51
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M. P. G, Hani U, Shivakumar HG, Osmani RAM, Srivastava A. Polyacrylamide grafted guar gum based glimepiride loaded pH sensitive pellets for colon specific drug delivery: fabrication and characterization. RSC Adv 2015. [DOI: 10.1039/c5ra17257h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The purpose of this study was to prepare pH-sensitive pellets using an extrusion-spheronization pelletization (ESP) technique.
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Affiliation(s)
- Gowrav M. P.
- Dept. of Pharmaceutics
- JSS College of Pharmacy
- JSS University
- Mysore-570 015
- India
| | - Umme Hani
- Dept. of Pharmaceutics
- JSS College of Pharmacy
- JSS University
- Mysore-570 015
- India
| | | | - Riyaz Ali M. Osmani
- Dept. of Pharmaceutics
- JSS College of Pharmacy
- JSS University
- Mysore-570 015
- India
| | - Atul Srivastava
- Dept. of Pharmaceutics
- JSS College of Pharmacy
- JSS University
- Mysore-570 015
- India
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52
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Zhu YJ, Chen F. pH-Responsive Drug-Delivery Systems. Chem Asian J 2014; 10:284-305. [DOI: 10.1002/asia.201402715] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 07/21/2014] [Indexed: 01/28/2023]
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53
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Gao C, Liu T, Dang Y, Yu Z, Wang W, Guo J, Zhang X, He G, Zheng H, Yin Y, Kong X. pH/redox responsive core cross-linked nanoparticles from thiolated carboxymethyl chitosan for in vitro release study of methotrexate. Carbohydr Polym 2014; 111:964-70. [PMID: 25037437 DOI: 10.1016/j.carbpol.2014.05.012] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/03/2014] [Accepted: 05/06/2014] [Indexed: 01/05/2023]
Abstract
A novel amphiphilic thiolated carboxymethyl chitosan was synthesized. It self-assembled into disulfide bond cross-linked nanoparticles in deionized water. The TEM showed that these nanoparticles had a core-shell structure with an average diameter of 160 nm. Dynamic light scattering showed that the nanoparticles were stable in water solution. The particle size changed with pH values and GSH concentrations, and reached a maximum diameter at pH 7.0 and 20mM GSH respectively, exhibiting an obvious pH/redox responsibility. Methotrexate was encapsulated in nanoparticles reaching encapsulation efficiency as much as 43.4%. Release profiles of methotrexate showed a release rate of 19 wt% in pH 7.4 buffer containing 10 μM GSH, whereas as high as 93 wt% in pH 5.0 buffer containing 20mM GSH, indicating that the nanoparticles may be used for tumor-specific drug release. The anticancer activity test in vitro showed that the inhibition rate of methotrexate-loaded nanoparticles against HeLa cells reached 90%.
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Affiliation(s)
- Cheng Gao
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Ting Liu
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Yinghua Dang
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Zhiyan Yu
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Wei Wang
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jingjing Guo
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Xueqiong Zhang
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Guanghua He
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Hua Zheng
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
| | - Yihua Yin
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Xiangqi Kong
- Department of Pharmaceutical Engineering, School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, PR China
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54
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Jiang J, Xie J, Ma B, Bartlett D, Xu A, Wang CH. Mussel-inspired protein-mediated surface functionalization of electrospun nanofibers for pH-responsive drug delivery. Acta Biomater 2014; 10:1324-32. [PMID: 24287161 DOI: 10.1016/j.actbio.2013.11.012] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 10/03/2013] [Accepted: 11/17/2013] [Indexed: 01/07/2023]
Abstract
pH-responsive drug delivery systems could mediate drug releasing rate by changing the pH values at specific times as per the pathophysiological need of the disease. This paper demonstrates that a mussel-inspired protein polydopamine coating can tune the loading and releasing rate of charged molecules from electrospun poly(ε-caprolactone) (PCL) nanofibers in solutions with different pH values. In vitro release profiles show that the positive charged molecules release significantly faster in acidic than those in neutral and basic environments within the same incubation time. The results of fluorescein diacetate staining and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays show the viability of cancer cells after treatment with doxorubicin-released media at different pH values qualitatively and quantitatively, indicating that the media containing doxorubicin that were released in solutions at low pH values could kill a significantly higher number of cells than those released in solutions at high pH values. Together, the pH-responsive drug delivery systems based on polydopamine-coated PCL nanofibers could have potential application in the oral delivery of anticancer drugs for treating gastric cancer and in vaginal delivery of anti-viral drugs or anti-inflammatory drugs, which could raise their efficacy, deliver them to the specific target and minimize their toxic side effects.
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55
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Alibrandi G, Lister DG, Lo Vecchio C, Maeder M. [1.1.1]Cryptand: directions for its use as a variable-pH kinetic molecular device. NEW J CHEM 2014. [DOI: 10.1039/c3nj01215h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Liu X, Huang G. Formation strategies, mechanism of intracellular delivery and potential clinical applications of pH-sensitive liposomes. Asian J Pharm Sci 2013. [DOI: 10.1016/j.ajps.2013.11.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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57
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Abstract
In recent years, liposomes have been employed with growing success as pharmaceutical carriers for antineoplastic drugs. One specific strategy used to enhance in vivo liposome-mediated drug delivery is the improvement of intracytoplasmic delivery. In this context, pH-sensitive liposomes (pHSLip) have been designed to explore the endosomal acidification process, which may lead to a destabilization of the liposomes, followed by a release of their contents into the cell cytoplasm. This review considers the current status of pHSLip development and its applicability in cancer treatment, focusing on the mechanisms of pH sensitivity and liposomal composition of pHSLip. The final section will discuss the application of these formulations in both in vitro and in vivo studies of antitumor efficacy.
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58
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Drug carriers for oral delivery of peptides and proteins: accomplishments and future perspectives. Ther Deliv 2013; 4:251-65. [PMID: 23343163 DOI: 10.4155/tde.12.143] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Effective formulation for peptide and protein delivery through the oral route has always been the critical effort with the advent of biotechnology. Stability, enzymatic degradation and ineffective absorption are common difficulties found for conventional dosage forms. As a result, new drug-delivery approaches are used to circumvent these limitations and enhance effective oral drug delivery. Some of these technologies have reached late stages of clinical trials and promising results will be available in the near future. This review covers, in general, the recent carriers reported in literature.
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59
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Khan M, Ong ZY, Wiradharma N, Attia ABE, Yang YY. Advanced materials for co-delivery of drugs and genes in cancer therapy. Adv Healthc Mater 2012. [PMID: 23184770 DOI: 10.1002/adhm.201200109] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
With cancer being the major cause of mortality worldwide, the continued development of safe and efficacious treatments is warranted. A better understanding of the molecular mechanism and genetic basis of tumor initiation and progression, coupled with advances in chemistry, molecular biology and engineering have led to discovery of a wide range of therapeutic agents for cancer therapy. However, multidrug-resistance, which is mainly caused by malfunction of genes, has become a major problem in chemotherapy. To overcome this problem, the simultaneous delivery of genes to cancer cells has been proposed to correct the malfunctioned genes to sensitize the cells to chemotherapeutics. This progress report summarizes key advances in drug and gene delivery with focus on the development of polymers, peptides, liposomes and inorganic materials as nanocarriers for co-delivery of small molecular drugs and macromolecular genes or proteins. In addition, challenges and future perspectives in the design of nanocarriers for the co-delivery of therapeutic drugs and genes are discussed.
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Affiliation(s)
- Majad Khan
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669
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60
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Biswas SK, Paul S, Chowdhury A, Das J. Preparation and evaluation of gastroretentive floating pellets of metronidazole using Na-alginate and hydroxyl propyl methyl cellulose polymers. Pak J Biol Sci 2012; 15:290-295. [PMID: 24175426 DOI: 10.3923/pjbs.2012.290.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Gastroretentive floating pellets of metronidazole were formulated to prolong the gastric residence time in order to obtain controlled release characteristics of the drug. Nine formulations of metronidazole floating pellets such as AX, BX, CX, AY, BY, CY, AZ, BZ and CZ were prepared by extrusion method using different quantities of hydroxyl propyl methyl cellulose (HPMC) polymers such as methocel K4M premium and methocel K100LV premium in the ratio of 2:1, 1:2 and 1.5:1.5 while the amount of Na-alginate used in the formulations was 3.50, 5.25 and 7.0 g, respectively. The in vitro dissolution studies were carried out in 900 mL of phosphate buffer (pH 1.2) at 37 +/- 0.5 degrees C and 50 rpm for 6 h using USP XXIV paddle method and the content of drug release was done by UV spectrophotometer at 277 nm. It was found that the percent release of metronidazole from different formulations was different with passing of time. The drug release profile of the formulation (AX) having Na-alginate 3.50 g methocel K4M premium and methocel K100LV premium in the ratio of 2:1 showed best fit to Higuchi release kinetics with R2 value of 0.994. Finally, it might be concluded that the polymers had significant effect on drug release kinetics of metronidazole from floating pellets. The selection and use of suitable polymers in appropriate ratio might be very important in designing floating pellets and using the capabilities of these polymers, suitable floating pellets of metronidazole with desirable release rate could be formulated. Thus, in vivo research studies by the future researchers will confirm the appropriateness of these formulated metronidazole floating pellets.
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Affiliation(s)
- S K Biswas
- Department of Pharmacy, BGC Trust University Bangladesh, Chandanaish, Chittagong, Bangladesh
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61
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Makky AM, Ahmed IS, El-Nabaraw MA, Abd El-Mon RA. Development of a New Carvedilol Tablet with Rapid Onset of Action. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/ajdd.2012.55.71] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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62
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Jufri M, Azmi N, Shamsuddin AF. Effects of intravenous palm oil–based lipid nanoemulsion on fat metabolism in rabbits. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2012. [DOI: 10.1016/s2222-1808(12)60297-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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63
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Angare D, Giri T, Tripathi DK, Alexander A, . A. Unexplored Areas and New Findings in Lipid Emulsion Serving as a Potential Drug Carrier for Lipophilic Drugs: A Review. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/tmr.2012.1.24] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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64
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Samchenko Y, Ulberg Z, Korotych O. Multipurpose smart hydrogel systems. Adv Colloid Interface Sci 2011; 168:247-62. [PMID: 21782148 DOI: 10.1016/j.cis.2011.06.005] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 06/17/2011] [Accepted: 06/17/2011] [Indexed: 11/16/2022]
Abstract
This paper represents the review of the last investigations in the field of smart polymeric hydrogels and our contribution to this matter. New hydrogel systems and nanocomposites based on acrylic monomers (acrylamide, acrylonitrile, acrylic acid, N-isopropylacrylamide etc.) with incorporated nanosized colloidal silver, hydroxyapatite and carbon nanotubes with a new set of properties have been obtained and examined. These systems can sharply change their characteristics when minor external physical (electric and magnetic fields, temperature etc.) or chemical (pH, ionic strength) stimuli are applied. Such stimulus-responsive polymeric systems are very promising from the standpoint of different medical applications, especially for the development of intelligent drug delivery systems. On the base of designed hydrogel iontophoretic transdermal therapeutic systems, endoprosthesis for the replacement of bone tissue and hydrogel burns coatings with immobilized mesenchymal cells were obtained and tested.
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Affiliation(s)
- Yu Samchenko
- Ovcharenko Institute of Biocolloid Chemistry, NAS of Ukraine, Kyiv, Ukraine.
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65
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Harisa GI, Ibrahim MF, Alanazi FK, Alsarra IA. Application and Safety of Erythrocytes as a Novel Drug Delivery System. ACTA ACUST UNITED AC 2011. [DOI: 10.3923/ajb.2011.309.321] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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66
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Tang Y, Heaysman CL, Willis S, Lewis AL. Physical hydrogels with self-assembled nanostructures as drug delivery systems. Expert Opin Drug Deliv 2011; 8:1141-59. [PMID: 21619469 DOI: 10.1517/17425247.2011.588205] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
INTRODUCTION As an essential complement to chemically crosslinked hydrogels, drug delivery systems based on physical hydrogels with self-assembled nanostructures are gaining increasing attention, owing to potential advantages of reduced toxicity, convenience of in situ gel formation, stimuli-responsiveness, reversible sol-gel transition, and improved drug loading and delivery profiles. AREAS COVERED In this review, drug delivery systems based on physical hydrogels are discussed according to their self-assembled nanostructures, such as micelles, layer-by-layer constructs, supramolecular inclusion complexes, polyelectrolyte complexes and crystalline structures. The driving forces of the self-assembly include hydrophobic interaction, hydrogen bonding, electrostatic interaction, π-π stacking and weak van der Waals forces. Stimuli-responsive properties of physical hydrogels, including thermo- and pH-sensitivity, are considered with particular focus on self-assembled nanostructures. EXPERT OPINION Fabricating self-assembled nanostructures in drug delivery hydrogels, via physical interactions between polymer-polymer and polymer-drug, requires accurately controlled macro- or small molecular architecture and a comprehensive knowledge of the physicochemical properties of the therapeutics. A variety of nanostructures within hydrogels, with which payloads may interact, provide useful means to stabilize the drug form and control its release kinetics.
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Affiliation(s)
- Yiqing Tang
- Biocompatibles UK Ltd, Chapman House, Farnham, Surrey, UK.
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67
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Dubey G, Mequanint K. Conjugation of fibronectin onto three-dimensional porous scaffolds for vascular tissue engineering applications. Acta Biomater 2011; 7:1114-25. [PMID: 21073985 DOI: 10.1016/j.actbio.2010.11.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 10/23/2010] [Accepted: 11/04/2010] [Indexed: 10/18/2022]
Abstract
Tissue engineering scaffolds provide the three-dimensional (3-D) geometry and mechanical framework required for regulating cell behavior and facilitating tissue maturation. Unfortunately, most synthetic scaffolds lack the biological recognition motifs required for seeded cell interaction. In order to impart this recognition, synthetic scaffolds should possess appropriate biological functionality. Here, for the first time, we present a comprehensive study of fibronectin (FN) conjugation onto highly porous 3-D poly(carbonate) urethane scaffolds through grafted poly(acrylic acid) spacers on the urethane backbone. Scanning electron microscopy was used to ensure that the porous structures of the scaffolds were preserved throughout the multiple conjugation steps, and Fourier transform infrared spectroscopy was used to monitor the reaction progress. Toluidine blue staining revealed that increasing acrylic acid concentration and grafting time increased the number of poly(acrylic acid) groups incorporated. High resolution X-ray photoelectron spectroscopy studies of the scaffolds demonstrated an increase in nitrogen and sulfur due to FN conjugation. Immunofluorescence microscopy studies showed an even distribution of conjugated FN on the 3-D scaffolds. Cell culture studies using human coronary artery smooth muscle cells demonstrated that FN-conjugated scaffolds had improved cell attachment and infiltration depth compared with scaffolds without FN conjugation and with those scaffolds on which FN was merely adsorbed.
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68
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Saraf S, Ghosh A, Kaur CD, Saraf S. Novel Modified Nanosystem Based Lymphatic Targeting. ACTA ACUST UNITED AC 2011. [DOI: 10.3923/rjnn.2011.60.74] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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