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Ahmad A, Khan JM, Paray BA, Rashid K, Parvez A. Endolysosomal trapping of therapeutics and endosomal escape strategies. Drug Discov Today 2024; 29:104070. [PMID: 38942071 DOI: 10.1016/j.drudis.2024.104070] [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: 11/08/2023] [Revised: 05/31/2024] [Accepted: 06/24/2024] [Indexed: 06/30/2024]
Abstract
Internalizing therapeutic molecules or genes into cells and safely delivering them to the target tissue where they can perform the intended tasks is one of the key characteristics of the smart gene/drug delivery vector. Despite much research in this field, endosomal escape continues to be a significant obstacle to the development of effective gene/drug delivery systems. In this review, we discuss in depth the several types of endocytic pathways involved in the endolysosomal trapping of therapeutic agents. In addition, we describe numerous mechanisms involved in nanoparticle endosomal escape. Furthermore, many other techniques are employed to increase endosomal escape to minimize entrapment of therapeutic compounds within endolysosomes, which have been reviewed at length in this study.
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Affiliation(s)
- Aqeel Ahmad
- Department of Medical Biochemistry, College of Medicine, Shaqra University, Shaqra 11961, Saudi Arabia.
| | - Javed Masood Khan
- Department of Food Science and Nutrition, Faculty of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia
| | - Bilal Ahamad Paray
- Department of Zoology, College of Science, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
| | - Khalid Rashid
- Department of Urology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Ashib Parvez
- Department of Community Medicine, F.H. Medical College, Atal Bihari Vajpayee Medical University, Etmadpur, Agra, India
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2
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Loya PR, Nikhade PP, Paul P, Reche A. Be Smart and Active in Conservative Dentistry and Endodontics. Cureus 2023; 15:e47185. [PMID: 38021683 PMCID: PMC10652228 DOI: 10.7759/cureus.47185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 10/17/2023] [Indexed: 12/01/2023] Open
Abstract
Numerous aspects of dentistry have been transformed by smart materials. In recent years, there have been advancements in dental materials that exhibit improved biological compatibility. These materials are specifically designed to interact effectively with the fluids found in the oral cavity, including saliva and gingival crevicular fluids. The search for the optimum restorative material results in the development of a more recent generation of dental materials known as smart materials. Smart materials react to stimuli, including stress, temperature, moisture, pH, electric field, and magnetic field, in a regulated way. Some of them are biomimetic and can imitate the dentin and enamel seen in natural teeth. These resources herald the start of a new era in dentistry known as "Smart Dentistry," and they project a promising future in terms of improved dependability and efficiency. These types of diverse materials can pick up and perform definite functionalities regarding adjustments in the nearby surroundings. Based on their capacity for recognition, analysis, and discrimination, these materials might be able to foresee problems in the near future. The superior biocompatibilities of smart materials, which have brought about a new generation of biosmart dentistry, are a crucial component of their utilization in numerous dental applications. We should use any material with intelligence as we progress in innovation and advanced technology. Additionally, we should purposefully incorporate intelligence into existing materials through design. Smart materials have proven advantageous in the field of dentistry, particularly in restorative applications. Various dental products, including smart composites, resin-modified glass ionomer materials, pit, and fissure sealants releasing amorphous calcium phosphate (ACP), smart ceramics, and compomers have all witnessed positive advancements due to the integration of smart materials.
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Affiliation(s)
- Parul R Loya
- Public Health Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Pradnya P Nikhade
- Conservative Dentistry and Endodontics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Priyanka Paul
- Public Health Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Amit Reche
- Public Health Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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3
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Yu Y, Yu T, Wang X, Liu D. Functional Hydrogels and Their Applications in Craniomaxillofacial Bone Regeneration. Pharmaceutics 2022; 15:pharmaceutics15010150. [PMID: 36678779 PMCID: PMC9864650 DOI: 10.3390/pharmaceutics15010150] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/26/2022] [Accepted: 12/28/2022] [Indexed: 01/03/2023] Open
Abstract
Craniomaxillofacial bone defects are characterized by an irregular shape, bacterial and inflammatory environment, aesthetic requirements, and the need for the functional recovery of oral-maxillofacial areas. Conventional clinical treatments are currently unable to achieve high-quality craniomaxillofacial bone regeneration. Hydrogels are a class of multifunctional platforms made of polymers cross-linked with high water content, good biocompatibility, and adjustable physicochemical properties for the intelligent delivery of goods. These characteristics make hydrogel systems a bright prospect for clinical applications in craniomaxillofacial bone. In this review, we briefly demonstrate the properties of hydrogel systems that can come into effect in the field of bone regeneration. In addition, we summarize the hydrogel systems that have been developed for craniomaxillofacial bone regeneration in recent years. Finally, we also discuss the prospects in the field of craniomaxillofacial bone tissue engineering; these discussions can serve as an inspiration for future hydrogel design.
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Affiliation(s)
- Yi Yu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
- National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China
- Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Tingting Yu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
- National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China
- Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Xing Wang
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Correspondence: (X.W.); (D.L.)
| | - Dawei Liu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
- National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China
- Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
- Correspondence: (X.W.); (D.L.)
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Maloo LM, Patel A, Toshniwal SH, Bagde AD. Smart Materials Leading to Restorative Dentistry: An Overview. Cureus 2022; 14:e30789. [PMID: 36457623 PMCID: PMC9705074 DOI: 10.7759/cureus.30789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 10/28/2022] [Indexed: 02/22/2023] Open
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Novel Gels: An Emerging Approach for Delivering of Therapeutic Molecules and Recent Trends. Gels 2022; 8:gels8050316. [PMID: 35621614 PMCID: PMC9140900 DOI: 10.3390/gels8050316] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/16/2022] [Accepted: 05/17/2022] [Indexed: 12/17/2022] Open
Abstract
Gels are semisolid, homogeneous systems with continuous or discrete therapeutic molecules in a suitable lipophilic or hydrophilic three-dimensional network base. Innovative gel systems possess multipurpose applications in cosmetics, food, pharmaceuticals, biotechnology, and so forth. Formulating a gel-based delivery system is simple and the delivery system enables the release of loaded therapeutic molecules. Furthermore, it facilitates the delivery of molecules via various routes as these gel-based systems offer proximal surface contact between a loaded therapeutic molecule and an absorption site. In the past decade, researchers have potentially explored and established a significant understanding of gel-based delivery systems for drug delivery. Subsequently, they have enabled the prospects of developing novel gel-based systems that illicit drug release by specific biological or external stimuli, such as temperature, pH, enzymes, ultrasound, antigens, etc. These systems are considered smart gels for their broad applications. This review reflects the significant role of advanced gel-based delivery systems for various therapeutic benefits. This detailed discussion is focused on strategies for the formulation of different novel gel-based systems, as well as it highlights the current research trends of these systems and patented technologies.
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Roki N, Solomon M, Casta L, Bowers J, Getts RC, Muro S. A method to improve quantitative radiotracing-based analysis of the in vivo biodistribution of drug carriers. Bioeng Transl Med 2021; 6:e10208. [PMID: 34027094 PMCID: PMC8126812 DOI: 10.1002/btm2.10208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/27/2020] [Accepted: 11/29/2020] [Indexed: 11/20/2022] Open
Abstract
Biodistribution studies are essential in drug carrier design and translation, and radiotracing provides a sensitive quantitation for this purpose. Yet, for biodegradable formulations, small amounts of free-label signal may arise prior to or immediately after injection in animal models, causing potentially confounding biodistribution results. In this study, we refined a method to overcome this obstacle. First, we verified free signal generation in animal samples and then, mimicking it in a controllable setting, we injected mice intravenously with a radiolabeled drug carrier formulation (125I-antibody/3DNA) containing a known amount of free radiolabel (125I), or free 125I alone as a control. Corrected biodistribution data were obtained by separating the free radiolabel from blood and organs postmortem, using trichloroacetic acid precipitation, and subtracting the confounding signal from each tissue measurement. Control free 125I-radiolabel was detected at ≥85% accuracy in blood and tissues, validating the method. It biodistributed very heterogeneously among organs (0.6-39 %ID/g), indicating that any free 125I generated in the body or present in an injected formulation cannot be simply corrected to the free-label fraction in the original preparation, but the free label must be empirically measured in each organ. Application of this method to the biodistribution of 125I-antibody/3DNA, including formulations directed to endothelial target ICAM-1, showed accurate classification of free 125I species in blood and tissues. In addition, this technique rendered data on the in vivo degradation of the traced agents over time. Thus, this is a valuable technique to obtain accurate measurements of biodistribution using 125I and possibly other radiotracers.
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Affiliation(s)
- Nikša Roki
- Fischell Department of BioengineeringUniversity of MarylandCollege ParkMarylandUSA
- Institute for Bioscience and Biotechnology Research, University of MarylandCollege ParkMarylandUSA
| | - Melani Solomon
- Institute for Bioscience and Biotechnology Research, University of MarylandCollege ParkMarylandUSA
| | - Lou Casta
- Genisphere, LLCHatfieldPennsylvaniaUSA
| | | | - Robert C. Getts
- Genisphere, LLCHatfieldPennsylvaniaUSA
- Present address:
Code Biotherapeutics, Hatfield, PennsylvaniaUSA
| | - Silvia Muro
- Institute for Bioscience and Biotechnology Research, University of MarylandCollege ParkMarylandUSA
- Institute for Bioengineering of Catalonia of the Barcelona Institute of Science and TechnologyBarcelonaSpain
- Institution of Catalonia for Research and Advanced StudiesBarcelonaSpain
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Sizikov AA, Kharlamova MV, Nikitin MP, Nikitin PI, Kolychev EL. Nonviral Locally Injected Magnetic Vectors for In Vivo Gene Delivery: A Review of Studies on Magnetofection. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1078. [PMID: 33922066 PMCID: PMC8143545 DOI: 10.3390/nano11051078] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/19/2021] [Accepted: 04/19/2021] [Indexed: 12/20/2022]
Abstract
Magnetic nanoparticles have been widely used in nanobiomedicine for diagnostics and the treatment of diseases, and as carriers for various drugs. The unique magnetic properties of "magnetic" drugs allow their delivery in a targeted tumor or tissue upon application of a magnetic field. The approach of combining magnetic drug targeting and gene delivery is called magnetofection, and it is very promising. This method is simple and efficient for the delivery of genetic material to cells using magnetic nanoparticles controlled by an external magnetic field. However, magnetofection in vivo has been studied insufficiently both for local and systemic routes of magnetic vector injection, and the relevant data available in the literature are often merely descriptive and contradictory. In this review, we collected and systematized the data on the efficiency of the local injections of magnetic nanoparticles that carry genetic information upon application of external magnetic fields. We also investigated the efficiency of magnetofection in vivo, depending on the structure and coverage of magnetic vectors. The perspectives of the development of the method were also considered.
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Affiliation(s)
- Artem A. Sizikov
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (A.A.S.); (M.V.K.); (M.P.N.)
| | - Marianna V. Kharlamova
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (A.A.S.); (M.V.K.); (M.P.N.)
| | - Maxim P. Nikitin
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (A.A.S.); (M.V.K.); (M.P.N.)
- Sirius University of Science and Technology, 354340 Sochi, Russia
| | - Petr I. Nikitin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 117942 Moscow, Russia
| | - Eugene L. Kolychev
- Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia; (A.A.S.); (M.V.K.); (M.P.N.)
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8
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Nie C, Chu X, Pan Q, Zhang J, Hu Y, Yi J, He M, He M, Chen T, Chu X. Engineering a Biodegradable Nanocarrier for Enhancing the Response of T98G Cells to Temozolomide. ACS APPLIED BIO MATERIALS 2020; 3:3337-3344. [PMID: 35025376 DOI: 10.1021/acsabm.0c00253] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Temozolomide (TMZ), the most common DNA alkylating agent, is predominantly mediated by O6-methylguanine DNA lesions for the treatment of glioblastoma (GBM). When O6-methylguanine-DNA methyltransferase (MGMT) is present, TMZ-induced O6-methylguanine lesions are repaired, resulting in the emergence of resistance to chemotherapy. Herein, we attempted to enhance the response of T98G cells to TMZ by gene silencing of MGMT. In this work, we developed transition metal manganese (Mn)-doped mesoporous silica nanoparticles (MSNs) as a carrier system for the co-delivery of TMZ and 10-23 DNAzyme, and realized gene silencing to enhance the TMZ sensitivity in T98G cells. The intelligent theranostic platform based on manganese-doped mesoporous silica nanoparticles (Mn-MSNs) can be decomposed and release chemotherapy drugs under acidic pH and reducing conditions. Meanwhile, the produced Mn2+ could act as a cofactor of 10-23 DNAzyme to effectively cleave MGMT mRNA, knock down MGMT protein, and sensitize T98G cells to TMZ-induced apoptosis. By co-delivering TMZ and 10-23 DNAzyme employing Mn-MSNs, the concentrations of TMZ that needed to inhibit cell growth by 50% (IC50 values) decreased (by more than 3.8-fold) compared with free TMZ. This work shows that the designed platform holds great promise for advancing the treatment of drug-resistant cancer.
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Affiliation(s)
- Cunpeng Nie
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ximing Chu
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Qingshan Pan
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Juan Zhang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Yanlei Hu
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Jintao Yi
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Manman He
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Mengyun He
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Tingting Chen
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Xia Chu
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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Kopytynski M, Chen S, Legg S, Minter R, Chen R. A Versatile Polymer‐Based Platform for Intracellular Delivery of Macromolecules. ADVANCED THERAPEUTICS 2019. [DOI: 10.1002/adtp.201900169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michal Kopytynski
- Department of Chemical EngineeringImperial College London South Kensington Campus London SW7 2AZ UK
| | - Siyuan Chen
- Department of Chemical EngineeringImperial College London South Kensington Campus London SW7 2AZ UK
| | - Sandrine Legg
- Department of Antibody Discovery and Protein EngineeringAstraZeneca Milstein Building, Granta Park Cambridge CB21 6GH UK
| | - Ralph Minter
- Department of Antibody Discovery and Protein EngineeringAstraZeneca Milstein Building, Granta Park Cambridge CB21 6GH UK
| | - Rongjun Chen
- Department of Chemical EngineeringImperial College London South Kensington Campus London SW7 2AZ UK
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10
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Strategies in the design of endosomolytic agents for facilitating endosomal escape in nanoparticles. Biochimie 2019; 160:61-75. [DOI: 10.1016/j.biochi.2019.02.012] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 02/19/2019] [Indexed: 12/23/2022]
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11
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Cardioprotective microRNAs: Lessons from stem cell-derived exosomal microRNAs to treat cardiovascular disease. Atherosclerosis 2019; 285:1-9. [PMID: 30939341 DOI: 10.1016/j.atherosclerosis.2019.03.016] [Citation(s) in RCA: 136] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 02/28/2019] [Accepted: 03/21/2019] [Indexed: 12/20/2022]
Abstract
The stem cell-based therapy has emerged as a promising therapeutic strategy for treating cardiovascular ischemic diseases (CVIDs), such as myocardial infarction (MI). However, some important functional shortcomings of stem cell transplantation, such as immune rejection, tumorigenicity and infusional toxicity, have overshadowed stem cell therapy in the setting of cardiovascular diseases (CVDs). Accumulating evidence suggests that the therapeutic effects of transplanted stem cells are predominately mediated by secreting paracrine factors, importantly, microRNAs (miRs) present in the secreted exosomes. Therefore, novel cell-free therapy based on the stem cell-secreted exosomal miRs can be considered as a safe and effective alternative tool to stem cell therapy for the treatment of CVDs. Stem cell-derived miRs have recently been found to transfer, via exosomes, from a transplanted stem cell into a recipient cardiac cell, where they regulate various cellular process, such as proliferation, apoptosis, stress responses, as well as differentiation and angiogenesis. The present review aimed to summarize cardioprotective exosomal miRs secreted by transplanted stem cells from various sources, including embryonic stem cells (ESCs), induced pluripotent stem cells (iPSCs), mesenchymal stem cells (MSCs), and cardiac stem/progenitor cells, which showed beneficial modulatory effects on the myocardial infracted heart. In summary, stem cell-exosomal miRs, including miR-19a, mirR-21, miR-21-5p, miR-21-a5p, miR-22 miR-24, miR-26a, miR-29, miR-125b-5p, miR-126, miR-201, miR-210, and miR-294, have been shown to have cardioprotective effects by enhancing cardiomyocyte survival and function and attenuating cardiac fibrosis. Additionally, MCS-exosomal miRs, including miR-126, miR-210, miR-21, miR-23a-3p and miR-130a-3p, are found to exert cardioprotective effects through induction of angiogenesis in ischemic heart after MI.
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12
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Yuan Y, Du W, Liu J, Ma W, Zhang L, Du Z, Cai B. Stem Cell-Derived Exosome in Cardiovascular Diseases: Macro Roles of Micro Particles. Front Pharmacol 2018; 9:547. [PMID: 29904347 PMCID: PMC5991072 DOI: 10.3389/fphar.2018.00547] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 05/08/2018] [Indexed: 12/15/2022] Open
Abstract
The stem cell-based therapy has emerged as the promising therapeutic strategies for cardiovascular diseases (CVDs). Recently, increasing evidence suggest stem cell-derived active exosomes are important communicators among cells in the heart via delivering specific substances to the adjacent/distant target cells. These exosomes and their contents such as certain proteins, miRNAs and lncRNAs exhibit huge beneficial effects on preventing heart damage and promoting cardiac repair. More importantly, stem cell-derived exosomes are more effective and safer than stem cell transplantation. Therefore, administration of stem cell-derived exosomes will expectantly be an alternative stem cell-based therapy for the treatment of CVDs. Furthermore, modification of stem cell-derived exosomes or artificial synthesis of exosomes will be the new therapeutic tools for CVDs in the future. In addition, stem cell-derived exosomes also have been implicated in the diagnosis and prognosis of CVDs. In this review, we summarize the current advances of stem cell-derived exosome-based treatment and prognosis for CVDs, including their potential benefits, underlying mechanisms and limitations, which will provide novel insights of exosomes as a new tool in clinical therapeutic translation in the future.
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Affiliation(s)
- Ye Yuan
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
| | - Weijie Du
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
| | - Jiaqi Liu
- Department of Pharmacology, College of Pharmacy, Mudanjiang Medical University, Mudanjiang, China
| | - Wenya Ma
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
| | - Lai Zhang
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
| | - Zhimin Du
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
| | - Benzhi Cai
- Department of Clinical Pharmacy, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
- Department of Pharmacology, College of Pharmacy, Harbin Medical University, Harbin, China
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13
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Fernando LP, Lewis JS, Evans BC, Duvall CL, Keselowsky BG. Formulation and characterization of poly(propylacrylic acid)/poly(lactic-co-glycolic acid) blend microparticles for pH-dependent membrane disruption and cytosolic delivery. J Biomed Mater Res A 2017; 106:1022-1033. [PMID: 29164777 DOI: 10.1002/jbm.a.36298] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 09/22/2017] [Accepted: 10/17/2017] [Indexed: 01/15/2023]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) is widely used as a vehicle for delivery of pharmaceutically relevant payloads. PLGA is readily fabricated as a nano- or microparticle (MP) matrix to load both hydrophobic and hydrophilic small molecular drugs as well as biomacromolecules such as nucleic acids and proteins. However, targeting such payloads to the cell cytosol is often limited by MP entrapment and degradation within acidic endolysosomes. Poly(propylacrylic acid) (PPAA) is a polyelectrolyte polymer with the membrane disruptive capability triggered at low pH. PPAA has been previously formulated in various carrier configurations to enable cytosolic payload delivery, but requires sophisticated carrier design. Taking advantage of PPAA functionality, we have incorporated PPAA into PLGA MPs as a simple polymer mixture to enhance cytosolic delivery of PLGA-encapsulated payloads. Rhodamine loaded PLGA and PPAA/PLGA blend MPs were prepared by a modified nanoprecipitation method. Incorporation of PPAA into PLGA MPs had little to no effect on the size, shape, or loading efficiency, and evidenced no toxicity in Chinese hamster ovary epithelial cells. Notably, incorporation of PPAA into PLGA MPs enabled pH-dependent membrane disruption in a hemolysis assay, and a three-fold increased endosomal escape and cytosolic delivery in dendritic cells after 2 h of MP uptake. These results demonstrate that a simple PLGA/PPAA polymer blend is readily fabricated into composite MPs, enabling cytosolic delivery of an encapsulated payload. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1022-1033, 2018.
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Affiliation(s)
- Lawrence P Fernando
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida
| | - Jamal S Lewis
- Department of Biomedical Engineering, University of California, Davis, Davis, California
| | - Brian C Evans
- Division of Vascular Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Craig L Duvall
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee
| | - Benjamin G Keselowsky
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida
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14
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Khan F, Tanaka M. Designing Smart Biomaterials for Tissue Engineering. Int J Mol Sci 2017; 19:E17. [PMID: 29267207 PMCID: PMC5795968 DOI: 10.3390/ijms19010017] [Citation(s) in RCA: 146] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 11/30/2017] [Accepted: 12/01/2017] [Indexed: 01/10/2023] Open
Abstract
The engineering of human tissues to cure diseases is an interdisciplinary and a very attractive field of research both in academia and the biotechnology industrial sector. Three-dimensional (3D) biomaterial scaffolds can play a critical role in the development of new tissue morphogenesis via interacting with human cells. Although simple polymeric biomaterials can provide mechanical and physical properties required for tissue development, insufficient biomimetic property and lack of interactions with human progenitor cells remain problematic for the promotion of functional tissue formation. Therefore, the developments of advanced functional biomaterials that respond to stimulus could be the next choice to generate smart 3D biomimetic scaffolds, actively interacting with human stem cells and progenitors along with structural integrity to form functional tissue within a short period. To date, smart biomaterials are designed to interact with biological systems for a wide range of biomedical applications, from the delivery of bioactive molecules and cell adhesion mediators to cellular functioning for the engineering of functional tissues to treat diseases.
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Affiliation(s)
- Ferdous Khan
- Soft-Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan.
| | - Masaru Tanaka
- Soft-Materials Chemistry, Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan.
- Frontier Center for Organic Materials, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
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15
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Solomon M, Muro S. Lysosomal enzyme replacement therapies: Historical development, clinical outcomes, and future perspectives. Adv Drug Deliv Rev 2017; 118:109-134. [PMID: 28502768 PMCID: PMC5828774 DOI: 10.1016/j.addr.2017.05.004] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/26/2017] [Accepted: 05/08/2017] [Indexed: 01/06/2023]
Abstract
Lysosomes and lysosomal enzymes play a central role in numerous cellular processes, including cellular nutrition, recycling, signaling, defense, and cell death. Genetic deficiencies of lysosomal components, most commonly enzymes, are known as "lysosomal storage disorders" or "lysosomal diseases" (LDs) and lead to lysosomal dysfunction. LDs broadly affect peripheral organs and the central nervous system (CNS), debilitating patients and frequently causing fatality. Among other approaches, enzyme replacement therapy (ERT) has advanced to the clinic and represents a beneficial strategy for 8 out of the 50-60 known LDs. However, despite its value, current ERT suffers from several shortcomings, including various side effects, development of "resistance", and suboptimal delivery throughout the body, particularly to the CNS, lowering the therapeutic outcome and precluding the use of this strategy for a majority of LDs. This review offers an overview of the biomedical causes of LDs, their socio-medical relevance, treatment modalities and caveats, experimental alternatives, and future treatment perspectives.
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Affiliation(s)
- Melani Solomon
- Institute for Bioscience and Biotechnology Research, University Maryland, College Park, MD 20742, USA
| | - Silvia Muro
- Institute for Bioscience and Biotechnology Research, University Maryland, College Park, MD 20742, USA; Fischell Department of Bioengineering, University Maryland, College Park, MD 20742, USA.
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16
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Yang L, Bracho‐Sanchez E, Fernando LP, Lewis JS, Carstens MR, Duvall CL, Keselowsky BG. Poly(2-propylacrylic acid)/poly(lactic-co-glycolic acid) blend microparticles as a targeted antigen delivery system to direct either CD4 + or CD8 + T cell activation. Bioeng Transl Med 2017; 2:202-211. [PMID: 29313030 PMCID: PMC5675098 DOI: 10.1002/btm2.10068] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 04/24/2017] [Accepted: 06/18/2017] [Indexed: 01/06/2023] Open
Abstract
Poly(lactic-co-glycolic acid) (PLGA) based microparticles (MPs) are widely investigated for their ability to load a range of molecules with high efficiency, including antigenic proteins, and release them in a controlled manner. Micron-sized PLGA MPs are readily phagocytosed by antigen presenting cells, and localized to endosomes. Due to low pH and digestive enzymes, encapsulated protein cargo is largely degraded and processed in endosomes for MHC-II loading and presentation to CD4+ T cells, with very little antigen delivered into the cytosol, limiting MHC-I antigenic loading and presentation to CD8+ T cells. In this work, PLGA was blended with poly(2-propylacrylic acid) (PPAA), a membrane destabilizing polymer, in order to incorporate an endosomal escape strategy into PLGA MPs as an easily fabricated platform with diverse loading capabilities, as a means to enable antigen presentation to CD8+ T cells. Ovalbumin (OVA)-loaded MPs were fabricated using a water-in-oil double emulsion with a 0% (PLGA only), 3 and 10% PPAA composition. MPs were subsequently determined to have an average diameter of 1 µm, with high loading and a release profile characteristic of PLGA. Bone marrow derived dendritic cells (DCs) were then incubated with MPs in order to evaluate localization, processing, and presentation of ovalbumin. Endosomal escape of OVA was observed only in DC groups treated with PPAA/PLGA blends, which promoted high levels of activation of CD8+ OVA-specific OT-I T cells, compared to DCs treated with OVA-loaded PLGA MPs which were unable activate CD8+ T cells. In contrast, DCs treated with OVA-loaded PLGA MPs promoted OVA-specific OT-II CD4+ T cell activation, whereas PPAA incorporation into the MP blend did not permit CD4+ T cell activation. These studies demonstrate PLGA MP blends containing PPAA are able to provide an endosomal escape strategy for encapsulated protein antigen, enabling the targeted delivery of antigen for tunable presentation and activation of either CD4+ or CD8+ T cells.
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Affiliation(s)
- Lirong Yang
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
| | - Evelyn Bracho‐Sanchez
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
| | - Lawrence P. Fernando
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
| | - Jamal S. Lewis
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
- Dept. of Biomedical EngineeringUniversity of CaliforniaDavis, CA 95616
| | - Matthew R. Carstens
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
| | - Craig L. Duvall
- Dept. of Biomedical EngineeringVanderbilt UniversityNashville, TN 37235
| | - Benjamin G. Keselowsky
- J. Crayton Pruitt Family Dept. of Biomedical Engineering, College of EngineeringUniversity of FloridaGainesville, FL 32611
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17
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Ljubimova JY, Sun T, Mashouf L, Ljubimov AV, Israel LL, Ljubimov VA, Falahatian V, Holler E. Covalent nano delivery systems for selective imaging and treatment of brain tumors. Adv Drug Deliv Rev 2017; 113:177-200. [PMID: 28606739 PMCID: PMC5578712 DOI: 10.1016/j.addr.2017.06.002] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/07/2017] [Indexed: 02/06/2023]
Abstract
Nanomedicine is a rapidly evolving form of therapy that holds a great promise for superior drug delivery efficiency and therapeutic efficacy than conventional cancer treatment. In this review, we attempt to cover the benefits and the limitations of current nanomedicines with special attention to covalent nano conjugates for imaging and drug delivery in the brain. The improvement in brain tumor treatment remains dismal despite decades of efforts in drug development and patient care. One of the major obstacles in brain cancer treatment is the poor drug delivery efficiency owing to the unique blood-brain barrier (BBB) in the CNS. Although various anti-cancer agents are available to treat tumors outside of the CNS, the majority fails to cross the BBB. In this regard, nanomedicines have increasingly drawn attention due to their multi-functionality and versatility. Nano drugs can penetrate BBB and other biological barriers, and selectively accumulate in tumor cells, while concurrently decreasing systemic toxicity.
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Affiliation(s)
- Julia Y Ljubimova
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA.
| | - Tao Sun
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA
| | - Leila Mashouf
- Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
| | - Alexander V Ljubimov
- Department of Biomedical Sciences, Board of Governors Regenerative Medicine Institute, Los Angeles, CA 90048, USA
| | - Liron L Israel
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA
| | - Vladimir A Ljubimov
- Department of Neurosurgery and Brain Repair, University of South Florida, 2 Tampa General Circle, Tampa, FL 33606, USA
| | - Vida Falahatian
- Duke University School of Medicine, Department of Biostatistics and Bioinformatics, Clinical Research Training Program (CRTP), 2424 Erwin Road, Suite 1102, Hock Plaza Box 2721, Durham, NC 27710, USA
| | - Eggehard Holler
- Nanomedicine Research Center, Department of Neurosurgery, Cedars-Sinai Medical Center, 8700 Beverly Blvd., AHSP, Los Angeles, CA 90048, USA; Institut für Biophysik und Physikalische Biochemie, Universität Regensburg, D-93040 Regensburg, Germany
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18
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Li Y, Gao J, Zhang C, Cao Z, Cheng D, Liu J, Shuai X. Stimuli-Responsive Polymeric Nanocarriers for Efficient Gene Delivery. Top Curr Chem (Cham) 2017; 375:27. [DOI: 10.1007/s41061-017-0119-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 01/31/2017] [Indexed: 11/25/2022]
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19
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Stolzoff M, Ekladious I, Colby AH, Colson YL, Porter TM, Grinstaff MW. Synthesis and Characterization of Hybrid Polymer/Lipid Expansile Nanoparticles: Imparting Surface Functionality for Targeting and Stability. Biomacromolecules 2015; 16:1958-66. [PMID: 26053219 DOI: 10.1021/acs.biomac.5b00336] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The size, drug loading, drug release kinetics, localization, biodistribution, and stability of a given polymeric nanoparticle (NP) system depend on the composition of the NP core as well as its surface properties. In this study, novel, pH-responsive, and lipid-coated NPs, which expand in size from a diameter of approximately 100 to 1000 nm in the presence of a mildly acidic pH environment, are synthesized and characterized. Specifically, a combined miniemulsion and free-radical polymerization method is used to prepare the NPs in the presence of PEGylated lipids. These PEGylated-lipid expansile NPs (PEG-L-eNPs) combine the swelling behavior of the polymeric core of expansile NPs with the improved colloidal stability and surface functionality of PEGylated liposomes. The surface functionality of PEG-L-eNPs allows for the incorporation of folic acid (FA) and folate receptor-targeting. The resulting hybrid polymer/lipid nanocarriers, FA-PEG-L-eNPs, exhibit greater in vitro uptake and potency when loaded with paclitaxel compared to nontargeted PEG-L-eNPs.
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Affiliation(s)
| | | | | | - Yolonda L Colson
- §Division of Thoracic Surgery, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts 02115, United States
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20
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Muro S. Strategies for delivery of therapeutics into the central nervous system for treatment of lysosomal storage disorders. Drug Deliv Transl Res 2015; 2:169-86. [PMID: 24688886 DOI: 10.1007/s13346-012-0072-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Lysosomal storage disorders (LSDs) are a group of about fifty life-threatening conditions caused by genetic defects affecting lysosomal components. The underscoring molecular deficiency leads to widespread cellular dysfunction through most tissues in the body, including peripheral organs and the central nervous system (CNS). Efforts during the last few decades have rendered a remarkable advance regarding our knowledge, medical awareness, and early detection of these genetic defects, as well as development of several treatment modalities. Clinical and experimental strategies encompassing enzyme replacement, gene and cell therapies, substrate reduction, and chemical chaperones are showing considerable potential in attenuating the peripheral pathology. However, a major drawback has been encountered regarding the suboptimal impact of these approaches on the CNS pathology. Particular anatomical and biochemical constraints of this tissue pose a major obstacle to the delivery of therapeutics into the CNS. Approaches to overcome these obstacles include modalities of local administration, strategies to enhance the blood-CNS permeability, intranasal delivery, use of exosomes, and those exploiting targeting of transporters and transcytosis pathways in the endothelial lining. The later two approaches are being pursued at the time by coupling therapeutic agents to affinity moieties and drug delivery systems capable of targeting these natural transport routes. This approach is particularly promising, as using paths naturally active at this interface may render safe and effective delivery of LSD therapies into the CNS.
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Affiliation(s)
- Silvia Muro
- Institute for Bioscience and Biotechnology Research University of Maryland, College Park, MD, 20742, USA ; Fischell Dept. of Bioengineering, University of Maryland, College Park, MD, 20742, USA
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21
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Zein in controlled drug delivery and tissue engineering. J Control Release 2014; 189:108-22. [PMID: 24993426 DOI: 10.1016/j.jconrel.2014.06.036] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 06/20/2014] [Accepted: 06/21/2014] [Indexed: 01/10/2023]
Abstract
Controlled delivery of a bioactive to specific organ, cellular and sub-cellular level is a desired feature of a drug carrier system. In order to achieve this goal, formulation scientists search for better alternatives of biomaterials to deliver the therapeutics in more precise and controlled manner in vivo. Zein, a plant protein obtained from corn, is a useful biomaterial for several industrial applications including agriculture, cosmetics, packaging and pharmaceuticals. Being a hydrophobic protein, which is biodegradable, biocompatible, economic to use and with generally regarded safe "GRAS" status, it is an attractive biomaterial for human use. Novel biomedical applications of zein such as controlled and targeted delivery of bioactives and tissue engineering are the current research interests of the scientific fraternity. Here we attempt to review the literature on zein as a biopolymer for drug/vaccine/gene delivery and its applicability in tissue engineering.
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22
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Srivastava A, O’Connor IB, Pandit A, Gerard Wall J. Polymer-antibody fragment conjugates for biomedical applications. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2013.09.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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23
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Guidry EN, Farand J, Soheili A, Parish CA, Kevin NJ, Pipik B, Calati KB, Ikemoto N, Waldman JH, Latham AH, Howell BJ, Leone A, Garbaccio RM, Barrett SE, Parmar RG, Truong QT, Mao B, Davies IW, Colletti SL, Sepp-Lorenzino L. Improving the in vivo therapeutic index of siRNA polymer conjugates through increasing pH responsiveness. Bioconjug Chem 2014; 25:296-307. [PMID: 24409989 DOI: 10.1021/bc400442p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Polymer based carriers that aid in endosomal escape have proven to be efficacious siRNA delivery agents in vitro and in vivo; however, most suffer from cytotoxicity due in part to a lack of selectivity for endosomal versus cell membrane lysis. For polymer based carriers to move beyond the laboratory and into the clinic, it is critical to find carriers that are not only efficacious, but also have margins that are clinically relevant. In this paper we report three distinct categories of polymer conjugates that improve the selectivity of endosomal membrane lysis by relying on the change in pH associated with endosomal trafficking, including incorporation of low pKa heterocycles, acid cleavable amino side chains, or carboxylic acid pH sensitive charge switches. Additionally, we determine the therapeutic index of our polymer conjugates in vivo and demonstrate that the incorporation of pH responsive elements dramatically expands the therapeutic index to 10-15, beyond that of the therapeutic index (less than 3), for polymer conjugates previously reported.
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Affiliation(s)
- Erin N Guidry
- Department of Process Chemistry and ∥Department of Analytical Chemistry, Merck & Co. Inc. , , Rahway, New Jersey, United States
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24
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Christ GJ, Saul JM, Furth ME, Andersson KE. The pharmacology of regenerative medicine. Pharmacol Rev 2013; 65:1091-133. [PMID: 23818131 DOI: 10.1124/pr.112.007393] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Regenerative medicine is a rapidly evolving multidisciplinary, translational research enterprise whose explicit purpose is to advance technologies for the repair and replacement of damaged cells, tissues, and organs. Scientific progress in the field has been steady and expectations for its robust clinical application continue to rise. The major thesis of this review is that the pharmacological sciences will contribute critically to the accelerated translational progress and clinical utility of regenerative medicine technologies. In 2007, we coined the phrase "regenerative pharmacology" to describe the enormous possibilities that could occur at the interface between pharmacology, regenerative medicine, and tissue engineering. The operational definition of regenerative pharmacology is "the application of pharmacological sciences to accelerate, optimize, and characterize (either in vitro or in vivo) the development, maturation, and function of bioengineered and regenerating tissues." As such, regenerative pharmacology seeks to cure disease through restoration of tissue/organ function. This strategy is distinct from standard pharmacotherapy, which is often limited to the amelioration of symptoms. Our goal here is to get pharmacologists more involved in this field of research by exposing them to the tools, opportunities, challenges, and interdisciplinary expertise that will be required to ensure awareness and galvanize involvement. To this end, we illustrate ways in which the pharmacological sciences can drive future innovations in regenerative medicine and tissue engineering and thus help to revolutionize the discovery of curative therapeutics. Hopefully, the broad foundational knowledge provided herein will spark sustained conversations among experts in diverse fields of scientific research to the benefit of all.
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Affiliation(s)
- George J Christ
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27101, USA.
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25
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Colby AH, Colson YL, Grinstaff MW. Microscopy and tunable resistive pulse sensing characterization of the swelling of pH-responsive, polymeric expansile nanoparticles. NANOSCALE 2013; 5:3496-504. [PMID: 23487041 PMCID: PMC3878811 DOI: 10.1039/c3nr00114h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polymeric expansile nanoparticles (eNPs) that respond to a mildly acidic environment by swelling with water and expanding 2-10× in diameter represent a new responsive drug delivery system. Here, we use a variety of techniques to characterize the pH- and time-dependence of eNP swelling as this is a key property responsible for the observed in vitro and in vivo performance of eNPs. Results demonstrate a significant change in eNP volume (>350×) at pH 5.0 as seen using: scanning electron microscopy (SEM), conventional transmission electron microscopy (TEM), freeze-fracture transmission electron microscopy (ff-TEM), fluorescence microscopy, and a new nanopore based characterization technology, the qNano, which measures both individual particle size as well as overall particle concentration in situ using tunable resistive pulse sensing. eNP swelling occurs in a continuous and yet heterogeneous manner over several days and is pH dependent.
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Affiliation(s)
- Aaron H. Colby
- Boston University, Boston, MA. Fax: 617-358-3429; Tel: 617-353-3871
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26
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Samadi N, van Nostrum CF, Vermonden T, Amidi M, Hennink WE. Mechanistic Studies on the Degradation and Protein Release Characteristics of Poly(lactic-co-glycolic-co-hydroxymethylglycolic acid) Nanospheres. Biomacromolecules 2013; 14:1044-53. [DOI: 10.1021/bm301900t] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- N. Samadi
- Department of Pharmaceutics, Utrecht Institute for
Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - C. F. van Nostrum
- Department of Pharmaceutics, Utrecht Institute for
Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - T. Vermonden
- Department of Pharmaceutics, Utrecht Institute for
Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - M. Amidi
- Department of Pharmaceutics, Utrecht Institute for
Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - W. E. Hennink
- Department of Pharmaceutics, Utrecht Institute for
Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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27
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Ding H, Portilla-Arias J, Patil R, Black KL, Ljubimova JY, Holler E. Distinct mechanisms of membrane permeation induced by two polymalic acid copolymers. Biomaterials 2013; 34:217-25. [PMID: 23063368 PMCID: PMC3487713 DOI: 10.1016/j.biomaterials.2012.08.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 08/09/2012] [Indexed: 11/20/2022]
Abstract
Anionic polymers are valuable components used in cosmetics and health sciences, especially in drug delivery, because of their chemical versatility and low toxicity. However, because of their highly negative charge they pose problems for penetration through hydrophobic barriers such as membranes. We have engineered anionic polymalic acid (PMLA) to penetrate biological membranes. PMLA copolymers of leucine ethyl ester (P/LOEt) or trileucine (P/LLL) show either pH-independent or pH-dependent activity for membrane penetration. We report here for the first time on the mechanisms which are different for those two copolymers. Formation of hydrophobic patches in either copolymer is detected by fluorescence techniques. The copolymers display distinctly different properties in solution and during membranolysis. P/LOEt copolymer binds to membrane as single molecules with high affinity, and induces leakage cooperatively through a mechanism known as "carpet" model, in which the polymer aligns at the surface throughout the entire process of membrane permeation. In contrast, P/LLL self-assembles to form an oligomer of 105 nm in a pH-dependent manner (pKa 5.5) and induces membrane leakage through a two-phase process: the concentration dependent first-phase of insertion of the oligomer into membrane followed by a concentration independent second-phase of rearrangement of the membrane-oligomer complex. The insertion of P/LLL is facilitated by hydrophobic interactions between trileucine side chains and lipids in the membrane core, resulting in transmembrane pores, through mechanism known as "barrel-stave" model. The understanding of the mechanism paves the way for future engineering of polymeric delivery systems with optimal cytoplasmic delivery efficiency and reduced systemic toxicity.
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Affiliation(s)
- Hui Ding
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.
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28
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Muro S. Challenges in design and characterization of ligand-targeted drug delivery systems. J Control Release 2012; 164:125-37. [PMID: 22709588 PMCID: PMC3481020 DOI: 10.1016/j.jconrel.2012.05.052] [Citation(s) in RCA: 173] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Revised: 05/19/2012] [Accepted: 05/26/2012] [Indexed: 01/11/2023]
Abstract
Targeting of therapeutic agents to molecular markers expressed on the surface of cells requiring clinical intervention holds promise to improve specificity of delivery, enhancing therapeutic effects while decreasing potential damage to healthy tissues. Drug targeting to cellular receptors involved in endocytic transport facilitates intracellular delivery, a requirement for a number of therapeutic goals. However, after several decades of experimental design, there is still considerable controversy on the practical outcome of drug targeting strategies. The plethora of factors contributing to the relative efficacy of targeting makes the success of these approaches hardly predictable. Lack of fully specific targets, along with selection of targets with spatial and temporal expression well aligned to interventional requirements, pose difficulties to this process. Selection of adequate sub-molecular target epitopes determines accessibility for anchoring of drug conjugates and bulkier drug carriers, as well as proper signaling for uptake within the cell. Targeting design must adapt to physiological variables of blood flow, disease status, and tissue architecture by accommodating physicochemical parameters such as carrier composition, functionalization, geometry, and avidity. In many cases, opposite features need to meet a balance, e.g., sustained circulation versus efficient targeting, penetration through tissues versus uptake within cells, internalization within endocytic compartment to avoid efflux pumps versus accessibility to molecular targets within the cytosol, etc. Detailed characterization of these complex physiological factors and design parameters, along with a deep understanding of the mechanisms governing the interaction of targeted drugs and carriers with the biological environment, are necessary steps toward achieving efficient drug targeting systems.
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Affiliation(s)
- Silvia Muro
- Fischell Department of Bioengineering, School of Engineering, University of Maryland College Park, College Park, MD 20742, USA.
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29
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Prijic S, Prosen L, Cemazar M, Scancar J, Romih R, Lavrencak J, Bregar VB, Coer A, Krzan M, Znidarsic A, Sersa G. Surface modified magnetic nanoparticles for immuno-gene therapy of murine mammary adenocarcinoma. Biomaterials 2012; 33:4379-91. [PMID: 22429983 DOI: 10.1016/j.biomaterials.2012.02.061] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 02/16/2012] [Indexed: 11/27/2022]
Abstract
Cancer immuno-gene therapy is an introduction of nucleic acids encoding immunostimulatory proteins, such as cytokine interleukin 12 (IL-12), into somatic cells to stimulate an immune response against a tumor. Various methods can be used for the introduction of nucleic acids into cells; magnetofection involves binding of nucleic acids to magnetic nanoparticles with subsequent exposure to an external magnetic field. Here we show that surface modified superparamagnetic iron oxide nanoparticles (SPIONs) with a combination of polyacrylic acid (PAA) and polyethylenimine (PEI) (SPIONs-PAA-PEI) proved to be safe and effective for magnetofection of cells and tumors in mice. Magnetofection of cells with plasmid DNA encoding reporter gene using SPIONs-PAA-PEI was superior in transfection efficiency to commercially available SPIONs. Magnetofection of murine mammary adenocarcinoma with plasmid DNA encoding IL-12 using SPIONs-PAA-PEI resulted in significant antitumor effect and could be further refined for cancer immuno-gene therapy.
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Affiliation(s)
- Sara Prijic
- Kolektor Group, Nanotesla Institute, Ljubljana, Slovenia
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30
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Saito T, Tabata Y. Preparation of gelatin hydrogels incorporating low-molecular-weight heparin for anti-fibrotic therapy. Acta Biomater 2012; 8:646-52. [PMID: 22079782 DOI: 10.1016/j.actbio.2011.10.025] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 09/20/2011] [Accepted: 10/17/2011] [Indexed: 12/25/2022]
Abstract
The objective of this study is to design biodegradable hydrogels for the controlled release of low-molecular-weight heparin (LMWH) and evaluate the biological activity. Gelatin was cationized by chemically introducing ethylene diamine into the carboxyl groups in different conditions to obtain cationized gelatins. The cationized gelatin was mixed with the LMWH in aqueous solution to form the complex. Gelatin, together with the complex of LMWH and cationized gelatin, was dehydrothermally cross-linked for different time periods to prepare the gelatin hydrogel-incorporating complex. The hydrogel-incorporating complex was neither degraded in phosphate-buffered saline solution (PBS) at 37 °C nor did it release the LMWH complex. When placed in PBS containing collagenase, the hydrogel was enzymatically degraded to release the LMWH complex. The time profile of hydrogel degradation and the LMWH release depended on the condition of hydrogel cross-linking. The longer the cross-linking time period, the slower the hydrogel degradation and the subsequent LMWH release. The half-life period of LMWH release was in good correspondence with that of hydrogel degradation. It is possible that the LMWH was released as the result of hydrogel degradation. When applied to the mouse model of abdominal membrane fibrosis, the hydrogel system of LMWH release showed a promising anti-fibrotic effect.
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31
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Garnacho C, Serrano D, Muro S. A fibrinogen-derived peptide provides intercellular adhesion molecule-1-specific targeting and intraendothelial transport of polymer nanocarriers in human cell cultures and mice. J Pharmacol Exp Ther 2011; 340:638-47. [PMID: 22160267 DOI: 10.1124/jpet.111.185579] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Intercellular adhesion molecule-1 (ICAM-1), a transmembrane glycoprotein expressed on activated endothelium and many other cells, represents a suitable target for delivery of drug nanocarriers (NCs) to disease areas. Numerous works have shown efficient targeting and intracellular transport of ICAM-1-targeted NCs, rendering significant therapeutic potential. This is the case for enzyme delivery for treatment of multitissue lysosomal storage disorders. However, those studies used formulations targeted to ICAM-1 by antibodies (anti-ICAM NCs). This poses an obstacle to preclinical evaluation of long-term treatment of such chronic maladies, caused by immunogenicity of foreign proteins administered to animals, compelling development of alternative strategies. In this work, we used radioisotope tracing, fluorescence and electron microscopy, and in vitro, cell cultures, and mouse models to evaluate polymer nanocarriers targeted to ICAM-1 by a 17-mer linear peptide derived from the ICAM-1-binding sequence of fibrinogen (γ3). Our results show that γ3 NCs target ICAM-1 with efficiency and specificity similar to that of anti-ICAM NCs, determined by using immobilized ICAM-1, native ICAM-1 expressed on endothelial cell cultures, and intravenous administration in mice. Furthermore, γ3 NCs are internalized by cells in culture and in vivo and transported to lysosomes via cell adhesion molecule-mediated endocytosis, without apparent disruption of cell junctions, similar to anti-ICAM counterparts. The degree of conservation of fibrinogen γ3 sequence and its cognate site on ICAM-1 among species (e.g., mouse, chimpanzee, and humans) reflects the interspecies targeting found for γ3 NCs, providing an avenue for exploring the translation of ICAM-1-targeting platforms in the preclinical and, perhaps, future clinical realm.
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Affiliation(s)
- Carmen Garnacho
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742-4450, USA
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Abstract
Most dental materials are designed to have a relatively 'neutral' existence in the mouth. It is considered that if they are 'passive' and do not react with the oral environment they will be more stable and have a greater durability. At the same time, it is hoped that our materials will be well accepted and will cause neither harm nor injury. This is an entirely negative approach to material tolerance and biocompatibility and hides the possibility that some positive gains can be achieved by using materials which behave in a more dynamic fashion in the environment in which they are placed. An example of materials which have potential for 'dynamic' behaviour exists with structures which are partly water-based or have phases or zones with significant water content and for which the water within the material can react to changes in the ambient conditions. Such materials may even be said to have the potential for 'smart' behaviour, i.e. they can react to changes in the environment to bring about advantageous changes in properties, either within the material itself or in the material-tooth complex. The controlled movement of water or aqueous media through the material may cause changes in dimensions, may be the carrier for various dissolved species, and may influence the potential for the formation of biofilms at the surface. Some of these issues may be closely interrelated. Clearly, materials which do not have the capacity for water transport or storage do not have the potential for this sort of behaviour. Some materials which are normally resistant to the healthy oral environment can undergo controlled degradation at low pH in order to release ions which may prove beneficial or protective. It is doubtful whether such behaviour should be classified as 'smart' because the material cannot readily return to its original condition when the stimulus is removed. Other materials, such as certain alloys, having no means of transporting water through their structure, can display smart behaviour by undergoing predictable changes in structure in response to applied mechanical or thermal stimuli. It has been difficult to harness such behaviour to the benefit of patients but progress in this area is slowly being made.
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Affiliation(s)
- J F McCabe
- School of Dental Sciences, Newcastle University, United Kingdom.
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Ding H, Portilla-Arias J, Patil R, Black KL, Ljubimova JY, Holler E. The optimization of polymalic acid peptide copolymers for endosomolytic drug delivery. Biomaterials 2011; 32:5269-78. [PMID: 21514661 PMCID: PMC4110056 DOI: 10.1016/j.biomaterials.2011.03.073] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Accepted: 03/29/2011] [Indexed: 11/29/2022]
Abstract
Membranolytic macromolecules are promising vehicles for cytoplasmic drug delivery, but their efficiency and safety remains primary concerns. To address those concerns, membranolytic properties of various poly(β-L-malic acid) (PMLA) copolymers were extensively investigated as a function of concentration and pH. PMLA, a naturally occurring biodegradable polymer, acquires membranolytic activities after substitution of pendent carboxylates with hydrophobic amino acid derivatives. Ruled by hydrophobization and charge neutralization, membranolysis of PMLA copolymers increased as a function of polymer molecular weight and demonstrated a maximum with 50% substitution of carboxylates. Charge neutralization was achieved either conditionally by pH-dependent protonation or permanently by masking carboxylates. Membranolysis of PMLA copolymers containing tripeptides of leucine, tryptophan and phenylalanine were pH-dependent in contrast to pH-independent copolymers of Leucine ethyl ester and Leu-Leu-Leu-NH(2) with permanent charge neutralization. PMLA and tripeptides seemed a unique combination for pH-dependent membranolysis. In contrast to nontoxic pH-dependent PMLA copolymers, pH-independent copolymers were found toxic at high concentration, which is ascribed to their nonspecific disruption of plasma membrane at physiological pH. pH-Dependent copolymers were membranolytically active only at acidic pH typical of maturating endosomes, and are thus devoid of cytotoxicity. The PMLA tripeptide copolymers are useful for safe and efficient cytoplasmic delivery routed through endosome.
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Affiliation(s)
- Hui Ding
- Department of Neurosurgery, Cedars-Sinai Medical Center, 110 N. George Burns Rd, Davis 2094A, Los Angeles, CA 90048, USA.
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Abstract
INTRODUCTION Tissue defects, sustained through disease or trauma, present enormous challenges in regenerative medicine. Modern tissue engineering (TE) aims at replacing or repairing these defects through a combined approach of biodegradable scaffolds, suitable cell sources and appropriate environmental cues, such as biomolecules presented on scaffold surfaces or sustainably released from within. AREAS COVERED This review provides a brief overview of the various drugs and bioactive molecules of interest to TE, as well as a selection of materials that have been proposed for TE scaffolds and matrices in the past. It then proceeds to discuss encapsulation, immobilization and controlled release strategies for bioactive proteins, before discussing recent advances in this area with a special focus on soft TE. EXPERT OPINION Overall, minimal clinical success has been achieved so far in using growth factor, morphogen, or adhesion factor modified scaffolds and matrices; only one growth factor delivery system (Regranex Gel), has been approved by the FDA for clinical use, with only a handful of other growth factors being approved for human use so far. However, many more growth factors are currently in clinical Phase I - II or preclinical trials and many delivery systems utilize materials already approved by the FDA for other purposes. With respect to drug delivery in soft TE, a combination of increased research efforts in hydrogel and support material development as well as growth factor development is needed before clinical success is realized.
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Affiliation(s)
- Katharina Ladewig
- The University of Melbourne, Department of Chemical and Biomolecular Engineering , Parkville VIC, Australia.
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Ruthardt N, Lamb DC, Bräuchle C. Single-particle tracking as a quantitative microscopy-based approach to unravel cell entry mechanisms of viruses and pharmaceutical nanoparticles. Mol Ther 2011; 19:1199-211. [PMID: 21654634 DOI: 10.1038/mt.2011.102] [Citation(s) in RCA: 160] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Highly sensitive fluorescence microscopy techniques allow single nanoparticles to be tracked during their uptake into living cells with high temporal and spatial resolution. From analysis of the trajectories, random motion can be discriminated from active transport and the average transport velocity and/or diffusion coefficient determined. Such an analysis provides important information regarding the uptake pathway and location of viruses and nanoparticles. In this review, we give an introduction into single-particle tracking (SPT) and determination of the mean-squared displacement. We also give an overview of recent advances in SPT. These include millisecond alternating-laser excitation for removal of spectral crosstalk, alternating wide-field (WF), and total internal reflection fluorescence (TIRF) microscopy for sensitive experiments at the plasma membrane and three-dimensional tracking strategies. Throughout the review, we highlight recent advances regarding the entry (and egress) of natural and artificial viruses obtained via SPT.
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Affiliation(s)
- Nadia Ruthardt
- Department of Chemistry, Ludwig-Maximilians-Universität München, Munich, Germany
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Gillmeister MP, Betenbaugh MJ, Fishman PS. Cellular Trafficking and Photochemical Internalization of Cell Penetrating Peptide Linked Cargo Proteins: A Dual Fluorescent Labeling Study. Bioconjug Chem 2011; 22:556-66. [DOI: 10.1021/bc900445g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael P. Gillmeister
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
- Research Service, Veterans Affairs Maryland Health Care Service, Baltimore, Maryland 21201, United States
| | - Michael J. Betenbaugh
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Paul S. Fishman
- Research Service, Veterans Affairs Maryland Health Care Service, Baltimore, Maryland 21201, United States
- Department of Neurology, University of Maryland School of Medicine, Baltimore, Maryland, United States
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McMahon KM, Mutharasan RK, Tripathy S, Veliceasa D, Bobeica M, Shumaker DK, Luthi AJ, Helfand BT, Ardehali H, Mirkin CA, Volpert O, Thaxton CS. Biomimetic high density lipoprotein nanoparticles for nucleic acid delivery. NANO LETTERS 2011; 11:1208-14. [PMID: 21319839 PMCID: PMC4077779 DOI: 10.1021/nl1041947] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We report a gold nanoparticle-templated high density lipoprotein (HDL AuNP) platform for gene therapy that combines lipid-based nucleic acid transfection strategies with HDL biomimicry. For proof-of-concept, HDL AuNPs are shown to adsorb antisense cholesterylated DNA. The conjugates are internalized by human cells, can be tracked within cells using transmission electron microscopy, and regulate target gene expression. Overall, the ability to directly image the AuNP core within cells, the chemical tailorability of the HDL AuNP platform, and the potential for cell-specific targeting afforded by HDL biomimicry make this platform appealing for nucleic acid delivery.
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Affiliation(s)
- Kaylin M. McMahon
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
- Institute for BioNanotechnology and Medicine (IBNAM), 303 E. Superior Ave., 11 Floor, Chicago, IL 60611
| | - R. Kannan Mutharasan
- Feinberg Cardiovascular Research Institute, 303 E. Chicago Ave., Tarry 14-725, Chicago, IL 60611
| | - Sushant Tripathy
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
- Institute for BioNanotechnology and Medicine (IBNAM), 303 E. Superior Ave., 11 Floor, Chicago, IL 60611
| | - Dorina Veliceasa
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
| | - Mariana Bobeica
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
- Institute for BioNanotechnology and Medicine (IBNAM), 303 E. Superior Ave., 11 Floor, Chicago, IL 60611
| | - Dale K. Shumaker
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
- Robert H. Lurie Comprehensive Cancer Center, 303 E. Superior Ave., Chicago, IL 60611
| | - Andrea J. Luthi
- Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, IL 60208
- Northwestern University, International Institute for Nanotechnology, 2145 Sheridan Road, Evanston, IL 60208
| | - Brian T. Helfand
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
| | - Hossein Ardehali
- Feinberg Cardiovascular Research Institute, 303 E. Chicago Ave., Tarry 14-725, Chicago, IL 60611
| | - Chad A. Mirkin
- Robert H. Lurie Comprehensive Cancer Center, 303 E. Superior Ave., Chicago, IL 60611
- Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, IL 60208
- Northwestern University, International Institute for Nanotechnology, 2145 Sheridan Road, Evanston, IL 60208
| | - Olga Volpert
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
| | - C. Shad Thaxton
- Northwestern University, Feinberg School of Medicine, Department of Urology, 303 E. Chicago Ave., Tarry 16-703, Chicago, IL 60611
- Robert H. Lurie Comprehensive Cancer Center, 303 E. Superior Ave., Chicago, IL 60611
- Institute for BioNanotechnology and Medicine (IBNAM), 303 E. Superior Ave., 11 Floor, Chicago, IL 60611
- Northwestern University, International Institute for Nanotechnology, 2145 Sheridan Road, Evanston, IL 60208
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Park IK, Singha K, Arote RB, Choi YJ, Kim WJ, Cho CS. pH-Responsive Polymers as Gene Carriers. Macromol Rapid Commun 2010; 31:1122-33. [PMID: 21590865 DOI: 10.1002/marc.200900867] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Revised: 02/05/2010] [Indexed: 11/05/2022]
Abstract
Despite the immense potential of non-viral delivery system in gene therapy its application has been impaired greatly by various impediments having contrasting traits. Therefore it is an absolute necessity to develop some non-viral vectors which are endowed with special characteristics to act differently in intracellular as well as extracellular compartments to surmount these inter-conflicting hurdles. Such smart polymers should serve some specific purposes by adjusting their structural or functional traits under the influence of stimuli such as temperature, light, salt concentration or pH. Among all these stimuli-responsive polymers pH-responsive polymers have attracted major attention and great impetus has been directed towards utilizing the subtle yet significant change in pH value within the cellular compartments. This review is intended to provide a comprehensive account of the development of pH-responsive polymeric vectors based on their structural features and consequent functional attributes to achieve efficient transfection. The underlying modes of actions relating to structure and differential pH environment have also been discussed in this review.
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Affiliation(s)
- In-Kyu Park
- Department of Biomedical Sciences, Chonnam National University Medical School, Chonnam National University, Gwangju 501-746, Korea
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Koopmans RJ. Nanobiotechnology. Ind Biotechnol (New Rochelle N Y) 2010. [DOI: 10.1002/9783527630233.ch7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Benoit DS, Henry SM, Shubin AD, Hoffman AS, Stayton PS. pH-responsive polymeric sirna carriers sensitize multidrug resistant ovarian cancer cells to doxorubicin via knockdown of polo-like kinase 1. Mol Pharm 2010; 7:442-55. [PMID: 20073508 PMCID: PMC2920053 DOI: 10.1021/mp9002255] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Small interfering RNA (siRNA)-based therapies have great potential for the treatment of debilitating diseases such as cancer, but an effective delivery strategy for siRNA is elusive. Here, pH-responsive complexes were developed for the delivery of siRNA in order to sensitize drug-resistant ovarian cancer cells (NCI/ADR-RES) to doxorubicin. The electrostatic complexes consisted of a cationic micelle used as a nucleating core, siRNA, and a pH-responsive endosomolytic polymer. Cationic micelles were formed from diblock copolymers of dimethylaminoethyl methacrylate (pDMAEMA) and butyl methacrylate (pDbB). The hydrophobic butyl core mediated micelle formation while the positively charged pDMAEMA corona enabled siRNA condensation. To enhance cytosolic delivery through endosomal release, a pH-responsive copolymer of poly(styrene-alt-maleic anhydride) (pSMA) was electrostatically complexed with the positively charged siRNA/micelle to form a ternary complex. Complexes exhibited size (30-105 nm) and charge (slightly positive) properties important for endocytosis and were found to be noncytotoxic and mediate uptake in >70% of ovarian cancer cells after 1 h of incubation. The pH-responsive ternary complexes were used to deliver siRNA against polo-like kinase 1 (plk1), a gene upregulated in many cancers and responsible for cell cycle progression, to ovarian cancer cell lines. Treatment resulted in approximately 50% reduction of plk1 gene expression in the drug-resistant NCI/ADR-RES ovarian cancer cell model and in the drug-sensitive parental cell line, OVCAR8. This knockdown functionally sensitized NCI/ADR-RES cells to doxorubicin at levels similar to OVCAR8. Sensitization occurred through a p53 signaling pathway, as indicated by caspase 3/7 upregulation following plk1 knockdown and doxorubicin treatment, and this effect could be abrogated using a p53 inhibitor. To demonstrate the potential for dual delivery from this polymer system, micelle cores were subsequently loaded with doxorubicin and utilized in ternary complexes to achieve cell sensitization through simultaneous siRNA and drug delivery from a single carrier. These results show knockdown of plk1 results in sensitization of multidrug resistant cells to doxorubicin, and this combination of gene silencing and small molecule drug delivery may prove useful to achieve potent therapeutic effects.
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Affiliation(s)
| | | | - Andrew D. Shubin
- Department of Bioengineering, University of Washington, Seattle WA 98195
| | - Allan S. Hoffman
- Department of Bioengineering, University of Washington, Seattle WA 98195
| | - Patrick S. Stayton
- Department of Bioengineering, University of Washington, Seattle WA 98195
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Farid WO, McCallum D, Tait RJ, Dunlop SA, Hulse GK. Minor pathological changes are induced by naltrexone-poly(DL-lactide) implants in pregnant rats. J Biomed Mater Res A 2010; 91:964-74. [PMID: 19097147 DOI: 10.1002/jbm.a.32283] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Oral naltrexone is used to treat alcohol and heroin dependence but is associated with poor patient compliance. Sustained-release preparations have been developed to overcome noncompliance. Many sustained-release preparations are composed of polymers combined with naltrexone. Limited data indicate that polymers induce variable levels of tissue reactivity and that naltrexone may increase this effect. A slow-release subcutaneous naltrexone-poly (DL-lactide) implant is currently being trialed to treat heroin dependence in Western Australia. A minority of women fall pregnant and, although tissue reactivity in nonpregnant humans is relatively minor, detailed chronological data during pregnancy are lacking. Histological changes in pregnant rats were assessed; a single active tablet containing poly[trans-3,6-dimethyl-1,4-dioxyane-2,5-dione] (DL-lactide) loaded with 25 mg of naltrexone was implanted subcutaneously, and tissue response was compared with inactive polymer implantation. Rats were timed mated at 13-26 days postimplant. Tissue assessment up to 75 days by a pathologist showed that naltrexone induced chronic inflammatory response in a dose-dependent manner, although still at a low level. Furthermore, for inactive implants, minimal foreign body reaction and fibrosis, together with low-level inflammation, suggested good long-term biocompatibility. We conclude that the Australian naltrexone-poly(DL-lactide) implant is tolerated in pregnant rats, reinforcing its potential role for managing alcohol and heroin dependence in pregnant humans.
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Affiliation(s)
- W O Farid
- Experimental and Regenerative Neurosciences, School of Animal Biology (M317), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
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McCabe JF, Yan Z, Al Naimi OT, Mahmoud G, Rolland SL. Smart materials in dentistry--future prospects. Dent Mater J 2009; 28:37-43. [PMID: 19280966 DOI: 10.4012/dmj.28.37] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- John F McCabe
- School of Dental Sciences, Newcastle University, Framlington Place, Newcastle upon Tyne. NE2 4BW.
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Tiwari S, Goyal AK, Khatri K, Mishra N, Vyas SP. Gel core liposomes: An advanced carrier for improved vaccine delivery. J Microencapsul 2008; 26:75-82. [DOI: 10.1080/02652040802170897] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ganta S, Devalapally H, Shahiwala A, Amiji M. A review of stimuli-responsive nanocarriers for drug and gene delivery. J Control Release 2008; 126:187-204. [PMID: 18261822 DOI: 10.1016/j.jconrel.2007.12.017] [Citation(s) in RCA: 1533] [Impact Index Per Article: 95.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2007] [Accepted: 12/03/2007] [Indexed: 11/15/2022]
Abstract
Nanotechnology has shown tremendous promise in target-specific delivery of drugs and genes in the body. Although passive and active targeted-drug delivery has addressed a number of important issues, additional properties that can be included in nanocarrier systems to enhance the bioavailability of drugs at the disease site, and especially upon cellular internalization, are very important. A nanocarrier system incorporated with stimuli-responsive property (e.g., pH, temperature, or redox potential), for instance, would be amenable to address some of the systemic and intracellular delivery barriers. In this review, we discuss the role of stimuli-responsive nanocarrier systems for drug and gene delivery. The advancement in material science has led to design of a variety of materials, which are used for development of nanocarrier systems that can respond to biological stimuli. Temperature, pH, and hypoxia are examples of "triggers" at the diseased site that could be exploited with stimuli-responsive nanocarriers. With greater understanding of the difference between normal and pathological tissues and cells and parallel developments in material design, there is a highly promising role of stimuli-responsive nanocarriers for drug and gene delivery in the future.
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Affiliation(s)
- Srinivas Ganta
- Department of Pharmaceutical Sciences, School of Pharmacy, Northeastern University, 110 Mugar Life Sciences Building, Boston, MA 02115, United States
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Vallières K, Chevallier P, Sarra-Bournet C, Turgeon S, Laroche G. AFM imaging of immobilized fibronectin: does the surface conjugation scheme affect the protein orientation/conformation? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9745-51. [PMID: 17705411 DOI: 10.1021/la701323q] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Covalent grafting of biomolecules could potentially improve the biocompatibility of materials. However, these molecules have to be grafted in an active conformation to play their biological roles. The present work aims at verifying if the surface conjugation scheme of fibronectin (FN) affects the protein orientation/conformation and activity. FN was grafted onto plasma-treated fused silica using two different crosslinkers, glutaric anhydride (GA) or sulfosuccinimidyl 4-(p-maleimidophenyl)butyrate (SMPB). Fused silica was chosen as a model surface material because it presents a roughness well below the dimensions of FN, therefore allowing AFM analyses with appropriate depth resolution. Cell adhesion assays were performed to evaluate the bioactivity of grafted FN. Cell adhesion was found to be higher on GA-FN than on SMPB-FN. Since FN-radiolabeling assays allowed us to rule out a surface concentration effect (approximately 80 ng/cm2 of FN on both crosslinkers), it was hypothesized that FN adopted a more active conformation when grafted via GA. In this context, the FN conformation on both crosslinkers was investigated through AFM and contact angle analyses. Before FN grafting, GA- and SMPB-modified surfaces had a similar water contact angle, topography, and roughness. However, water contact angles of GA-FN and SMPB-FN surfaces clearly show differences in surface hydrophilicity, therefore indicating a dependence of protein organization toward the conjugation strategy. Furthermore, AFM results demonstrated that surface topography and roughness of both FN-conjugated surfaces were significantly different. Distribution analysis of FN height and diameter confirmed this observation as the protein dimensions were significantly larger on GA than SMPB. This study confirmed that the covalent immobilization scheme of biomolecules influences their conformation and, hence, their activity. Consequently, selecting the appropriate conjugation strategy is of paramount importance in retaining molecule bioactivity.
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Affiliation(s)
- Karine Vallières
- Unité de Biotechnologie et de Bioingénierie, Centre de recherche du CHUQ, Hôpital Saint-François d'Assise, 10 rue de l'Espinay, Qué., Canada G1L 3L5
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Kaigler D, Cirelli JA, Giannobile WV. Growth factor delivery for oral and periodontal tissue engineering. Expert Opin Drug Deliv 2006; 3:647-62. [PMID: 16948560 PMCID: PMC2573469 DOI: 10.1517/17425247.3.5.647] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The treatment of oral and periodontal diseases and associated anomalies accounts for a significant proportion of the healthcare burden, with the manifestations of these conditions being functionally and psychologically debilitating. Growth factors are critical to the development, maturation, maintenance and repair of craniofacial tissues, as they establish an extracellular environment that is conducive to cell and tissue growth. Tissue-engineering principles aim to exploit these properties in the development of biomimetic materials that can provide an appropriate microenvironment for tissue development. These materials have been constructed into devices that can be used as vehicles for delivery of cells, growth factors and DNA. In this review, different mechanisms of drug delivery are addressed in the context of novel approaches to reconstruct and engineer oral- and tooth-supporting structures, namely the periodontium and alveolar bone.
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Affiliation(s)
- Darnell Kaigler
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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Zhang Z, Cao X, Zhao X, Withers SB, Holt CM, Lewis AL, Lu JR. Controlled delivery of antisense oligodeoxynucleotide from cationically modified phosphorylcholine polymer films. Biomacromolecules 2006; 7:784-91. [PMID: 16529415 DOI: 10.1021/bm050840b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Antisense strategy is a promising approach for the prevention of in-stent restenosis if therapeutic agents such as antisense oligodeoxynucleotides (AS-ODNs) can be successfully delivered to the implant site. Optimizing the routes and conditions for controlled loading and release of therapeutic agents from a biocompatible polymer coating is still required. In this study, phosphorylcholine (PC) polymer films bearing different cationic charge densities were deposited onto smooth silicon substrates. The thickness of these films was determined by spectroscopic ellipsometry (SE). Human c-myc AS-ODNs were incorporated into the PC polymer films by immersion in concentrated AS-ODN solution and eluted into PBS under physiological conditions. The elution profile was monitored by UV spectrometry and gel electrophoresis. Cellular uptake of the eluted AS-ODN into vascular smooth muscle cells (VSMCs) was evaluated by fluorescence microscopy. The results showed that ODN loading capacities increased with film thickness and were also strongly dependent on the cationic charge density. AS-ODN release was characterized by a slight initial burst in the first half hour followed by a period of sustained release up to 8 days. Gel electrophoresis demonstrated DNA integrity, and different transfection efficiencies were observed when the eluted ODNs were transfected into VSMCs. These results demonstrated that cationically modified PC polymers are capable of delivery of antisense ODNs in a controlled manner and that they are well suited for specific biomedical devices such as DNA-eluting stents.
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Affiliation(s)
- ZhuoQi Zhang
- Biological Physics Group, School of Physics and Astronomy, The University of Manchester, Sackville Street Building, Sackville Street, Manchester M60 1QD, UK
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