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Daneshvar A, Farokhi M, Bonakdar S, Vossoughi M. Synthesis and characterization of injectable thermosensitive hydrogel based on Pluronic-grafted silk fibroin copolymer containing hydroxyapatite nanoparticles as potential for bone tissue engineering. Int J Biol Macromol 2024; 277:134412. [PMID: 39097043 DOI: 10.1016/j.ijbiomac.2024.134412] [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: 04/04/2024] [Revised: 07/09/2024] [Accepted: 07/31/2024] [Indexed: 08/05/2024]
Abstract
Injectable hydrogels are promising for bone tissue engineering due to their minimally invasive application and adaptability to irregular defects. This study presents the development of pluronic grafted silk fibroin (PF-127-g-SF), a temperature-sensitive graft copolymer synthesized from SF and modified PF-127 via a carbodiimide coupling reaction. The PF-127-g-SF copolymer exhibited a higher sol-gel transition temperature (34 °C at 16 % w/v) compared to PF-127 (23 °C), making it suitable for injectable applications. It also showed improved flexibility and strength, with a yielding point increase from <10 % to nearly 30 %. Unlike PF-127 gel, which degrades within 72 h in aqueous media, the PF-127-g-SF copolymer maintained a stable gel structure for over two weeks due to its robust crosslinked hydrogel network. Incorporating hydroxyapatite nanoparticles (n-HA) into the hydrogel reduced pore size and decreased swelling and degradation rates, extending structural stability to four weeks. Increasing n-HA concentration from 0 % to 20 % reduced porosity from 80 % to 66 %. Rheological studies indicated that n-HA enhanced the scaffold's strength and mechanical properties without altering gelation temperature. Cellular studies with MG-63 cells showed that n-HA concentration influenced cell viability and mineralization, highlighting the scaffold's potential in bone tissue engineering.
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Affiliation(s)
- Anahita Daneshvar
- Center for Nanoscience and Nanotechnology, Institute for Convergence Science & Technology, Sharif University of Technology, Tehran 14588-89694, Iran
| | - Mehdi Farokhi
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran.
| | - Shahin Bonakdar
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran
| | - Manouchehr Vossoughi
- Center for Nanoscience and Nanotechnology, Institute for Convergence Science & Technology, Sharif University of Technology, Tehran 14588-89694, Iran; Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
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2
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Soto-Arriaza M, Cena Ahumada E, Bonardd S, Melendez J. Calcein release from DPPC liposomes by phospholipase A2 activity: Effect of cholesterol and amphipathic copolymers. J Liposome Res 2024:1-13. [PMID: 38850012 DOI: 10.1080/08982104.2024.2361610] [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: 08/02/2023] [Accepted: 05/25/2024] [Indexed: 06/09/2024]
Abstract
In this study, we evaluated the impact of incorporating diblock and triblock amphiphilic copolymers, as well as cholesterol into DPPC liposomes on the release of a model molecule, calcein, mediated by exogenous phospholipase A2 activity. Our findings show that calcein release slows down in the presence of copolymers at low concentration, while at high concentration, the calcein release profile resembles that of the DPPC control. Additionally, calcein release mediated by exogenous PLA2 decreases as the amount of solubilized cholesterol increases, with a maximum between 18 mol% and 20 mol%. At concentrations higher than 24 mol%, no calcein release was observed. Studies conducted on HEK-293 and HeLa cells revealed that DPPC liposomes reduced viability by only 5% and 12%, respectively, after 3 hours of incubation, while DPPC liposome in presence of 33 mol% of Cholesterol reduced viability by approximately 11% and 23%, respectively, during the same incubation period. For formulations containing copolymers at low and high concentrations, cell viability decreased by approximately 20% and 40%, respectively, after 3 hours of incubation. Based on these preliminary results, we can conclude that the presence of amphiphilic copolymers at low concentration can be used in the design of new DPPC liposomes, and together with cholesterol, they can modulate liposome stabilization. The new formulations showed low cytotoxicity in HEK-293 cells, and it was observed that calcein release depended entirely on PLA2 activity and the presence of calcium ions.
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Affiliation(s)
- Marco Soto-Arriaza
- Escuela de Química y Farmacia, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Eduardo Cena Ahumada
- Instituto de Bioquímica y Microbiología, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Sebastián Bonardd
- Centro de Física de Materiales (CSIC, UPV/EHU)-Materials Physics Center (MPC), Donostia-San Sebastían, Spain
- Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, University of the Basque Country UPV/EHU, Donostia-San Sebastian, Spain
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Arafa WM, Elkomy MH, Aboud HM, Ali MI, Abdel Gawad SS, Aboelhadid SM, Mahdi EA, Alsalahat I, Abdel-Tawab H. Tunable Polymeric Mixed Micellar Nanoassemblies of Lutrol F127/Gelucire 44/14 for Oral Delivery of Praziquantel: A Promising Nanovector against Hymenolepis nana in Experimentally-Infected Rats. Pharmaceutics 2022; 14:pharmaceutics14102023. [PMID: 36297459 PMCID: PMC9608995 DOI: 10.3390/pharmaceutics14102023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/17/2022] [Accepted: 09/19/2022] [Indexed: 11/29/2022] Open
Abstract
Hymenolepiasis represents a parasitic infection of common prevalence in pediatrics with intimidating impacts, particularly amongst immunocompromised patients. The present work aimed to snowball the curative outcomes of the current mainstay of hymenolepiasis chemotherapy, praziquantel (PRZ), through assembly of polymeric mixed micelles (PMMs). Such innovative nano-cargo could consolidate PRZ hydrosolubility, extend its circulation time and eventually upraise its bioavailability, thus accomplishing a nanoparadigm for hymenolepiasis tackling at lower dose levels. For consummating this goal, PRZ-PMMs were tailored via thin-film hydration technique integrating a binary system of Lutrol F127 and Gelucire 44/14. Box-Behnken design was planned for optimizing the nanoformulation variables employing Design-Expert® software. Also, in Hymenolepis nana-infected rats, the pharmacodynamics of the optimal micellar formulation versus the analogous crude PRZ suspension were scrutinized on the 1st and 3rd days after administration of a single oral dose (12.5 or 25 mg/kg). Moreover, in vitro ovicidal activity of the monitored formulations was estimated utilizing Fuchsin vital stain. Furthermore, the in vivo pharmacokinetics were assessed in rats. The optimum PRZ-PMMs disclosed conciliation between thermodynamic and kinetic stability, high entrapment efficiency (86.29%), spherical nanosized morphology (15.18 nm), and controlled-release characteristics over 24 h (78.22%). 1H NMR studies verified PRZ assimilation within the micellar core. Additionally, the in vivo results highlighted a significant boosted efficacy of PRZ-PMMs manifested by fecal eggs output and worm burden reduction, which was clearly evident at the lesser PRZ dose, besides a reversed effect for the intestinal histological disruptions. At 50 µg/mL, PRZ-PMMs increased the percent of non-viable eggs to 100% versus 47% for crude PRZ, whilst shell destruction and loss of embryo were only clear with the applied nano-cargo. Moreover, superior bioavailability by 3.43-fold with elongated residence time was measured for PRZ-PMMs compared to PRZ suspension. Practically, our results unravel the potential of PRZ-PMMs as an oral promising tolerable lower dose nanoplatform for more competent PRZ mass chemotherapy.
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Affiliation(s)
- Waleed M. Arafa
- Department of Parasitology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Mohammed H. Elkomy
- Department of Pharmaceutics, College of Pharmacy, Jouf University, Sakaka 72341, Saudi Arabia
- Correspondence: (M.H.E.); (I.A.)
| | - Heba M. Aboud
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Mona Ibrahim Ali
- Department of Medical Parasitology, Faculty of Medicine, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Samah S. Abdel Gawad
- Department of Medical Parasitology, Faculty of Medicine, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Shawky M. Aboelhadid
- Department of Parasitology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Emad A. Mahdi
- Department of Pathology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Izzeddin Alsalahat
- UK Dementia Research Institute Cardiff, School of Medicine, Cardiff University, Cardiff CF24 1TP, UK
- Correspondence: (M.H.E.); (I.A.)
| | - Heba Abdel-Tawab
- Department of Zoology, Faculty of Science, Beni-Suef University, Beni-Suef 62521, Egypt
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Kim J, Francis DM, Sestito LF, Archer PA, Manspeaker MP, O'Melia MJ, Thomas SN. Thermosensitive hydrogel releasing nitric oxide donor and anti-CTLA-4 micelles for anti-tumor immunotherapy. Nat Commun 2022; 13:1479. [PMID: 35304456 PMCID: PMC8933465 DOI: 10.1038/s41467-022-29121-x] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 02/23/2022] [Indexed: 01/01/2023] Open
Abstract
Due to their autosynchronous roles in shaping the anti-tumor immune response, complex immune regulatory networks acting both locally within the tumor microenvironment as well as in its draining lymph nodes play critical roles in the cancer immunotherapy response. We describe herein a thermosensitive co-polymer hydrogel system formed from biocompatible polymers gelatin and Pluronic® F127 that are widely used in humans to enable the sustained release of a nitric oxide donor and antibody blocking immune checkpoint cytotoxic T-lymphocyte-associated protein-4 for efficient and durable anti-tumor immunotherapy. By virtue of its unique gel formation and degradation properties that sustain drug retention at the tumor tissue site for triggered release by the tumor microenvironment and formation of in situ micelles optimum in size for lymphatic uptake, this rationally designed thermosensitive hydrogel facilitates modulation of two orthogonal immune signaling networks relevant to the regulation of the anti-tumor immune response to improve local and abscopal effects of cancer immunotherapy.
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Affiliation(s)
- Jihoon Kim
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA.,George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA
| | - David M Francis
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA
| | - Lauren F Sestito
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 313 Ferst Dr NW, Atlanta, GA, 30332, USA.,Wallace H. Coulter Department of Biomedical Engineering, Emory University, 201 Dowman Drive, Atlanta, GA, 30322, USA
| | - Paul A Archer
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA
| | - Margaret P Manspeaker
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA
| | - Meghan J O'Melia
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 313 Ferst Dr NW, Atlanta, GA, 30332, USA.,Wallace H. Coulter Department of Biomedical Engineering, Emory University, 201 Dowman Drive, Atlanta, GA, 30322, USA
| | - Susan N Thomas
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA. .,George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 315 Ferst Dr NW, Atlanta, GA, 30332, USA. .,Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 313 Ferst Dr NW, Atlanta, GA, 30332, USA. .,Wallace H. Coulter Department of Biomedical Engineering, Emory University, 201 Dowman Drive, Atlanta, GA, 30322, USA. .,Winship Cancer Institute, Emory University School of Medicine, 1365-C Clifton Road NE, Atlanta, GA, 30322, USA.
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Marcos X, Méndez-Luna D, Fragoso-Vázquez M, Rosales-Hernández M, Correa-Basurto J. Anti-breast cancer activity of novel compounds loaded in polymeric mixed micelles: Characterization and in vitro studies. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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PF-127 based vildagliptin loaded polymeric hydrogels prepared by aqueous polymerization technique for treatment of diabetes mellitus. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02747-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Trivedi S, Thool S, Wadher K, Bhalekar M, Bire P. Self-Assembling Dioscorea bulbifera loaded mixed micelles: Formulation optimization, in-vitro cytotoxicity and in-vivo pharmacokinetics. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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8
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Zhao S, Chen F, Zhu X, Liu W, Wu C, Zhang J, Ren S, Yan Z, Cao W, Zhang Q, Li X. An azine-based polymer derived hierarchically porous N-doped carbon for hydrophilic dyes removal. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125299. [PMID: 33930941 DOI: 10.1016/j.jhazmat.2021.125299] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/28/2021] [Accepted: 01/30/2021] [Indexed: 06/12/2023]
Abstract
In this study, a novel hierarchically porous N-doped carbon (HPNC) material was successfully prepared by soft-templating method. The commercial triblock copolymer of Pluronic F127 and a polyazine derived from hydrazine hydrate & glyoxal were used as soft template and precursor, respectively. The obtained materials were fully characterized and tested as a sorbent for the removal of hydrophilic dyes of Methylene blue (MB), Basic Fuchsin (BF), Eosin Y (EY) and Rhodamine B (RB) from their aqueous effluents. According to the characterization results, the synthesized material of HPNC-1000 presented thick fibrous morphology with micron size in diameter, hierarchically porous structure with surface area of 1853 m2/g, pore volume of 1.59 cm3/g and nitrogen content of 4.5 wt%. Adsorption-desorption investigation reveals that synergistic effect of hydrophobic interaction and hydrogen-bonding formation of the dye molecules with the sorbent was most pronounced in the adsorptions. The maximum adsorption capacities for MB, BF, EY and RB reached 0.83, 0.92, 1.23 and 1.83 mmol g-1, respectively. The adsorption processes well fitted by the pseudo first-order kinetic model and the Liu's isotherm. The sorbent can be regenerated by above 90% of the initial adsorption efficiency after six regeneration cycles.
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Affiliation(s)
- Songlin Zhao
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Fushan Chen
- Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang University, Jiujiang 332005, Jiangxi, China
| | - Xiandi Zhu
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Weijun Liu
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Chenlin Wu
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Jie Zhang
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Shibin Ren
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Zhengzhong Yan
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Wenli Cao
- Department of Chemistry, School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, Zhejiang, China
| | - Qunfeng Zhang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.
| | - Xiaonian Li
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
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9
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Sotoudegan F, Sotoudegan F, Talebkhan Garoosi Y, Afshar SH, Barkhordari F, Davami F. Anti-Aβ-scFv-loaded polymeric nano-micelles with enhanced plasma stability. J Pharm Pharmacol 2021; 73:460-472. [PMID: 33793837 DOI: 10.1093/jpp/rgaa068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 12/23/2020] [Indexed: 01/03/2023]
Abstract
OBJECTIVES Immunotherapy using recombinant monoclonal antibodies specifically Anti-amyloid-beta (Anti-Aβ) scFv is envisaged as an appropriate therapeutic for Alzheimer through reduction of amyloid-beta aggregation. The solubilization of therapeutics using polymeric micelles facilitates an improved bioavailability and extended blood half-life. In this study, the optimum production condition for Anti-amyloid-beta (Anti-Aβ) scFv was obtained. To increase the stability of plasma, Anti-Aβ-loaded polymeric micelles were synthesized. METHODS Escherichia coli SHuffle expression strain was used and purified by Ni-NTA. Pluronics P85 and F127 micelles were used for the Anti-Aβ delivery and were characterized in terms of morphology, drug loading and drug release in phosphate buffer and artificial cerebrospinal fluid. The stability profile was quantified at 4°C over a 30 days storage period. The stability in human plasma was also evaluated. KEY FINDINGS Proteins expressed in SHuffle resulted in increased levels of protein expression and solubility. Low critical micelle concentration value and high micelle encapsulation efficiency (<200 nm) achieved via direct dissolution method. Anti-Aβ-loaded micelles were around 2.2-fold more stable than Anti-Aβ in plasma solution. A sustained in-vitro release of Anti-Aβ from micelles was observed. CONCLUSIONS Results confirmed that Pluronic-micelles pose benefits as a nano-carrier to increase the stability of Anti-Aβ scFvin in the plasma.
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Affiliation(s)
- Farnaz Sotoudegan
- Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Farzaneh Sotoudegan
- Pharmaceutical Quality Assurance Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
| | | | - Sahar H Afshar
- Faculty of Pharmacy International Campus, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Fatemeh Davami
- Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
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Cameron MD, Joly K, Breed GA, Mulder CPH, Kielland K. Pronounced Fidelity and Selection for Average Conditions of Calving Area Suggestive of Spatial Memory in a Highly Migratory Ungulate. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2020.564567] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A distinguishing characteristic of many migratory animals is their annual return to distinct calving (birthing) areas in the spring, yet the navigational mechanisms employed during migration that result in this pattern are poorly understood. Effective conservation of these species requires reliable delineation of such areas, quantifying the factors that influence their selection, and understanding the underlying mechanisms resulting in use of calving areas. We used barren-ground caribou (Rangifer tarandus granti) as a study species and identified calving sites of the Western Arctic Herd in Alaska using GPS collar data from 2010–2017. We assessed variability in calving areas by comparing spatial delineations across all combinations of years. To understand calving area selection at a landscape scale, we performed a resource selection analysis comparing calving sites to available locations across the herd’s range and incorporated time-varying, remotely sensed metrics of vegetation quality and quantity. We found that whereas calving areas varied from year to year, this annual variation was centered on an area of recurring attraction consistent with previous studies covering the last six decades. Calving sites were characterized by high-quality forage at the average time of calving, but not peak calving that year, and by a narrow range of distinct physiographic factors. Each year, calving sites were located on areas of above-average conditions based on our predictive model. Our findings indicate that the pattern of spring migration for pregnant females was to migrate to areas that consistently provide high-quality forage when averaged across years, and then upon arriving at this calving ground, refine selection using their perception of annually varying conditions that are driven by environmental stochasticity. We suggest that the well-documented and widespread pattern of fidelity to calving grounds by caribou is supportive of a navigational mechanism based on spatial memory at a broad scale to optimize foraging and energy acquisition at a critical life-history stage. The extent to which migrants depend on memory to reach their spring destinations has implications for the adaptability of populations to changing climate and human impacts.
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Tejada G, Barrera MG, García P, Sortino M, Lamas MC, Lassalle V, Alvarez V, Leonardi D. Nanoparticulated Systems Based on Natural Polymers Loaded with Miconazole Nitrate and Lidocaine for the Treatment of Topical Candidiasis. AAPS PharmSciTech 2020; 21:278. [PMID: 33033939 DOI: 10.1208/s12249-020-01826-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 09/22/2020] [Indexed: 12/17/2022] Open
Abstract
People with weakened immune systems are at risk of developing candidiasis which is a fungal infection caused by several species of Candida genus. In this work, polymeric nanoparticles containing miconazole nitrate and the anesthetic lidocaine clorhydrate were developed. Miconazole was chosen as a typical drug to treat buccopharyngeal candidiasis whereas lidocaine may be useful in the management of the pain burning, and pruritus caused by the infection. Nanoparticles were synthesized using chitosan and gelatin at different ratios ranging from 10:90 to 90:10. The nano-systems presented nanometric size (between 80 and 300 nm in water; with polydispersion index ranging from 0.120 to 0.596), and positive Z potential (between 20.11 and 37.12 mV). The determined encapsulation efficiency ranges from 65 to 99% or 34 to 91% for miconazole nitrate and lidocaine clorhydrate, respectively. X-ray diffraction and DSC analysis suggested that both drugs were in amorphous state in the nanoparticles. Finally, the systems fitted best the Korsmeyer-Peppas model showing that the release from the nanoparticles was through diffusion allowing a sustained release of both drugs and prolonged the activity of miconazole nitrate over time against Candida albicans for at least 24 h.
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Ghosh R, Dey J. pH-Responsive Vesicle Formation by PEGylated Cholesterol Derivatives: Physicochemical Characterization, Stability, Encapsulation, and Release Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5829-5838. [PMID: 32388987 DOI: 10.1021/acs.langmuir.0c00562] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
PEGylated vesicles are known to serve as blood-persistent drug-delivery systems (DDSs) with potential applications in intravenous drug administration. pH-responsive PEGylated vesicles are also among the most promising stimuli-responsive carriers for drug delivery and controlled release for cancer chemotherapy. Herein, we report design and synthesis of two novel pH-responsive amphiphiles by coupling a cholesterol (Chol) and poly(ethylene glycol) chain with l-cysteine amino acid through hydrolysable linkages. The objective of this work is to physicochemically characterize the nanoaggregates of the amphiphiles under different experimental conditions. We have demonstrated spontaneous vesicle formation by the amphiphiles in water using various spectroscopic, calorimetric, and microscopic techniques. The size of vesicles was observed to increase on reduction of solution pH and increase in amphiphile concentration. The vesicles were found to be sufficiently stable under physiological conditions and were shown to be able to encapsulate not only hydrophilic dyes in their aqueous core but also hydrophobic guest molecules in the bilayer membrane constituted by the Chol units. These nanosized vesicles exhibit pH-triggered release of encapsulated dye molecules in acidic pH. Thus, these spontaneously formed stable vesicles might hold potential as biocompatible DDSs in cancer chemotherapy.
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Affiliation(s)
- Rita Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Joykrishna Dey
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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13
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Flandez K, Bonardd S, Soto-Arriaza M. Physicochemical properties of L-alpha dipalmitoyl phosphatidylcholine large unilamellar vesicles: Effect of hydrophobic block (PLA/PCL) of amphipathic diblock copolymers. Chem Phys Lipids 2020; 230:104927. [PMID: 32454007 DOI: 10.1016/j.chemphyslip.2020.104927] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 04/27/2020] [Accepted: 05/09/2020] [Indexed: 10/24/2022]
Abstract
In the present work, we show how amphipathic diblock copolymers affect the physicochemical properties of the lipid bilayer of DPPC liposome. Diblock copolymers proposed for this study are focused in the difference between PLA and PCL hydrophobic block, because PLA and PCL differ in their glass transition temperature, where a higher ratio of PLA, lowers the flexibility of the diblock copolymer. On the contrary, a greater proportion of PCL makes the diblock copolymer more flexible. This flexibility difference between hydrophobic block would affect the physicochemical properties of lipid bilayer of DPPC. The difference of rigidity or flexibility of hydrophobic block and their interaction with DPPC large unilamellar vesicles (LUVs) was evaluated at low and high copolymers concentration. The copolymer concentrations used were chosen based on their respective cmc. We measure (a) Thermotropic behavior from GP of Laurdan and fluorescence anisotropy of DPH; (b) Relation between wavelength excitation and generalized polarization of Laurdan; (c) Time-resolved fluorescence anisotropy of DPH; (d) Water outflow through the lipid bilayer and (e) calcein release from DPPC LUVs. Furthermore, large unilamellar vesicles in the absence and in the presence of different copolymers were characterized by size and zeta-potential. The results show that the diblock copolymer at high PLA/PCL ratio, that is, greater rigidity of hydrophobic block produces an increase of the phase transition temperature (Tm). For DPPC LUVs, Tm increase 3.5 °C at low and about 4.5 °C at high copolymers concentration, sensed by Laurdan and DPH fluorescent probes, although the DPPC/copolymers molar ratio for Cop4 is higher than Cop3, Cop2 and Cop1. In addition, we observed a decrease in the polarity of microenvironments in the bilayer and an increase in the order of the acyl chains in the bilayer to a high proportion of PLA. Furthermore, the presence of diblock copolymer with high proportion of PLA, decreases water outflow from DPPC liposome and water efflux is slower; leading to a decrease in calcein release from DPPC liposomes. Our results clearly show that the greater the stiffness of the hydrophobic block, greater degree of packaging of the lipid bilayer, greater the order of the acyl chains, and greater retention of water and calcein inside the liposome. Therefore, the presence of AB-type diblock copolymers with a more rigid hydrophobic block, stabilizes the lipid bilayer and would allow a more controlled release of water, and encapsulated molecules inside of the DPPC liposome.
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Affiliation(s)
- Karina Flandez
- Laboratorio de Biocoloides y Biointerfaces, Departamento de Química-Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Sebastian Bonardd
- Facultad de Ciencias, Centro de Nanotecnología Aplicada, Universidad Mayor, Camino la Pirámide 5750, 8580745, Santiago, Chile
| | - Marco Soto-Arriaza
- Laboratorio de Biocoloides y Biointerfaces, Departamento de Química-Física, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile; Centro de Investigación en Nanotecnología y Materiales Avanzados CIEN-UC, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, C.P. 7820436 Santiago, Chile.
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14
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Kondiah PJ, Kondiah PPD, Choonara YE, Marimuthu T, Pillay V. A 3D Bioprinted Pseudo-Bone Drug Delivery Scaffold for Bone Tissue Engineering. Pharmaceutics 2020; 12:E166. [PMID: 32079221 PMCID: PMC7076403 DOI: 10.3390/pharmaceutics12020166] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 01/27/2020] [Accepted: 02/06/2020] [Indexed: 12/16/2022] Open
Abstract
A 3D bioprinted pseudo-bone drug delivery scaffold was fabricated to display matrix strength, matrix resilience, as well as porous morphology of healthy human bone. Computer-aided design (CAD) software was employed for developing the 3D bioprinted scaffold. Further optimization of the scaffold was undertaken using MATLAB® software and artificial neural networks (ANN). Polymers employed for formulating the 3D scaffold comprised of polypropylene fumarate (PPF), free radical polymerized polyethylene glycol- polycaprolactone (PEG-PCL-PEG), and pluronic (PF127). Simvastatin was incorporated into the 3D bioprinted scaffolds to further promote bone healing and repair properties. The 3D bioprinted scaffold was characterized for its chemical, morphological, mechanical, and in vitro release kinetics for evaluation of its behavior for application as an implantable scaffold at the site of bone fracture. The ANN-optimized 3D bioprinted scaffold displayed significant properties as a controlled release platform, demonstrating drug release over 20 days. The 3D bioprinted scaffold further displayed formation as a pseudo-bone matrix, using a human clavicle bone model, induced with a butterfly fracture. The strength of the pseudo-bone matrix, evaluated for its matrix hardness (MH) and matrix resilience (MR), was evaluated to be as strong as original bone, having a 99% MH and 98% MR property, to healthy human clavicle bones.
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Affiliation(s)
| | | | | | | | - Viness Pillay
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown 2193, South Africa; (P.J.K.); (P.P.D.K.); (Y.E.C.); (T.M.)
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15
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da Rosa CG, Sganzerla WG, de Oliveira Brisola Maciel MV, de Melo APZ, da Rosa Almeida A, Ramos Nunes M, Bertoldi FC, Manique Barreto PL. Development of poly (ethylene oxide) bioactive nanocomposite films functionalized with zein nanoparticles. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124268] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Dubey P, Barker SA, Craig DQM. Design and Characterization of Cyclosporine A-Loaded Nanofibers for Enhanced Drug Dissolution. ACS OMEGA 2020; 5:1003-1013. [PMID: 31984256 PMCID: PMC6977102 DOI: 10.1021/acsomega.9b02616] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Despite widespread use as an immunosuppressant, the therapeutic efficacy of the undecapeptide cyclosporine A (CyA) is compromised when given by the oral route because of the innate hydrophobicity of the drug molecule, potentially leading to poor aqueous solubility and bioavailability. The aim of this study was to develop and characterize nanofibers based on the water-miscible polymer polyvinylpyrrolidone (PVP), incorporating CyA preloaded into polymeric surfactants so as to promote micelle formation on hydration; therefore, this approach represents the novel combination of three dissolution enhancement methodologies, namely solid dispersion technology, micellar systems, and nanofibers with enhanced surface area. The preparation of the nanofibers was performed in two steps. First, mixed micelles composed of the water-soluble vitamin E derivative d-α-tocopheryl poly(ethylene glycol) 1000 succinate and the amphiphilic triblock polymer Pluronic F127 (Poloxamer 407) were prepared. The micelles were characterized in terms of size, surface charge, drug loading, and encapsulation efficiency using transmission electron microscopy, dynamic light scattering, Fourier-transform infrared spectroscopy, high-performance liquid chromatography, and scanning electron and atomic force microscopy analysis. Nanofibers composed of PVP and the drug-loaded surfactant system were then prepared via electrospinning, with accompanying thermal, spectroscopic, and surface topological analysis. Dissolution studies indicated an extremely rapid dissolution profile for the fibers compared to the drug alone, while wettability studies also indicated a marked decrease in contact angle compared to the drug alone. Overall, the new approach appears to offer a viable means for considerably improving the dissolution of the hydrophobic peptide CyA, with associated implications for improved oral bioavailability.
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17
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de Oliveira RSS, Marín Huachaca NS, Lemos M, Santos NF, Feitosa E, Salay LC. Molecular interactions between Pluronic F127 and saponin in aqueous solution. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-019-04552-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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18
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Xu D, Xu T, Gao G, Xiao Y, Wang Z, Chen J, Zhou Y, Wang R, Yin J, Fu J. Effect of solvent-matrix interactions on structures and mechanical properties of micelle-crosslinked gels. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/polb.24805] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Dan Xu
- School of Materials Science and Engineering; Shanghai University, 99 Shangda Road; Shanghai 200444 China
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Ting Xu
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Guorong Gao
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Ying Xiao
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Zongbao Wang
- School of Materials Science and Engineering; Ningbo University, 18 Fenghua Road; Ningbo 315201 China
| | - Jing Chen
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Yang Zhou
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Rong Wang
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
| | - Jingbo Yin
- School of Materials Science and Engineering; Shanghai University, 99 Shangda Road; Shanghai 200444 China
| | - Jun Fu
- Polymers and Composites Division; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road; Ningbo 315201 China
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19
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Li Z, Huang Y, Peng S, Chen X, Zou L, Liu W, Liu C. Liposomes consisting of pluronic F127 and phospholipid: Effect of matrix on morphology, stability and curcumin delivery. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2018.1562353] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Ziling Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
- School of Life Science, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi, PR China
| | - Yousheng Huang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
- Jiangxi Institute of Analysis and Test, Nanchang, Jiangxi, PR China
| | - Shengfeng Peng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
| | - Xing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
| | - Liqiang Zou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
| | - Wei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
| | - Chengmei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, PR China
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20
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Dias ARM, Miranda BNMD, Cobas-Gomez H, Poço JGR, Rubio MRG, Oliveira AMD. Synthesis and characterization of amphiphilic block copolymers by transesterification for nanoparticle production. POLIMEROS 2019. [DOI: 10.1590/0104-1428.02918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Marcos X, Padilla-Beltrán C, Bernad-Bernad MJ, Rosales-Hernández MC, Pérez-Casas S, Correa-Basurto J. Controlled release of N-(2-hydroxyphenyl)-2-propylpentanamide nanoencapsulated in polymeric micelles of P123 and F127 tested as anti-proliferative agents in MDA-MB-231 cells. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2018.10.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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22
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Rodrigues RO, Baldi G, Doumett S, Garcia-Hevia L, Gallo J, Bañobre-López M, Dražić G, Calhelha RC, Ferreira IC, Lima R, Gomes HT, Silva AM. Multifunctional graphene-based magnetic nanocarriers for combined hyperthermia and dual stimuli-responsive drug delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 93:206-217. [DOI: 10.1016/j.msec.2018.07.060] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 07/05/2018] [Accepted: 07/23/2018] [Indexed: 11/16/2022]
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23
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Simon SM, Chandran A, George G, Sajna MS, Valparambil P, Kumi-Barmiah E, Jose G, Biju PR, Joseph C, Unnikrishnan NV. Development of Thick Superhydrophilic TiO 2-ZrO 2 Transparent Coatings Realized through the Inclusion of Poly(methyl methacrylate) and Pluronic-F127. ACS OMEGA 2018; 3:14924-14932. [PMID: 31458158 PMCID: PMC6643965 DOI: 10.1021/acsomega.8b01940] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 10/19/2018] [Indexed: 06/10/2023]
Abstract
A thick coating of hierarchically porous double-templated TiO2-ZrO2-PMMA-PF127 with excellent self-cleaning properties and high transmittance has been developed for the first time on glass substrates using a simple dip-coating technique. Comparative studies of this sample with a thick and transparent coating of single-templated TiO2-ZrO2-PMMA have been performed to probe the origin of its exceptional properties. The formation of the composites, successful incorporation of the polymer into the matrix, and the porous nature of the films have been studied. The presence of Ti2+ in the double-templated samples has been confirmed, which suggest the chemisorption of water on the surface of the film. The variation in the self-cleaning properties of the samples on UV-illumination has also been studied. The double-templated film is found to possess the capability of good hydrophilic retention even 2 days after UV-irradiation.
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Affiliation(s)
- Sanu M. Simon
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - Anoop Chandran
- Department
of Physics, St. Cyril’s College, Adoor 691 529, Kerala, India
| | - Gejo George
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - M. S. Sajna
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - Prakashan Valparambil
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - Eric Kumi-Barmiah
- School
of Chemical and Process Engineering, University
of Leeds, Leeds LS2 9JT, U.K.
| | - Gin Jose
- School
of Chemical and Process Engineering, University
of Leeds, Leeds LS2 9JT, U.K.
| | - P. R. Biju
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - Cyriac Joseph
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
| | - N. V. Unnikrishnan
- School
of Pure & Applied Physics, Mahatma Gandhi
University, Kottayam 686 560, Kerala, India
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24
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Kuo YC, Chang YH, Rajesh R. Targeted delivery of etoposide, carmustine and doxorubicin to human glioblastoma cells using methoxy poly(ethylene glycol)‑poly(ε‑caprolactone) nanoparticles conjugated with wheat germ agglutinin and folic acid. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 96:114-128. [PMID: 30606517 DOI: 10.1016/j.msec.2018.10.094] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 09/25/2018] [Accepted: 10/30/2018] [Indexed: 11/19/2022]
Abstract
Wheat germ agglutinin (WGA) and folic acid (FA)-grafted methoxy poly(ethylene glycol) (MPEG)‑poly(ε‑caprolactone) (PCL) nanoparticles (WFNPs) were applied to transport anticancer drugs across the blood-brain barrier and treat glioblastoma multiforme (GBM). PCL was copolymerized with MPEG, and MPEG-PCL NPs were stabilized with pluronic F127 using a microemulsion-solvent evaporation technique and crosslinked with WGA and FA. The targeting ability of WFNPs loaded with etoposide (ETO), carmustine (BCNU) and doxorubicin (DOX) was investigated via the binding affinity of drug-loaded NP formulations to N‑acetylglucosamine expressed in human brain microvascular endothelial cells and to folate receptor in malignant U87MG cells. We found that a shorter PCL chain in drug-loaded MPEG-PCL NPs yielded a smaller average size of the particles. An increase in PCL chain length (stronger hydrophobicity) enhanced drug entrapment efficiencies in MPEG-PCL NPs, and reduced drug-releasing rates from NP formulations. In addition, anti-proliferative activity against U87MG cells for the 3 drugs followed the order of WFNPs > FA-grafted NPs > WGA-grafted NPs > MPEG-PCL NPs. Immunofluorescence staining revealed that the ligands of drug-loaded WFNPs connected to N‑acetylglucosamine and folate receptor with the help of surface WGA and FA. WFNPs carrying ETO, BCNU and DOX acted as dual-targeting nanocarriers, and their use can be a promising approach to inhibiting GBM growth in the brain.
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Affiliation(s)
- Yung-Chih Kuo
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62102, Taiwan, Republic of China.
| | - Yu-Hsuan Chang
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62102, Taiwan, Republic of China
| | - Rajendiran Rajesh
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62102, Taiwan, Republic of China
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25
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Li W, Hu Y, Shi L, Zhang X, Xiong L, Zhang W, Ullah I. Electrospinning of Polycaprolactone/Pluronic F127 dissolved in glacial acetic acid: fibrous scaffolds fabrication, characterization and in vitro evaluation. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2018; 29:1155-1167. [PMID: 29455624 DOI: 10.1080/09205063.2018.1439431] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Abstracts The Polycaprolactone (PCL) fibrous scaffolds in nano to micro scale have been considered as excellent templates for cell culture and tissue growth. The hydrophobic nature of the PCL, however, yields low initial cell seeding density, heterogeneous cell spreading and slow cell growth rate. Therefore, in this study the surface hydrophilic fibrous scaffolds were directly fabricated by the electrospinning of PCL solutions with small quantities (0.5-5%) of Pluronic F127 (PEO100-PPO65-PEO100) dissolved in benign solvent of glacial acetic acid. The clear and miscible solutions were achieved by controlling the proper F127 content in the blend solutions. The continuous and smooth fibers with average diameters from 0.71 to 1.43 μm made up the fibrous scaffolds in non-woven mode. Then the water wetting angle of the scaffolds could be adjusted from 126° to 0° by varying F127 content owing to its hydrophilic PEO chains presented on surface the blended fibers. Finally, it was demonstrated that the blended fibrous scaffolds with the F127 content less than 1% exhibited better cell attachment, proliferation and spreading performance than those of pure PCL scaffolds.
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Affiliation(s)
- Wenchao Li
- a State Key Lab of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Yiqiang Hu
- b Department of Orthopaedics , Union Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Lei Shi
- a State Key Lab of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Xianglin Zhang
- a State Key Lab of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Liming Xiong
- b Department of Orthopaedics , Union Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Wancheng Zhang
- a State Key Lab of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan , P. R. China
| | - Ismat Ullah
- a State Key Lab of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan , P. R. China
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26
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Dantas Silva LAS, da Cruz de Jesus RL, Fiuza-Junior RA, Andrade HMC, Rigoli IC, de Assunção RMN, Barichello JM, de Lima RG. Aloe vera gel influence on the micellization behavior of copolymer Pluronic F127: A potential photosensitizer carrier for topical application. J Appl Polym Sci 2018. [DOI: 10.1002/app.46191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | | | | | | | | | | | - José Mario Barichello
- Laboratório de Tecnologia Farmacêutica, CCQFA; Universidade Federal de Pelotas, Campus Capão do Leão S/N; Pelotas 96900-010 Rio Grande do Sul Brazil
| | - Renata Galvão de Lima
- Faculdade de Ciências Integradas do Pontal; Universidade Federal de Uberlândia; Ituiutaba 38304-402 Minas Gerais Brazil
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27
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Kim HA, Lee HJ, Hong JH, Moon HJ, Ko DY, Jeong B. α,ω-Diphenylalanine-End-Capping of PEG-PPG-PEG Polymers Changes the Micelle Morphology and Enhances Stability of the Thermogel. Biomacromolecules 2017; 18:2214-2219. [PMID: 28605182 DOI: 10.1021/acs.biomac.7b00626] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Pluronics F127 (P, PEG-PPG-PEG triblock copolymer) was coupled with diphenylalanine (FF) to prepare FF-end-capped Pluronics (FFPFF). With increasing temperature from 10 to 60 °C, the FFPFF self-assembled to vesicles in water. The unimer-to-vesicle transition accompanies endothermic enthalpy of 53.9 kcal/mol. Aqueous P and FFPFF solutions exhibited thermogelation in 15.0-24.0 wt %. The gel phase of FFPFF was stable up to 90 °C, whereas that of P turned into a sol again at 55-86 °C, indicating that end-capping with FF improved the gel stability against heat. In addition, the carboxylic acids of the FF end-groups can form coordination bonds with metal ions, and the gel modulus at 37 °C increased from 15-21 KPa (P) to 20-25 KPa (FFPFF) to 24-28 KPa (FFPFF-Zn), and the duration of gel against water-erosion increased from 24 h (P) to 60 h (FFPFF-Zn), leading to a useful biomaterial for sustained drug delivery. The FFPFF-Zn gels implanted in the rats' subcutaneous layer induced a mild inflammatory responses. Contrary to the previous end-capping of Pluronics by poly(lactic acid), polycarprolactone, carboxylic acid, and so on that weakened the gel stability, the diphenylalanine end-capping strengthened the stability of Pluronics gel against heat and water-erosion. This paper suggests that the control of polymer nanoassemblies directed by FF end-groups improves the mechanical properties and stability of the resulting thermogel and, thus, provides a useful drug delivery carrier with prolonged durability.
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Affiliation(s)
- Hae An Kim
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
| | - Hyun Jung Lee
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
| | - Ja Hye Hong
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
| | - Hyo Jung Moon
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
| | - Du Young Ko
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
| | - Byeongmoon Jeong
- Department of Chemistry and Nanoscience, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea
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28
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Development of an injectable pseudo-bone thermo-gel for application in small bone fractures. Int J Pharm 2017; 520:39-48. [DOI: 10.1016/j.ijpharm.2017.01.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 01/17/2017] [Accepted: 01/19/2017] [Indexed: 11/18/2022]
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29
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Wang J, Zhang C, Yang C, Zhang C, Wang M, Zhang J, Xu Y. Superhydrophilic Antireflective Periodic Mesoporous Organosilica Coating on Flexible Polyimide Substrate with Strong Abrasion-Resistance. ACS APPLIED MATERIALS & INTERFACES 2017; 9:5468-5476. [PMID: 28107616 DOI: 10.1021/acsami.6b14117] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Superhydrophilic antireflective periodic mesoporous organosilica (PMO) coating was prepared on flexible polyimide substrate via solvent-evaporation-induced self-assembly (SEISA) method, in which tetraethoxysilane (TEOS) and a special bridged silsesquioxane were used as reactants. The bridged silsesquioxane, EG-BSQ, was synthesized through the stoichiometric reaction between 3-glycidoxyporpyltrimethoxysilane (GPTMS) and ethylene diamine (EDA). Under the influence of surfactant, TEOS and EG-BSQ co-condensed and enclosed the ordered mesporous in the coating. The results of grazing-incidence small-angle X-ray scattering (GISAXS) and the transmission electron microscope (TEM) indicated that the mesopores belonged to a Fmmm orthorhombic symmetry structure. With increasing EG-BSQ concentration, the mesoporous structure in the PMO coating becomes more and more disordered because silica mesopore walls shrunk or collapsed during calcination and consequently the refractive index of PMO coating became larger. The antireflective (AR) PMO coating showed an optical transmittance of 99.54% on polyimide (PI) much higher than the 88.68% of bare PI. The water contact angle of PMO coating was less than 9.0°, which indicated the AR PMO coating was superhydrophilic. Moreover, the PMO coating showed an excellent mechanical property, the transmittance of the PMO coating displayed a very low loss of 0.1% after abrasion of 25 cycles by CS-10F wearaser.
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Affiliation(s)
- Jing Wang
- Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China
- State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an 710119, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Cong Zhang
- Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Chunming Yang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201204, China
| | - Ce Zhang
- Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Mengchao Wang
- Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Jing Zhang
- Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China
- State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an 710119, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Yao Xu
- State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an 710119, China
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30
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Zirak Hassan Kiadeh S, Ghaee A, Mashak A, Mohammadnejad J. Preparation of chitosan-silica/PCL composite membrane as wound dressing with enhanced cell attachment. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.4016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Shahrzad Zirak Hassan Kiadeh
- Department of Life Science Engineering, Faculty of New Sciences and Technologies; University of Tehran; PO Box: 143951374 Tehran Iran
| | - Azadeh Ghaee
- Department of Life Science Engineering, Faculty of New Sciences and Technologies; University of Tehran; PO Box: 143951374 Tehran Iran
| | - Arezou Mashak
- Iran Polymer and Petrochemical Institute; PO Box: 14965/115 Tehran Iran
| | - Javad Mohammadnejad
- Department of Life Science Engineering, Faculty of New Sciences and Technologies; University of Tehran; PO Box: 143951374 Tehran Iran
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Gonçalves LC, Seabra AB, Pelegrino MT, de Araujo DR, Bernardes JS, Haddad PS. Superparamagnetic iron oxide nanoparticles dispersed in Pluronic F127 hydrogel: potential uses in topical applications. RSC Adv 2017. [DOI: 10.1039/c6ra28633j] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The present study is focused on the synthesis and characterization of nitric oxide (NO)-releasing superparamagnetic iron oxide nanoparticles, and their incorporation in Pluronic F127 hydrogel with great potential for topical applications.
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Affiliation(s)
- L. C. Gonçalves
- Exact and Earth Science Department
- Universidade Federal de São Paulo
- UNIFESP
- Diadema
- Brazil
| | - A. B. Seabra
- Exact and Earth Science Department
- Universidade Federal de São Paulo
- UNIFESP
- Diadema
- Brazil
| | - M. T. Pelegrino
- Exact and Earth Science Department
- Universidade Federal de São Paulo
- UNIFESP
- Diadema
- Brazil
| | - D. R. de Araujo
- Human and Natural Sciences Center
- Universidade Federal do ABC
- UFABC
- Santo André
- Brazil
| | - J. S. Bernardes
- Brazilian Center for Research in Energy and Materials
- CNPEM
- Campinas
- Brazil
| | - P. S. Haddad
- Exact and Earth Science Department
- Universidade Federal de São Paulo
- UNIFESP
- Diadema
- Brazil
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32
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Feuser PE, Arévalo JMC, Junior EL, Rossi GR, da Silva Trindade E, Rocha MEM, Jacques AV, Ricci-Júnior E, Santos-Silva MC, Sayer C, de Araújo PHH. Increased cellular uptake of lauryl gallate loaded in superparamagnetic poly(methyl methacrylate) nanoparticles due to surface modification with folic acid. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2016; 27:185. [PMID: 27787810 DOI: 10.1007/s10856-016-5796-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/13/2016] [Indexed: 06/06/2023]
Abstract
Lauryl gallate loaded in superparamagnetic poly(methyl methacrylate) nanoparticles surface modified with folic acid were synthesized by miniemulsion polymerization in just one step. In vitro biocompatibility and cytotoxicity assays on L929 (murine fibroblast), human red blood, and HeLa (uterine colon cancer) cells were performed. The effect of folic acid at the nanoparticles surface was evaluated through cellular uptake assays in HeLa cells. Results showed that the presence of folic acid did not affect substantially the polymer particle size (~120 nm), the superparamagnetic behavior, the encapsulation efficiency of lauryl gallate (~87 %), the Zeta potential (~38 mV) of the polymeric nanoparticles or the release profile of lauryl gallate. The release profile of lauryl gallate from superparamagnetic poly(methyl methacrylate) nanoparticles presented an initial burst effect (0-1 h) followed by a slow and sustained release, indicating a biphasic release system. Lauryl gallate loaded in superparamagnetic poly(methyl methacrylate) nanoparticles with folic acid did not present cytotoxicity effects on L929 and human red blood cells. However, free lauryl gallate presented significant cytotoxic effects on L929 and human red blood cells at all tested concentrations. The presence of folic acid increased the cytotoxicity of lauryl gallate loaded in nanoparticles on HeLa cells due to a higher cellular uptake when HeLa cells were incubated at 37 °C. On the other hand, when the nanoparticles were incubated at low temperature (4 °C) cellular uptake was not observed, suggesting that the uptake occurred by folate receptor mediated energy-dependent endocytosis. Based on presented results our work suggests that this carrier system can be an excellent alternative in targeted drug delivery by folate receptor.
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Affiliation(s)
- Paulo Emilio Feuser
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | | | - Enio Lima Junior
- Laboratório de Resonancias Magnéticas, Centro Atómico Bariloche & CONICET, San Carlos de Bariloche, Argentina
| | | | | | | | - Amanda Virtuoso Jacques
- Department of Clinical Analyses, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Eduardo Ricci-Júnior
- Department of Pharmacy, Federal University of Rio Janeiro, Rio de Janeiro, Brazil
| | | | - Claudia Sayer
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Pedro H Hermes de Araújo
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.
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Interaction between amphipathic triblock copolymers and L-α-dipalmitoyl phosphatidylcholine large unilamellar vesicles. Colloids Surf B Biointerfaces 2016; 148:30-40. [DOI: 10.1016/j.colsurfb.2016.08.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 08/19/2016] [Accepted: 08/22/2016] [Indexed: 11/24/2022]
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Palacio J, Agudelo NA, Lopez BL. PLA/Pluronic®nanoparticles as potential oral delivery systems: Preparation, colloidal and chemical stability, and loading capacity. J Appl Polym Sci 2016. [DOI: 10.1002/app.43828] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Juliana Palacio
- Grupo De Investigación Ciencia De Los Materiales; Instituto De Química; Facultad De Ciencias Exactas Y Naturales; Universidad De Antioquia; Calle 70 N° 52-21 Medellín Colombia
| | - Natalia A. Agudelo
- Grupo De Investigación Ciencia De Los Materiales; Instituto De Química; Facultad De Ciencias Exactas Y Naturales; Universidad De Antioquia; Calle 70 N° 52-21 Medellín Colombia
| | - Betty L. Lopez
- Grupo De Investigación Ciencia De Los Materiales; Instituto De Química; Facultad De Ciencias Exactas Y Naturales; Universidad De Antioquia; Calle 70 N° 52-21 Medellín Colombia
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Fuentes I, Blanco-Fernandez B, Alvarado N, Leiva Á, Radić D, Alvarez-Lorenzo C, Concheiro A. Encapsulation of Antioxidant Gallate Derivatives in Biocompatible Poly(ε-caprolactone)-b-Pluronic-b-Poly(ε-caprolactone) Micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3331-3339. [PMID: 26986801 DOI: 10.1021/acs.langmuir.5b04748] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Formulation of antioxidant agents is still a challenge that limits their application in the biomedical field. Pentablock copolymers obtained through modification of two common PEO-PPO-PEO copolymers (Pluronic F127 and F68) with poly(ε-carprolactone) (PCL) were evaluated regarding their capability to form nanocarriers suitable for gallic acid, methyl gallate, and ethyl gallate. Applying a dialysis method, PCL/F127/PCL and PCL/F68/PCL self-assembled into spherical micelles in 0.9% NaCl aqueous solution but notably differed in critical micellar concentration (CMC), micelle core hydrophobicity, and micelle size, as evidenced by pyrene fluorescence, transmission electron microscopy, and dynamic light scattering. Cytotoxicity studies showed that the copolymers were safe at concentrations well above the CMC. Transfer of gallic acid and derivatives from aqueous medium to the micelle phase was characterized in terms of distribution constant and free energy of transference, which were shown to be strongly dependent on the hydrophobicity of the gallate derivatives and the length of PCL in the pentablock copolymer. Antioxidant activity of gallates was challenged against DPPH previously loaded in PCL/F127/PCL and PCL/F68/PCL micelles. The more the hydrophobicity of the gallate derivative, the greater the capability to enter in the micelle and to consume free radicals. In vitro release studies of gallic acid, methyl gallate, and ethyl gallate from the pentablock copolymer micelles also evidenced the influence of the hydrophobicity of both the gallate derivative and the micelle core on release rate, recording a variety of release patterns. Overall, PCL/F127/PCL and PCL/F68/PCL appear as suitable nanocarriers of potent antioxidant agents in a wide range of polarities, which may be useful for diverse therapeutic applications.
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Affiliation(s)
- Irma Fuentes
- Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile , Santiago 7820436, Chile
- Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera , Temuco 4811230, Chile
| | - Bárbara Blanco-Fernandez
- Departamento de Farmacia y Tecnología Farmaceútica, Facultad de Farmacia, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain
- Michigan State University, Radiology , 610 West Ottawa Street, Apartment 811, Lansing, Michigan 48933, United States
| | - Nancy Alvarado
- Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile , Santiago 7820436, Chile
| | - Ángel Leiva
- Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile , Santiago 7820436, Chile
| | - Deodato Radić
- Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile , Santiago 7820436, Chile
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmaceútica, Facultad de Farmacia, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain
| | - Angel Concheiro
- Departamento de Farmacia y Tecnología Farmaceútica, Facultad de Farmacia, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain
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Cai Y, Wang S, Wu M, Tsosie JK, Xie X, Wan J, He C, Tian H, Chen X, Chen M. PCL–F68–PCL/PLGA–PEG–PLGA mixed micelles mediated delivery of mitoxantrone for reversing multidrug resistant in breast cancer. RSC Adv 2016. [DOI: 10.1039/c5ra27648a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mitoxantrone-loaded PCL–F68–PCL/PLGA–PEG–PLGA mixed micelles for reversing multidrug resistant in breast cancer.
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Affiliation(s)
- Yuee Cai
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- China
| | - Shengpeng Wang
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- China
| | - Minghui Wu
- Department of Cell Biology and Anatomy
- College of Medicine
- University of Florida
- Gainesville
- USA
| | | | - Xi Xie
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Jianbo Wan
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- China
| | - Chengwei He
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- China
| | - Huayu Tian
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Meiwan Chen
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- China
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Patil S, Choudhary B, Rathore A, Roy K, Mahadik K. Enhanced oral bioavailability and anticancer activity of novel curcumin loaded mixed micelles in human lung cancer cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2015; 22:1103-1111. [PMID: 26547533 DOI: 10.1016/j.phymed.2015.08.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 08/04/2015] [Accepted: 08/11/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND Curcumin has a wide range of pharmacological activities including antioxidant, anti-inflammatory, antidiabetic, antibacterial, wound healing, antiatherosclerotic, hepatoprotective and anti-carcinogenic. However, its clinical applications are limited owing to its poor aqueous solubility, multidrug pump P-gp efflux, extensive in vivo metabolism and rapid elimination due to glucuronidation/sulfation. PURPOSE The objective of the current work was to prepare novel curcumin loaded mixed micelles (CUR-MM) of Pluronic F-127 (PF127) and Gelucire® 44/14 (GL44) in order to enhance its oral bioavailability and cytotoxicity in human lung cancer cell line A549. STUDY DESIGN 3(2) Factorial design was used to assess the effect of formulation variables for optimization of mixed micelle batch. METHODS CUR-MM was prepared by a solvent evaporation method. The optimized CUR-MM was evaluated for size, entrapment efficiency (EE), in vitro curcumin release, cytotoxicity and oral bioavailability in rats. RESULTS The average size of CUR-MM was found to be around 188 ± 3 nm with an EE of about 76.45 ± 1.18% w/w. In vitro dissolution profile of CUR-MM revealed controlled release of curcumin. Additionally, CUR-MM showed significant improvement in cytotoxic activity (3-folds) and oral bioavailability (around 55-folds) of curcumin as compared to curcumin alone. Such significant improvement in cytotoxic activity and oral bioavailability of curcumin when formulated into mixed micelles could be attributed to solubilization of hydrophobic curcumin into micelle core along with P-gp inhibition effect of both, PF127 and GL44. CONCLUSION Thus the present work propose the formulation of mixed micelles of PF127 and GL44 which can act as promising carrier systems for hydrophobic drugs such as curcumin with significant improvement in their oral bioavailability.
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Affiliation(s)
- Sharvil Patil
- Bharati Vidyapeeth Deemed University, Poona College of Pharmacy, Department of Pharmaceutics, Erandwane, Pune 411038, Maharashtra, India.
| | - Bhavana Choudhary
- Bharati Vidyapeeth Deemed University, Poona College of Pharmacy, Department of Pharmaceutics, Erandwane, Pune 411038, Maharashtra, India
| | - Atul Rathore
- Bharati Vidyapeeth Deemed University, Poona College of Pharmacy, Department of Pharmaceutical Chemistry, Erandwane, Pune 411038, Maharashtra, India
| | - Krishtey Roy
- Bharati Vidyapeeth Deemed University, Poona College of Pharmacy, Department of Pharmaceutics, Erandwane, Pune 411038, Maharashtra, India
| | - Kakasaheb Mahadik
- Bharati Vidyapeeth Deemed University, Poona College of Pharmacy, Department of Pharmaceutical Chemistry, Erandwane, Pune 411038, Maharashtra, India
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38
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Li J, Xie H, Liu Y, Ren H, Zhao W, Huang X. Au-F127 strawberry-like nanospheres as an electrochemical interface for sensitive detection of carcinoembryonic antigen in real sample. Talanta 2015; 144:404-10. [DOI: 10.1016/j.talanta.2015.06.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 06/18/2015] [Accepted: 06/23/2015] [Indexed: 01/31/2023]
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39
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Jeong CJ, Lee G, In I, Park SY. Concentration-mediated multicolor fluorescence polymer carbon dots. LUMINESCENCE 2015; 31:897-904. [DOI: 10.1002/bio.3050] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 09/16/2015] [Accepted: 09/17/2015] [Indexed: 01/06/2023]
Affiliation(s)
- Chan Jin Jeong
- Department of IT Convergence; Korea National University of Transportation; Chungju Republic of Korea
| | - Gibaek Lee
- Department of Chemical and Biological Engineering; Korea National University of Transportation; Chungju Republic of Korea
| | - Insik In
- Department of IT Convergence; Korea National University of Transportation; Chungju Republic of Korea
- Department of Polymer Science and Engineering; Korea National University of Transportation; Chungju Republic of Korea
| | - Sung Young Park
- Department of IT Convergence; Korea National University of Transportation; Chungju Republic of Korea
- Department of Chemical and Biological Engineering; Korea National University of Transportation; Chungju Republic of Korea
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40
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Chen Y, Zhang W, Huang Y, Gao F, Fang X. Dual-functional c(RGDyK)-decorated Pluronic micelles designed for antiangiogenesis and the treatment of drug-resistant tumor. Int J Nanomedicine 2015; 10:4863-81. [PMID: 26257522 PMCID: PMC4525800 DOI: 10.2147/ijn.s86827] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Dual-functional drug delivery system was developed by decorating c(RGDyK) (cyclic RGD [arginine-glycine-aspartic acid] peptide) with Pluronic polymeric micelles (c[RGDyK]-FP-DP) to overcome the drawbacks of low transport of chemotherapeutics across the blood–tumor barrier and poor multidrug-resistant (MDR) tumor therapy. c(RGDyK) that can bind to the integrin protein richly expressed at the site of tumor vascular endothelial cells and tumor cells with high affinity and specificity was conjugated to the N-hydroxysuccinimide-activated PEO terminus of the Pluronic F127 block copolymer. In this study, decreased tumor angiogenic and increased apoptotic activity in MDR cancer cells were observed after the treatment with c(RGDyK)-FP-DP. c(RGDyK)-FP-DP was fully characterized in terms of morphology, particle size, zeta potential, and drug release. Importantly, in vitro antiangiogenesis results demonstrated that c(RGDyK)-FP-DP had a significant inhibition effect on the tubular formation of human umbilical vein endothelial cells and promoted cellular apoptotic activity in MDR KBv cells. In addition, the growth inhibition efficacy of KBv tumor spheroids after crossing the blood–tumor barrier was obviously increased by c(RGDyK)-FP-DP compared to other control groups. Results suggested that c(RGDyK)-decorated Pluronic polymeric micelles can take pharmacological action on both human umbilical vein endothelial cells and KBv MDR cancer cells, resulting in a dual-functional anticancer effect similar to that observed in our in vitro cellular studies.
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Affiliation(s)
- Yanzuo Chen
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Fudan University, Shanghai, People's Republic of China ; Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai, People's Republic of China
| | - Wei Zhang
- Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai, People's Republic of China ; CONRAD, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Arlington, VA, USA
| | - Yukun Huang
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Fudan University, Shanghai, People's Republic of China
| | - Feng Gao
- Department of Pharmaceutics, School of Pharmacy, East China University of Science and Technology, Fudan University, Shanghai, People's Republic of China
| | - Xiaoling Fang
- Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai, People's Republic of China
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The mechanical and biological properties of polycarbonate-modified F127 hydrogels after incorporating active pendent double-bonds. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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42
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Chang C, Dan H, Zhang LP, Chang MX, Sheng YF, Zheng GH, Zhang XZ. Fabrication of thermoresponsive, core-crosslinked micelles based on poly[N-isopropyl acrylamide-co-3-(trimethoxysilyl)propylmethacrylate]-b-poly{N-[3-(dimethylamino)propyl]methacrylamide} for the codelivery of doxorubicin and nucleic acid. J Appl Polym Sci 2014. [DOI: 10.1002/app.41752] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Cong Chang
- Key Laboratory of Chinese Medicine Resource and Compound Prescription of Ministry of Education; Hubei University of Chinese Medicine; Wuhan 430065 People's Republic of China
| | - Hong Dan
- Key Laboratory of Chinese Medicine Resource and Compound Prescription of Ministry of Education; Hubei University of Chinese Medicine; Wuhan 430065 People's Republic of China
| | - Li-Ping Zhang
- Key Laboratory of Chinese Medicine Resource and Compound Prescription of Ministry of Education; Hubei University of Chinese Medicine; Wuhan 430065 People's Republic of China
| | - Ming-Xiang Chang
- Affiliated Hospital; Hubei University of Chinese Medicine; Wuhan 430061 People's Republic of China
| | - Yin-Feng Sheng
- Affiliated Hospital; Hubei University of Chinese Medicine; Wuhan 430061 People's Republic of China
| | - Guo-Hua Zheng
- Key Laboratory of Chinese Medicine Resource and Compound Prescription of Ministry of Education; Hubei University of Chinese Medicine; Wuhan 430065 People's Republic of China
| | - Xian-Zheng Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of Chemistry; Wuhan University; Wuhan 430072 People's Republic of China
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Zou L, Li X, Zhang Q, Shen J. An abrasion-resistant and broadband antireflective silica coating by block copolymer assisted sol-gel method. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10481-10486. [PMID: 25117300 DOI: 10.1021/la502397e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A double-layer broadband antireflective (AR) coating was prepared on glass substrate via sol-gel process using two kinds of acid-catalyzed TEOS-derived silica sols. The relative dense layer with a porosity of ∼10% was obtained from an as-prepared sol, while the porous layer with a porosity of ∼55% was from a modified one with block copolymer (BCP) Pluronic F127 as template which results in abundant ordered mesopores. The two layers give rise to a reasonable refractive index gradient from air to the substrate and thus high transmittance in a wide wavelength range, and both of them have the same tough skeleton despite different porosity, for which each single-layer and the double-layer coatings all behaved well in the mechanical property tests. The high transmittance and the strong ability of resisting abrasion make this coating promising for applications in some harsh conditions. In addition, the preparation is simple, low-cost, time-saving, and flexible for realizing the optical property.
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Affiliation(s)
- Liping Zou
- Shanghai Key Laboratory of Special Artificial Microstructure and Technology, School of Physics Science and Engineering, Tongji University , Shanghai 200092, China
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Leiva A, Fuentes I, Bossel E, Urzúa M, Méndez M, Pino M, Radić D, Márquez V, González-Nilo FD. Block copolymers in the synthesis of gold nanoparticles. Two new approaches: Copolymer aggregates as reductants and stabilizers and simultaneous formation of copolymer aggregates and gold nanoparticles. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27354] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Angel Leiva
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Irma Fuentes
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Esteban Bossel
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Marcela Urzúa
- Universidad de Chile, Facultad de Ciencias; Departamento de Química; Santiago 7800024 Chile
| | - Maximiliano Méndez
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Maximiliano Pino
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Deodato Radić
- Pontificia Universidad Católica de Chile, Facultad de Química, Departamento de Química Física; Santiago 7820436 Chile
| | - Valeria Márquez
- Universidad Andrés Bello, Facultad de Ciencias Biológicas, Centro de Bioinformática y Biología Integrativa; Santiago 8370146 Chile
| | - Fernando. D. González-Nilo
- Universidad Andrés Bello, Facultad de Ciencias Biológicas, Centro de Bioinformática y Biología Integrativa; Santiago 8370146 Chile
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Evaluation of an injectable thermosensitive hydrogel as drug delivery implant for ocular glaucoma surgery. PLoS One 2014; 9:e100632. [PMID: 24950176 PMCID: PMC4065085 DOI: 10.1371/journal.pone.0100632] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 05/28/2014] [Indexed: 11/20/2022] Open
Abstract
In this study, a biodegradable thermo-sensitive hydrogel from poly(trimethylene carbonate)15-F127-poly(trimethylene carbonate)15 (PTMC15-F127-PTMC15) was designed and evaluated as an injectable implant during ocular glaucoma filtration surgery in vivo and in vitro. Mitomycin C (MMC) was loaded into this hydrogel for controlled released to prolong the efficacy and to reduce the long-term toxicity. The properties of the hydrogel were confirmed using 1H NMR and gel permeation chromatography (GPC). Compared to the Pluronic F127 hydrogel, the PTMC15-F127-PTMC15 hydrogel showed a good solution-gel transition temperature at 37°C, a lower work concentration of 5% w/v and a longer mass loss time of more than 2 weeks. The in vitro study showed that the drug could be released from PTMC15-F127-PTMC15 (5% w/v) hydrogel for up to 16 days with only 57% of drug released in the first day. Moreover, the cell toxicity, which was tested via LDH and ANNEXIN V/PI, decreased within 72 h in human tenon's fibroblast cells (HTFs). The in vivo behavior in a rabbit glaucoma filtration surgery model indicated that this hydrogel loaded with 0.1 mg/ml MMC led to a better functional bleb with a prolonged mean bleb survival time (25.5±2.9 days). The scar tissue formation, new collagen deposition and myofibroblast generation appeared to be reduced upon histological and immunohistochemistry examinations, with no obvious side effects and inflammatory reactions. The in vitro and in vivo results demonstrated that this novel hydrogel is a safe and effective drug delivery candidate in ocular glaucoma surgery.
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Bhomia R, Trivedi V, Mitchell JC, Coleman NJ, Snowden MJ. Effect of Pressure on the Melting Point of Pluronics in Pressurized Carbon Dioxide. Ind Eng Chem Res 2014. [DOI: 10.1021/ie501344m] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruchir Bhomia
- Department of Pharmaceutical,
Chemical and Environmental Science, University of Greenwich, Central
Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
| | - Vivek Trivedi
- Department of Pharmaceutical,
Chemical and Environmental Science, University of Greenwich, Central
Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
| | - John C. Mitchell
- Department of Pharmaceutical,
Chemical and Environmental Science, University of Greenwich, Central
Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
| | - Nichola J. Coleman
- Department of Pharmaceutical,
Chemical and Environmental Science, University of Greenwich, Central
Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
| | - Martin J. Snowden
- Department of Pharmaceutical,
Chemical and Environmental Science, University of Greenwich, Central
Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
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47
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Song Y, Tian Q, Huang Z, Fan D, She Z, Liu X, Cheng X, Yu B, Deng Y. Self-assembled micelles of novel amphiphilic copolymer cholesterol-coupled F68 containing cabazitaxel as a drug delivery system. Int J Nanomedicine 2014; 9:2307-17. [PMID: 24872693 PMCID: PMC4026555 DOI: 10.2147/ijn.s61220] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Despite being one of the most promising amphiphilic block copolymers, use of Pluronic F68 in drug delivery is limited due to its high critical micelle concentration (CMC). In this study, we developed a novel F68 derivative, cholesterol-coupled F68 (F68-CHMC). This new derivative has a CMC of 10 μg/mL, which is 400-fold lower than that of F68. The drug-loading capacity of F68-CHMC was investigated by encapsulating cabazitaxel, a novel antitumor drug. Drug-loaded micelles were fabricated by a self-assembly method with simple dilution. The optimum particle size of the micelles was 17.5±2.1 nm, with an entrapment efficiency of 98.1% and a drug loading efficiency of 3.16%. In vitro release studies demonstrated that cabazitaxel-loaded F68-CHMC micelles had delayed and sustained-release properties. A cytotoxicity assay of S180 cells showed that blank F68-CHMC was noncytotoxic with a cell viability of nearly 100%, even at a concentration of 1,000 μg/mL. The IC50 revealed that cabazitaxel-loaded F68-CHMC micelles were more cytotoxic than Tween 80-based cabazitaxel solution and free cabazitaxel. In vivo antitumor activity against S180 cells also indicated better tumor inhibition by the micelles (79.2%) than by Tween 80 solution (56.2%, P<0.05). Based on these results, we conclude that the F68-CHMC copolymer may be a potential nanocarrier to improve the solubility and biological activity of cabazitaxel and other hydrophobic drugs.
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Affiliation(s)
- Yanzhi Song
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Qingjing Tian
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Zhenjun Huang
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Di Fan
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Zhennan She
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Xinrong Liu
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Xiaobo Cheng
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Bin Yu
- Liaoning Medical Device Test Institute, Shenyang, People's Republic of China
| | - Yihui Deng
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
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48
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Shao Y, Jia YG, Shi C, Luo J, Zhu XX. Block and random copolymers bearing cholic acid and oligo(ethylene glycol) pendant groups: aggregation, thermosensitivity, and drug loading. Biomacromolecules 2014; 15:1837-44. [PMID: 24725005 PMCID: PMC4020593 DOI: 10.1021/bm5002262] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of block and random copolymers consisting of oligo(ethylene glycol) and cholic acid pendant groups were synthesized via ring-opening metathesis polymerization of their norbornene derivatives. These block and random copolymers were designed to have similar molecular weights and comonomer ratios; both types of copolymers showed thermosensitivity in aqueous solutions with similar cloud points. The copolymers self-assembled into micelles in water as shown by dynamic light scattering and transmission electron microscopy. The hydrodynamic diameter of the micelles formed by the block copolymer is much larger and exhibited a broad and gradual shrinkage from 20 to 54 °C below its cloud point, while the micelles formed by the random copolymers are smaller in size but exhibited some swelling in the same temperature range. Based on in vitro drug release studies, 78% and 24% paclitaxel (PTX) were released in 24 h from micelles self-assembled by the block and random copolymers, respectively. PTX-loaded micelles formed by the block and random copolymers exhibited apparent antitumor efficacy toward the ovarian cancer cells with a particularly low half-maximal inhibitory concentration (IC50) of 27.4 and 40.2 ng/mL, respectively. Cholic acid-based micelles show promise as a versatile and potent platform for cancer chemotherapy.
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Affiliation(s)
- Yu Shao
- Département de Chimie, Université de Montréal , C.P. 6128, Succ. Centre-ville, Montréal, Quebec H3C 3J7, Canada
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MacNeill CM, Graham EG, Levi‐Polyachenko NH. Soft template synthesis of donor–acceptor conjugated polymer nanoparticles: Structural effects, stability, and photothermal studies. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27176] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christopher M. MacNeill
- Department of Plastic and Reconstructive SurgeryWake Forest University Health SciencesWinston‐Salem North Carolina27157
| | - Elizabeth G. Graham
- Department of Plastic and Reconstructive SurgeryWake Forest University Health SciencesWinston‐Salem North Carolina27157
| | - Nicole H. Levi‐Polyachenko
- Department of Plastic and Reconstructive SurgeryWake Forest University Health SciencesWinston‐Salem North Carolina27157
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50
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Anand U, Mukherjee S. Microheterogeneity and microviscosity of F127 micelle: the counter effects of urea and temperature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1012-1021. [PMID: 24410288 DOI: 10.1021/la4049192] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
F127 is the most widely studied triblock copolymer and due to the presence of very long polypropylene oxide (PPO) and polyethylene oxide (PEO) groups, F127 micelle has different microenvironments clearly separated into core, corona, and peripheral regions. Urea has been known to have adverse effects on the micellar properties and causes demicellization and solvation; on the other hand, rise in temperature causes micellization and solvent evacuation from the core and corona regions. In the present study, we have investigated the microheterogeneity of the core, corona, and peripheral regions of the F127 micelle using red edge excitation shift (REES) at different temperatures and urea concentrations and correlated the effect of both on the micellar system. It was found that the temperature counteracts the effect of urea and also that the counteraction is more prominent in the core region with respect to corona, and the peripheral region is least affected. Also, the core and corona regions are very much heterogeneous, while the peripheral region is more of a homogeneous nature. Using time-resolved fluorescence anisotropy, we found that the microviscosity within the micelles vary in the order of core > corona > peripheral region, and urea has a general tendency to reduce the microviscosity, especially for core and corona regions. On the other hand, rise in temperature initially increases and then decreases the microviscosity throughout, and at elevated temperatures the effect of urea is being dominated by the effect of temperature, thereby establishing the counter effects of temperature and urea on the F127 micellar system.
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Affiliation(s)
- Uttam Anand
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal , Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
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