central to their function, to exhibit a long life-time in the body. The last class is small molecule-based delivery systems that include folic acid. This article reviews the biology of these systems, their application in drug delivery, and the promises and limitations of these endogenous systems for drug delivery.
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Affiliation(s)
- Parisa Yousefpour
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, 27708
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Wang B, Galliford CV, Low PS. Guiding principles in the design of ligand-targeted nanomedicines. Nanomedicine (Lond) 2014; 9:313-30. [PMID: 24552563 DOI: 10.2217/nnm.13.175] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Medicines for the treatment of most human pathologies are encumbered by unwanted side effects that arise from the deposition of an effective drug into the wrong tissues. The logical remedy for these undesirable properties involves selective targeting of the therapeutic agent to pathologic cells, thereby avoiding collateral toxicity to healthy cells. Since significant advantages can also accrue by incorporating a therapeutic or imaging agent into a nanoparticle, many laboratories are now combining both benefits into a single formulation. This review will focus on the major guiding principles in the design of ligand-targeted nanoparticles, including optimization of their chemical and physical properties, selection of the ideal targeting ligand, engineering of the appropriate surface passivation and linker strategies to achieve selective delivery of the entrapped cargo to the desired diseased cell.
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Affiliation(s)
- Bingbing Wang
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Chris V Galliford
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Philip S Low
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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Kanasty R, Dorkin JR, Vegas A, Anderson D. Delivery materials for siRNA therapeutics. NATURE MATERIALS 2013; 12:967-77. [PMID: 24150415 DOI: 10.1038/nmat3765] [Citation(s) in RCA: 1321] [Impact Index Per Article: 120.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 08/27/2013] [Indexed: 04/14/2023]
Abstract
RNA interference (RNAi) has broad potential as a therapeutic to reversibly silence any gene. To achieve the clinical potential of RNAi, delivery materials are required to transport short interfering RNA (siRNA) to the site of action in the cells of target tissues. This Review provides an introduction to the biological challenges that siRNA delivery materials aim to overcome, as well as a discussion of the way that the most effective and clinically advanced classes of siRNA delivery systems, including lipid nanoparticles and siRNA conjugates, are designed to surmount these challenges. The systems that we discuss are diverse in their approaches to the delivery problem, and provide valuable insight to guide the design of future siRNA delivery materials.
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Affiliation(s)
- Rosemary Kanasty
- 1] Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA [2] David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA
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Abstract
Insufficient pharmacokinetic properties and poor cellular uptake are the main hurdles for successful therapeutic development of oligonucleotide agents. The covalent attachment of various ligands designed to influence the biodistribution and cellular uptake or for targeting specific tissues is an attractive possibility to advance therapeutic applications and to expand development options. In contrast to advanced formulations, which often consist of multiple reagents and are sensitive to a variety of preparation conditions, oligonucleotide conjugates are defined molecules, enabling structure-based analytics and quality control techniques. This review gives an overview of current developments of oligonucleotide conjugates for therapeutic applications. Attached ligands comprise peptides, proteins, carbohydrates, aptamers and small molecules, including cholesterol, tocopherol and folic acid. Important linkage types and conjugation methods are summarized. The distinct ligands directly influence biochemical parameters, uptake mechanisms and pharmacokinetic properties.
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40
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Lu H, Wang D, Kazane S, Javahishvili T, Tian F, Song F, Sellers A, Barnett B, Schultz PG. Site-specific antibody-polymer conjugates for siRNA delivery. J Am Chem Soc 2013; 135:13885-91. [PMID: 23924037 DOI: 10.1021/ja4059525] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We describe here the development of site-specific antibody-polymer conjugates (APCs) for the selective delivery of small interference RNAs (siRNAs) to target cells. APCs were synthesized in good yields by conjugating an aminooxy-derivatized cationic block copolymer to an anti-HER2 Fab or full-length IgG by means of genetically encoded p-acetyl phenylalanine (pAcF). The APCs all showed binding affinity comparable to that of HER2 as their native counterparts and no significant cellular cytotoxicity. Mutant S202-pAcF Fab and Q389-pAcF IgG polymer conjugates specifically delivered siRNAs to HER2(+) cells and mediated potent gene silencing at both the mRNA and protein levels. However, a mutant A121-pAcF IgG polymer conjugate, despite its high binding affinity to HER2 antigen, did not induce a significant RNA interference response in HER2(+) cells, presumably due to steric interference with antigen binding and internalization. These results highlight the importance of conjugation site on the activity of antibody-polymer-based therapeutics and suggest that such chemically defined APCs may afford a useful targeted delivery platform for siRNAs or other nucleic acid-based therapies.
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Affiliation(s)
- Hua Lu
- Department of Chemistry, The Scripps Research Institute , La Jolla, California 92037, United States
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Koenig O, Walker T, Perle N, Zech A, Neumann B, Schlensak C, Wendel HP, Nolte A. New aspects of gene-silencing for the treatment of cardiovascular diseases. Pharmaceuticals (Basel) 2013; 6:881-914. [PMID: 24276320 PMCID: PMC3816708 DOI: 10.3390/ph6070881] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 06/15/2013] [Accepted: 07/11/2013] [Indexed: 01/17/2023] Open
Abstract
Coronary heart disease (CHD), mainly caused by atherosclerosis, represents the single leading cause of death in industrialized countries. Besides the classical interventional therapies new applications for treatment of vascular wall pathologies are appearing on the horizon. RNA interference (RNAi) represents a novel therapeutic strategy due to sequence-specific gene-silencing through the use of small interfering RNA (siRNA). The modulation of gene expression by short RNAs provides a powerful tool to theoretically silence any disease-related or disease-promoting gene of interest. In this review we outline the RNAi mechanisms, the currently used delivery systems and their possible applications to the cardiovascular system. Especially, the optimization of the targeting and transfection procedures could enhance the efficiency of siRNA delivery drastically and might open the way to clinical applicability. The new findings of the last years may show the techniques to new innovative therapies and could probably play an important role in treating CHD in the future.
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Affiliation(s)
- Olivia Koenig
- Clinical Research Laboratory, Dept. of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Calwerstr. 7/1, 72076 Tuebingen, Germany.
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Valencia PM, Pridgen EM, Perea B, Gadde S, Sweeney C, Kantoff PW, Bander NH, Lippard SJ, Langer R, Karnik R, Farokhzad OC. Synergistic cytotoxicity of irinotecan and cisplatin in dual-drug targeted polymeric nanoparticles. Nanomedicine (Lond) 2012; 8:687-98. [PMID: 23075285 DOI: 10.2217/nnm.12.134] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
AIM Two unexplored aspects for irinotecan and cisplatin (I&C) combination chemotherapy are: actively targeting both drugs to a specific diseased cell type, and delivering both drugs on the same vehicle to ensure their synchronized entry into the cell at a well-defined ratio. In this work, the authors report the use of targeted polymeric nanoparticles (NPs) to coencapsulate and deliver I&C to cancer cells expressing the prostate-specific membrane antigen. MATERIALS & METHODS Targeted NPs were prepared in a single step by mixing four different precursors inside microfluidic devices. RESULTS I&C were encapsulated in 55-nm NPs and showed an eightfold increase in internalization by prostate-specific membrane antigen-expressing LNCaP cells compared with nontargeted NPs. NPs coencapsulating both drugs exhibited strong synergism in LNCaP cells with a combination index of 0.2. CONCLUSION The strategy of coencapsulating both I&C in a single NP targeted to a specific cell type could potentially be used to treat different types of cancer.
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Affiliation(s)
- Pedro M Valencia
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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43
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Wagner E. Polymers for siRNA delivery: inspired by viruses to be targeted, dynamic, and precise. Acc Chem Res 2012; 45:1005-13. [PMID: 22191535 DOI: 10.1021/ar2002232] [Citation(s) in RCA: 248] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthetic small interfering RNA (siRNA) presents an exciting novel medical opportunity. Although researchers agree that siRNA could have a great therapeutic impact, the required extracellular and intracellular delivery of these molecules into the disease-associated target cells presents the primary roadblock for the broader translation of these molecules into medicines. Thus, the design of adequate delivery technologies has utmost importance. Viruses are natural masterpieces of nucleic acid delivery and present chemists and drug delivery experts with a template for the design of artificial carriers for synthetic nucleic acids such as siRNA. They have been developed into gene vectors and have provided convincing successes in gene therapy. Optimized by biological evolution, viruses are programmed to be dynamic and bioresponsive as they enter living cells, and they carry out their functions in a precisely defined sequence. However, because they are synthesized within living cells and with naturally available nucleotides and amino acids, the chemistry of viruses is limited. With the use of diverse synthetic molecules and macromolecules, chemists can provide delivery solutions beyond the scope of the natural evolution of viruses. This Account describes the design and synthesis of "synthetic siRNA viruses." These structures contain elements that mimic the delivery functions of viral particles and surface domains that shield against undesired biological interactions and enable specific host cell receptor binding through the presentation of multiple targeting ligands. For example, cationic polymers can reversibly package one or more siRNA molecules into nanoparticle cores to protect them against a degradative bioenvironment. After internalization by receptor-mediated endocytosis into the acidifying endosomes of cells, synthetic siRNA can escape from these vesicles through the activation of membrane-disruption domains as viruses do and reach the cytoplasm, the location of RNA interference. This multistep task presents an attractive challenge for chemists. Similar to the design of prodrugs, the functional domains of these systems have to be activated in a dynamic mode, triggered by conformational changes or bond cleavages in the relevant microenvironment such as the acidic endosome or disulfide-reducing cytoplasm. These chemical analogues of viral domains are often synthetically simpler and more easily accessible molecules than viral proteins. Their precise assembly into multifunctional macromolecular and supramolecular structures is facilitated by improved analytical techniques, precise orthogonal conjugation chemistries, and sequence-defined polymer syntheses. The chemical evolution of microdomains using chemical libraries and macromolecular and supramolecular evolution could provide key strategies for optimizing siRNA carriers to selected medical indications.
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Affiliation(s)
- Ernst Wagner
- Pharmaceutical Biotechnology, Center for System-Based Drug Research, and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, D-81377 Munich, Germany
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Delivery and biodistribution of siRNA for cancer therapy: challenges and future prospects. Ther Deliv 2012; 3:245-61. [DOI: 10.4155/tde.11.155] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
RNAi-based approaches provide a promising therapeutic modality for the treatment of cancer. The inaccessibility of tumors in different cancer types necessitates the development of safe, specific and efficient systemic delivery systems to meet therapeutic need. The translation of siRNA-based cancer therapeutics to the clinic is hindered by several challenges associated with the cargo (siRNA) and the delivery system, including susceptibility to nucleases; insufficient circulation half-life due to phagocytosis by the reticuloendothelial system, transient and poor biodistribution in the tumor tissue; cellular uptake; inability to escape endosomes and release into the cytosolic compartment for an RNAi-mediated effect; microRNA-like unintended off-target effects; undesirable immune stimulation; and carrier-related toxicity. This review provides an overview of the pharmacokinetic and biodistribution challenges witnessed in the delivery of siRNA when administered systemically. It also describes the current delivery approaches using liposome-, polymer- and peptide-based delivery systems shown to elicit significant gene silencing and tumor growth regression in proof-of-concept studies. As part of future perspectives, delivery agents that showed significant efficacy in preclinical rodent models and clinical trials are also reviewed.
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45
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Dohmen C, Fröhlich T, Lächelt U, Röhl I, Vornlocher HP, Hadwiger P, Wagner E. Defined Folate-PEG-siRNA Conjugates for Receptor-specific Gene Silencing. MOLECULAR THERAPY. NUCLEIC ACIDS 2012; 1:e7. [PMID: 23344624 PMCID: PMC3381594 DOI: 10.1038/mtna.2011.10] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Gene silencing mediated by small interfering RNA (siRNA) is a novel approach in the development of new cancer therapeutics. Polycations used for nucleic acid delivery still remain heterogeneous compounds, despite continuous progress in polymer synthetic technologies. Here we report the development of a structural defined folic acid polyethylene glycol (PEG) siRNA conjugate accessible via click chemistry yielding a monodisperse ligand-PEG-siRNA conjugate. The folic acid targeting ligand was synthesized by solid phase supported peptide chemistry. The conjugate was shown to be specifically internalized into folic acid receptor expressing cells. When combined with a structurally defined polycation, again synthesized with the precision of solid phase chemistry, efficient receptor specific gene silencing is achieved.
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Affiliation(s)
- Christian Dohmen
- Pharmaceutical Biotechnology, Center of System-based Drug Research, Center for Nanoscience, Ludwig-Maximilians-University, Munich, Germany
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Scholz C, Wagner E. Therapeutic plasmid DNA versus siRNA delivery: common and different tasks for synthetic carriers. J Control Release 2011; 161:554-65. [PMID: 22123560 DOI: 10.1016/j.jconrel.2011.11.014] [Citation(s) in RCA: 235] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 11/10/2011] [Accepted: 11/13/2011] [Indexed: 01/22/2023]
Abstract
Gene therapy offers great opportunities for the treatment of severe diseases including cancer. In recent years the design of synthetic carriers for nucleic acid delivery has become a research field of increasing interest. Studies on the delivery of plasmid DNA (pDNA) have brought up a variety of gene delivery vehicles. The more recently emerged gene silencing strategy by the intracellular delivery of small interfering RNA (siRNA) takes benefit from existing expertise in pDNA transfer. Despite common properties however, delivery of siRNA also faces distinct challenges due to apparent differences in size, stability of the formed nucleic acid complexes, the location and mechanism of action. This review emphasizes the common aspects and main differences between pDNA and siRNA delivery, taking into consideration a wide spectrum of polymer-based, lipidic and peptide carriers. Challenges and opportunities which result from these differences as well as the recent progress made in the optimization of carrier design are presented.
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Affiliation(s)
- Claudia Scholz
- Pharmaceutical Biotechnology, Center for System-based Drug Research, and Center for NanoScience, Ludwig-Maximilians-Universität, Butenandtstrasse 5-13, 81377 Munich, Germany
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Petrova NS, Chernikov IV, Meschaninova MI, Dovydenko IS, Venyaminova AG, Zenkova MA, Vlassov VV, Chernolovskaya EL. Carrier-free cellular uptake and the gene-silencing activity of the lipophilic siRNAs is strongly affected by the length of the linker between siRNA and lipophilic group. Nucleic Acids Res 2011; 40:2330-44. [PMID: 22080508 PMCID: PMC3299988 DOI: 10.1093/nar/gkr1002] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The conjugation of siRNA to molecules, which can be internalized into the cell via natural transport mechanisms, can result in the enhancement of siRNA cellular uptake. Herein, the carrier-free cellular uptake of nuclease-resistant anti-MDR1 siRNA equipped with lipophilic residues (cholesterol, lithocholic acid, oleyl alcohol and litocholic acid oleylamide) attached to the 5′-end of the sense strand via oligomethylene linker of various length was investigated. A convenient combination of H-phosphonate and phosphoramidite methods was developed for the synthesis of 5′-lipophilic conjugates of siRNAs. It was found that lipophilic siRNA are able to effectively penetrate into HEK293, HepG2 and KB-8-5 cancer cells when used in a micromolar concentration range. The efficiency of the uptake is dependent upon the type of lipophilic moiety, the length of the linker between the moiety and the siRNA and cell type. Among all the conjugates tested, the cholesterol-conjugated siRNAs with linkers containing from 6 to 10 carbon atoms demonstrate the optimal uptake and gene silencing properties: the shortening of the linker reduces the efficiency of the cellular uptake of siRNA conjugates, whereas the lengthening of the linker facilitates the uptake but retards the gene silencing effect and decreases the efficiency of the silencing.
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Affiliation(s)
- Natalya S Petrova
- Laboratory of Nucleic Acids Biochemistry, Institute of Chemical Biology and Fundamental Medicine, SB RAS, Lavrentiev ave., 8, Novosibirsk 630090, Russia
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Abstract
BACKGROUND Ligand targeted therapy (LTT) is a powerful pharmaceutical strategy to achieve selective drug delivery to pathological cells, for both therapeutic and diagnostic purposes, with the advantage of limited side effects and toxicity. This active drug targeting approach is based on the discovery that there are receptors overexpressed on pathological cells, compared to their expression in normal tissues. PURPOSE The purpose of this article is to review recently published data on LTT with applications, both in the field of cancer therapy and other diseases. Moreover, data on LTT exploiting receptors overexpressed at cytoplasmatic level are also reviewed. METHODS Data were deduced from Medline (PubMed) and SciFinder and their selections were made with preference to papers where the most relevant receptors were involved. RESULTS Several groups have reported improved delivery of targeted nanocarriers, as compared to nontargeted ones, to pathological cells. LTT offers several advantages, but there are also limitations in the development of this strategy. Moreover, LTT have shown encouraging results in in vitro and in animal models in vivo; hence their clinical potential awaits investigation. CONCLUSION Recent studies highlight that the ligand density plays an important role in targeting efficacy. Furthermore, LTT applications in diseases different from cancer and those exploiting receptors overexpressed at cytoplasmatic level are growing.
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Troiber C, Wagner E. Nucleic Acid Carriers Based on Precise Polymer Conjugates. Bioconjug Chem 2011; 22:1737-52. [DOI: 10.1021/bc200251r] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Christina Troiber
- Pharmaceutical Biotechnology, Center for System-based Drug Research and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Ernst Wagner
- Pharmaceutical Biotechnology, Center for System-based Drug Research and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Butenandtstrasse 5-13, 81377 Munich, Germany
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Invading target cells: multifunctional polymer conjugates as therapeutic nucleic acid carriers. Front Chem Sci Eng 2011. [DOI: 10.1007/s11705-011-1203-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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