1
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Sheikhi M, Nemayandeh N, Shirangi M. Peptide Acylation in Aliphatic Polyesters: a Review of Mechanisms and Inhibition Strategies. Pharm Res 2024; 41:765-778. [PMID: 38504074 DOI: 10.1007/s11095-024-03682-6] [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: 10/10/2023] [Accepted: 02/24/2024] [Indexed: 03/21/2024]
Abstract
Biodegradable polyesters are widely employed in the development of controlled release systems for peptide drugs. However, one of the challenges in developing a polyester-based delivery system for peptides is the acylation reaction between peptides and polymers. Peptide acylation is an important factor that affects formulation stability and can occur during storage, in vitro release, and after drug administration. This review focuses on the mechanisms and parameters that influence the rate of peptide acylation within polyesters. Furthermore, it discusses reported strategies to minimize the acylation reaction.
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Affiliation(s)
- Mojgan Sheikhi
- Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Science Tehran, Tehran, Iran
| | - Nasrin Nemayandeh
- Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Science Tehran, Tehran, Iran
| | - Mehrnoosh Shirangi
- Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Science Tehran, Tehran, Iran.
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2
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Lee S, Hong HK, Song JS, Jeong SI, Chung JY, Woo SJ, Park KD. Intravitreal injectable hydrogel rods with long-acting bevacizumab delivery to the retina. Acta Biomater 2023; 171:273-288. [PMID: 37739248 DOI: 10.1016/j.actbio.2023.09.025] [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: 05/19/2023] [Revised: 09/08/2023] [Accepted: 09/15/2023] [Indexed: 09/24/2023]
Abstract
Retinal vascular diseases such as neovascular age-related macular degeneration (nAMD) are the leading cause of blindness worldwide. They can be treated with intravitreal injections of anti-vascular endothelial growth factor (anti-VEGF) agents by inhibiting VEGF which is a major agent of abnormal blood vessel growth. However, because of drug's short half-life, clinical treatment often requires monthly repeated intravitreal injections, causing treatment burden and undertreatment. Among various kinds of drug carriers, in situ forming hydrogels have been studied as potential intravitreal drug carriers for the high drug loading, easy injection, controlled drug release, and protection of encapsulated drugs from the environment. However, gelation time, crosslinking degree, and drug release patterns following injection of a liquid that will be subsequently gelled in situ are susceptible to be hindered by dilution of the hydrogel precursor solution with body fluids (e.g., blood or vitreous). Here, we report an injectable pre-crosslinked hydrogel rod to overcome the limitations of in situ forming hydrogels and to extend intravitreal half-life of anti-VEGF for reducing intraocular injection frequency. Hydrogel rods can be simply prepared using in situ forming hydrogels, and injectable using a designed rod injector. The adjustable crosslinking degree of hydrogel rods easily controlled bevacizumab release profiles in a sustained manner. Compared with in situ forming hydrogels, hydrogel rods effectively reduced initial burst release, and showed sustained release with long-term drug efficacy in vitro. From the 4-month in vivo pharmacokinetic analysis, following the intravitreal injection of hydrogel rods, the half-life of bevacizumab in the vitreous and retina was significantly extended, and drug elimination to aqueous humor was effectively reduced. Finally, intraocular stability, degradation, and inflammatory response of hydrogel rods were evaluated. We expect that the hydrogel rod can be a potential drug delivery system for the treatment of nAMD and other conditions that need long-term and local sustained drug administration. STATEMENT OF SIGNIFICANCE: Herein, we report an injectable pre-crosslinked hydrogel rod based on an in situ forming hydrogel to achieve intravitreal long-acting anti-VEGF delivery to reduce injection frequency and improve the long-term visual outcomes of patients with retinal vascular diseases. Hydrogel rods were readily prepared using removable molds and injected using customized injectors. Compared to the in situ forming hydrogel, hydrogel rods showed significantly reduced initial burst release, controllable release profiles for several months, physical stability, and a long-acting anti-angiogenic effect. Animal studies demonstrated that the hydrogel rods dramatically prolonged the intraocular drug half-life while significantly reducing drug elimination for up to four months. Moreover, the biodegradability and safety of the hydrogel rods suggest their suitability as an advanced intravitreal DDS for treating retinal vascular diseases.
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Affiliation(s)
- Simin Lee
- Department of Molecular Science and Technology, Ajou University, Suwon, Republic of Korea
| | - Hye Kyoung Hong
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jae Shin Song
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea; Department of Ophthalmology, Armed Forces Capital Hospital, Seongnam, Republic of Korea
| | - Sae Im Jeong
- Department of Clinical Pharmacology and Therapeutics, Chungbuk National University Hospital, Cheongju-si, Republic of Korea
| | - Jae Yong Chung
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, and Bundang Hospital, Seongnam, Republic of Korea
| | - Se Joon Woo
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
| | - Ki Dong Park
- Department of Molecular Science and Technology, Ajou University, Suwon, Republic of Korea.
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3
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Omidi M, Mansouri V, Mohammadi Amirabad L, Tayebi L. Impact of Lipid/Magnesium Hydroxide Hybrid Nanoparticles on the Stability of Vascular Endothelial Growth Factor-Loaded PLGA Microspheres. ACS APPLIED MATERIALS & INTERFACES 2021; 13:24370-24384. [PMID: 34006111 PMCID: PMC9328745 DOI: 10.1021/acsami.0c22140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The purpose of the present study is to characterize poly(d,l-lactide-co-glycolide) (PLGA) composite microcarriers for vascular endothelial growth factor (VEGF) delivery. To reduce the initial burst release and protect the bioactivity, VEGF is encapsulated in soybean l-α-phosphatidylethanolamine (PE) and l-α-phosphatidylcholine (PC) anhydrous reverse micelle (VEGF-RM) nanoparticles. Also, mesoporous nano-hexagonal Mg(OH)2 nanostructure (MNS)-loaded PE/PC anhydrous reverse micelle (MNS-RM) nanoparticles are synthesized to suppress the induced inflammation of PLGA acidic byproducts and regulate the release profile. The flow-focusing microfluidic geometry platforms are used to fabricate different combinations of PLGA composite microspheres (PLGA-CMPs) with MNSs, MNS-RM, VEGF-RM, and native VEGF. The essential parameters of each formulation, such as release profiles, encapsulation efficacy, bioactivity, inflammatory response, and cytotoxicity, are investigated by in vitro and in vivo studies. The results indicate that generated acidic byproducts during the hydrolytic degradation process of PLGA can be buffered, and pH values inside and outside microspheres can remain steady during degradation by MNSs. Furthermore, the significant improvement in the stability of the encapsulated VEGF is confirmed by the bioactivity assay. In vitro release study shows that the VEGF initial burst release is well minimized in the present microcarriers. The present monodisperse PLGA-CMPs can be widely used in various tissue engineering and therapeutic applications.
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Affiliation(s)
- Meisam Omidi
- Marquette University School of Dentistry, Milwaukee, Wisconsin 53201-1881, United States
- Protein Research Center, Shahid Beheshti University G.C., Tehran 19839-69411, Iran
| | - Vahid Mansouri
- Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical sciences, Tehran 19857-17443, Iran
- Department of Basic Science, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran 19857-17443, Iran
| | | | - Lobat Tayebi
- Marquette University School of Dentistry, Milwaukee, Wisconsin 53201-1881, United States
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4
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Tuning morphology of Pickering emulsions stabilised by biodegradable PLGA nanoparticles: How PLGA characteristics influence emulsion properties. J Colloid Interface Sci 2021; 595:202-211. [PMID: 33823323 DOI: 10.1016/j.jcis.2021.03.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 03/05/2021] [Accepted: 03/11/2021] [Indexed: 11/20/2022]
Abstract
In this study, we proved that the stabilisation of Pickering emulsions by polymer nanoparticles (NPs) heavily depends on polymer characteristics. We prepared NPs with four poly(lactide-co-glycolide) polymers (PLGA), of different molar masses (14,000 and 32,000 g/mol) and end groups (acid or alkylester). NPs were either bare (without stabilising polymer) or covered by polyvinyl alcohol (PVA). Pickering emulsions were prepared by mixing NP aqueous suspensions with various amounts of oil (Miglyol 812 N). First, NP wettability was directly affected by PLGA end group: ester-ending PLGA led to more hydrophobic NPs, compared to acid-ending PLGA. This effect of the end group could be slightly enhanced with smaller molar mass. Thus, bare PLGA NPs stabilised different types of emulsions (W/O/W and W/O), following Finkle's rule. However, the effect of PLGA characteristics was masked when NPs were covered by PVA, as PVA drove the stabilisation of O/W emulsions. Secondly, PLGA molar mass and end group also influenced its glass transition temperature (Tg), with spectacular consequences on emulsion formation. Indeed, the shortest ester-ending PLGA exhibited a Tg close to room temperature, when measured in the emulsion. This Tg, easily exceeded during emulsification process, led to a soft solid emulsion, stabilised by a network of NP debris.
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5
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Omidi M, Almeida L, Tayebi L. Microfluidic-assisted fabrication of reverse micelle/PLGA hybrid microspheres for sustained vascular endothelial growth factor delivery. Biotechnol Appl Biochem 2020; 68:616-625. [PMID: 32533571 DOI: 10.1002/bab.1971] [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] [Received: 01/05/2020] [Accepted: 06/06/2020] [Indexed: 12/17/2022]
Abstract
In this study, poly (d, l-lactide-co-glycolide) (PLGA) composite microspheres containing anhydrous reverse micelle (R.M.) dipalmitoylphosphatidylcholine (DPPC) nanoparticles loaded vascular endothelial growth factor (VEGF) were produced using microfluidic platforms. The VEGF-loaded R.M. nanoparticles (VRM) were achieved by initial self-assembly and subsequent lipid inversion of the DPPC vesicles. The fabricated VRMs were encapsulated into the PLGA matrix by flow-focusing geometry microfluidic platforms. The encapsulation efficiency, in vitro release profile, and the bioactivity of the produced composite microspheres were investigated. The release study showed that VEGF was slowly released from the PLGA composite microspheres over 28 days with a reduced initial burst (18 ± 4.17% in the first 24 H). The VEGF stability during encapsulation and release period was also investigated, and the results indicated that encapsulated VEGF was well preserved. Also, the bioactivity assay of the PLGA composite microspheres on human umbilical vein endothelial cells was confirmed that the encapsulated VEGF was utterly active. The present monodisperse and controllable VEGF-loaded microspheres with reproducible manner could be widely used in tissue engineering and therapeutic applications.
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Affiliation(s)
- Meisam Omidi
- Marquette University School of Dentistry, Milwaukee, WI, USA
| | - Luis Almeida
- Marquette University School of Dentistry, Milwaukee, WI, USA
| | - Lobat Tayebi
- Marquette University School of Dentistry, Milwaukee, WI, USA
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6
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Molavi F, Barzegar-Jalali M, Hamishehkar H. Polyester based polymeric nano and microparticles for pharmaceutical purposes: A review on formulation approaches. J Control Release 2020; 320:265-282. [DOI: 10.1016/j.jconrel.2020.01.028] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 01/15/2020] [Accepted: 01/17/2020] [Indexed: 12/18/2022]
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7
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Wang J, Li S, Chen T, Xian W, Zhang H, Wu L, Zhu W, Zeng Q. Nanoscale cationic micelles of amphiphilic copolymers based on star-shaped PLGA and PEI cross-linked PEG for protein delivery application. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2019; 30:93. [PMID: 31392433 DOI: 10.1007/s10856-019-6294-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Accepted: 07/26/2019] [Indexed: 06/10/2023]
Abstract
To enhance the bioavailability of protein therapeutants and improve the stability of storage and delivery, a series of branched amphiphilic block copolymers consisting of cholic acid (CA) initiated poly(D,L-lactide-co-glycolide) (CA-PLGA) and water-soluble polyethyleneimine cross-linked polyethylene glycol (PEI-PEG) denoted as CA-PLGA-b-(PEI-PEG) were synthesized and characterized. CA-PLGA-b-(PEI-PEG) presented low cytotoxicity by MTT and cck-8 assay. The cationic CA-PLGA-b-(PEI-PEG) micelles (diameter about 100 nm and zeta potential 34-61 mV) were prepared through self-assembly method, and complexed with insulin via electrostatic interaction to obtain nanoscale micelle/insulin complexes. The micelle/insulin complexes-loaded CA-PLGA microspheres (MIC-MS, 10.4 ± 3.85 μm) were manufactured by employing a double emulsion (W1/O/W2) method. The in vitro insulin release behavior and in vivo hypoglycaemic effect of MIC-MS on streptozotocin (STZ) induced diabetic rats were compared with those of the insulin-loaded CA-PLGA microspheres (INS-MS, 7.8 ± 2.57 μm). The initial burst in vitro release of MIC-MS was markedly lower than that of INS-MS (P < 0.01), and the pharmacological availability of MIC-MS via subcutaneous administration was 148.9% relative to INS-MS. Therefore, the cationic CA-PLGA-b-(PEI-PEG) micelles can effectively increase the bioavailability of insulin in CA-PLGA microspheres and can be considered as a potential protein carrier.
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Affiliation(s)
- Jun Wang
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Shunying Li
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Tingting Chen
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wenjiao Xian
- Department of Histology and Embryology, School of Basic Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Huiwu Zhang
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Cancer Therapeutics & Drug Discovery Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Lei Wu
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wenting Zhu
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Qingbing Zeng
- Biomaterials Research Center, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China.
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China.
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8
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Abstract
Absorbable suture suspension is one of the newest minimally invasive treatment trends for lifting and repositioning ptotic facial tissue. The Silhouette Instalift is a convenient in-office procedure that provides a unique and advanced clinical treatment for a natural looking midfacial lift. Research has shown that most patients characterized the Silhouette Instalift as immediately effective and were pleased by enhancements. The procedure has an improved safety and efficacy profile over the predecessor, barbed suture thread lifting, coupled with reduced risk of complications and recovery time compared with rhytidectomy. Absorbable suture suspension should be considered a workhorse in nonsurgical esthetic treatments.
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9
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He S, Fu W, Zou M, Xing W, Liu Z, Xu D. Construction and evaluation of SAK-HV protein oral dosage form based on chitosan quaternary ammonium salt-PLGA microsphere. J Drug Target 2019; 27:1108-1117. [DOI: 10.1080/1061186x.2019.1605520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Shiming He
- Institute of Military Cognition and Brain Sciences, Beijing, China
- College of Pharmaceutical Sciences, Hebei University, Baoding, China
| | - Wenliang Fu
- Institute of Military Cognition and Brain Sciences, Beijing, China
| | - Minji Zou
- Institute of Military Cognition and Brain Sciences, Beijing, China
| | - Weiwei Xing
- Institute of Military Cognition and Brain Sciences, Beijing, China
| | - Zhongcheng Liu
- College of Pharmaceutical Sciences, Hebei University, Baoding, China
| | - Donggang Xu
- Institute of Military Cognition and Brain Sciences, Beijing, China
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10
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Omidi M, Hashemi M, Tayebi L. Microfluidic synthesis of PLGA/carbon quantum dot microspheres for vascular endothelial growth factor delivery. RSC Adv 2019; 9:33246-33256. [PMID: 35529135 PMCID: PMC9073357 DOI: 10.1039/c9ra06279c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 10/08/2019] [Indexed: 11/21/2022] Open
Abstract
In this study, vascular endothelial growth factor (VEGF) loaded poly(d,l-lactide-co-glycolide) (PLGA) – carbon quantum dot microspheres were produced using microfluidic platforms.
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Affiliation(s)
- Meisam Omidi
- Marquette University School of Dentistry
- Milwaukee
- USA
| | - Mohadeseh Hashemi
- Department of Biomedical Engineering
- The University of Texas at Austin
- Austin
- USA
- Division of Pharmaceutics
| | - Lobat Tayebi
- Marquette University School of Dentistry
- Milwaukee
- USA
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11
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Hassanzadeh P, Atyabi F, Dinarvand R. Tissue engineering: Still facing a long way ahead. J Control Release 2018; 279:181-197. [DOI: 10.1016/j.jconrel.2018.04.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 04/09/2018] [Accepted: 04/11/2018] [Indexed: 02/07/2023]
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12
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Abdelkader DH, Osman MA, El-Gizawy SA, Hawthorne SJ, Faheem AM, McCarron PA. Effect of poly(ethylene glycol) on insulin stability and cutaneous cell proliferation in vitro following cytoplasmic delivery of insulin-loaded nanoparticulate carriers – A potential topical wound management approach. Eur J Pharm Sci 2018; 114:372-384. [DOI: 10.1016/j.ejps.2017.12.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 12/19/2017] [Accepted: 12/21/2017] [Indexed: 12/14/2022]
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13
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In vivo and in vitro sustained release of ranibizumab from a nanoporous thin-film device. Drug Deliv Transl Res 2017; 6:771-780. [PMID: 27178165 DOI: 10.1007/s13346-016-0298-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Current administration of ranibizumab and other therapeutic macromolecules to the vitreous and retina carries ocular risks, a high patient treatment burden, and compliance barriers that can lead to suboptimal treatment. Here we introduce a device that produces sustained release of ranibizumab in the vitreous cavity over the course of several months. Composed of twin nanoporous polymer thin films surrounding a ranibizumab reservoir, these devices provide release of ranibizumab over 16 weeks in vitro and 12 weeks in vivo, without exhausting the initial drug payload. Following implantation in vivo, devices were well-tolerated and showed no sign of immune response. This platform presents a potential solution to the challenge of delivering protein therapeutics to the vitreous and retina for sustained periods of time.
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14
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Zhuang J, Fang RH, Zhang L. Preparation of particulate polymeric therapeutics for medical applications. SMALL METHODS 2017; 1:1700147. [PMID: 30310860 PMCID: PMC6176868 DOI: 10.1002/smtd.201700147] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Particulate therapeutics fabricated from polymeric materials have become increasingly popular over the past several decades. Generally, polymeric systems are easy to synthesize and have tunable parameters, giving them significant potential for wide use in the clinic. They come in many different forms, including as nanoparticles, microparticles, and colloidal gels. In this review, we discuss the current preparation methods for each type of platform, as well as some representative applications. To achieve enhanced performance, lipid coatings and other surface modification techniques for introducing additional functionality are also mentioned. We hope that, by outlining the various methods and techniques for their preparation, it will be possible to provide insights into the utility of these polymeric platforms and further encourage their development for biomedical applications.
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Affiliation(s)
- Jia Zhuang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, U.S.A
| | - Ronnie H Fang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, U.S.A
| | - Liangfang Zhang
- Department of NanoEngineering and Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, U.S.A
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15
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Li Y, Chu Z, Li X, Ding X, Guo M, Zhao H, Yao J, Wang L, Cai Q, Fan Y. The effect of mechanical loads on the degradation of aliphatic biodegradable polyesters. Regen Biomater 2017; 4:179-190. [PMID: 28596915 PMCID: PMC5458542 DOI: 10.1093/rb/rbx009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/01/2017] [Accepted: 03/06/2017] [Indexed: 12/11/2022] Open
Abstract
Aliphatic biodegradable polyesters have been the most widely used synthetic polymers for developing biodegradable devices as alternatives for the currently used permanent medical devices. The performances during biodegradation process play crucial roles for final realization of their functions. Because physiological and biochemical environment in vivo significantly affects biodegradation process, large numbers of studies on effects of mechanical loads on the degradation of aliphatic biodegradable polyesters have been launched during last decades. In this review article, we discussed the mechanism of biodegradation and several different mechanical loads that have been reported to affect the biodegradation process. Other physiological and biochemical factors related to mechanical loads were also discussed. The mechanical load could change the conformational strain energy and morphology to weaken the stability of the polymer. Besides, the load and pattern could accelerate the loss of intrinsic mechanical properties of polymers. This indicated that investigations into effects of mechanical loads on the degradation should be indispensable. More combination condition of mechanical loads and multiple factors should be considered in order to keep the degradation rate controllable and evaluate the degradation process in vivo accurately. Only then can the degradable devise achieve the desired effects and further expand the special applications of aliphatic biodegradable polyesters.
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Affiliation(s)
- Ying Li
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Zhaowei Chu
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Xiaoming Li
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Xili Ding
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Meng Guo
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Haoran Zhao
- Department of Biomedical Engineer, University of Cincinnati, Cincinnati, OH 45221, USA
| | - Jie Yao
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Lizhen Wang
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
| | - Qiang Cai
- Key Laboratory of Advanced Materials of Ministry of Education of China, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Yubo Fan
- School of Biological Science and Medical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing 100191, People’s Republic of China
- National Research Center for Rehabilitation Technical Aids, Beijing 100176, People’s Republic of China
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16
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Chu Z, Li X, Li Y, Zheng Q, Feng C, Guo M, Ding X, Feng W, Gao Y, Yao J, Chen X, Wang L, Fan Y. Effects of different fluid shear stress patterns on the in vitro degradation of poly(lactide-co-glycolide) acid membranes. J Biomed Mater Res A 2016; 105:23-30. [PMID: 27507409 DOI: 10.1002/jbm.a.35860] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 07/26/2016] [Accepted: 08/05/2016] [Indexed: 01/30/2023]
Abstract
The applications of poly (lactide-co-glycolide) acid (PLGA) for coating or fabricating polymeric biodegradable stents (BDSs) have drawn more attention. The fluid shear stress has been proved to affect the in vitro degradation process of PLGA membranes. During the maintenance, BDSs could be suffered different patterns of fluid shear stress, but the effect of these different patterns on the whole degradation process is unclear. In this study, in vitro degradation of PLGA membranes was examined with steady, sinusoid, and squarewave fluid shear stress patterns in 150 mL deionized water at 37°C for 20 days, emphasizing on the changes in the viscosity of the degradation solution, mechanical, and morphological properties of the samples. The unsteady fluid shear stress with the same average magnitude as the steady one accelerate the in vitro degradation process of PLGA membranes in terms of maximum fluid shear stress and "window" of effectiveness. Maximum fluid shear stress accelerates the in vitro degradation of molecular fragments that diffused out in the solution while the "window" of effectiveness affects too in the early stage. Besides, maximum fluid shear stress and "window" of effectiveness accelerates the in vitro loss of tensile modulus and ultimate strength of the PLGA membranes while the maximum fluid shear stress plays the leading role in the decrease of tensile modulus at the early degradation stage. This study could help advance the degradation design of PLGA membranes under different fluid shear stress patterns for biomedical applications like stents and drug release systems. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 23-30, 2017.
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Affiliation(s)
- Zhaowei Chu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Ying Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Quan Zheng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Chenglong Feng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Meng Guo
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xili Ding
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wentao Feng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuanming Gao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jie Yao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xiaofang Chen
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Beijing, China.,Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,National Research Center for Rehabilitation Technical Aids, Beijing, China
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17
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Chu Z, Zheng Q, Guo M, Yao J, Xu P, Feng W, Hou Y, Zhou G, Wang L, Li X, Fan Y. The effect of fluid shear stress on thein vitrodegradation of poly(lactide-co-glycolide) acid membranes. J Biomed Mater Res A 2016; 104:2315-24. [DOI: 10.1002/jbm.a.35766] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Zhaowei Chu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Quan Zheng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Meng Guo
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Jie Yao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Peng Xu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Wentao Feng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Yongzhao Hou
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Gang Zhou
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, Key Laboratory for Optimal Design and Evaluation Technology of Implantable & Interventional Medical Devices, School of Biological Science and Medical Engineering; Beihang University; Beijing People's Republic of China
- National Research Center for Rehabilitation Technical Aids; Beijing People's Republic of China
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18
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Swed A, Cordonnier T, Dénarnaud A, Boyer C, Guicheux J, Weiss P, Boury F. Sustained release of TGF-β1 from biodegradable microparticles prepared by a new green process in CO2 medium. Int J Pharm 2015. [DOI: 10.1016/j.ijpharm.2015.07.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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19
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Ren CD, Gao S, Kurisawa M, Ying JY. Cartilage synthesis in hyaluronic acid-tyramine constructs. J Mater Chem B 2015; 3:1942-1956. [PMID: 32262266 DOI: 10.1039/c4tb01229a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The objective of this study was to determine the potential for cartilage production within a hyaluronic acid-tyramine (HA-Tyr) hydrogel scaffold. Chondrocytes were encapsulated within HA-Tyr hydrogels and subcutaneously implanted in mice. The HA-Tyr hydrogels were formed by the oxidative coupling of Tyr moieties catalyzed by hydrogen peroxide (H2O2) and horseradish peroxidase (HRP). Harvested constructs were shown to achieve a glycosaminoglycan (GAG) content of 1.2 wt%, and they demonstrated 40% of the collagen content of normal articular cartilage, including the presence of Type II collagen, which is the characteristic of articular cartilage. Matrix production was found to be influenced by the initial cell density, scaffold degradation rate and Type II collagen concentration. Injectability was also imparted to the system by delivering HRP through thermoresponsive liposomes. The method of HRP delivery, either by simple addition or through thermoresponsive liposomes, was not shown to have an effect on matrix production.
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Affiliation(s)
- Cindy D Ren
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669.
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20
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Abstract
When formulated as liquid dosage forms, therapeutic proteins and peptides often show instability during handling as a result of chemical degradation. Solid formulations are frequently required to maintain protein stability during storage, transport and upon administration. Herein we highlight current strategies used to formulate pharmaceutical proteins in the solid form. An overview of the physical instabilities which can arise with proteins is first described. The key solidification techniques of crystallization, freeze-drying and particle forming technologies are then discussed. Examples of current commercial products that are formulated in the solid state are provided and include neutral protamine Hagedorn – insulin crystal suspensions, freeze-dried monoclonal antibodies and leuproride polylactide-co-glycolide microparticles. Finally, future perspectives in solid-state protein formulation are described.
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21
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Jiang H, Wang L, Zhu K. Coaxial electrospinning for encapsulation and controlled release of fragile water-soluble bioactive agents. J Control Release 2014; 193:296-303. [DOI: 10.1016/j.jconrel.2014.04.025] [Citation(s) in RCA: 183] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 04/02/2014] [Accepted: 04/10/2014] [Indexed: 01/11/2023]
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22
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Kim YC, Chiang B, Wu X, Prausnitz MR. Ocular delivery of macromolecules. J Control Release 2014; 190:172-81. [PMID: 24998941 PMCID: PMC4142116 DOI: 10.1016/j.jconrel.2014.06.043] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Accepted: 06/23/2014] [Indexed: 12/22/2022]
Abstract
Biopharmaceuticals are making increasing impact on medicine, including treatment of indications in the eye. Macromolecular drugs are typically given by physician-administered invasive delivery methods, because non-invasive ocular delivery methods, such as eye drops, and systemic delivery, have low bioavailability and/or poor ocular targeting. There is a need to improve delivery of biopharmaceuticals to enable less-invasive delivery routes, less-frequent dosing through controlled-release drug delivery and improved drug targeting within the eye to increase efficacy and reduce side effects. This review discusses the barriers to drug delivery via various ophthalmic routes of administration in the context of macromolecule delivery and discusses efforts to develop controlled-release systems for delivery of biopharmaceuticals to the eye. The growing number of macromolecular therapies in the eye needs improved drug delivery methods that increase drug efficacy, safety and patient compliance.
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Affiliation(s)
- Yoo Chun Kim
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Bryce Chiang
- Wallace Coulter Department of Biomedical Engineering at Georgia Tech and Emory University, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Xianggen Wu
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao 266071, China
| | - Mark R Prausnitz
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; Wallace Coulter Department of Biomedical Engineering at Georgia Tech and Emory University, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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23
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Gao X, Zhou P, Yang R, Yang D, Zhang N. Protein-loaded comb-shape copolymer-based pH-responsive nanoparticles to improve the stability of proteins. J Mater Chem B 2013; 1:4992-5002. [DOI: 10.1039/c3tb20500b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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24
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Gao GH, Park MJ, Li Y, Im GH, Kim JH, Kim HN, Lee JW, Jeon P, Bang OY, Lee JH, Lee DS. The use of pH-sensitive positively charged polymeric micelles for protein delivery. Biomaterials 2012; 33:9157-64. [DOI: 10.1016/j.biomaterials.2012.09.016] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 09/10/2012] [Indexed: 01/19/2023]
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25
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Multi-arm histidine copolymer for controlled release of insulin from poly(lactide-co-glycolide) microsphere. Biomaterials 2012; 33:8848-57. [DOI: 10.1016/j.biomaterials.2012.08.042] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 08/17/2012] [Indexed: 11/23/2022]
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26
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Christian DA, Hunter CA. Particle-mediated delivery of cytokines for immunotherapy. Immunotherapy 2012; 4:425-41. [PMID: 22512636 DOI: 10.2217/imt.12.26] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The ability of cytokines to direct the immune response to vaccination, infection and tumors has motivated their use in therapy to augment or shape immunity. To avoid toxic side effects associated with systemic cytokine administration, several approaches have been developed using particle-encapsulated cytokines to deliver this cargo to specific cell types and tissues. Initial work used cytokine-loaded particles to deliver proinflammatory cytokines to phagocytes to enhance antimicrobial and antitumor responses. These particles have also been used to create a cytokine depot at a local site to supplement prophylactic or antitumor vaccines or injected directly into solid tumors to activate immune cells to eliminate established tumors. Finally, recent advances have revealed that paracrine delivery of cytokines directly to T cells has the potential to enhance T-cell mediated therapies. The studies reviewed here highlight the progress in the last 30 years that has established the potential of particle-mediated cytokine immunotherapy.
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Affiliation(s)
- David A Christian
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
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27
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Influence of secondary preparative parameters and aging effects on PLGA particle size distribution: a sedimentation field flow fractionation investigation. Anal Bioanal Chem 2012; 405:703-11. [DOI: 10.1007/s00216-012-6113-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 05/03/2012] [Accepted: 05/14/2012] [Indexed: 12/22/2022]
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28
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Singh V, Singh S, Das S, Kumar A, Self WT, Seal S. A facile synthesis of PLGA encapsulated cerium oxide nanoparticles: release kinetics and biological activity. NANOSCALE 2012; 4:2597-2605. [PMID: 22419352 DOI: 10.1039/c2nr12131j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present article a facile synthesis of cerium oxide nanoparticles (CNPs) encapsulated in PLGA microparticles is reported. The release kinetics of the CNPs from the PLGA matrix was investigated under acidic, basic and near-neutral pH. A diffusion model was applied to determine the diffusivity of the CNPs from the PLGA matrix. The morphology of the degraded PLGA particles was characterized by high resolution SEM. Superoxide dismutase (SOD) mimetic activity was retained in released CNPs for a longer period of time (∼90 days) under different pH. PLGA encapsulated CNP showed excellent biocompatibility. This study demonstrates a potential strategy to deliver CNPs using biodegradable PLGA that ensures a slow release of the CNPs over a long period of time. Thus, the synthesized PLGA encapsulated CNPs could find potential applications in tissue engineering like bone remodelling and regeneration, and protection from disorders caused by neurodegeneration.
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Affiliation(s)
- Virendra Singh
- Mechanical Materials and Aerospace Engineering, Nanoscience and Technology Center, Advanced Materials Processing and Analysis Center, University of Central Florida, USA
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29
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Nanoscaled buffering zone of charged (PLGA)n-b-bPEI micelles in acidic microclimate for potential protein delivery application. J Control Release 2012; 160:440-50. [PMID: 22405902 DOI: 10.1016/j.jconrel.2012.02.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 02/06/2012] [Accepted: 02/26/2012] [Indexed: 11/23/2022]
Abstract
Poly(lactide-co-glycolide) (PLGA) has most often been employed for the controlled release of protein formulations because of its safety profile with non-toxic degradation products. Nevertheless, such formulations have been plagued by a local acidic microenvironment and protein-polymer interactions, which result in chemical and physical denaturation of loaded proteins and often unfavorable release profiles. This study investigated the pH change of inner PLGA microsphere (MS) using charged (PLGA)(n)-b-branched polyethyleneimine (bPEI) micelles. The designed micelles can be transformed into either micelle or reverse micelle (RM) depending on the solvent and RM can form microspheres. In addition, (PLGA)(n)-b-bPEI can be modified into (PLGA)(n)-b-(carboxylated bPEI) via carboxylation of the primary amines. Cationic micelle (CM) or anionic micelle (AM) was complexed with counter-charged proteins leading to nanosized particles (approximately 100nm). In the micelle/protein complexes, the micelles mostly maintained their proton buffering capacity, and consequently, prevented or delayed the typical decrease in pH caused by degradation of PLGA in aqueous solution. Reconstitutable micelle/protein complexes allowed for increased and fine-tuned protein loading (~20wt.% when using CM1 (CM prepared from PLGA(36kDa)-b-bPEI(25kDa))/insulin complexes) in PLGA MS. In CM2 (CM prepared from (PLGA(36kDa))(2)-b-bPEI(25kDa))/insulin (4 of weight ratio (WR) of micelle to protein; WR4)-loaded PLGA MS, CM2 strongly prevented the micellar nanoenvironmental pH (pH 6.6 within 5days and then approximately pH 8.5) to be acidified in PLGA MS for 9weeks, unlike CM2-free PLGA MS. In conclusion, our findings propose that the proton buffering capacity and protein loading in PLGA MS can be tuned by controlling the complexation ratios of micelles and proteins, polymeric architectures of (PLGA)(n)-b-bPEI copolymers and WR of micelle/protein complexes and PLGA (or RM).
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30
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Zhang J, Wu L, Meng F, Wang Z, Deng C, Liu H, Zhong Z. pH and reduction dual-bioresponsive polymersomes for efficient intracellular protein delivery. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2056-2065. [PMID: 22188099 DOI: 10.1021/la203843m] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
pH and reduction dual-bioresponsive nanosized polymersomes based on poly(ethylene glycol)-SS-poly(2-(diethyl amino)ethyl methacrylate) (PEG-SS-PDEA) diblock copolymers were developed for efficient encapsulation and triggered intracellular release of proteins. PEG-SS-PDEA copolymers with PDEA-block molecular weights ranging from 4.7, 6.8, to 9.2 kg/mol were synthesized in a controlled manner via reversible addition-fragmentation chain transfer (RAFT) polymerization of 2-(diethyl amino)ethyl methacrylate (DEAEMA) using PEG-SS-CPADN (CPADN = 4-cyanopentanoic acid dithionaphthalenoate; M(n) PEG = 1.9 kg/mol) as a macro-RAFT agent. These copolymers existed as unimers in water at mildly acidic pH (<7.2) conditions, but readily formed monodisperse nanosized polymersomes (54.5-66.8 nm) when adjusting solution pH to 7.4. These polymersomes were highly sensitive to intracellular pH and reductive environments, which resulted in fast dissociation and aggregation of polymersomes, respectively. Notably, both fluorescein isothiocyanate (FITC)-labeled bovine serum albumin (FITC-BSA) and cytochrome C (FITC-CC) proteins could facilely be encapsulated into polymersomes with excellent protein-loading efficiencies, likely as a result of electrostatic interactions between proteins and PDEA. The in vitro release studies showed that protein release was minimal (<20% in 8 h) at pH 7.4 and 37 °C. The release of proteins was significantly enhanced at pH 6.0 due to collapse of polymersomes. Notably, the fastest protein release was observed under intracellular-mimicking reductive environments (10 mM dithiothreitol, pH 7.4). MTT assays in RAW 264.7 and MCF-7 cells indicated that PEG-SS-PDEA (9.2 k) polymersomes had low cytotoxicity up to a polymer concentration of 300 μg/mL. Confocal laser scanning microscope (CLSM) observations revealed that FITC-CC-loaded PEG-SS-PDEA (9.2 k) polymersomes efficiently delivered and released proteins into MCF-7 cells following 6 h of incubation. Importantly, flow cytometry assays showed that CC-loaded PEG-SS-PDEA (9.2 k) polymersomes induced markedly enhanced apoptosis of MCF-7 cells as compared to free CC and CC-loaded PEG-PDEA (8.9 k) polymersomes (reduction-insensitive control). These dual-bioresponsive polymersomes have appeared to be highly promising for intracellular delivery of protein drugs.
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Affiliation(s)
- Jinchao Zhang
- Biomedical Polymers Laboratory, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, PR China
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31
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Zhang XR, Zheng Y, Jin T, Chow AHL. Formulation of sustained-release microspheres of granulocyte macrophage colony stimulating factor by freezing-induced phase separation with dextran and encapsulation with blended polymers. J Microencapsul 2011; 28:743-51. [PMID: 21967463 DOI: 10.3109/02652048.2011.615950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study aimed to assess the potential merits of formulating sustained-release microspheres of recombinant human granulocyte macrophage colony stimulating factor (rhGM-CSF) via freezing-induced phase separation (FIPS) of the protein with dextran followed by encapsulation with binary mixture of poly(lactic-co-glycolic acid) (PLGA) 2A (MW∼12K) and 3A (MW∼47K) or of PLGA2A and polylactic acid (PLA; MW∼83K). The formulated dextran particles and microspheres were characterized in vitro for loading, aggregation, bioactivity and release behavior of the protein where appropriate. rhGM-CSF retained about 60% of bioactivity with no significant aggregation after each formulation step. Encapsulation of protein-loaded dextran particles attained only 80% with the PLGA2A and PLGA3A blend, but 100% with the PLGA2A and PLA mixture. The former formulation exhibited a triphasic in-vitro release profile typical of PLGA microspheres while the latter revealed a much lower initial burst followed by a steady and complete release of rhGM-CSF with preserved bioactivity over a 15-day period.
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Affiliation(s)
- Xin-ran Zhang
- School of Pharmacy, The Chinese University of Hong Kong, Hong Kong, China
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32
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Baik HJ, Oh NM, Oh YT, Yoo NY, Park SY, Oh KT, Youn YS, Lee ES. 3-Diethylaminopropyl-bearing glycol chitosan as a protein drug carrier. Colloids Surf B Biointerfaces 2011; 84:585-90. [DOI: 10.1016/j.colsurfb.2011.01.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 12/14/2010] [Accepted: 01/13/2011] [Indexed: 10/18/2022]
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33
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Cheng R, Meng F, Ma S, Xu H, Liu H, Jing X, Zhong Z. Reduction and temperature dual-responsive crosslinked polymersomes for targeted intracellular protein delivery. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm13536h] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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34
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Kim MR, Lee S, Park JK, Cho KY. Golf ball-shaped PLGA microparticles with internal pores fabricated by simple O/W emulsion. Chem Commun (Camb) 2010; 46:7433-5. [PMID: 20820511 DOI: 10.1039/c0cc01738h] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simple oil-in-water emulsion led to structural complexity at both the surface and interior of the PLGA microsphere. A golf ball-like dimpled surface comes from the heteroaggregation of volatile nonsolvent colloid originating from the inside of the organic droplet as supported by in situ optical microscopy. The internal porous structure and encapsulation of hydrophobic agent inside the microparticle implies its potential application as a drug carrier.
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Affiliation(s)
- Mi Ri Kim
- Division of Advanced Materials Engineering and Institute for Rare Metals, Kongju National University, Cheonan, Chungnam, 331-717, Korea
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35
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Kim H, Na K. Evaluation of succinylated pullulan for long-term protein delivery in poly(lactide-co-glycolide) microspheres. Macromol Res 2010. [DOI: 10.1007/s13233-010-0814-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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36
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Hrynyk M, Martins-Green M, Barron AE, Neufeld RJ. Sustained prolonged topical delivery of bioactive human insulin for potential treatment of cutaneous wounds. Int J Pharm 2010; 398:146-54. [PMID: 20691251 DOI: 10.1016/j.ijpharm.2010.07.052] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2010] [Revised: 07/19/2010] [Accepted: 07/26/2010] [Indexed: 11/16/2022]
Abstract
Skin damaged by heat, radiation, or chemical exposure is difficult to treat and slow to heal. Indeed full restoration of the tissue is difficult to obtain. Sub-dermal insulin injection was recently shown to stimulate wound healing of the skin by accelerating wound closure, stimulating angiogenesis and inducing a regenerative process of healing. We have developed a topical delivery vehicle that is capable of releasing therapeutic levels of bioactive insulin for several weeks with the potential to stimulate and sustain healing. By encapsulating the crystalline form of insulin within poly(d,l-lactide-co-glycolide) microspheres, we succeeded in stabilizing and then releasing bioactive insulin for up to 25 days. To measure bioactivity we used Rat L6 myofibroblasts, stimulated them with this slow release insulin and determined activation of the receptors on the cell surface by quantifying AKT phosphorylation. There was only a minor and gradual decrease in AKT phosphorylation over time. To determine whether the slow release insulin could stimulate keratinocyte migration, wounding was simulated by scratching confluent cultures of human keratinocytes (HaCaT). Coverage of the scratch "wounds" was significantly faster in the presence of insulin released from microspheres than in the insulin-free control. Extended and sustained topical delivery of active insulin from a stable protein crystal-based reservoir shows promise in promoting tissue healing.
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Affiliation(s)
- Michael Hrynyk
- Department of Chemical Engineering, Queen's University, Kingston, Ontario, Canada K7L 3N6.
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Davis HE, Leach JK. Designing bioactive delivery systems for tissue regeneration. Ann Biomed Eng 2010; 39:1-13. [PMID: 20676773 PMCID: PMC3010216 DOI: 10.1007/s10439-010-0135-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 07/20/2010] [Indexed: 11/29/2022]
Abstract
The direct infusion of macromolecules into defect sites generally does not impart adequate physiological responses. Without the protection of delivery systems, inductive molecules may likely redistribute away from their desired locale and are vulnerable to degradation. In order to achieve efficacy, large doses supplied at interval time periods are necessary, often at great expense and ensuing detrimental side effects. The selection of a delivery system plays an important role in the rate of re-growth and functionality of regenerating tissue: not only do the release kinetics of inductive molecules and their consequent bioactivities need to be considered, but also how the delivery system interacts and integrates with its surrounding host environment. In the current review, we describe the means of release of macromolecules from hydrogels, polymeric microspheres, and porous scaffolds along with the selection and utilization of bioactive delivery systems in a variety of tissue-engineering strategies.
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Affiliation(s)
- Hillary E Davis
- Department of Biomedical Engineering, University of California, Davis, 451 Health Sciences Drive, 2303 Genome and Biomedical Sciences Facility, Davis, CA, 95616, USA
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Vukomanović M, Mitrić M, Skapin SD, Zagar E, Plavec J, Ignjatović N, Uskoković D. Influence of ultrasonic processing on the macromolecular properties of poly (D,L-lactide-co-glycolide) alone and in its biocomposite with hydroxyapatite. ULTRASONICS SONOCHEMISTRY 2010; 17:902-908. [PMID: 20163978 DOI: 10.1016/j.ultsonch.2010.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 01/19/2010] [Accepted: 01/19/2010] [Indexed: 05/28/2023]
Abstract
In this work poly(D,L-lactide-co-glycolide) (PLGA) and a poly(d,l-lactide-co-glycolide)/hydroxyapatite (PLGA/HAp) composite processed in an ultrasonic field at higher (25 degrees C) and lower (8 degrees C) temperatures were studied with respect to the molecular properties of the obtained materials. The processing of the PLGA and the PLGA/HAp composite in an ultrasonic field resulted in a change of molar mass averages of the polymer/polymeric part of these materials, while an amorphous structure and a 50:50 lactide-to-glycolide co-monomer ratio were preserved without the formation of crystalline oligomers. However, mobility of polymeric chains obtained after ultrasonic processing was lower indicating ordering the structure of polymeric chains as a result of processing. Additionally, it was observed that the mobility of the PLGA macromolecules was lower within the composite in comparison with the mobility of the chains within the PLGA alone in the case when both were obtained after ultrasonic processing. This was a consequence of the structure formation through the interactions between the PLGA and the HAp. Based on these results different degradation rate of PLGA in composite can be expected, which is important in the application of this material for the controlled drug delivery of medicaments.
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Affiliation(s)
- Marija Vukomanović
- Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez Mihailova 35/IV, 11000 Belgrade, Serbia.
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Oh NM, Oh KT, Baik HJ, Lee BR, Lee AH, Youn YS, Lee ES. A self-organized 3-diethylaminopropyl-bearing glycol chitosan nanogel for tumor acidic pH targeting: In vitro evaluation. Colloids Surf B Biointerfaces 2010; 78:120-6. [DOI: 10.1016/j.colsurfb.2010.02.023] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 02/20/2010] [Accepted: 02/22/2010] [Indexed: 01/28/2023]
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Rafat M, Cléroux CA, Fong WG, Baker AN, Leonard BC, O'Connor MD, Tsilfidis C. PEG-PLA microparticles for encapsulation and delivery of Tat-EGFP to retinal cells. Biomaterials 2010; 31:3414-21. [PMID: 20149443 DOI: 10.1016/j.biomaterials.2010.01.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 01/09/2010] [Indexed: 12/14/2022]
Abstract
The efficient and controlled delivery of genes and proteins to retinal cells remains a challenge. In this study, we evaluated polyethylene glycol-polylactic acid (PEG-PLA) microparticles for encapsulation and delivery of a Transactivator of transcription-enhanced green fluorescent protein fusion (Tat-EGFP) to retinal cells. Our main objective was to develop a microparticle system that delivers Tat-EGFP with an initial rapid release (within 24 h) followed by a sustained release. We prepared four different formulations of Tat-EGFP encapsulated PEG-PLA particles to investigate the effects of protein and polymer concentrations on particle morphology and protein release, using scanning electron microscopy (SEM) and fluorometry techniques. The optimum formulation was selected based on higher protein release, and smaller particle size. The optimum formulation was then tested in vitro for cell biocompatibility and protein internalization, and in vivo for cellular toxicity following sub-retinal injections into rat eyes. The results suggest that PEG-PLA microparticles can deliver proteins in cell culture allowing protein internalization in as little as 1 h. In vivo, protein was shown to localize within the photoreceptor layer of the retina, and persist for at least 9 weeks with no observed toxicity.
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Affiliation(s)
- Mehrdad Rafat
- Ottawa Hospital Research Institute, Ottawa Hospital, General Division, Ottawa, ON, Canada
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Saeed AO, Dey S, Howdle SM, Thurecht KJ, Alexander C. One-pot controlled synthesis of biodegradable and biocompatible co-polymer micelles. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b821736j] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Heffernan MJ, Kasturi SP, Yang SC, Pulendran B, Murthy N. The stimulation of CD8+ T cells by dendritic cells pulsed with polyketal microparticles containing ion-paired protein antigen and poly(inosinic acid)-poly(cytidylic acid). Biomaterials 2008; 30:910-8. [PMID: 19036430 DOI: 10.1016/j.biomaterials.2008.10.034] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Accepted: 10/22/2008] [Indexed: 01/05/2023]
Abstract
New adjuvants and delivery strategies are needed to optimize the ability of protein-based vaccines to elicit CD8(+) T cell responses. We have developed a model vaccine formulation containing ovalbumin (OVA) and the double-stranded RNA analog poly(inosinic acid)-poly(cytidylic acid) (poly(I:C)), a TLR3 agonist. OVA and poly(I:C) were each ion-paired to cetyltrimethylammonium bromide (CTAB) to produce hydrophobic complexes, which were co-encapsulated in pH-sensitive polyketal (PK3) microparticles (1-3 microm) using a single emulsion method. Loading levels ranged from 13.6 to 18.8 microg/mg OVA and 4.8 to 10.3 microg/mg poly(I:C). Murine splenic dendritic cells (DCs) pulsed with PK3-OVA-poly(I:C) microparticles, at antigen doses of 0.01 and 0.1 microg/mL, induced a higher percentage of IFNgamma-producing CD8(+) T cells than DCs treated with PK3-OVA particles or soluble OVA/poly(I:C). A higher antigen dose (1 microg/mL) was less effective, which can be attributed to CTAB toxicity. At the lowest antigen dose (0.01 microg/mL), PK3-OVA-poly(I:C) microparticles also enhanced TNF-alpha and IL-2 production in CD8(+) T cells. These data demonstrate the potential of polyketal microparticles in formulating effective CD8(+) T cell-inducing vaccines comprising protein antigens and dsRNA adjuvants.
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Affiliation(s)
- Michael J Heffernan
- Wallace H. Coulter Department of Biomedical Engineering and Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, GA 30332, USA
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