1
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Electrosprayed trilayer poly (d,l-lactide-co-glycolide) nanoparticles for the controlled co-delivery of a SGLT2 inhibitor and a thiazide-like diuretic. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2023.104311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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2
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Co-delivery of saxagliptin and dapagliflozin by electrosprayed trilayer poly (D, -lactide-co-glycolide) nanoparticles for controlled drug delivery. Int J Pharm 2022; 628:122279. [DOI: 10.1016/j.ijpharm.2022.122279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/06/2022] [Indexed: 11/18/2022]
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3
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Ünal S, Aktaş Y. Bisphosphonate-loaded PLGA microspheres for bone regeneration in dental surgery: formulation, characterization, stability, and comprehensive release kinetic studies. INT J POLYM MATER PO 2022. [DOI: 10.1080/00914037.2022.2082425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sedat Ünal
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Erciyes University, Kayseri, Turkey
| | - Yeşim Aktaş
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Erciyes University, Kayseri, Turkey
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4
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Li S, Shi X, Xu B, Wang J, Li P, Wang X, Lou J, Li Z, Yang C, Li S, Zhen P. In vitro drug release and antibacterial activity evaluation of silk fibroin coated vancomycin hydrochloride loaded poly (lactic-co-glycolic acid) (PLGA) sustained release microspheres. J Biomater Appl 2022; 36:1676-1688. [PMID: 35015589 DOI: 10.1177/08853282211064098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Currently, the treatment of osteomyelitis poses a great challenge to clinical orthopedics. The use of biodegradable materials combined with antibiotics provides a completely new option for the treatment of osteomyelitis. In this study, vancomycin hydrochloride (VANCO) loaded poly (lactic-co-glycolic acid) (PLGA) microspheres were prepared by a double emulsion solvent evaporation method, and the in vitro drug release behaviors of the drug loaded microspheres were explored after coating with different concentrations of silk fibroin (SF). Drug loading, encapsulation efficiency, Scanning electron microscopy, particle size analysis, Fourier transform infrared spectroscopy, hydrophilicity, in vitro drug release, and in vitro antibacterial activity were evaluated. The results showed that the drug loading of vancomycin loaded PLGA microspheres was (24.11 ±1.72)%, and the encapsulation efficiency was (48.21 ±3.44)%. The in vitro drug release indicated that the drug loaded microspheres showed an obvious initial burst release, and the drug loaded microspheres coated with SF could alleviate the initial burst release in varying degrees. It also can reduce the amount of cumulative drug release, and the effect of microspheres coated with 0.1% concentration of SF is the best. The time of in vitro drug release in different groups of drug loaded microspheres can be up to 28 days. The microspheres coated with (0.1%SF) or without (0%SF) SF showed a cumulative release of (82.50±3.51)% and (67.70±3.81)%,respectively. Therefore, the surface coating with SF of vancomycin loaded microspheres can alleviate the initial burst release, reduce the cumulative drug release, potentially prolong the drug action time, and improve the anti-infection effect.
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Affiliation(s)
- Shengtang Li
- 74713Lanzhou University Second Hospital, Lanzhou, China.,The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
| | - Xuewen Shi
- 105002Ningxia Medical University, Yinchuan, China
| | - Bo Xu
- 74713Lanzhou University Second Hospital, Lanzhou, China.,The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
| | - Jian Wang
- 381940Gansu University of Traditional Chinese Medicine, Lanzhou, China
| | - Peng Li
- 381940Gansu University of Traditional Chinese Medicine, Lanzhou, China
| | - Xin Wang
- 105002Ningxia Medical University, Yinchuan, China
| | - Jinpeng Lou
- 105002Ningxia Medical University, Yinchuan, China
| | - Ziyao Li
- 74713Lanzhou University Second Hospital, Lanzhou, China.,The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
| | - Chengwei Yang
- The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
| | - Songkai Li
- The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
| | - Ping Zhen
- The 940th Hospital of the Joint Logistics Support Force of the People's Liberation Army of China, LanZhou, China
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5
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Systems for local, sustained release of zoledronic acid as a potential treatment for metastatic bone disease. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 118:111395. [DOI: 10.1016/j.msec.2020.111395] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 07/22/2020] [Accepted: 08/17/2020] [Indexed: 01/31/2023]
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6
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Trudicova M, Smilek J, Kalina M, Smilkova M, Adamkova K, Hrubanova K, Krzyzanek V, Sedlacek P. Multiscale Experimental Evaluation of Agarose-Based Semi-Interpenetrating Polymer Network Hydrogels as Materials with Tunable Rheological and Transport Performance. Polymers (Basel) 2020; 12:E2561. [PMID: 33142862 PMCID: PMC7693122 DOI: 10.3390/polym12112561] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 01/29/2023] Open
Abstract
This study introduces an original concept in the development of hydrogel materials for controlled release of charged organic compounds based on semi-interpenetrating polymer networks composed by an inert gel-forming polymer component and interpenetrating linear polyelectrolyte with specific binding affinity towards the carried active compound. As it is experimentally illustrated on the prototype hydrogels prepared from agarose interpenetrated by poly(styrene sulfonate) (PSS) and alginate (ALG), respectively, the main benefit brought by this concept is represented by the ability to tune the mechanical and transport performance of the material independently via manipulating the relative content of the two structural components. A unique analytical methodology is proposed to provide complex insight into composition-structure-performance relationships in the hydrogel material combining methods of analysis on the macroscopic scale, but also in the specific microcosms of the gel network. Rheological analysis has confirmed that the complex modulus of the gels can be adjusted in a wide range by the gelling component (agarose) with negligible effect of the interpenetrating component (PSS or ALG). On the other hand, the content of PSS as low as 0.01 wt.% of the gel resulted in a more than 10-fold decrease of diffusivity of model-charged organic solute (Rhodamine 6G).
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Affiliation(s)
- Monika Trudicova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (M.T.); (J.S.); (M.K.); (M.S.)
| | - Jiri Smilek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (M.T.); (J.S.); (M.K.); (M.S.)
| | - Michal Kalina
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (M.T.); (J.S.); (M.K.); (M.S.)
| | - Marcela Smilkova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (M.T.); (J.S.); (M.K.); (M.S.)
| | - Katerina Adamkova
- Institute of Scientific Instruments of the Czech Academy of Sciences, Kralovopolska 147, 61264 Brno, Czech Republic; (K.A.); (K.H.); (V.K.)
| | - Kamila Hrubanova
- Institute of Scientific Instruments of the Czech Academy of Sciences, Kralovopolska 147, 61264 Brno, Czech Republic; (K.A.); (K.H.); (V.K.)
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, Kralovopolska 147, 61264 Brno, Czech Republic; (K.A.); (K.H.); (V.K.)
| | - Petr Sedlacek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (M.T.); (J.S.); (M.K.); (M.S.)
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7
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Matrali SSH, Ghag AK. Feedback-Controlled Release of Alendronate from Composite Microparticles. J Funct Biomater 2020; 11:jfb11030046. [PMID: 32630317 PMCID: PMC7564771 DOI: 10.3390/jfb11030046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/07/2020] [Accepted: 06/15/2020] [Indexed: 12/17/2022] Open
Abstract
Extended bone fractures or fractures coexisting with bone disorders can lead to non-unions where surgical intervention is required. Composite drug delivery systems are being used increasingly more in order to treat such defects locally. Alendronate (ALD), a bisphosphonate extensively used in clinical practice to treat conditions, such as osteoporosis, has been shown to assist bone fracture healing through its antiresorptive capacity. This study reports the development of a polymeric composite system for the in situ delivery of ALD, which possesses enhanced encapsulation efficiency (EE%) and demonstrates controlled release over a 70-day period. ALD and calcium phosphate (CaP) were incorporated within poly (lactic-co-glycolic acid) (PLGA) microspheres, giving rise to a 70% increase in EE% compared to a control system. Finally, a preliminary toxicological evaluation demonstrated a positive effect of the system on pre-osteoblastic cells over 72 h.
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8
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Di Francesco M, Primavera R, Summa M, Pannuzzo M, Di Francesco V, Di Mascolo D, Bertorelli R, Decuzzi P. Engineering shape-defined PLGA microPlates for the sustained release of anti-inflammatory molecules. J Control Release 2020; 319:201-212. [DOI: 10.1016/j.jconrel.2019.12.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 12/18/2019] [Accepted: 12/20/2019] [Indexed: 10/25/2022]
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9
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Comparison of the properties of implantable matrices prepared from degradable and non-degradable polymers for bisphosphonate delivery. Int J Pharm 2017; 533:364-372. [DOI: 10.1016/j.ijpharm.2017.07.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 06/06/2017] [Accepted: 07/08/2017] [Indexed: 12/12/2022]
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10
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Aderibigbe B, Aderibigbe I, Popoola P. Design and Biological Evaluation of Delivery Systems Containing Bisphosphonates. Pharmaceutics 2016; 9:E2. [PMID: 28035945 PMCID: PMC5374368 DOI: 10.3390/pharmaceutics9010002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 11/24/2016] [Accepted: 11/30/2016] [Indexed: 02/06/2023] Open
Abstract
Bisphosphonates have found application in the treatment of reoccurrence of bone diseases, breast cancer, etc. They have also been found to exhibit antimicrobial, anticancer and antimalarial activities. However, they suffer from pharmacological deficiencies such as toxicity, poor bioavailability and low intestinal adsorption. These shortcomings have resulted in several researchers developing delivery systems that can enhance their overall therapeutic effectiveness. This review provides a detailed overview of the published studies on delivery systems designed for the delivery of bisphosphonates and the corresponding in vitro/in vivo results.
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Affiliation(s)
- Blessing Aderibigbe
- Department of Chemistry, University of Fort Hare, Alice Campus, Eastern Cape 5700, South Africa.
| | - Isiaka Aderibigbe
- Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Pretoria 0001, South Africa.
| | - Patricia Popoola
- Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Pretoria 0001, South Africa.
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11
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Kaur M, Singh S, Mehta R. A comparison of modifications induced by Li3+ and Ag8+ ion beams irradiation in poly(lactide-co-glycolide) films. POLYMER SCIENCE SERIES B 2016. [DOI: 10.1134/s1560090416060105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Oz UC, Devrim B, Bozkır A, Canefe K. Development of reconstitutable suspensions containing diclofenac sodium-loaded microspheres for pediatric delivery. J Microencapsul 2015; 32:317-28. [DOI: 10.3109/02652048.2015.1017616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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13
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Shivinsky A, Bronshtein T, Haber T, Machluf M. The effect of AZD2171- or sTRAIL/Apo2L-loaded polylactic-co-glycolic acid microspheres on a subcutaneous glioblastoma model. Biomed Microdevices 2015; 17:69. [DOI: 10.1007/s10544-015-9969-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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14
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Wu J, Zuo Y, Hu Y, Wang J, Li J, Qiao B, Jiang D. Development and in vitro characterization of drug delivery system of rifapentine for osteoarticular tuberculosis. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:1359-66. [PMID: 25834394 PMCID: PMC4357616 DOI: 10.2147/dddt.s78407] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The study was to develop and evaluate the rifapentine-loaded poly(lactic acid-co-glycolic acid) (PLGA) microspheres (RPMs) for the treatment of osteoarticular tuberculosis to avoid critical side effects caused by oral regimens of antibiotics or intravenous antibiotics. The RPMs were spherical with rough surfaces, and elevated amounts of rifapentine in the formulation markedly increased the particle size and drug loading, while decreased the size distribution and entrapment efficiency. The highest drug loading and encapsulation efficiency of RPMs were 23.93%±3.93% and 88.49%±8.49%, respectively. After the initial rapid drug release, the release rate gradually decreased, and approximately 80% of the encapsulated rifapentine was released after 30 days of incubation. Moreover, RPMs could effectively inhibit the growth of Staphylococcus aureus. With increasing rifapentine content, the inhibition zones were continuously enlarged while the minimal inhibitory concentration values decreased. These results suggested that RPMs were bioactive and controlled release delivery systems for the treatment of osteoarticular tuberculosis.
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Affiliation(s)
- Jun Wu
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Yi Zuo
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Yunjiu Hu
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Jian Wang
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Jidong Li
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Bo Qiao
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Dianming Jiang
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
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15
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Izadifar M, Haddadi A, Chen X, Kelly ME. Rate-programming of nano-particulate delivery systems for smart bioactive scaffolds in tissue engineering. NANOTECHNOLOGY 2015; 26:012001. [PMID: 25474543 DOI: 10.1088/0957-4484/26/1/012001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Development of smart bioactive scaffolds is of importance in tissue engineering, where cell proliferation, differentiation and migration within scaffolds can be regulated by the interactions between cells and scaffold through the use of growth factors (GFs) and extra cellular matrix peptides. One challenge in this area is to spatiotemporally control the dose, sequence and profile of release of GFs so as to regulate cellular fates during tissue regeneration. This challenge would be addressed by rate-programming of nano-particulate delivery systems, where the release of GFs via polymeric nanoparticles is controlled by means of the methods of, such as externally-controlled and physicochemically/architecturally-modulated so as to mimic the profile of physiological GFs. Identifying and understanding such factors as the desired release profiles, mechanisms of release, physicochemical characteristics of polymeric nanoparticles, and externally-triggering stimuli are essential for designing and optimizing such delivery systems. This review surveys the recent studies on the desired release profiles of GFs in various tissue engineering applications, elucidates the major release mechanisms and critical factors affecting release profiles, and overviews the role played by the mathematical models for optimizing nano-particulate delivery systems. Potentials of stimuli responsive nanoparticles for spatiotemporal control of GF release are also presented, along with the recent advances in strategies for spatiotemporal control of GF delivery within tissue engineered scaffolds. The recommendation for the future studies to overcome challenges for developing sophisticated particulate delivery systems in tissue engineering is discussed prior to the presentation of conclusions drawn from this paper.
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Affiliation(s)
- Mohammad Izadifar
- Division of Biomedical Engineering, College of Engineering, 57 Campus Drive, University of Saskatchewan, Saskatoon, SK, S7N5A9, Canada
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Pistone A, Iannazzo D, Panseri S, Montesi M, Tampieri A, Galvagno S. Hydroxyapatite-magnetite-MWCNT nanocomposite as a biocompatible multifunctional drug delivery system for bone tissue engineering. NANOTECHNOLOGY 2014; 25:425701. [PMID: 25265364 DOI: 10.1088/0957-4484/25/42/425701] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
New magnetic hydroxyapatite-based nanomaterials as bone-specific systems for controlled drug delivery have been synthesized. The synthesized hydroxyapatite, HA, decorated with magnetite nanoparticles by a deposition method (HA/Fe3O4) and the nanocomposite system obtained using magnetic multi-walled carbon nanotubes (HA/MWCNT/Fe3O4) as a filler for HA have been characterized by chemical and morphological analyses, and their biological behavior was investigated. The systems have also been doped with clodronate in order to combine the effect of bone biomineralization induced by hydroxyapatite-based composites with the decrease of osteoclast formation induced by the drug. An analysis of the preosteoclastic RAW264.7 cell proliferation by MTT assay confirmed the high biocompatibility of the three systems. TRAP staining of RAW 264.7 conditioned with sRAKL to induce osteoclastogenesis, cultured in the presence of the systems doped and undoped with clodronate, showed the inhibitory effect of clodronate after we counted the MNC TRAP(+)cells but only in the osteoclast formation; in particular, the system HA/Fe3O4-Clo exerted a high inhibitory effect compared to the drug alone. These results demonstrate that the synthesized nanocomposites are a biocompatible magnetic drug delivery system and can represent a useful multimodal platform for applications in bone tissue engineering.
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Affiliation(s)
- Alessandro Pistone
- Department of Electronic Engineering, Industrial Chemistry and Engineering, University of Messina, Contrada di Dio, 98166, Messina, Italy
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de Arce Velasquez A, Ferreira LM, Stangarlin MFL, da Silva CDB, Rolim CMB, Cruz L. Novel Pullulan–Eudragit® S100 blend microparticles for oral delivery of risedronate: Formulation, in vitro evaluation and tableting of blend microparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 38:212-7. [DOI: 10.1016/j.msec.2014.02.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 01/24/2014] [Accepted: 02/04/2014] [Indexed: 01/23/2023]
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18
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Liu H, Venkatraman SS. Solid/Hollow Depots for Drug Delivery, Part 1: Effect of Drug Characteristics and Polymer Molecular Weight on the Phase-Inversion Dynamics, Depot Morphology, and Drug Release. J Pharm Sci 2014; 103:485-95. [DOI: 10.1002/jps.23790] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 10/06/2013] [Accepted: 10/29/2013] [Indexed: 11/06/2022]
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19
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Gainza G, Aguirre JJ, Pedraz JL, Hernández RM, Igartua M. rhEGF-loaded PLGA-Alginate microspheres enhance the healing of full-thickness excisional wounds in diabetised Wistar rats. Eur J Pharm Sci 2013; 50:243-52. [DOI: 10.1016/j.ejps.2013.07.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/14/2013] [Accepted: 07/05/2013] [Indexed: 01/13/2023]
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20
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Biomedical applications of bisphosphonates. J Control Release 2013; 167:175-88. [PMID: 23395668 DOI: 10.1016/j.jconrel.2013.01.032] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 12/24/2012] [Accepted: 01/30/2013] [Indexed: 02/08/2023]
Abstract
Since their discovery over 100 years ago, bisphosphonates have been used industrially as corrosion inhibitors and complexing agents. With the discovery of their pharmacological activity in the late 1960s, implicating their high affinity for hydroxyapatite, bisphosphonates have been employed in the treatment of bone diseases and as targeting agents for colloids and drugs. They have notably been investigated for the treatment of Paget's disease, osteoporosis, bone metastases, malignancy-associated hypercalcemia, and pediatric bone diseases. Currently, they are first-line medications for several of these diseases and are taken by millions of patients worldwide, mostly postmenopausal women. A major problem associated with their use is their low oral bioavailability. Several delivery systems have been proposed to improve their absorption and to direct them to sites other than bone tissues. Beyond their important pharmacological role, the medical applications of bisphosphonates are numerous. In addition, their metal-chelating properties have been exploited to coat and stabilize implants, nanoparticulates, and contrast agents. In this contribution, we review the pharmacological and clinical uses of bisphosphonates and highlight their novel applications in the pharmaceutical and biomedical fields.
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Miladi K, Sfar S, Fessi H, Elaissari A. Drug carriers in osteoporosis: preparation, drug encapsulation and applications. Int J Pharm 2013; 445:181-95. [PMID: 23376227 DOI: 10.1016/j.ijpharm.2013.01.031] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 12/10/2012] [Accepted: 01/16/2013] [Indexed: 01/23/2023]
Abstract
Carriers are largely used to enhance therapy efficiency via the encapsulation of active molecules. The encapsulation enhances the stability of drug molecules, improves the targeting properties and prolongs pharmacological activity via continuous local release of active molecules. The aim of this review is to report the carrier systems used in osteoporosis therapy. This state of the art research has mainly focused on describing all types of carriers used in this area, their elaboration and properties, the drug characteristics used in such specific application, and drug release and efficiency. In this field, various processes have been used in order to obtain well-defined capsules, spheres and more complex carriers. In this exhaustive review, each process is described, illustrated and discussed.
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Affiliation(s)
- K Miladi
- University of Lyon, F-69622, Lyon, France
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Cattalini JP, Boccaccini AR, Lucangioli S, Mouriño V. Bisphosphonate-based strategies for bone tissue engineering and orthopedic implants. TISSUE ENGINEERING. PART B, REVIEWS 2012; 18:323-40. [PMID: 22440082 PMCID: PMC3458621 DOI: 10.1089/ten.teb.2011.0737] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2011] [Accepted: 03/20/2012] [Indexed: 01/24/2023]
Abstract
Bisphosphonates (BPs) are a group of well-established drugs that are applied in the development of metabolic bone disorder-related therapies. There is increasing interest also in the application of BPs in the context of bone tissue engineering, which is the topic of this review, in which an extensive overview of published studies on the development and applications of BPs-based strategies for bone regeneration is provided with special focus on the rationale for the use of different BPs in three-dimensional (3D) bone tissue scaffolds. The different alternatives that are investigated to address the delivery and sustained release of these therapeutic drugs in the nearby tissues are comprehensively discussed, and the most significant published approaches on bisphosphonate-conjugated drugs in multifunctional 3D scaffolds as well as the role of BPs within coatings for the improved fixation of orthopedic implants are presented and critically evaluated. Finally, the authors' views regarding the remaining challenges in the fields and directions for future research efforts are highlighted.
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Affiliation(s)
- Juan Pablo Cattalini
- Department of Pharmaceutical Technology, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Aldo R. Boccaccini
- Department of Materials Science and Engineering, Institute of Biomaterials, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Silvia Lucangioli
- National Science Research Council (CONICET), Buenos Aires, Argentina
- Department of Pharmaceutical Technology, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Viviana Mouriño
- National Science Research Council (CONICET), Buenos Aires, Argentina
- Department of Pharmaceutical Technology, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
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23
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Ahmed TA, Ibrahim HM, Ibrahim F, Samy AM, Kaseem A, H. Nutan MT, Hussain MD. Development of biodegradable in situ implant and microparticle injectable formulations for sustained delivery of haloperidol. J Pharm Sci 2012; 101:3753-62. [DOI: 10.1002/jps.23250] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 05/29/2012] [Accepted: 06/11/2012] [Indexed: 11/09/2022]
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Lim JH, You SK, Baek JS, Hwang CJ, Na YG, Shin SC, Cho CW. Surface-modified gemcitabine with mucoadhesive polymer for oral delivery†. J Microencapsul 2012; 29:487-96. [DOI: 10.3109/02652048.2012.665086] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Preparation and characterization of a novel pH-sensitive coated microsphere for duodenum-specific drug delivery. Arch Pharm Res 2012; 35:839-50. [DOI: 10.1007/s12272-012-0509-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/22/2010] [Accepted: 01/31/2011] [Indexed: 12/21/2022]
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Lim JH, You SK, Baek JS, Hwang CJ, Na YG, Shin SC, Cho CW. Preparation and evaluation of polymeric microparticulates for improving cellular uptake of gemcitabine. Int J Nanomedicine 2012; 7:2307-14. [PMID: 22661887 PMCID: PMC3357977 DOI: 10.2147/ijn.s30465] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Gemcitabine must be administered at high doses to elicit the required therapeutic response because of its very short plasma half-life due to rapid metabolism. These high doses can have severe adverse effects. METHODS In this study, polymeric microparticulate systems of gemcitabine were prepared using chitosan as a mucoadhesive polymer and Eudragit L100-55 as an enteric copolymer. The physicochemical and biopharmaceutical properties of the resulting systems were then evaluated. RESULTS There was no endothermic peak for gemcitabine in any of the polymeric gemcitabine microparticulate systems, suggesting that gemcitabine was bound to chitosan and Eudragit L100-55 and its crystallinity was changed into an amorphous form. The polymeric gemcitabine microparticulate system showed more than 80% release of gemcitabine in 30 minutes in simulated intestinal fluid. When mucin particles were incubated with gemcitabine polymeric microparticulates, the zeta potential of the mucin particles was increased to 1.57 mV, indicating that the polymeric gemcitabine microparticulates were attached to the mucin particles. Furthermore, the F53 polymeric gemcitabine microparticulates having 150 mg of chitosan showed a 3.8-fold increased uptake of gemcitabine into Caco-2 cells over 72 hours compared with gemcitabine solution alone. CONCLUSION Overall, these results suggest that polymeric gemcitabine microparticulate systems could be used as carriers to help oral absorption of gemcitabine.
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Affiliation(s)
- Ji-Ho Lim
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, Gungdong, Yuseonggu, Daejeon, South Korea
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Mondal T, M.C.Sunny, D.Khastgir, H.K.Varma, Ramesh P. Poly (l-lactide-co-Є caprolactone) microspheres laden with bioactive glass-ceramic and alendronate sodium as bone regenerative scaffolds. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012. [DOI: 10.1016/j.msec.2012.01.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Rhee YS, Sohn M, Woo BH, Thanoo BC, DeLuca PP, Mansour HM. Sustained-release delivery of octreotide from biodegradable polymeric microspheres. AAPS PharmSciTech 2011; 12:1293-301. [PMID: 21948321 DOI: 10.1208/s12249-011-9693-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 09/12/2011] [Indexed: 11/30/2022] Open
Abstract
The study reports on the drug release behavior of a potent synthetic somatostatin analogue, octreotide acetate, from biocompatible and biodegradable microspheres composed of poly-lactic-co-glycolic acid (PLGA) following a single intramuscular depot injection. The serum octreotide levels of three Oakwood Laboratories formulations and one Sandostatin LAR(®) formulation were compared. Three formulations of octreotide acetate-loaded PLGA microspheres were prepared by a solvent extraction and evaporation procedure using PLGA polymers with different molecular weights. The in vivo drug release study was conducted in male Sprague-Dawley rats. Blood samples were taken at predetermined time points for up to 70 days. Drug serum concentrations were quantified using a radioimmunoassay procedure consisting of radiolabeled octreotide. The three octreotide PLGA microsphere formulations and Sandostatin LAR(®) all showed a two-phase drug release profile (i.e., bimodal). The peak serum drug concentration of octreotide was reached in 30 min for all formulations followed by a decline after 6 h. Following this initial burst and decline, a second-release phase occurred after 3 days. This second-release phase exhibited sustained-release behavior, as the drug serum levels were discernible between days 7 and 42. Using pharmacokinetic computer simulations, it was estimated that the steady-state octreotide serum drug levels would be predicted to fall in the range of 40-130 pg/10 μL and 20-100 pg/10 μL following repeat dosing of the Oakwood formulations and Sandostatin LAR(®) every 28 days and every 42 days at a dose of 3 mg/rat, respectively.
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Nasr M, Awad GA, Mansour S, Taha I, Shamy AA, Mortada ND. Different modalities of NaCl osmogen in biodegradable microspheres for bone deposition of risedronate sodium by alveolar targeting. Eur J Pharm Biopharm 2011; 79:601-11. [DOI: 10.1016/j.ejpb.2011.07.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 07/20/2011] [Accepted: 07/22/2011] [Indexed: 10/17/2022]
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The mechanisms of drug release in poly(lactic-co-glycolic acid)-based drug delivery systems—A review. Int J Pharm 2011; 415:34-52. [DOI: 10.1016/j.ijpharm.2011.05.049] [Citation(s) in RCA: 722] [Impact Index Per Article: 55.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 05/08/2011] [Accepted: 05/09/2011] [Indexed: 01/07/2023]
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Optimized electro- and wet-spinning techniques for the production of polymeric fibrous scaffolds loaded with bisphosphonate and hydroxyapatite. J Tissue Eng Regen Med 2011; 5:253-63. [DOI: 10.1002/term.310] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nasr M, Awad GA, Mansour S, Al Shamy A, Mortada ND. A Reliable Predictive Factorial Model for Entrapment Optimization of a Sodium Bisphosphonate into Biodegradable Microspheres. J Pharm Sci 2011; 100:612-21. [DOI: 10.1002/jps.22297] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 05/02/2010] [Accepted: 06/21/2010] [Indexed: 11/09/2022]
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Baek JS, Kwon HH, Hwang JS, Sung HC, Lee JM, Shin SC, Kim YR, Cho CW. Alendronate-loaded microparticles for improvement of intestinal cellular absorption. J Drug Target 2010; 19:37-48. [PMID: 20477555 DOI: 10.3109/10611861003667599] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study examined a novel alendronate formulation that was developed to overcome the shortcomings of alendronate, such as its low bioavailability and gastric adverse effects. Alendronate microparticles were prepared using mucoadhesive polymers such as chitosan for improving the intestinal cellular absorption of alendronate and also using a gastric-resistant polymer such as Eudragit L100-55 for reducing the gastric inflammation of alendronate. Alendronate microparticles including chitosan showed a threefold increase in alendronate uptake (6.92 ± 0.27%) in Caco-2 cells when compared with the uptake of alendronate solution (2.38 ± 0.27%) into Caco-2 cells. Most interestingly, alendronate microparticles including chitosan showed 2.80 x 10⁻⁶ cm/s of an apparent permeability coefficient across Caco-2 cells and caused a significant 42.4% enhancement compared with that of alendronate solution across Caco-2 cells. The morphology of the Caco-2 cells treated with alendronate microparticles including chitosan was similar to that of the untreated cells and alendronate microparticles exhibited a negative effect to propodium iodide with some annexin-V fluorescence isothiocyante positive effect. It was proposed that the novel alendronate microparticles could possess the potential of an increased intestinal absorption and fewer adverse effects of alendronate.
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Affiliation(s)
- Jong-Suep Baek
- College of Pharmacy and Institute of Drug Research & Development, Chungnam National University, 220 Gungdong, Yuseonggu, Daejeon 305-764, South Korea
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Cruz L, Assumpção E, Andrade SF, Conrado DJ, Guterres SS, Pohlmann AR. Microencapsulation of sodium alendronate reduces drug mucosal damage in rats. Drug Deliv 2010; 17:231-7. [DOI: 10.3109/10717541003667830] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mahboubian A, Hashemein SK, Moghadam S, Atyabi F, Dinarvand R. Preparation and In-vitro Evaluation of Controlled Release PLGA Microparticles Containing Triptoreline. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2010; 9:369-78. [PMID: 24381601 PMCID: PMC3870060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Triptoreline is a potent agonist of luteinizing hormone-releasing hormone, currently used in the treatment of prostatic cancer where therapy may be required over months or years. Frequent injection of drug decreases patients' compliance. The present study describes the formulation of a sustained release microparticulate drug delivery system containing triptoreline acetate, using poly (D,L lactide-co-glycolide) (PLGA). Biodegradable microspheres were prepared using 50 : 50 PLGA by a water in-oil-in-water (w/o/w) double emulsion-solvent evaporation procedure and characterized for drug content and drug release rate using the a HPLC method, particle size distribution using the laser diffraction method, and surface morphology using scanning electron microscopy and drug release rate. Effect of critical process parameters and formulation variables; i.e. volume of inner water phase, addition of NaCl to the outer aqueous phase (W2), addition of different types and amounts of emulsifying agents on microsphere characteristics; were investigated. Microspheres prepared were spherical with a smooth surface, but addition of poloxamer to the first emulsion produced microspheres with large pores. Size of microparticles was dependent on the type, as well as the amount of co-encapsulated surfactants. Increasing the inner water phase volume resulted in larger particles with a lower encapsulation efficiency. Low concentrations of Span 20 decreased triptoreline release rate, whereas the addition of poloxamer or high concentrations of Span 20 increased the drug release rateit. In conclusion, by selecting an appropriate level of the investigated parameters, spherical microparticles with encapsulation efficiencies higher than 90% and a prolonged triptoreline release over 45 days were obtained.
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Affiliation(s)
- Alireza Mahboubian
- Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
| | | | - Shadi Moghadam
- Medical Nanotechnology Research Centre, Tehran University of Medical Sciences, Tehran, Iran.
| | - Fatemeh Atyabi
- Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran., Medical Nanotechnology Research Centre, Tehran University of Medical Sciences, Tehran, Iran.
| | - Rassoul Dinarvand
- Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran., Medical Nanotechnology Research Centre, Tehran University of Medical Sciences, Tehran, Iran.,Corresponding author: E-mail:
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Labouta HI, El-Khordagui LK, Molokhia AM, Ghaly GM. Multivariate modeling of encapsulation and release of an ionizable drug from polymer microspheres. J Pharm Sci 2009; 98:4603-15. [DOI: 10.1002/jps.21753] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Samdancioglu S, Calis S, Sumnu M, Atilla Hincal A. Formulation and In Vitro Evaluation of Bisphosphonate Loaded Microspheres for Implantation in Osteolysis. Drug Dev Ind Pharm 2008; 32:473-81. [PMID: 16638686 DOI: 10.1080/03639040500528871] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Chitosan and poly(lactide-co-glycolide) acid (PLGA) microspheres loaded with alendronate sodium (AS) were prepared for orthopedic as well as dental applications. In orthopedics the aim was to make the total joint prostheses stay in the body for a long time without causing bone tissue loss, while in dentistry it was aimed to treat the alveolar bone resorption caused by periodontitis and also to make the dental treatment using implants easier by reducing the bone loss in patients with osteoporosis. Solvent evaporation method was used to prepare AS loaded PLGA microspheres and emulsion polimerization method was used to prepare AS loaded chitosan microspheres. Particle size, loading efficacy, surface characteristics, and in vitro release characteristics were examined on prepared formulations. After the examination of the scanning electron microscopy photographs of microspheres, chitosan microspheres were observed to have spherical structure and smooth surface characteristics while PLGA microspheres were observed to have spherical porous surface structure. Loading efficacy was found to be 3.30% for chitosan microspheres and 7.70% for PLGA microspheres. It was observed that 85% of AS had been released at the end of the third day from chitosan microspheres whereas 58% was released at the end of the fifth day from PLGA microspheres. It was found that chitosan microspheres gave first order release while PLGA microspheres gave zero order release.
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Affiliation(s)
- Sibel Samdancioglu
- Hacettepe University, Department of Pharmaceutical Technology, Faculty of Pharmacy, Sihhiye 06100, Ankara, Turkey
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Investigation into the role of tumor-associated macrophages in the antitumor activity of Doxil. Pharm Res 2008; 25:1948-55. [PMID: 18523874 PMCID: PMC2469273 DOI: 10.1007/s11095-008-9629-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2008] [Accepted: 05/08/2008] [Indexed: 11/02/2022]
Abstract
PURPOSE Our recent studies show specific localization of long-circulating liposomes (LCL) within the endosomal/lysosomal compartment of tumor-associated macrophages (TAM). Based on this finding, the present study aims to investigate whether clinically applied LCL formulations such as Doxil (LCL-encapsulated doxorubicin), have alternative mechanisms of action additionally to direct drug-mediated cytotoxicity towards tumor cells. METHODS The antitumor activity of Doxil was evaluated in B16.F10 melanoma-bearing mice, in the presence and in the absence of TAM. To suppress TAM functions, liposomal clodronate (Lip-CLOD) was injected 24 h before the actual treatment. The effect of Doxil on the levels of angiogenic factors was determined using an angiogenic protein array. As positive control, the same experiments were conducted with LCL-encapsulated prednisolone phosphate (LCL-PLP), a tumor-targeted formulation with known strong anti-angiogenic/anti-inflammatory effects on TAM. RESULTS Our results show that the antitumor efficacy of Doxil was only partially attributed to the inhibition of TAM-mediated angiogenesis whereas LCL-PLP inhibited tumor growth through strong suppressive effects on pro-angiogenic functions of TAM. As described previously, the main mechanism of Doxil might be a cytotoxic effect on tumor cells. CONCLUSIONS Our findings suggest that the antitumor activity of Doxil does not depend mainly on the presence of functional TAM in tumors.
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Antitumor activity of liposomal prednisolone phosphate depends on the presence of functional tumor-associated macrophages in tumor tissue. Neoplasia 2008; 10:108-17. [PMID: 18283332 DOI: 10.1593/neo.07913] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2007] [Revised: 11/15/2007] [Accepted: 11/15/2007] [Indexed: 02/06/2023] Open
Abstract
Prednisolone phosphate (PLP) encapsulated in long-circulating liposomes (LCLs) (LCL-PLP) exerts antitumor activity through the inhibition of tumor angiogenesis. It is known that tumor-associated macrophages (TAMs) play a crucial role in tumor growth as they are actively involved in promoting and maintaining tumor angiogenesis. To gain more insight into the antiangiogenic mechanisms of LCL-PLP, this study aimed to investigate the role of TAM in the antitumor mode of action of LCL-PLP in B16.F10 melanoma-bearing mice. Our results show that TAMs have a pivotal function in the growth of B16.F10 melanoma through the production of pro-angiogenic/pro-inflammatory factors. One of the major inhibitory actions of LCL-PLP on tumor growth is the reduction of the TAM-mediated production of pro-angiogenic factors, whereas production of anti-angiogenic factors by these cells is hardly affected.
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Nafea EH, El-Massik MA, El-Khordagui LK, Marei MK, Khalafallah NM. Alendronate PLGA microspheres with high loading efficiency for dental applications. J Microencapsul 2008; 24:525-38. [PMID: 17654173 DOI: 10.1080/02652040701439807] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE Alendronate sodium, used systemically as a bone protective agent, proved to also be effective locally in various dental bone applications. Development of alendronate-loaded microspheres with high loading efficiency for such applications would be greatly challenged by the hydrophilicity and low MW of the drug. The aim of this study was to incorporate alendronate sodium, into poly (lactide-co-glycolide) (PLGA) microspheres (MS) with high loading efficiency. METHODS Three multiple emulsion methods: water-in-oil-in-water (W/O/W), water-in-oil-in-oil (W/O(1)/O(2)) and solid-in-oil-in-oil (S/O(1)/O(2)) were tested. In addition to entrapment efficiency, MS were characterized for surface morphology, particle size, in vitro drug release and in vitro degradation of the polymer matrix. Alendronate microspheres with maximum drug loading and good overall in vitro performance were obtained using the W/O(1)/O(2) emulsion technique. RESULTS Drug release from the microspheres exhibited a triphasic release pattern over a period of 13 days, the last fast release phase being associated with more rapid degradation of the PLGA matrix. CONCLUSIONS Biocompatible, biodegradable PLGA microspheres incorporating alendronate sodium with high loading efficiency obtained in this study may offer promise as a delivery system for bisphosphonates in dental and probably other clinical applications.
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Affiliation(s)
- Eman H Nafea
- Faculty of Pharmacy, Department of Pharmaceutics, University of Alexandria, Tissue Engineering Laboratories, Alexandria, Egypt
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Singh D, Saraf S, Dixit VK, Saraf S. Formulation Optimization of Gentamicin Loaded Eudragit RS100 Microspheres Using Factorial Design Study. Biol Pharm Bull 2008; 31:662-7. [DOI: 10.1248/bpb.31.662] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Huolman R, Ashammakhi N. New Multifunctional Anti-Osteolytic Releasing Bioabsorbable Implant. J Craniofac Surg 2007; 18:295-301. [PMID: 17414278 DOI: 10.1097/scs.0b013e31802e2a85] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Bioabsorbable devices are a good alternative to metals for bone fixation because of their temporary presence in the body. However, bioabsorbable implants elicit a local foreign-body reaction that may lead to osteolysis. The aim of the current study was to develop and characterize a bioabsorbable implant with anti-osteolytic properties. Poly(lactide-co-glycolide) (PLGA) 80/20, was compounded with clodronic acid disodium salt (CS) to produce rods that were subsequently self-reinforced (SR) and gamma-sterilized. Four different implant types were investigated: 1) PLGA+CS, 2) SR-PLGA+CS, 3) sterilized (s)SR-PLGA+CS, and 4) sSR-PLGA. Drug release was determined using ultraviolet spectrophotometry. Shear strength, bending strength, and Young's modulus in bending were studied for 12 weeks in vitro, and changes in pH of the solution were also evaluated. A burst drug release was detected at the start. Approximately 70% of the drug was released during 10 weeks from SR rods and only 3% from the compounded rods during 12 weeks. gamma-sterilization also accelerated drug release. During the first 6 weeks, CS releasing rods had lower initial mechanical properties than plain rods, whereas they had higher values at 12 weeks because of the more steady and linear strength loss of CS rods. The pH of plain rods leads to a fall in pH at 8 to 12 weeks. A very slight drop in pH was seen with CS rods. In conclusion, it is feasible to develop clodronate-releasing, bioabsorbable PLGA implants that have acceptable mechanical properties. Rods retained suitable mechanical properties for fixation for 6 weeks in vitro. CS rods also prevent a drop in pH in vitro. In vivo studies are needed to evaluate their functionality with the view of clinical application in future.
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Affiliation(s)
- Riikka Huolman
- Institute of Biomaterials, Tampere University of Technology, Tampere, Finland
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Seshima H, Yoshinari M, Takemoto S, Hattori M, Kawada E, Inoue T, Oda Y. Control of bisphosphonate release using hydroxyapatite granules. J Biomed Mater Res B Appl Biomater 2006; 78:215-21. [PMID: 16544308 DOI: 10.1002/jbm.b.30446] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The efficacy of hydroxyapatite (HAp) as a carrier was investigated to establish a method of local administration of bisphosphonates (Bps), which has currently been administered systemically. HAp granules (300-500 microm in size) with different physicochemical features were prepared by altering the sintering temperature. To ascertain the physicochemical properties of the HAp granules, their crystallinity was assessed using X-ray diffraction, the surface morphology was examined under scanning electron microscopy, and the specific surface area and calcium dissolution were evaluated. Different Bps-HAp composites were subsequently prepared and the concentration of Bps released from these composites was measured. The influence of Bps-HAp composites on the rate of osteoclast survival was also evaluated. The results revealed that (1) HAp solubility depends on the sintering temperature; (2) The concentration of released Bps could be controlled by regulating the sintering temperature of HAp as a carrier; and (3) Bps released from Bps-HAp composites reduced the number of osteoclasts. These findings indicated that Bps-HAp composites could be locally administered as a drug delivery system to areas with bone resorption.
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Affiliation(s)
- Hisashi Seshima
- Department of Dental Materials Science, Oral Health Science Center, Tokyo Dental College, 1-2-2 Masago, Chiba 261-8502, Japan
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Ha CS, Gardella JA. Surface Chemistry of Biodegradable Polymers for Drug Delivery Systems. Chem Rev 2005; 105:4205-32. [PMID: 16277374 DOI: 10.1021/cr040419y] [Citation(s) in RCA: 158] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chang-Sik Ha
- Department of Polymer Science and Engineering, Pusan National University, Pusan 609-735, Korea
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Synthesis of sol–gel silica materials providing a slow release of biphosphonate. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2004.11.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wang L, Chaw CS, Yang YY, Moochhala SM, Zhao B, Ng S, Heller J. Preparation, characterization, and in vitro evaluation of physostigmine-loaded poly(ortho ester) and poly(ortho ester)/poly(D,L-lactide-co-glycolide) blend microspheres fabricated by spray drying. Biomaterials 2004; 25:3275-82. [PMID: 14980422 DOI: 10.1016/j.biomaterials.2003.09.099] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2003] [Accepted: 09/22/2003] [Indexed: 11/29/2022]
Abstract
The physostigmine-loaded poly(ortho ester) (POE), poly(dl-lactide-co-glycolide) (PLGA) and POE/PLGA blend microspheres were fabricated by a spray drying technique. The in vitro degradation of, and physostigmine release from, the microspheres were investigated. SEM analysis showed that the POE and POE/PLGA blend particles were spherical. They were better dispersed when compared to the pure PLGA microspheres. Two glass transition temperature ( Tg ) values of the POE/PLGA blend microspheres were observed due to the phase separation of POE and PLGA in the blend system. XPS analysis proved that POE dominated the surfaces of POE/PLGA blend microspheres, indicating that the blend microspheres were coated with POE. The encapsulation efficiencies of all the microspheres were more than 95%. The incorporation of physostigmine reduced the Tg value of microspheres. The Tg value of the degrading microspheres increased with the release of physostigmine. For instance, POE blank microspheres and physostigmine-loaded POE microspheres had a Tg value of 67 degrees C and 48 degrees C, respectively. After 19 days in vitro incubation, Tg of the degrading POE microspheres increased to 55 degrees C. Weight loss studies showed that the degradation of the blend microspheres was accelerated with the presence of PLGA because its degradation products catalyzed the degradation of both POE and PLGA. The release rate of physostigmine increased with increase of PLGA content in the blend microspheres. The initial burst release of physostigmine was effectively suppressed by introducing POE to the blend microspheres. However, there was an optimized weight ratio of POE to PLGA (85:15 in weight), below which a high initial burst was induced. The POE/PLGA blend microspheres may make a good drug delivery system.
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Affiliation(s)
- Ling Wang
- Institute of Materials Research and Engineering, National University of Singapore, No. 3 Research Link, Singapore 117602, Singapore
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Peltonen L, Aitta J, Hyvönen S, Karjalainen M, Hirvonen J. Improved entrapment efficiency of hydrophilic drug substance during nanoprecipitation of poly(l)lactide nanoparticles. AAPS PharmSciTech 2004; 5:E16. [PMID: 15198537 PMCID: PMC2784850 DOI: 10.1208/pt050116] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2004] [Accepted: 02/11/2004] [Indexed: 11/30/2022] Open
Abstract
The purpose of this research was to improve the entrapment efficiency of a model hydrophilic drug substance, sodium cromoglycate, loaded inside polylactic acid nanoparticles by a modified nanoprecipitation method. The effect of formulation parameters was studied to improve the entrapment efficiency of the drug substance inside the nanoparticles. Several parameters (changes in the amount of model drug, solvent selection, electrolyte addition, pH alteration) were tested in order to increase the loading of the hydrophilic drug in the hydrophobic nanoparticles. Lowering of the pH was the most efficient way to increase the drug loading; up to approximately 70% of the sodium cromoglycate used in the particle formation process could be loaded inside the particles. The loading efficiency without the pH change was around 10% to 15% at maximum. The crystallinity values and crystal habits of the sodium cromoglycate nanoparticles were studied (x-ray diffraction) before and after the lowering of the pH. The change in pH conditions during the nanoprecipitation process did not affect markedly the crystallinity properties of the drug substance. According to this study, it is possible to improve the entrapment efficiency of hydrophilic sodium cromoglycate inside of the nanoparticles by small changes in the process parameters without alterations in the physical properties of the original drug substance.
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Affiliation(s)
- Leena Peltonen
- Division of Pharmaceutical Technology and Viikki Drug Discovery Technology Center (DDTC), Faculty of Pharmacy, PO Box 56, FIN-00014 University of Helsinki, Finland.
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Improved entrapment efficiency of hydrophilic drug substance during nanoprecipitation of poly(I)lactide nanoparticles. AAPS PharmSciTech 2004. [DOI: 10.1007/bf02830584] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Peltonen L, Koistinen P, Karjalainen M, Häkkinen A, Hirvonen J. The effect of cosolvents on the formulation of nanoparticles from low-molecular-weight poly(l)lactide. AAPS PharmSciTech 2002; 3:E32. [PMID: 12916926 PMCID: PMC2751340 DOI: 10.1208/pt030432] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2002] [Accepted: 11/07/2002] [Indexed: 11/30/2022] Open
Abstract
The aim of this study was to formulate nanoparticles from poly(l)lactide by a modified nanoprecipitation method. The main focus was to study the effect of cosolvent selection on the shape, size, formation efficiency, degree of crystallinity, x-ray diffraction (XRD) reflection pattern, and zeta potential value of the particles. Low-molecular-weight (2000 g/mol) poly(l)lactide was used as a polymer, and sodium cromoglycate was used as a drug. Acetone, ethanol, and methanol were selected as cosolvents. Optimal nanoparticles were achieved with ethanol as a cosolvent, and the formation efficiency of the particles was also higher with ethanol as compared with acetone or methanol. The particles formulated by ethanol and acetone appeared round and smooth, while with methanol they were slightly angular. When the volume of the inner phase was decreased during the nanoprecipitation process, the mean particle size was also decreased with all the solvents, but the particles were more prone to aggregate. The XRD reflection pattern and the degree of crystallinity were more dependent on the amount of the solvents in the inner phase than on the properties of the individual cosolvents. The zeta potential values of all the particle batches were slightly negative, which partially explains the increased tendency toward particle aggregation.
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Affiliation(s)
- Leena Peltonen
- Pharmaceutical Technology Division and Viikki Drug Discovery Technology Center, Department of Pharmacy, University of Helsinki, Helsinki, Finland.
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