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Tampucci S, Monti D, Burgalassi S, Terreni E, Paganini V, Di Gangi M, Chetoni P. Binary Polymeric Surfactant Mixtures for the Development of Novel Loteprednol Etabonate Nanomicellar Eyedrops. Pharmaceuticals (Basel) 2023; 16:864. [PMID: 37375811 DOI: 10.3390/ph16060864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/01/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023] Open
Abstract
The treatment of several ocular inflammatory conditions affecting different areas of the ocular globe involves the administration of topical ophthalmic formulations containing corticosteroids. This research was aimed at evaluating the solubilising efficacy of 5.0% w/w of different binary mixtures of commercial amphiphilic polymeric surfactants with the purpose of obtaining nanomicellar solutions containing a high amount of loteprednol etabonate (LE). The selected LE-TPGS/HS nanomicelles, containing 0.253 mg/mL of the drug, had a small size (=13.57 nm) and uniform distribution (Polydispersity Index = 0.271), appeared completely transparent and perfectly filterable through 0.2 μm membrane filter, and remained stable up to 30 days at 4 °C. The critical micellar concentration (CMCTPGS/HS) was 0.0983 mM and the negative value of the interaction parameter between the polymeric-surfactant-building unit (βTPGS/HS = -0.1322) confirmed the ability of the polymeric surfactants to interact, favouring the dissolution of LE into nanomicelles. The disappearance of the endothermic peak of LE in the DSC analysis confirmed the interactions of LE with the polymeric surfactants. LE-TPGS/HS produced in vitro LE which sustained diffusion for 44 h (more than 40% of encapsulated LE). Furthermore, the lack of a significant cytotoxic effect on a sensitive corneal epithelial cell line makes it a candidate for further biological studies.
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Affiliation(s)
- Silvia Tampucci
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy
- Italian Inter-University Center for the Promotion of the 3Rs in Teaching and Research, University of Pisa, 56122 Pisa, Italy
| | - Daniela Monti
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy
- Italian Inter-University Center for the Promotion of the 3Rs in Teaching and Research, University of Pisa, 56122 Pisa, Italy
| | - Susi Burgalassi
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy
- Italian Inter-University Center for the Promotion of the 3Rs in Teaching and Research, University of Pisa, 56122 Pisa, Italy
| | | | | | | | - Patrizia Chetoni
- Department of Pharmacy, University of Pisa, 56126 Pisa, Italy
- Italian Inter-University Center for the Promotion of the 3Rs in Teaching and Research, University of Pisa, 56122 Pisa, Italy
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2
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Interaction of an imidazolium based ionic liquid with antidepressant drugs: A physicochemical study. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128159] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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3
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Kabong MA, Focke WW, Du Toit EL, Rolfes H, Ramjee S. Breakdown mechanisms of oil-in-water emulsions stabilised with Pluronic F127 and co-surfactants. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124101] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Ponnusamy C, Sugumaran A, Krishnaswami V, Kandasamy R, Natesan S. Design and development of artemisinin and dexamethasone loaded topical nanodispersion for the effective treatment of age-related macular degeneration. IET Nanobiotechnol 2019; 13:868-874. [PMID: 31625529 DOI: 10.1049/iet-nbt.2019.0130] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Age-related macular degeneration (AMD) is a disease affecting the macula by the new blood vessels formation. AMD is widely treated with a combination of anti-angiogenic and anti-vascular endothelial growth factor (VEGF) agents. The topical administration of nanodispersions showed enhanced ocular residence time with controlled and prolonged drug delivery to the disease site at the back of the eye. In the present study we developed and characterized nanodispersion containing anti-angiogenic (artemisinin) and anti-VEGF agent (dexamethasone) for the topical ocular administration in order to obtain a required drug concentration in the posterior part of the eye. The nanodispersions were prepared with varying concentration of polymer, polyvinyl pyrrolidone K90 and polymeric surfactant, Poloxamer 407. The nanodispersions were found to be smooth and spherical in shape with a size range of 12-26 nm. In-vitro drug release studies showed the 90-101% of artemisinin and 55-103% of dexamethasone release from the nanodispersions. The blank formulation with a high concentration of polymer and polymeric surfactant showed an acceptable level of haemolysis and DNA damage. The chorioallantoic membrane assay suggested that the nanodispersion possess good anti-angiogenic effect. Hence the formulated artemisinin and dexamethasone nanodispersion may have the great potential for the AMD treatment.
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Affiliation(s)
- Chandrasekar Ponnusamy
- Department of Pharmaceutical Technology, Bharathidasan Institute of Technology, Anna University, Tiruchirappalli, Tamilnadu, India
| | - Abimanyu Sugumaran
- Department of Pharmaceutics, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Tamilnadu, India
| | - Venkateshwaran Krishnaswami
- Department of Pharmaceutical Technology, Bharathidasan Institute of Technology, Anna University, Tiruchirappalli, Tamilnadu, India
| | - Ruckmani Kandasamy
- Department of Pharmaceutical Technology, Bharathidasan Institute of Technology, Anna University, Tiruchirappalli, Tamilnadu, India
| | - Subramanian Natesan
- Department of Pharmaceutical Technology, Bharathidasan Institute of Technology, Anna University, Tiruchirappalli, Tamilnadu, India.
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Angi R, Solymosi T, Erdősi N, Jordán T, Kárpáti B, Basa-Dénes O, Ujhelyi A, McDermott J, Roe C, Mair S, Ötvös Z, Molnár L, Glavinas H. Preparation, Pre-clinical and Clinical Evaluation of a Novel Rapidly Absorbed Celecoxib Formulation. AAPS PharmSciTech 2019; 20:90. [PMID: 30684094 DOI: 10.1208/s12249-018-1270-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 12/04/2018] [Indexed: 11/30/2022] Open
Abstract
Celecoxib (Celebrex®) is the only widely used NSAID that selectively inhibits the COX-2 isoenzyme. Celebrex® is absorbed slowly in the fasted state and food intake further delays absorption. In this work, an amorphous water dispersible granule formulation of celecoxib is described with in vitro characterization, preclinical and clinical data. The formulation exhibited very high passive permeability and apparent solubility, significantly outperforming the micronized celecoxib and the drug product Celebrex®. The granule formulation remained stable for at least 1 year in stability tests. In dog studies, tmax was 1 h with over 50% of Cmax reached within 15 min regardless of food intake. A phase 1 clinical trial was conducted with 12 volunteers at 100- and 200-mg doses. Celecoxib plasma concentrations reached 250 ng/ml, the effective therapeutic plasma level, in less than 15 min regardless of food or dose. The novel celecoxib formulation is rapidly absorbed, demonstrating the potential utility as an acute treatment offering advantages over the currently marketed product.
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de Oliveira EG, Machado PRL, Farias KJS, da Costa TR, Melo DMA, Lacerda AF, de Freitas Fernandes-Pedrosa M, Cornélio AM, da Silva-Junior AA. Tailoring structural properties of spray-dried methotrexate-loaded poly (lactic acid)/poloxamer microparticle blends. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2019; 30:12. [PMID: 30617752 DOI: 10.1007/s10856-018-6214-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 12/28/2018] [Indexed: 06/09/2023]
Abstract
Drug delivery systems can overcome cancer drug resistance, improving the efficacy of chemotherapy agents. Poly (lactic acid) (PLA) microparticles are an interesting alternative because their hydrophobic surface and small particle size could facilitate interactions with cells. In this study, two poloxamers (PLX 407 and 188) were applied to modulate the structural features, the drug release behavior and the cell viability from spray-dried microparticles. Five formulations with different PLA: PLX blend ratio (100:0, 75:25, 50:50, 25:50, and 0:100) were well-characterized by SEM, particle size analysis, FTIR spectroscopy, differential scanning calorimetry (DSC), and X-ray diffraction analysis (XRD). The spray-dried microparticles showed higher drug loading, spherical-shape, and smaller particle size. The type of poloxamer and blend ratio affected their structural and functional properties such as morphology, crystallinity, blend miscibility, drug release rate, and cell viability. The methotrexate (MTX), a model drug, was loaded in amorphous spray-dried microparticles. Moreover, the drug release studies demonstrated that PLX induced a leaching-effect of MTX from PLA: PLX blends, suggesting the formation of MTX/PLX micelles in aqueous medium. This finding was better established by cell viability assays. Therefore, biocompatible PLA: PLX blends showed promising in vitro results, and further in vivo studies will be performed to evaluate the performance of this chemotherapeutic agent.
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Affiliation(s)
- Edilene Gadelha de Oliveira
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, Gal. Gustavo Cordeiro de Farias, Petrópolis, 59072-570, Natal, RN, Brazil
| | - Paula Renata Lima Machado
- Department of Clinical Analysis, Federal University of Rio Grande do Norte, UFRN, Av. Gal. Gustavo Cordeiro de Farias s/n, Petropolis, 59012-570, Natal, RN, Brazil
| | - Kleber Juvenal Silva Farias
- Department of Clinical Analysis, Federal University of Rio Grande do Norte, UFRN, Av. Gal. Gustavo Cordeiro de Farias s/n, Petropolis, 59012-570, Natal, RN, Brazil
| | - Tiago R da Costa
- Institute of Chemistry, Federal University of Rio Grande do Norte, UFRN, Lagoa Nova, 59072-970, Natal, RN, Brazil
| | - Dulce Maria Araújo Melo
- Institute of Chemistry, Federal University of Rio Grande do Norte, UFRN, Lagoa Nova, 59072-970, Natal, RN, Brazil
| | - Ariane Ferreira Lacerda
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, Gal. Gustavo Cordeiro de Farias, Petrópolis, 59072-570, Natal, RN, Brazil
| | - Matheus de Freitas Fernandes-Pedrosa
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, Gal. Gustavo Cordeiro de Farias, Petrópolis, 59072-570, Natal, RN, Brazil
| | - Alianda Maira Cornélio
- Department of Morphology, Federal University of Rio Grande do Norte, UFRN, Lagoa Nova, 59072-970, Natal, RN, Brazil
| | - Arnóbio Antônio da Silva-Junior
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, Gal. Gustavo Cordeiro de Farias, Petrópolis, 59072-570, Natal, RN, Brazil.
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7
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Muza U, Greyling G, Pasch H. Core microstructure, morphology and chain arrangement of block copolymer self-assemblies as investigated by thermal field-flow fractionation. J Chromatogr A 2018; 1562:87-95. [DOI: 10.1016/j.chroma.2018.05.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/22/2018] [Accepted: 05/27/2018] [Indexed: 12/01/2022]
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8
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Khosharay S, Talebi M, Saeed TA, Talaghani SS. Experimental and modeling study of the surface tension and interface of aqueous solutions of alcohols, cetyltrimethylammonium bromide (CTAB) and their mixtures. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.10.123] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Muza UL, Greyling G, Pasch H. Characterization of Complex Polymer Self-Assemblies and Large Aggregates by Multidetector Thermal Field-Flow Fractionation. Anal Chem 2017; 89:7216-7224. [DOI: 10.1021/acs.analchem.7b01445] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Upenyu L. Muza
- Department of Chemistry and
Polymer Science, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa
| | - Guilaume Greyling
- Department of Chemistry and
Polymer Science, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa
| | - Harald Pasch
- Department of Chemistry and
Polymer Science, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa
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10
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Ali HH, Hussein AA. Oral nanoemulsions of candesartan cilexetil: formulation, characterization and in vitro drug release studies. AAPS OPEN 2017. [DOI: 10.1186/s41120-017-0016-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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11
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Sharma S, Kamil M. Studies on the Interaction Between Polyethylene Oxide and Cationic Gemini/Conventional Surfactants. Chem Ind 2017. [DOI: 10.1080/00194506.2017.1289128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Shikha Sharma
- Department of Petroleum Studies, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Kamil
- Department of Petroleum Studies, Aligarh Muslim University, Aligarh 202002, India
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12
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Hong W, Shi H, Qiao M, Gao X, Yang J, Tian C, Zhang D, Niu S, Liu M. Rational design of multifunctional micelles against doxorubicin-sensitive and doxorubicin-resistant MCF-7 human breast cancer cells. Int J Nanomedicine 2017; 12:989-1007. [PMID: 28243082 PMCID: PMC5315207 DOI: 10.2147/ijn.s127417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Even though a tremendous number of multifunctional nanocarriers have been developed to tackle heterogeneous cancer cells, little attention has been paid to elucidate how to rationally design a multifunctional nanocarrier. In this study, three individual functions (active targeting, stimuli-triggered release and endo-lysosomal escape) were evaluated in doxorubicin (DOX)-sensitive MCF-7 cells and DOX-resistant MCF-7/ADR cells by constructing four kinds of micelles with active-targeting (AT-M), passive targeting, pH-triggered release (pHT-M) and endo-lysosomal escape (endoE-M) function, respectively. AT-M demonstrated the strongest cytotoxicity against MCF-7 cells and the highest cellular uptake of DOX due to the folate-mediated endocytosis. However, AT-M failed to exhibit the best efficacy against MCF-7/ADR cells, while endoE-M exhibited the strongest cytotoxicity against MCF-7/ADR cells and the highest cellular uptake of DOX due to the lowest elimination of DOX from the cells. This was attributed to the carrier-facilitated endo-lysosomal escape of DOX, which avoided exocytosis by lysosome secretion, resulting in an effective accumulation of DOX in the cytoplasm. The enhanced elimination of DOX from the MCF-7/ADR cells also accounted for the remarkable decrease in cytotoxicity against the cells of AT-M. Three micelles were further evaluated with MCF-7 cells and MCF-7/ADR-resistant cells xenografted mice model. In accordance with the in vitro results, AT-M and endoE-M demonstrated the strongest inhibition on the MCF-7 and MCF-7/ADR xenografted tumor, respectively. Active targeting and active targeting in combination with endo-lysosomal escape have been demonstrated to be the primary function for a nanocarrier against doxorubicin-sensitive and doxorubicin-resistant MCF-7 cells, respectively. These results indicate that the rational design of multifunctional nanocarriers for cancer therapy needs to consider the heterogeneous cancer cells and the primary function needs to be integrated to achieve effective payload delivery.
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Affiliation(s)
- Wei Hong
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Hong Shi
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Jiangning, Nanjing
| | - Mingxi Qiao
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, People's Republic of China
| | - Xiang Gao
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Jie Yang
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Chunlian Tian
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Dexian Zhang
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Shengli Niu
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
| | - Mingchun Liu
- Key Laboratory of Zoonosis of Liaoning, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenhe, Shenyang, Liaoning
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Mahajan RK, Chabba S, Sharma R. Interaction of an Amphiphilic Drug Trifluoperazine Dihydrochloride with Pluronic Triblock Copolymers: A Physicochemical Study. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403828u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Rakesh Kumar Mahajan
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
| | - Shruti Chabba
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
| | - Rabia Sharma
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
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Poloxamers as Drug-Delivery Systems: Physicochemical, Pharmaceutical, and Toxicological Aspects. Nanotoxicology 2014. [DOI: 10.1007/978-1-4614-8993-1_13] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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15
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Parmar A, Chavda S, Bahadur P. Pluronic–cationic surfactant mixed micelles: Solubilization and release of the drug hydrochlorothiazide. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Reversing multidrug resistance by intracellular delivery of Pluronic® P85 unimers. Biomaterials 2013; 34:9602-14. [PMID: 24021757 DOI: 10.1016/j.biomaterials.2013.08.032] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 08/10/2013] [Indexed: 12/27/2022]
Abstract
Pluronics have been demonstrated as excellent multidrug resistance (MDR) reversal agent in the form of unimers rather than micelles. However, the effective intracellular delivery of Pluronic(®) unimers to MDR cancer cells still remains a big challenge. To address this issue, a mixed micellar system based mainly on the pH-sensitive copolymer of poly (L-histidine)-poly (D,L-lactide)-polyethyleneglycol-poly (D,L-lactide)-poly (L-histidine) (PHis-PLA-PEG-PLA-PHis) and Pluronic(®) F127, some of which was conjugated with folate, was constructed to intracellularly deliver the unimers of Pluronic(®) P85 to MDR cells. The folate-mediated endosomal pH-sensitive mixed micelles (pHendoSM-P85/f) were prepared by a thin-film hydration method, by which Pluronic(®) P85 unimers and doxorubicin (DOX) were incoporated into the mixed micelles. The incorporation of Pluronic(®) P85 unimers was investigated by the surface tension test. The results indicated that the Pluronic(®) P85 unimers probably first inserted into the binary mixed micelles and then formed a triple-component mixed micelles with Pluronic(®) F127 and PHis-PLA-PEG-PLA-PHis as the loading content increased. Further analyzed with flow cytometry, confocal laser scanning microscopy (CLSM) and MTT assay, the micelles with inserted Pluronic(®) P85 unimers demonstrated much more cellular uptake and higher cytotoxicity against MDR cells than the triple-component mixed micelles and plain Pluronic(®) micelles. The enhanced MDR reversal effect was attributed to the successful intracellular delivery of Pluronic(®) P85 unimers to the MDR cells, which was confirmed by the subcellular colocalization of Pluronic(®) P85 unimers with mitochondria, the decreased ATP energy and mitochondrial membrane potential (MP) in the MCF-7/ADR cells. The pHendoSM-P85/f/DOX also demonstrated more dramatic antitumor efficiency and remarkable reduction of ATP energy in the MDR cells in tumors than the control formulations. The intracellular delivery of Pluronic(®) P85 unimers to the MDR cells based on the targeted and endosomal pH triggerd release mixed micelles has been demonstrated as a promising approach to reverse MDR.
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Massey KA, Snelling AM, Nicolaou A. Quantitative analysis of surfactant deposits on human skin by liquid chromatography/electrospray ionisation tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:1371-1376. [PMID: 20391611 DOI: 10.1002/rcm.4528] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Surfactants are commonly used as cleansing agents and yet there are concerns that they may also have a role in skin irritation. The lack of suitable methods for the quantitative and qualitative analysis of surfactant deposition on skin has hindered the in-depth investigation of such effects. Here, we report the application of reversed-phase liquid chromatography/electrospray ionisation tandem mass spectrometry (LC/ESI-MS/MS) assays for two surfactants commonly used in consumer products, namely sodium lauryl ether sulfate (SLES) and laurylamidopropyl betaine (LAPB), to a baseline study aiming to assess deposition levels on human skin. The linearity of the assays was established at 3-20 ng, with coefficient of variation below 5%. The detection limits were 100 pg for LAPB and 1 ng for SLES; quantitation limits were 500 pg for LAPB and 2.5 ng for SLES. The baseline study was conducted using a panel of 40 healthy volunteers. Skin extract samples were taken in triplicate from forearms, using ethanol. SLES was detected on most volunteers, with 75% of them having SLES deposits in the range of 100-600 ng/cm(2). LAPB was detected on the skin of all volunteers with 85% of them having deposit levels within the concentration range of 1-100 ng/cm(2). These results demonstrate the extent to which commonly used surfactants remain on the skin during the day. The analytical methods reported here can be applied to the investigation of surfactants in relation to general skin condition and to the development and optimisation of new consumer wash products.
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Affiliation(s)
- Karen A Massey
- Bradford School of Pharmacy, School of Life Sciences, University of Bradford, Bradford BD7 1DP, UK
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18
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Extracellular matrix binding mixed micelles for drug delivery applications. J Control Release 2009; 137:146-51. [PMID: 19332089 DOI: 10.1016/j.jconrel.2009.03.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 03/20/2009] [Accepted: 03/22/2009] [Indexed: 11/20/2022]
Abstract
We present the formation of collagen-binding mixed micelles and their potential suitability to deliver therapeutic drugs to the vessel wall. We modified poly(ethylene oxide)-bl-poly(propylene oxide)-bl-poly(ethylene oxide) (Pluronic F-127) to display sulfate groups on the terminus of the PEO block to act as a heparin mimics and bind to collagen in the extracellular matrix. This functionalized macroamphiphile was incorporated into a mixed micelle with poly(propylene sulfide)-bl-poly(ethylene oxide), a macroamphiphile that demonstrates improved micellar stability relative to Pluronic F-127 micelles. The mixed micelles were examined using analytical ultracentrifugation, dynamic light scattering, transmission electron microscopy, and measures of the critical micellar concentration using surface tensiometry. Encapsulation and in vitro release of Sirolimus, an immunosuppressant drug of interest in coronary artery treatment, was considered as an example. Mixed micelles with the sulfate functionality demonstrated enhanced binding to collagen I coated surfaces, suggestive of the potential for binding to the extracellular milieu.
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