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Yu Y, Ren S, Shang L, Zuo B, Li G, Gou J, Zhang W. Prolonged joint cavity retention of tranexamic acid achieved by a solid-in-oil-in-gel system: A preliminary study. Int J Pharm 2024; 660:124334. [PMID: 38871135 DOI: 10.1016/j.ijpharm.2024.124334] [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: 03/23/2024] [Revised: 05/21/2024] [Accepted: 06/09/2024] [Indexed: 06/15/2024]
Abstract
Tranexamic acid (TXA) is an anti-fibrinolysis agent widely used in postoperative blood loss management. As a highly water-soluble drug, TXA is suffering from rapid clearance from the action site, therefore, large amount of drug is required when administered either by intravenously or topically. In this study, a TXA preparation with prolonged action site residence was designed using the nano-micro strategy. TXA nanoparticles were dispersed in oil by emulsification followed by lyophilization to give a solid-in-oil suspension, which was used as the oil phase for the preparation of TXA-loaded solid-in-oil-in-water (TXA@S/O/W) system. The particle size of TXA in oil was 207.4 ± 13.50 nm, and the particle size of TXA@S/O/W was 40.5 μm. The emulsion-in-gel system (TXA@S/O/G) was prepared by dispersing TXA@S/O/W in water solution of PLGA-b-PEG-b-PLGA (PPP). And its gelling temperature was determined to be 26.6 ℃ by a rheometer. Sustained drug release was achieved by TXA@S/O/G with 72.85 ± 7.52 % of TXA released at 120 h. Formulation retention at the joint cavity was studied by live imaging, and the fluorescent signals dropped gradually during one week. Drug escape from the injection site via drainage and absorption was investigated by a self-made device and plasma TXA concentration determination, respectively. TXA@S/O/G showed the least drug drainage during test, while more than 70 % of drug was drained in TXA@S/O/W group and TXA solution group. Besides, low yet steady plasma TXA concentration (less than 400 ng/mL) was found after injecting TXA@S/O/G into rat knees at a dosage of 2.5 mg/kg, which was much lower than those of TXA dissolved in PPP gel or TXA solution. In conclusion, sustained drug release as well as prolonged action site retention were simultaneously achieved by the designed TXA@S/O/G system. More importantly, due to the steady plasma concentration, this strategy could be further applied to other highly water-soluble drugs with needs on sustained plasma exposure.
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Affiliation(s)
- Ying Yu
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Shuang Ren
- Department of Pharmacy, Beijing Jishuitan Hospital Affiliated to Capital Medical University, Beijing 100035, China
| | | | | | - Guofei Li
- Department of Pharmacy, Shengjing Hospital of China Medical University, Shenyang 110004, China.
| | - Jingxin Gou
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China.
| | - Wei Zhang
- Department of Pharmacy, Beijing Jishuitan Hospital Affiliated to Capital Medical University, Beijing 100035, China.
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2
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Karimi M, Abrishami M, Farzadnia M, Kamali H, Malaekeh-Nikouei B. In-situ forming biodegradable implants for sustained Fluocinolone acetonide release to the posterior eye: In-vitro and in-vivo investigations in rabbits. Int J Pharm 2024; 654:123973. [PMID: 38458402 DOI: 10.1016/j.ijpharm.2024.123973] [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: 01/29/2024] [Revised: 03/02/2024] [Accepted: 03/03/2024] [Indexed: 03/10/2024]
Abstract
Delivering medication to the posterior segment of the eye presents a significant challenge. Intravitreal injection has emerged as the preferred method for drug delivery to this area. However, current injectable non-biodegradable implants for fluocinolone acetonide (FA) require surgical removal after prolonged drug release, potentially affecting patient compliance. This study aimed to develop an in-situ forming biodegradable implant (ISFBI) optimal formulation containing PLGA504H and PLGA756S (50:50 w/w%) with the additive NMP solvent. The goal was to achieve slow and controlled release of FA over a two-month period with lower burst release, following a single intravitreal injection. Through morphology, rheology, stability and in-vitro release evaluations, the optimal formulation demonstrated low viscosity (0.12-1.25 Pa. s) and sustained release of FA at a rate of 0.36 µg/day from the third day up to two months. Furthermore, histopathology and in-vivo studies were conducted after intravitreal injection of the optimal formulation in rabbits' eye. Pharmacokinetic analysis demonstrated mean residence time (MRT) of 20.02 ± 0.6 days, half-life (t1/2) of 18.80 ± 0.4 days, and clearance (Cl) of 0.29 ± 0.03 ml/h for FA in the vitreous humor, indicating sustained and slow absorption of FA by the targeted retinal tissue from vitrea over the two-month period and eliminating through the anterior section of the eye, as revealed by its presence in the aqueous humor. Additionally, FA exhibited no detection in the blood and no evidence of systemic side effects or damage on the retinal layer and other organs. Based on these findings, it can be concluded that in-situ forming injectable biodegradable PLGA implants can show promise as a long-acting and controlled-release system for intraocular drug delivery.
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Affiliation(s)
- Malihe Karimi
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mojtaba Abrishami
- Department of Ophthalmology, Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mehdi Farzadnia
- Department of Pathology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Kamali
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Bizhan Malaekeh-Nikouei
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
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3
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A multiple controlled-release hydrophilicity minocycline hydrochloride delivery system for the efficient treatment of periodontitis. Int J Pharm 2023; 636:122802. [PMID: 36894039 DOI: 10.1016/j.ijpharm.2023.122802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/04/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023]
Abstract
The complexity of periodontitis, including the complex formation mechanisms and the complex periodontium physiological environment, as well as the complex association with multiple complications, often results in poor therapy effects. Herein, we aimed to design a nanosystem with a controlled release of minocycline hydrochloride (MH) and good retention to effectively treat periodontitis by inhibiting inflammation and repairing the alveolar bone. Firstly, insoluble ion-pairing (IIP) complexes were constructed to improve the encapsulation efficiency of hydrophilic MH in PLGA nanoparticles. Then, a nanogenerator was constructed and combined with a double emulsion method to encapsulate the complexes into PLGA nanoparticles (MH-NPs). The average particle size of MH-NPs was about 100 nm as observed by AFM and TEM, and the drug loading and encapsulation efficiency were 9.59% and 95.58%, respectively. Finally, a multifunctional system (MH-NPs-in-gels) was prepared by dispersing MH-NPs into thermosensitive gels, which could continue to release drug for 21 days in vitro. And the release mechanism showed that this controlled release behavior for MH was influenced by the insoluble ion-pairing complex, PLGA nanoparticles, and gels. In addition, the periodontitis rat model was established to investigate the pharmacodynamic effects. After 4 weeks of treatment, changes in the alveolar bone were assessed by Micro-CT (BV/TV: 70.88%; BMD: 0.97 g/cm3; TB.Th: 0.14 mm; Tb.N: 6.39 mm-1; Tb.Sp: 0.07 mm). The mechanism of MH-NPs-in-gels in vivo was clarified by the analysis of pharmacodynamic results, which showed that insoluble ion-pairing complexes with the aid of PLGA nanoparticles and gels achieved significant anti-inflammatory effects and bone repair capabilities. In conclusion, the multiple controlled-release hydrophilicity MH delivery system would have good prospects for the effective treatment of periodontitis.
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Tint NL, Cheng KKW, Dhillon AS, Keane PA, Alexander P, Kennedy D, Chau DYS, Rose FRAJ, Allan BDS. An in vitro assessment of the thermoreversible PLGA-PEG-PLGA copolymer: Implications for Descemet's membrane endothelial keratoplasty. Clin Exp Ophthalmol 2023; 51:58-66. [PMID: 36086942 DOI: 10.1111/ceo.14167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 08/29/2022] [Accepted: 09/02/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND To explore the use of a thermoreversible copolymer gel coating to prevent donor tissue scrolling in Descemet's membrane endothelial keratoplasty (DMEK). METHODS PLGA-PEG-PLGA triblock copolymer was synthesised via ring opening polymerisation. Two formulations were fabricated and gelation properties characterised using rheological analyses. Endothelial cytotoxicity of the copolymer was assessed using a Trypan Blue exclusion assay. Thickness of the copolymer gel coating on the endothelial surface was analysed using anterior segment optical coherence tomography (OCT) (RTVue-100, Optovue Inc.). Gold nanoparticles were added to the copolymer to aid visualisation using OCT. Prevention of Descemet membrane donor scrolling was represented via a novel, in vitro, immersion of copolymer coated donor graft material. RESULTS Two different formulations of PLGA-PEG-PLGA copolymer were successfully fabricated and the desired peak gelling temperature of 24°C was achieved by polymer blending. Application of 20%, 30% and 40% (wt/vol) polymer concentrations resulted in a statistically significant increase in polymer thickness on the endothelium (p < 0.001). There was no detectable endothelial cytotoxicity. The polymer was easy to apply to the endothelium and prevented scrolling of the DMEK graft. CONCLUSION This PLGA-PEG-PLGA thermoreversible copolymer gel could be exploited as a therapeutic aid for preventing DMEK graft scrolling.
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Affiliation(s)
- Naing L Tint
- Moorfields Eye Hospital NHS Foundation Trust, Cornea and External Eye Disease Service, London, UK.,Princess Alexandra Eye Pavilion, NHS Lothian, Edinburgh, UK
| | | | - Amritpaul S Dhillon
- Division of Regenerative Medicine and Cellular Therapies, Nottingham Biodiscovery Institute, School of Pharmacy Nottingham, University of Nottingham, Nottinghamshire, UK
| | - Pearse A Keane
- Institute of Ophthalmology, University College London, London, UK.,Moorfields Eye Hospital NHS Foundation Trust, NIHR Biomedical Research Centre for Ophthalmology, London, London, UK
| | - Philip Alexander
- Division of Regenerative Medicine and Cellular Therapies, Nottingham Biodiscovery Institute, School of Pharmacy Nottingham, University of Nottingham, Nottinghamshire, UK
| | - David Kennedy
- Moorfields Eye Hospital NHS Foundation Trust, Lions Eye Bank, London, UK
| | - David Y S Chau
- Division of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, London, UK
| | - Felicity R A J Rose
- Division of Regenerative Medicine and Cellular Therapies, Nottingham Biodiscovery Institute, School of Pharmacy Nottingham, University of Nottingham, Nottinghamshire, UK
| | - Bruce D S Allan
- Moorfields Eye Hospital NHS Foundation Trust, Cornea and External Eye Disease Service, London, UK.,Moorfields Eye Hospital NHS Foundation Trust, NIHR Biomedical Research Centre for Ophthalmology, London, London, UK
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5
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Movaffagh J, Hadizadeh F, Khodaverdi E, Khalili B, Rezaeian Shiadeh SN, Kamali H, Oroojalian F. Preparation and in vitro evaluation of injectable formulations of levothyroxine sodium using in situ forming hydrogel temperature-responsive systems based on PLA-PEG-PLA and PLGA-PEG-PLGA triblock copolymers. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2022; 25:341-351. [PMID: 35656181 PMCID: PMC9148395 DOI: 10.22038/ijbms.2022.62576.13842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 02/23/2022] [Indexed: 12/01/2022]
Abstract
OBJECTIVES Recently, great attention has been paid to developing new drug delivery systems to manage the rate, time, and site of drug release. We aimed to design a novel drug delivery system to support targeted and gradual delivery of levothyroxine sodium. MATERIALS AND METHODS The triblock copolymers of PLA-PEG-PLA and PLGA-PEG-PLGA were constructed using the ring-opening copolymerization method and then purified and characterized by 1H-NMR, DSC, and GPC techniques. The phase transition temperature of the polymers was determined, and levothyroxine sodium stability was investigated in a phosphate-based buffer (pH 7.4). In vitro drug release into the PBS was measured at different concentrations of the triblocks for one month. RESULTS The results of NMR and GPC showed successful fabrication of the copolymers with low molecular weight dispersion and Tg points of -8.19 °C and -5.19 °C for PLA-PEG-PLA and PLGA-PEG-PLGA, respectively. Stability tests showed that during one month, most of the triblocks' masses degraded at 37 °C while levothyroxine sodium remained stable. Initial burst release of the drug in both copolymers is inversely correlated with the concentration of the polymer. Evaluation of drug release for 35 days showed that PLA-PEG-PLA had a slower drug release rate than PLGA-PEG-PLGA. CONCLUSION Considering the low initial burst release, as well as continuous and long-term release kinetics of PLA-PEG-PLA and PLGA-PEG-PLGA copolymers, they can be used to gradually deliver levothyroxine sodium, obviating the need for frequent administrations and concerns over drug-food interactions.
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Affiliation(s)
- Jebraeil Movaffagh
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran,Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran , These authors contributed equally to this work
| | - Farzin Hadizadeh
- Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran,Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran, These authors contributed equally to this work
| | - Elham Khodaverdi
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran,Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Bahnaz Khalili
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Hossein Kamali
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran,Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran ,Corresponding authors: Hossein Kamali. Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran. Tel/ Fax: +98-5131801302; ; Fatemeh Oroojlaian. Department of Advanced Technologies, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran. Tel: +98-5832297095; Fax: +98-5832297182;
| | - Fatemeh Oroojalian
- Department of Advanced Technologies, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran,Corresponding authors: Hossein Kamali. Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran. Tel/ Fax: +98-5131801302; ; Fatemeh Oroojlaian. Department of Advanced Technologies, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran. Tel: +98-5832297095; Fax: +98-5832297182;
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6
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Wang M, Lin Y, Gao J, Liu D. DPD simulations on morphologies and structures of blank PLGA- b-PEG- b-PLGA polymeric micelles and docetaxel-loaded PLGA- b-PEG- b-PLGA polymeric micelles. RSC Adv 2022; 12:12078-12088. [PMID: 35481080 PMCID: PMC9020346 DOI: 10.1039/d2ra00940d] [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: 02/13/2022] [Accepted: 04/11/2022] [Indexed: 01/09/2023] Open
Abstract
Dissipative particle dynamics (DPD) simulation was used to study the morphologies and structures of blank (no drug) poly(lactic-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(lactic-co-glycolic acid) (PLGA-b-PEG-b-PLGA) polymeric micelles and the docetaxel (Dtx)-loaded PLGA-b-PEG-b-PLGA polymeric micelles. We focused on the influences of PLGA-b-PEG-b-PLGA copolymer concentration, composition, Dtx drug content and the shear rate on morphologies and structures of the micelles. Our simulations show that the PLGA-b-PEG-b-PLGA copolymers in the aqueous solutions could aggregate and form blank micelles while Dtx drug and PLGA-b-PEG-b-PLGA could aggregate and form drug-loaded micelles. Under different PLGA-b-PEG-b-PLGA concentrations and drug content, the blank and drug-loaded micelles are observed as spherical, onionlike, columnar, and lamellar structures. The onionlike structures are comprised of the PEG hydrophilic core, the PLGA hydrophobic middle layer, and the PEG hydrophilic shell. As the structure of micelles varies from a spherical core–shell structure to a core–middle layer–shell onionlike structure, the distribution of the Dtx drugs diffuses from the core to the PLGA middle layer of the aggregate. In addition, the drug release process of the Dtx-loaded micelles under shear flow is also simulated. And the results show that the spherical micelles turn into a columnar structure under a shear rate from 0.2 to 3.4. When the shear rate increases to 3.5, the Dtx drugs released gradually increase until all are released with time evolution. These findings illustrate the dependence of the structural morphologies on the detailed molecular parameters of PLGA-b-PEG-b-PLGA and Dtx. Dissipative particle dynamics simulation was used to study the morphologies and structures of blank (no drug) poly(lactic-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(lactic-co-glycolic acid) polymeric micelles and the docetaxel-loaded polymeric micelles.![]()
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Affiliation(s)
- Mengyao Wang
- School of Science, North China University of Science and Technology, Tangshan, 063210, P. R. China
| | - Ye Lin
- School of Science, North China University of Science and Technology, Tangshan, 063210, P. R. China
| | - Jianxu Gao
- School of Science, North China University of Science and Technology, Tangshan, 063210, P. R. China
| | - Dongmei Liu
- School of Science, North China University of Science and Technology, Tangshan, 063210, P. R. China
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Mohammadpour F, Kamali H, Hadizadeh F, Bagheri M, Shiadeh SNR, Nazari A, Oroojalian F, Khodaverdi E. The PLGA Microspheres Synthesized by a Thermosensitive Hydrogel Emulsifier for Sustained Release of Risperidone. J Pharm Innov 2021. [DOI: 10.1007/s12247-021-09544-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Giram PS, Wang JTW, Walters AA, Rade PP, Akhtar M, Han S, Faruqu FN, Abdel-Bar HM, Garnaik B, Al-Jamal KT. Green synthesis of methoxy-poly(ethylene glycol)-block-poly(l-lactide-co-glycolide) copolymer using zinc proline as a biocompatible initiator for irinotecan delivery to colon cancer in vivo. Biomater Sci 2021; 9:795-806. [PMID: 33206082 DOI: 10.1039/d0bm01421d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) is the most commonly described biocompatible copolymer used in biomedical applications. In this work, a green synthetic approach based on the biocompatible zinc proline complex, as an initiator for PLGA synthesis, is reported for the first time for the synthesis of methoxy-poly(ethylene glycol)-block-poly(l-lactic-co-glycolic acid) (mPEG-PLGA). mPEG-PLGA with controlled molecular weight and narrow polydispersity was synthesised. Its potential for delivery of irinotecan (Ir), a poorly water-soluble chemotherapeutic drug used for the treatment of colon and pancreatic cancer, was studied. Nanoparticles of controlled size (140-160 nm), surface charge (∼-10 mV), release properties and cytotoxicity against CT-26 (colon) and BxPC-3 (pancreatic) cancer cells, were prepared. Tumor accumulation was confirmed by optical imaging of fluorescently labelled nanoparticles. Unlike Tween® 80 coated NP-Ir, the Pluronic® F-127 coated NP-Ir exhibits significant tumor growth delay compared to untreated and blank formulation treated groups in the CT-26 subcutaneous tumor model, after 4 treatments of 30 mg irinotecan per kg dose. Overall, this proof-of-concept study demonstrates that the newly synthesized copolymer, via a green route, is proven to be nontoxic, requires fewer purification steps and has potential applications in drug delivery.
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Affiliation(s)
- Prabhanjan S Giram
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune-411008, India.
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9
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Bellotti E, Schilling AL, Little SR, Decuzzi P. Injectable thermoresponsive hydrogels as drug delivery system for the treatment of central nervous system disorders: A review. J Control Release 2021; 329:16-35. [PMID: 33259851 DOI: 10.1016/j.jconrel.2020.11.049] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/24/2020] [Accepted: 11/24/2020] [Indexed: 12/13/2022]
Abstract
The central nervous system (CNS), consisting of the brain, spinal cord, and retina, superintends to the acquisition, integration and processing of peripheral information to properly coordinate the activities of the whole body. Neurodegenerative and neurodevelopmental disorders, trauma, stroke, and brain tumors can dramatically affect CNS functions resulting in serious and life-long disabilities. Globally, the societal and economic burden associated with CNS disorders continues to grow with the ageing of the population thus demanding for more effective and definitive treatments. Despite the variety of clinically available therapeutic molecules, medical interventions on CNS disorders are mostly limited to treat symptoms rather than halting or reversing disease progression. This is attributed to the complexity of the underlying disease mechanisms as well as to the unique biological microenvironment. Given its central importance, multiple barriers, including the blood brain barrier and the blood cerebrospinal fluid barrier, protect the CNS from external agents. This limits the access of drug molecules to the CNS thus contributing to the modest therapeutic successes. Loco-regional therapies based on the deposition of thermoresponsive hydrogels loaded with therapeutic agents and cells are receiving much attention as an alternative and potentially more effective approach to manage CNS disorders. In this work, the current understanding and challenges in the design of thermoresponsive hydrogels for CNS therapy are reviewed. First, the biological barriers that hinder mass and drug transport to the CNS are described, highlighting the distinct features of each barrier. Then, the realization, characterization and biomedical application of natural and synthetic thermoresponsive hydrogels are critically presented. Advantages and limitations of each design and application are discussed with the objective of identifying general rules that could enhance the effective translation of thermoresponsive hydrogel-based therapies for the treatment of CNS disorders.
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Affiliation(s)
- Elena Bellotti
- Laboratory of Nanotechnology for Precision Medicine, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
| | - Andrea L Schilling
- Department of Chemical Engineering, University of Pittsburgh, 427 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA
| | - Steven R Little
- Department of Chemical Engineering, University of Pittsburgh, 427 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA; Department of Bioengineering, University of Pittsburgh, 302 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15216, USA; Department of Clinical and Translational Science, University of Pittsburgh, Forbes tower, Suite 7057, Pittsburgh, PA 15213, USA; McGowan Institute of Regenerative Medicine, University of Pittsburgh, 450 Technology Drive, Suite 300, Pittsburgh, PA, 15219, USA; Department of Immunology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, PA, 15213, USA; Department of Pharmaceutical Science, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA, 15213, USA
| | - Paolo Decuzzi
- Laboratory of Nanotechnology for Precision Medicine, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
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10
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Optimization and in Vitro Evaluation of Injectable Sustained-Release of Levothyroxine Using PLGA-PEG-PLGA. J Pharm Innov 2020. [DOI: 10.1007/s12247-020-09480-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Abstract
Purpose
In situ-forming gels (semi-solid state) (ISFGs) are widely used as sustained drug delivery, but they show a high burst release as well. The purpose of the current study is to make triblock that can make a quick gel on injection with a minimum burst release.
Methods
In this study, to control the release of levothyroxine from ISFG, PLGA-PEG-PLGA (triblock) polymer was used. The melting method was employed to synthesize the triblock via ring-opening polymerization (ROP). Different weight percentages of triblock in the formulation were investigated to reach the minimum initial burst release of levothyroxine from ISFGs. Furthermore, the results of the in-situ forming implant (solid-state) (ISFI) of levothyroxine prepared from PLGA 504 H polymers were compared with ISFG.
Results
The melting method employed in this study showed a successful ROP of the triblock. As the % triblock concentration was increased from 30 to 50%, the initial burst release decreased significantly. The initial burst release levothyroxine from ISFG (6.52 ± 0.30%) was much lower than the amount of levothyroxine released from ISFI (14.15 ± 0.79%). No cytotoxicity was observed for the sustained-release formulation containing ISFG 50% according to the MTT assay.
Conclusion
The results indicated that this formulation was safe to be administered subcutaneously. As the synthesized triblock has thermosensitive properties, and also has the hydrogen bonding between the N-methyl pyrrolidone molecules and PEG, therefore, these properties make ISFG formulation to have a smaller initial burst release compared to ISFI formulation.
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11
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Ocular films versus film-forming liquid systems for enhanced ocular drug delivery. Drug Deliv Transl Res 2020; 11:1084-1095. [PMID: 32728811 DOI: 10.1007/s13346-020-00825-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The short residence time, corneal barrier functions, and other effective eye protective mechanisms limited the ocular availability after topical application. Ocular inserts are being developed as polymer films for insertion into the conjunctival sac with the goal of increasing ocular availability. Unfortunately, these devices are not convenient for patients and are associated with many problems. The use of in situ gel/film-forming systems may provide promising alternative with comparable efficacy but this requires verification. Therefore, the current study compared ocular inserts with in situ film-forming liquids containing the same polymer components for ocular delivery of pilocarpine nitrate. Solvent casting technique was employed to prepare the inserts using and polyvinyl alcohol (PVA) as film-forming polymer blended with sodium alginate, as bioadhesive polymer. The effect of addition of either carboxymethycellulose, carbopol, polyvinylpyrrolidone, or methylcellulose was investigated. Solid-state characterization of the inserts indicated compatibility of the drug with film component. All inserts were of acceptable bioadhesive parameters and folding endurance that depended on the film composition. In vitro release studies reflected matrix diffusion kinetics for the film and liquid formulations. This confirms the in situ gelation of liquids. The calculated in vivo miotic pharmacokinetics parameters, using albino rabbits, reflected a better rank for the film but the difference was not statistically different from the in situ gel/film-forming systems. Ocular safety, as reflected by tear volume test, indicated acceptable safety of both liquid and inserts to the eye. The study suggested comparable efficacy of film-forming liquids to that of ocular films. Graphical abstract.
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12
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Lin SY. Thermoresponsive gating membranes embedded with liquid crystal(s) for pulsatile transdermal drug delivery: An overview and perspectives. J Control Release 2019; 319:450-474. [PMID: 31901369 DOI: 10.1016/j.jconrel.2019.12.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/27/2019] [Accepted: 12/28/2019] [Indexed: 01/08/2023]
Abstract
Due to the circadian rhythm regulation of almost every biological process in the human body, physiological and biochemical conditions vary considerably over the course of a 24-h period. Thus, optimal drug delivery and therapy should be effectively controlled to achieve the desired therapeutic plasma concentrations and therapeutic drug responses at the required time according to chronopharmacological concepts, rather than continuous maintenance of constant drug concentrations for an extended time period. For many drugs, it is not always necessary to constantly deliver a drug into the human body under disease conditions due to rhythmic variations. Pulsatile drug delivery systems (PDDSs) have been receiving more attention in pharmaceutical development by providing a predetermined lag period, followed by a fast or rate-controlled drug release after application. PDDSs are characterized by a programmed drug release, which may release a drug at repeatable pulses to match the biological and clinical needs of a given disease therapy. This review article focuses on thermoresponsive gating membranes embedded with liquid crystals (LCs) for transdermal drug delivery using PDDS technology. In addition, the principal rationale and the advanced approaches for the use of PDDSs, the marketed products of chronotherapeutic DDSs with pulsatile function designed by various PDDS technologies, pulsatile drug delivery designed with thermoresponsive polymers, challenges and opportunities of transdermal drug delivery, and novel approaches of LC systems for drug delivery are reviewed and discussed. A brief overview of all academic research articles concerning single LC- or binary LC-embedded thermoresponsive membranes with a switchable on-off permeation function through topical application by an external temperature control, which may modulate the dosing interval and administration time according to the therapeutic needs of the human body, is also compiled and presented. In the near future, since thermal-based approaches have become a well-accepted method to enhance transdermal delivery of different water-soluble drugs and macromolecules, a combination of the thermal-assisted approach with thermoresponsive LCs membranes will have the potential to improve PDDS applications but still poses a great challenge.
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Affiliation(s)
- Shan-Yang Lin
- Laboratory of Pharmaceutics and Biopharmaceutics, Department of Biotechnology and Pharmaceutical Technology, Yuanpei University of Medical Technology, No.306, Yuanpei Street, Hsin Chu 30015, Taiwan.
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Sulaiman TNS, Larasati D, Nugroho AK, Choiri S. Assessment of the Effect of PLGA Co-polymers and PEG on the Formation and Characteristics of PLGA-PEG-PLGA Co-block Polymer Using Statistical Approach. Adv Pharm Bull 2019; 9:382-392. [PMID: 31592431 PMCID: PMC6773940 DOI: 10.15171/apb.2019.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 04/20/2019] [Accepted: 05/20/2019] [Indexed: 02/04/2023] Open
Abstract
Purpose: To assess the effect of the lactic acid (LA)-to-glycolic acid (GA) molar ratio and polyethylene glycol (PEG) concentration on the formation of poly-lactide co-glycolide acid (PLGA)-PEG-PLGA co-block polymers simultaneously using statistical approach. Methods: A 22 full factorial design with the addition of a point in the center of the design, namely curvature, was applied. Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), and nuclear magnetic resonance (NMR) were performed to confirm the formation of the co-block polymer. Simvastatin (SMV), a drug model was incorporated into the nano-polymeric micellar (NpM) of PLGA-PEG-PLGA followed by solubility phase, particle size, zeta potential, and entrapment efficiency characterizations. Results: FTIR, DSC, and NMR successfully confirmed the formation of co-block polymers. Solubility of SMV increased from 2 to 44-folds depending on co-block concentration with entrapment efficiency of 59%-80%. The NpM had size in the range of 206 to 402 nm with negative zeta potential. LA to GA ratio had greater effect on particle size reduction and increasing of co-polymer length. In addition, it had higher contributions on increasing of solubility and entrapment efficiency of SMV than PEG. Conclusion: According to these findings, the LA to GA ratio and PEG concentration gained a great consideration in order to prepare the PLGA-PEG-PLGA co-block which fulfilled the quality target product profile of NpM delivery system.
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Affiliation(s)
| | - Dwi Larasati
- Faculty of Pharmacy, Universitas Gadjah Mada, Sekip Utara, Yogyakarta, Indonesia 55281
| | - Akhmad Kharis Nugroho
- Department of Pharmaceutics, Universitas Gadjah Mada, Sekip Utara, Yogyakarta, Indonesia 55281
| | - Syaiful Choiri
- Pharmaceutical Technology and Drug Delivery, Department of Pharmacy, Universitas Sebelas Maret, Ir. Sutami 36A, Surakarta, Indonesia, 57126
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Kamali H, Khodaverdi E, Hadizadeh F, Mohajeri SA, Nazari A, Jafarian AH. Comparison of in-situ forming composite using PLGA-PEG-PLGA with in-situ forming implant using PLGA: In-vitro, ex-vivo, and in-vivo evaluation of naltrexone release. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.01.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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15
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Ring-opening polymerization of poly (d,l-lactide-co-glycolide)-poly(ethylene glycol) diblock copolymer using supercritical CO2. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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In-vitro, ex-vivo, and in-vivo evaluation of buprenorphine HCl release from an in situ forming gel of PLGA-PEG-PLGA using N‑methyl‑2‑pyrrolidone as solvent. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 96:561-575. [DOI: 10.1016/j.msec.2018.11.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 10/23/2018] [Accepted: 11/27/2018] [Indexed: 02/08/2023]
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Khodaverdi E, Tayarani-Najaran Z, Minbashi E, Alibolandi M, Hosseini J, Sepahi S, Kamali H, Hadizadeh F. Docetaxel-Loaded Mixed Micelles and Polymersomes Composed of Poly (caprolactone)-Poly (ethylene glycol) (PEG-PCL) and Poly (lactic acid)-Poly (ethylene glycol) (PEG-PLA): Preparation and In-vitro Characterization. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2019; 18:142-155. [PMID: 31089351 PMCID: PMC6487438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Microwave irradiation was used to synthesize poly (caprolactone)-poly (ethylene glycol) (PEG-PCL) and poly (lactic acid)-poly (ethylene glycol) (PEG-PLA) copolymers that are composed of biodegradable polymers including PEG, PLA, and PCL. These copolymers were used for loading docetaxel in nanoparticles. Single emulsion-solvent evaporation technique was applied for preparing the PEG-PLA and PEG-PCL mixed nanoparticles (micelles and polymersomes) with different proportions, including 0:1, 1:1, 3:1, 1:3, and 1:0. The unimodal gel permeation chromatography curve showed low polydispersity of the di-block copolymers. The in-vitro drug release curves of formulations were compared. Micelles and polymersomes of 75% PEG-PCL and 25% PEG-PLA (P5 and M5) have the lowest burst release (5%) at the same period compared to the other copolymers. The dynamic light scattering and TEM results clarified that the size and shape of the formulations are uniform. The cytotoxicity effect of P5 and M5 was evaluated in different cell lines. The best one was found to P5 with half maximal inhibitory concentration (IC50) between 1.48-11.79 µg/mL. The pro-apoptotic effect of P5 was confirmed with flow cytometry study. These mixed micelles (M5) and polymersomes (P5) was found to be superior formulations than non-mixed ones.
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Affiliation(s)
- Elham Khodaverdi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Zahra Tayarani-Najaran
- Department of Pharmacolgy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Elham Minbashi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Mona Alibolandi
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Javad Hosseini
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Samaneh Sepahi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Hossein Kamali
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Farzin Hadizadeh
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran. ,Corresponding author: E-mail:
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Kamali H, Khodaverdi E, Hadizadeh F, Mohajeri SA, Kamali Y, Jafarian AH. In-vitro, ex-vivo, and in-vivo release evaluation of in situ forming buprenorphine implants using mixture of PLGA copolymers and additives. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2018.1525541] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Hossein Kamali
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Elham Khodaverdi
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Pharmaceutics, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farzin Hadizadeh
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Ahmad Mohajeri
- Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Younes Kamali
- Department of Basic Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Amir Hossein Jafarian
- Ghaem Hospital, Cancer Molecular Pathology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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Steinman NY, Haim‐Zada M, Goldstein IA, Goldberg AH, Haber T, Berlin JM, Domb AJ. Effect of PLGA block molecular weight on gelling temperature of PLGA‐PEG‐PLGA thermoresponsive copolymers. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.29275] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Noam Y. Steinman
- Institute of Drug Research, School of Pharmacy‐Faculty of MedicineThe Hebrew University of Jerusalem Jerusalem 91120 Israel
| | - Moran Haim‐Zada
- Institute of Drug Research, School of Pharmacy‐Faculty of MedicineThe Hebrew University of Jerusalem Jerusalem 91120 Israel
| | - Isaac A. Goldstein
- Institute of Drug Research, School of Pharmacy‐Faculty of MedicineThe Hebrew University of Jerusalem Jerusalem 91120 Israel
| | - Ayelet H. Goldberg
- Institute of Drug Research, School of Pharmacy‐Faculty of MedicineThe Hebrew University of Jerusalem Jerusalem 91120 Israel
| | - Tom Haber
- Department of Molecular MedicineCity of Hope Beckman Research Institute 1500 East Duarte Road, Duarte California 91010
| | - Jacob M. Berlin
- Department of Molecular MedicineCity of Hope Beckman Research Institute 1500 East Duarte Road, Duarte California 91010
| | - Abraham J. Domb
- Institute of Drug Research, School of Pharmacy‐Faculty of MedicineThe Hebrew University of Jerusalem Jerusalem 91120 Israel
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El-Zaafarany GM, Soliman ME, Mansour S, Cespi M, Palmieri GF, Illum L, Casettari L, Awad GAS. A Tailored Thermosensitive PLGA-PEG-PLGA/Emulsomes Composite for Enhanced Oxcarbazepine Brain Delivery via the Nasal Route. Pharmaceutics 2018; 10:E217. [PMID: 30400577 PMCID: PMC6321319 DOI: 10.3390/pharmaceutics10040217] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 10/28/2018] [Accepted: 11/01/2018] [Indexed: 12/31/2022] Open
Abstract
The use of nanocarrier delivery systems for direct nose to brain drug delivery shows promise for achieving increased brain drug levels as compared to simple solution systems. An example of such nanocarriers is emulsomes formed from lipid cores surrounded and stabilised by a corona of phospholipids (PC) and a coating of Tween 80, which combines the properties of both liposomes and emulsions. Oxcarbazepine (OX), an antiepileptic drug, was entrapped in emulsomes and then localized in a poly(lactic acid-co-glycolic acid)-poly(ethylene glycol)-poly(lactic acid-co-glycolic acid) (PLGA-PEG-PLGA) triblock copolymer thermogel. The incorporation of OX emulsomes in thermogels retarded drug release and increased its residence time (MRT) in rats. The OX-emulsome and the OX-emulsome-thermogel formulations showed in vitro sustained drug release of 81.1 and 53.5%, respectively, over a period of 24 h. The pharmacokinetic studies in rats showed transport of OX to the systemic circulation after nasal administration with a higher uptake in the brain tissue in case of OX-emulsomes and highest MRT for OX-emulsomal-thermogels as compared to the IN OX-emulsomes, OX-solution and Trileptal® suspension. Histopathological examination of nasal tissues showed a mild vascular congestion and moderate inflammatory changes around congested vessels compared to saline control, but lower toxic effect than that reported in case of the drug solution.
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Affiliation(s)
- Ghada M El-Zaafarany
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
| | - Mahmoud E Soliman
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
| | - Samar Mansour
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
- Department of Pharmaceutical Technology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Al-Tagmoaa Alkhames, Cairo 11835, Egypt.
| | - Marco Cespi
- School of Pharmacy, University of Camerino, Via S. Agostino 1, 62032 Camerino (MC), Italy.
| | | | - Lisbeth Illum
- IDentity, 19 Cavendish Crescent North, The Park, Nottingham NG7 1BA, UK.
| | - Luca Casettari
- Department of Biomolecular Sciences, School of Pharmacy, University of Urbino, Piazza del Rinascimento 6, 61029 Urbino (PU), Italy.
| | - Gehanne A S Awad
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
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21
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Kamali H, Khodaverdi E, Hadizadeh F, Yazdian-Robati R, Haghbin A, Zohuri G. An in-situ forming implant formulation of naltrexone with minimum initial burst release using mixture of PLGA copolymers and ethyl heptanoate as an additive: In-vitro, ex-vivo, and in-vivo release evaluation. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2018.06.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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22
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Nasrollahi P, Khajeh K, Tamjid E, Taleb M, Soleimani M, Nie G. Sustained release of sodium deoxycholate from PLGA-PEG-PLGA thermosensitive polymer. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2018; 46:1170-1177. [PMID: 29989444 DOI: 10.1080/21691401.2018.1481861] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Delivery of the drugs to the target tissue and reducing their side effects on surrounding tissues is still a significant challenge for pharmaceutical scientists. The aim of this study was to investigate the suitability of PLGA-PEG-PLGA triblock copolymer as a matrix material for a sustained-release system of sodium deoxycholate (NaDC). The copolymer was synthesized by ring-opening polymerization reaction, using microwave irradiation and characterized by different techniques. It was shown that the introduction of NaDC to the PLGA-PEG-PLGA copolymer did not influence its inherent sol-gel transition behaviour, but increased the sol-gel transition. The results showed the appropriate NaDC/polymer interaction and the formation of NaDC/polymer-mixed micelle. The sustained release of NaDC from the copolymer lasted for 2 days. This release can be attributed to the formation of NaDC/polymer-mixed micelles and trapping NaDC in the copolymer matrix. The cytolytic efficacy of NaDC-loaded copolymer and sustained release of NaDC were investigated on human adipocytes. Overall a sustained-release formulation for NaDC can be used to study localized fat dissolution.
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Affiliation(s)
- Parisa Nasrollahi
- a Department of Nanobiotechnology, Faculty of Biological Sciences , Tarbiat Modares University , Tehran , Iran
| | - Khosro Khajeh
- a Department of Nanobiotechnology, Faculty of Biological Sciences , Tarbiat Modares University , Tehran , Iran.,b Department of Biochemistry, Faculty of Biological Sciences , Tarbiat Modares University , Tehran , Iran
| | - Elnaz Tamjid
- a Department of Nanobiotechnology, Faculty of Biological Sciences , Tarbiat Modares University , Tehran , Iran
| | - Mohammad Taleb
- c Department of Biomedical Effect of Nanomaterial and Nanosafety , National Center for Nanoscience and Technology , Beijing , China
| | - Masoud Soleimani
- d Department of Hematology, Faculty of Medical Sciences , Tarbiat Modares University , Tehran , Iran
| | - Guangjun Nie
- c Department of Biomedical Effect of Nanomaterial and Nanosafety , National Center for Nanoscience and Technology , Beijing , China
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23
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Kamali H, Khodaverdi E, Hadizadeh F. Ring-opening polymerization of PLGA-PEG-PLGA triblock copolymer in supercritical carbon dioxide. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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24
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Salatin S, Barar J, Barzegar-Jalali M, Adibkia K, Jelvehgari M. Thermosensitive in situ nanocomposite of rivastigmine hydrogen tartrate as an intranasal delivery system: Development, characterization, ex vivo permeation and cellular studies. Colloids Surf B Biointerfaces 2017; 159:629-638. [PMID: 28865359 DOI: 10.1016/j.colsurfb.2017.08.031] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 08/07/2017] [Accepted: 08/17/2017] [Indexed: 12/22/2022]
Abstract
Intranasal administration of pharmaceutical compounds is gaining considerable attention as an alternative route for localized/systemic drug delivery. However, insufficient therapeutic efficacy of drugs via this route seems to be a major challenge for development of de novo intranasal formulations. This shortcoming can be overcome by simultaneous utilization of a nanoparticulate delivery system with a polymeric gel network. Therefore, the main aim of the present study was to develop erodible in-situ gel forming systems of poloxamer 407® (P407) as a promising platform, capable of prolonging rivastigmine hydrogen tartrate (RHT) release from the embedded poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs). PLGA NPs containing RHT were formulated and characterized, then were embedded in P407 gel forming matrix and analyzed in terms of viscosity, stability, gelation temperature, loading efficiency and mucoahesive behavior. The cytotoxicity of NPs was evaluated on A549 cell line using MTT assay. Cellular uptake of the NPs was also measured by means of fluorescence microcopy and flow cytometry analyses. The formulations were finally evaluated for their permeability across sheep nasal mucosa. A linear dependence of sol-gel temperature (Tsol-gel) on the P407 concentration was observed, and a P407 content of 18% was selected. The loading efficiencies of formulations were found to be around 100.22-104.31%. The RHT-loaded NPs showed a suitable cytocompatibility on A549 cells with a time-dependent increase in cellular uptake. Besides, nanocomposites showed higher amounts of drug permeation through nasal sheep mucosa than plain drug gel. Taken all, it is concluded that the formulated nanocomposites may be considered as useful drug delivery systems for the nasal delivery of RHT with enhanced therapeutic efficacy.
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Affiliation(s)
- S Salatin
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran; Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - J Barar
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Pharmaceutics, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - M Barzegar-Jalali
- Department of Pharmaceutics, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Kh Adibkia
- Department of Pharmaceutics, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran; Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - M Jelvehgari
- Department of Pharmaceutics, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran; Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
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Santoveña A, Monzón C, Alvarez-Lorenzo C, Del Rosario C, Delgado A, Evora C, Concheiro A, Llabrés M, Fariña JB. Structure-Performance Relationships of Temperature-Responsive PLGA-PEG-PLGA Gels for Sustained Release of Bone Morphogenetic Protein-2. J Pharm Sci 2017; 106:3353-3362. [PMID: 28732712 DOI: 10.1016/j.xphs.2017.07.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/05/2017] [Accepted: 07/11/2017] [Indexed: 12/29/2022]
Abstract
PLGA (poly(lactic-co-glycolic) acid)-PEG (polyethylene glycol)-PLGA synthesis conditions have an impact on the physicochemical features of the copolymer and its usefulness as biomaterial. This study reports on an analysis of the composition and structural properties of PLGA-PEG-PLGA copolymers applying a variety of analytical techniques. Viscoelastic properties and particularly the temperature-responsive behavior of PLGA-PEG-PLGA showed a marked dependence on copolymer structural features. Physicochemical and biological properties, such as bioadhesion, biocompatibility and cell viability, of the raw copolymers and their gels were also evaluated. The most promising copolymer was chosen to formulate the osteoinductive protein bone morphogenetic protein-2 (125I-BMP-2), and the ability of its gels to sustain the release both in vitro and in vivo was monitored in situ using a gamma counter. In vitro diffusion studies were carried out using a bioinspired set-up that included a biorelevant receptor medium. In vivo release tests after implantation in a critical-size calvarial defect model showed an important burst, but then the release fitted well to the square-root kinetics. Importantly, the release rate constants recorded in vitro and in vivo matched each other suggesting close in vitro-in vivo correlation. Overall, the information gathered opens new perspectives in the biomedical application of these temperature-sensitive materials.
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Affiliation(s)
- Ana Santoveña
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain; Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias (IUETSPC), Universidad de La Laguna (ULL), Campus de Anchieta, 38203 La Laguna (Tenerife), Spain.
| | - Cecilia Monzón
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, R+DPharma Group (GI-1645), Facultad de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Carlos Del Rosario
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain
| | - Araceli Delgado
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain
| | - Carmen Evora
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain
| | - Angel Concheiro
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, R+DPharma Group (GI-1645), Facultad de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Matias Llabrés
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain; Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias (IUETSPC), Universidad de La Laguna (ULL), Campus de Anchieta, 38203 La Laguna (Tenerife), Spain
| | - José B Fariña
- Departamento de Ingeniería Química y Tecnología Farmacéutica, Facultad de Ciencias de la Salud, Universidad de La Laguna (ULL), Campus de Anchieta, 38200 La Laguna (Tenerife), Spain; Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias (IUETSPC), Universidad de La Laguna (ULL), Campus de Anchieta, 38203 La Laguna (Tenerife), Spain
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Fu X, Zeng H, Guo J, Liu H, Shi Z, Chen H, Li D, Xie X, Kuang C. A PLGA–PEG–PLGA Thermosensitive Gel Enabling Sustained Delivery of Ropivacaine Hydrochloride for Postoperative Pain Relief. Chem Pharm Bull (Tokyo) 2017; 65:229-235. [DOI: 10.1248/cpb.c16-00471] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Xudong Fu
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
| | - Huilin Zeng
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
| | - Jiaping Guo
- Department of Maxillofacial Surgery, Wuhan General Hospital of Chinese PLA
| | - Hong Liu
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
| | - Zhen Shi
- Department of Anesthesiology, Wuhan General Hospital of Chinese PLA
| | - Huhai Chen
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
| | - Dezong Li
- Department of Medical Experiment, Wuhan General Hospital of Chinese PLA
| | - Xiangyang Xie
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
| | - Changchun Kuang
- Department of Pharmacy, Wuhan General Hospital of Chinese PLA
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Feng Y, Wang F, Zhang XW, Bhutani H, Ye B. Characterizations and bioactivities of abendazole sulfoxide-loaded thermo-sensitive hydrogel. Parasitol Res 2016; 116:921-928. [PMID: 28028630 DOI: 10.1007/s00436-016-5365-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 12/20/2016] [Indexed: 01/10/2023]
Abstract
Albendazole (ABZ), a widely used anthelmintic, attributes its primary metabolite-albendazole sulfoxide (ABZSO)-as an effective agent against helminthes. For a purpose of long-lasting releasing ABZSO in a special lesion, the present study successfully manufactured ABZSO-loaded thermo-sensitive hydrogel, which was proved by FTIR and 1H NMR, in the interim; in vitro and in vivo behaviors of the thermo-sensitive hydrogel containing ABZSO were studied too. The in vivo pharmacokinetics parameters indicated ABZSO-loaded hydrogel as a better choice for sustained release compared with simple ABZSO. Additionally, the effect of the prepared hydrogels against helminth was investigated by the lethality of Caenorhabditis elegans, the results indicated that the lethality of ABZSO-loaded hydrogel (1, 2, and 4 mg/ml, respectively) on C. elegans was higher than that of PLGA-PEG-PLGA group (P < 0.05). It suggested that the hydrogels loaded with albendazole sulfoxide could be considered highly effective against the nematode C. elegans.
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Affiliation(s)
- Yi Feng
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Fen Wang
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Xue-Wei Zhang
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Harshit Bhutani
- Batch 2013, Clinical Medicine, College of Overseas Student, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Bin Ye
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, 400016, People's Republic of China. .,Research Center for Molecule Medicine and Tumor, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
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Khodaverdi E, Javan M, Tabassi SAS, Khameneh B, Kamali H, Hadizadeh F. Sustained drug delivery system for insulin using supramolecular hydrogels composed of tri-block copolymers. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2016. [DOI: 10.1007/s40005-016-0290-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Mohajeri SA, Yaghoubi S, Abdollahi E, Tekie FSM, Kamali H, Khodaverdi E, Hadizadeh F. In-vivo study of naltrexone hydrochloride release from an in-situ forming PLGA-PEG-PLGA system in the rabbit. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2016.10.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Polylactic Acid Based Nanocomposites: Promising Safe and Biodegradable Materials in Biomedical Field. INT J POLYM SCI 2016. [DOI: 10.1155/2016/6869154] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Polylactic acid (PLA) is widely used in biological areas due to its excellent compatibility, bioabsorbability, and degradation behavior in human bodies. Pure polylactic acid has difficulty in meeting all the requirements that specific field may demand. Therefore, PLA based nanocomposites are extensively investigated over the past few decades. PLA based nanocomposites include PLA based copolymers in nanometer size and nanocomposites with PLA or PLA copolymers as matrix and nanofillers as annexing agent. The small scale effect and surface effect of nanomaterials help improve the properties of PLA and make PLA based nanocomposites more popular compared with pure PLA materials. This review mainly introduces different kinds of PLA based nanocomposites in recent researches that have great potential to be used in biomedical fields including bone substitute and repair, tissue engineering, and drug delivery system.
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Study of an injectable in situ forming gel for sustained-release of Ivermectin in vitro and in vivo. Int J Biol Macromol 2015; 85:271-6. [PMID: 26708436 DOI: 10.1016/j.ijbiomac.2015.12.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 11/28/2015] [Accepted: 12/11/2015] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to develop an in situ forming gel based on SAIB-PLA composite matrix depot for sustained release of Ivermectin. The burst release and cumulative release were significantly reduced with the increased content of solvents and the minimum burst release and cumulative release were found in formulations with NMP. With the addition of PLA in the NMP based gel, burst release and cumulative release were reduced. When concentration of IVM raised from 1% to 2% and 4%, cumulative release was 2.4-2.9 and 3.1-3.7 times that of 1%. The optimal prescription displayed a slow in vitro release rate with 10.46% burst release and 80% cumulative release in 80 days. Pharmacokinetic results indicate that the effective blood concentration of the gel could be maintained up to 110-120 days, t1/2λz of the gels was (24.37 ± 1.71) days and MRT was (32.86 ± 0.91) days.
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Nakagawa H, Matsumoto Y, Matsumoto Y, Miwa Y, Nagasaki Y. Design of high-performance anti-adhesion agent using injectable gel with an anti-oxidative stress function. Biomaterials 2015; 69:165-73. [DOI: 10.1016/j.biomaterials.2015.08.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 08/07/2015] [Indexed: 01/13/2023]
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Khodaverdi E, Heidari Z, Tabassi SAS, Tafaghodi M, Alibolandi M, Tekie FSM, Khameneh B, Hadizadeh F. Injectable supramolecular hydrogel from insulin-loaded triblock PCL-PEG-PCL copolymer and γ-cyclodextrin with sustained-release property. AAPS PharmSciTech 2015; 16:140-9. [PMID: 25224297 DOI: 10.1208/s12249-014-0198-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Accepted: 08/07/2014] [Indexed: 12/20/2022] Open
Abstract
Supramolecular hydrogels formed by cyclodextrins and polymers have been widely investigated as a biocompatible, biodegradable and controllable drug delivery system. In this study, a supramolecular hydrogel based on biodegradable poly(caprolactone)-poly(ethylene glycol)-poly(caprolactone) (PCL-PEG-PCL) triblock copolymers and γ-cyclodextrin (γ-CD) was prepared through inclusion complexation as an injectable, sustained-release vehicle for insulin. The triblock copolymer PCL-PEG-PCL was synthesised by the ring-opening polymerisation method, using microwave irradiation. The polymerisation reaction and the copolymer structures were evaluated by nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The supramolecular hydrogel was prepared in aqueous solution by blending an aqueous γ-CD solution with an aqueous solution of PCL-PEG-PCL triblock copolymer at room temperature. In vitro insulin release through the hydrogel system was studied. The relative surface hydrophobicity of standard and released insulin from the SMGel was estimated using 8-anilino-1-naphthalene sulfonic acid (ANS). Results of (1)HNMR and gel permeation chromatography revealed that microwave irradiation is a simple and reliable method for synthesis of PCL-PEG-PCL copolymer. Gelation occurred within a minute. The supramolecular hydrogel obtained by mixing 10.54% (w/v) γ-CD and 2.5% (w/v) copolymer had an excellent syringeability. Insulin was released up to 80% over a period of 20 days. Insulin kept its initial folding after formulating and releasing from SMGel. A supramolecular hydrogel based on complexation of triblock PCL-PEG-PCL copolymer with γ-cyclodextrin is a suitable system for providing sustained release of therapeutic proteins, with desirable flow behaviour.
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Zhen W, Zhu Y, Wang W, Hou Z. Synthesis and Properties of Amphipathic Poly(D,L-lactide-co-glycolide)-polyethylene glycol-poly(D,L-lactide-co-glycolide) Triblock Copolymers. Aust J Chem 2015. [DOI: 10.1071/ch15094] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this paper, amphipathic poly(d,l-lactide-co-glycolide)-polyethylene glycol-poly(d,l-lactide-co-glycolide) (PLGA-PEG-PLGA) triblock copolymers were synthesized via bulk ring-opening polymerization with d,l-lactide (d,l-LA), glycolide (GA), and polyethylene glycol (PEG) as raw materials and tin(ii) bis(2-ethylhexanoate) (Sn(Oct)2) as catalyst. The synthesis and purification processes were free from organic solvent. The chemical structure of PLGA-PEG-PLGA was characterized by Fourier transform infrared spectroscopy, 1H NMR, gel permeation chromatography, differential scanning calorimetry, and thermo gravimetric analysis. The thermo-sensitivity of PLGA-PEG-PLGA aqueous solution was examined, and the results showed that the copolymers concentration, mass ratio of d,l-LA/GA, and molecular weight of PEG played important parts in controlling the sol–gel transition temperature. The sol–gel transition occurred at lower temperatures with higher copolymer concentrations and mass ratios of d,l-LA/GA. In contrast, the sol–gel transition temperature increased with higher molecular weights of PEG. In vitro drug release studies were carried out using ceftibuten as a model drug. The results indicated that PLGA-PEG-PLGA prepared with 30 wt-% PEG1500 and 70 wt-% PLGA (mass ratio of d,l-LA/GA = 2 : 1) was an effective system for achieving long-sustained controlled release. The drug release from the hydrogel showed a higher initial release followed by a slower pattern up to 120 h, and the mean retention time was ~50 h.
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Sustained drug release using supramolecular hydrogels composed of cyclodextrin inclusion complexes with PCL/PEG multiple block copolymers. IRANIAN POLYMER JOURNAL 2014. [DOI: 10.1007/s13726-014-0265-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Razavilar N, Choi P. Molecular dynamics study of the diffusivity of a hydrophobic drug Cucurbitacin B in pseudo-poly(ethylene oxide-b-caprolactone) micelle environments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7798-7803. [PMID: 24927468 DOI: 10.1021/la500572p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Isobaric-isothermal molecular dynamics simulation was used to study the diffusion of a hydrophobic drug Cucurbitacin B (CuB) in pseudomicelle environments consisting of poly(ethylene oxide-b-caprolactone) (PEO-b-PCL) swollen by various amounts of water. Two PEO-b-PCL configurations, linear and branched, with the same total molecular weight were used. For the branched configuration, the block copolymer contained one linear block of PEO with the same molecular weight as that of the PEO block used in the linear configuration but with one end connecting to three PCL blocks with the same chain length, hereafter denoted PEO-b-3PCL. Regardless of the configuration, the simulation results showed that the diffusivity of CuB was insensitive to the water concentration up to ∼8 wt % while that of water decreased with an increasing water concentration. The diffusivity of CuB (10(-8) cm(2)/s) was 3 orders of magnitude lower than that of water (10(-5) cm(2)/s). This is attributed to the fact that CuB relied on the wiggling motion of the block copolymers to diffuse while water molecules diffused via a hopping mechanism. The rates at which CuB and water diffused into PEO-b-PCL were twice those in PEO-b-3PCL because the chain mobility and the degree of swelling are higher and there are fewer intermolecular hydrogen bonds in the case of PEO-b-PCL. The velocity autocorrelation functions of CuB show that the free volume holes formed by PEO-b-3PCL are more rigid than those formed by PEO-b-PCL, making CuB exhibit higher-frequency collision motion in PEO-b-3PCL than in PEO-b-PCL, and the difference in frequency is insensitive to water concentration.
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Affiliation(s)
- Negin Razavilar
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, Canada T6G 2V4
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PEG-PLGA copolymers: their structure and structure-influenced drug delivery applications. J Control Release 2014; 183:77-86. [PMID: 24675377 DOI: 10.1016/j.jconrel.2014.03.026] [Citation(s) in RCA: 216] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/13/2014] [Accepted: 03/15/2014] [Indexed: 01/04/2023]
Abstract
In the paper, we begin by describing polyethylene glycol-poly lactic acid-co-glycolic acid (PEG-PLGA) which was chosen as a typical model copolymer for the construction of nano-sized drug delivery systems and also the types of PEG-PLGA copolymers that were eluted. Following this we examine the structure-influenced drug delivery applications including nanoparticles, micelles and hydrogels. After that, the preparation methods for nano-sized delivery systems are presented. In addition, the drug loading mode of PEG-PLGA micelles is divided into three aspects. Finally, the drug release profiles of PEG-PLGA micelles, both in terms of their in vitro and in vivo characteristics, are represented. PEG-PLGA copolymers are very suitable for the construction of micelles as carriers for insoluble drugs. This article reviews the structure and the different structure-influenced applications of PEG-PLGA copolymers, concentrating on the application of PEG-PLGA micelles.
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Hu X, Li D, Tan H, Pan C, Chen X. Injectable Graphene Oxide/Graphene Composite Supramolecular Hydrogel for Delivery of Anti-Cancer Drugs. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2014. [DOI: 10.1080/10601325.2014.882704] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Khodaverdi E, Tekie FSM, Hadizadeh F, Esmaeel H, Mohajeri SA, Tabassi SAS, Zohuri G. Hydrogels composed of cyclodextrin inclusion complexes with PLGA-PEG-PLGA triblock copolymers as drug delivery systems. AAPS PharmSciTech 2014; 15:177-188. [PMID: 24234803 DOI: 10.1208/s12249-013-0051-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 10/22/2013] [Indexed: 12/12/2022] Open
Abstract
Although conventional pharmaceuticals have many drug dosage forms on the market, the development of new therapeutic molecules and the low efficacy of instant release formulations for the treatment of some chronic diseases and specific conditions encourage scientists to invent different delivery systems. To this purpose, a supramolecular hydrogel consisting of the tri-block copolymer PLGA-PEGPLGA and α-cyclodextrin was fabricated for the first time and characterised in terms of rheological, morphological, and structural properties. Naltrexone hydrochloride and vitamin B12 were loaded, and their release profiles were determined.
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Hydroxyapatite-Based Colloidal Gels Facilitate the Proliferation and Migration of Chondrocytes and the Adhesion of Umbilical Cord Mesenchymal Stem Cells. INTERNATIONAL SCHOLARLY RESEARCH NOTICES 2014; 2014:935689. [PMID: 27382607 PMCID: PMC4897378 DOI: 10.1155/2014/935689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/26/2014] [Accepted: 10/27/2014] [Indexed: 11/23/2022]
Abstract
Collective movement of cells that have been delivered on biomaterials for transplantation purposes would be a desirable attribute that would promote wound healing, cell proliferation, and eventual growth and regeneration of damaged organs. We hypothesized that colloidal gels made from hydroxyapatite (HA) and poly(D,L-lactic-co-glycolic acid) (PLGA) particles will be conducive to the growth and migration of porcine chondrocytes, will allow the adhesion of human umbilical cord mesenchymal stem cells, and will have negligible effects on the cell cycle of these cells. Then, we performed experiments designed to assess the viability and migratory properties of porcine chondrocytes studded on nanosized HA/PLGA particles. Our experiments show that porcine chondrocytes migrated in and around a hydroxyapatite-based biomaterial that could be described as a colloidal gel. Cells in the colloidal gel demonstrated unidirectional movement. Cells were seen to be extending lamellae and were followed by other cells.
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Preparation of a sustained release drug delivery system for dexamethasone by a thermosensitive, in situ forming hydrogel for use in differentiation of dental pulp. ISRN PHARMACEUTICS 2013; 2013:983053. [PMID: 24369509 PMCID: PMC3863485 DOI: 10.1155/2013/983053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 10/28/2013] [Indexed: 12/27/2022]
Abstract
In situ forming delivery systems composed of block copolymers are attracting substantial attention due to their ease of use, biocompatibility, and biodegradability. In this study, the thermoresponsive triblock copolymer PLGA-PEG-PLGA was studied as a dexamethasone delivery system. Dexamethasone, a synthetic glucocorticoid, is used clinically to improve inflammation, pain, and the hyperemesis of chemotherapy, and it is applied experimentally as a differentiation factor in tissue engineering. PLGA-PEG-PLGA was synthesised under microwave irradiation for 5 min. The obtained copolymer was characterised to determine its structure and phase transition temperature. An in vitro release study was conducted for various copolymer structures and drug concentrations. The yield of the reaction and HNMR analysis confirmed the appropriateness of the microwave-assisted method for PLGA-PEG-PLGA synthesis. Phase transition temperature was affected by the drug molecule as well as by the copolymer concentration and structure. An in vitro release study demonstrated that release occurs mainly by diffusion and does not depend on the copolymer structure or dexamethasone concentration.
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Maran A, Dadsetan M, Buenz CM, Shogren KL, Lu L, Yaszemski MJ. Hydrogel-PLGA delivery system prolongs 2-methoxyestradiol-mediated anti-tumor effects in osteosarcoma cells. J Biomed Mater Res A 2013; 101:2491-9. [DOI: 10.1002/jbm.a.34550] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 11/02/2012] [Accepted: 11/13/2012] [Indexed: 11/08/2022]
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Ajazuddin, Alexander A, Khan J, Giri TK, Tripathi DK, Saraf S, Saraf S. Advancement in stimuli triggered in situ gelling delivery for local and systemic route. Expert Opin Drug Deliv 2012; 9:1573-92. [PMID: 23075325 DOI: 10.1517/17425247.2013.734806] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Current research efforts focused on the design and evaluation of drug delivery systems that are easy to administer require decreased administration frequency, and provide sustained drug release in order to increase clinical efficacy and compliance of the patients. The gel forming smart polymeric formulations offer numerous applications resemble sustained and prolonged action in contrast to conventional drug delivery systems. AREAS COVERED Article summarizes type of bioactive, sol-gel triggering factors, dose, rationales, and polymers involved in gelation with respect to their route of administration. A lot of work has been done with smart polymeric gelling system taking the advantage of stimuli (temperature and pH) triggered sol-gel phase-transition in the administered area that have great prospective in biomedical and pharmaceutical applications, particularly in target-specific controlled drug delivery systems. EXPERT OPINION Although the principle of gelation is so attractive, key issues remain to be solved which include (i) variability of the drug release, (ii) avoidance of burst release in case of depot formulation, and (iii) issues related to toxicity. Unfortunately, till now area concerning the detailed processes of the gelling formation is still not much explored. Despite this proclamation, many efforts are made in industry and institutions to improve concerned approaches. New materials and approaches enter the preclinical and clinical phases and one can be sure that this strategy will gain further clinical importance within the next years. Thus, this review article will assuredly serve as an informative tool for the innovators working in the concern area.
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Affiliation(s)
- Ajazuddin
- Rungta College of Pharmaceutical Sciences and Research, C.G., 490024, India
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