Khalafi L.,Islamic Azad University at Tehran |
Rafiee M.,Institute for Advanced Studies in Basic Sciences |
Mahdiun F.,Islamic Azad University at Tehran |
Mahdiun F.,Osvah Pharmaceutical Co. |
Sedaghat S.,Islamic Azad University at Tehran
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012
The acid-base equilibrium of mycophenolate mofetil is studied in the absence and presence of β-cyclodextrin (β-CD). The conditional acidity constants are obtained by rank annihilation factor analysis (RAFA) as a function of β-CD concentrations. Also the stability constants for inclusion complexes of β-CD with both acidic and basic forms are calculated. The conditional acidity constant decreases by increasing β-CD concentration. The calculated stability constants show that the acidic form of mycophenolate mofetil forms more stable inclusion complex (552 ± 7 M-1) than its basic anionic form (158 ± 2 M-1). © 2012 Elsevier B.V. All rights reserved.
Zamani-Ahmadmahmudi M.,University of Tehran |
Nassiri S.M.,University of Tehran |
Jahanzad I.,Tehran University of Medical Sciences |
Shirani D.,University of Tehran |
And 2 more authors.
Tissue and Cell | Year: 2013
Mammary cancer is the most common tumor in female dogs. Canine mammary tumor serves as an excellent model for human breast cancer biology. Cancer cell lines are routinely used as the source of protein for proteomics studies because antigen homogeneity is essential for protein profiling of tumors. In this study, we sought to isolate and characterize a canine mammary cell line that was subject to protein profiling analysis through 2-dimensional electrophoresis (2-DE) method. Mammary tumor was collected from a 6-year-old terrier dog. Tumor fragments were treated with collagenase, and dissociated cells were cultured. The cell line was subcultured over 50 times. Characterization profile included population doubling time, colony forming assay, spheroid formation/migration potency, immunocytochemistry for steroid receptors and intermediate filaments, karyotyping, RT-PCR for cytokeratins 8, 14, and 18, and 2-DE pattern. The cell line revealed three growth phases including normal, dormant, and immortal phase. Immunocytochemistry showed that the cell line was positive for estrogen receptor, pancytokeratin, cytokeratin-low and vimentin, and negative for progesterone receptor, cytokeratin-high. RT-PCR supported the immunocytochemistry results. 2-DE pattern and proteome analysis of the cell line revealed that protein composition was stable, indicating the cell line as an appropriate source of protein for canine mammary proteomics studies. © 2012 Elsevier Ltd.
Saremi S.,Tehran University of Medical Sciences |
Saremi S.,Osvah Pharmaceutical Co |
Atyabi F.,Tehran University of Medical Sciences |
Akhlaghi S.P.,Tehran University of Medical Sciences |
And 2 more authors.
International Journal of Nanomedicine | Year: 2011
The aim of this study was to prepare and evaluate mucoadhesive core-shell nanoparticles based on copolymerization of thiolated chitosan coated on poly methyl methacrylate cores as a carrier for oral delivery of docetaxel. Docetaxel-loaded nanoparticles with various concentrations were prepared via a radical emulsion polymerization method using cerium ammonium nitrate as an initiator. The physicochemical properties of the obtained nanoparticles were characterized by: dynamic light-scattering analysis for their mean size, size distribution, and zeta potential; scanning electron microscopy and transmission electron microscopy for surface morphology; and differential scanning calorimetry analysis for confirmation of molecular dispersity of docetaxel in the nanoparticles. Nanoparticles were spherical with mean diameter below 200 nm, polydispersity of below 0.15, and positive zeta potential values. The entrapment efficiency of the nanoparticles was approximately 90%. In vitro release studies showed a sustained release characteristic for 10 days after a burst release at the beginning. Ex vivo studies showed a significant increase in the transportation of docetaxel from intestinal membrane of rat when formulated as nanoparticles. Cellular uptake of nanoparticles was investigated using fluoresceinamine-loaded nanoparticles. Docetaxel nanoparticles showed a high cytotoxicity effect in the Caco-2 and MCF-7 cell lines after 72 hours. It can be concluded that by combining the advantages of both thiolated polymers and colloidal particles, these nanoparticles can be proposed as a drug carrier system for mucosal delivery of hydrophobic drugs. © 2011 Saremi et al, publisher and licensee Dove Medical Press Ltd.
Saremi S.,Tehran University of Medical Sciences |
Saremi S.,Osvah Pharmaceutical Co. |
Dinarvand R.,Tehran University of Medical Sciences |
Kebriaeezadeh A.,Osvah Pharmaceutical Co. |
And 3 more authors.
BioMed Research International | Year: 2013
The aim of this study was to evaluate a nanoparticulate system with mucoadhesion properties composed of a core of polymethyl methacrylate surrounded by a shell of thiolated chitosan (Ch-GSH-pMMA) for enhancing oral bioavailability of docetaxel (DTX), an anticancer drug. DTX-loaded nanoparticles were prepared by emulsion polymerization method using cerium ammonium nitrate as an initiator. Physicochemical properties of the nanoparticles such as particle size, size distribution, morphology, drug loading, and entrapment efficiency were characterized. The pharmacokinetic study was carried out in vivo using wistar rats. The half-life of DTX-loaded NPs was about 9 times longer than oral DTX used as positive control. The oral bioavailability of DTX was increased to 68.9% for DTX-loaded nanoparticles compared to 6.5% for positive control. The nanoparticles showed stronger effect on the reduction of the transepithelial electrical resistance (TEER) of Caco-2 cell monolayer by opening the tight junctions. According to apparent permeability coefficient (P app) results, the DTX-loaded NPs showed more specific permeation across the Caco-2 cell monolayer in comparison to the DTX. In conclusion, the nanoparticles prepared in this study showed promising results for the development of an oral drug delivery system for anticancer drugs. © 2013 Shahrooz Saremi et al.
Souri E.,Tehran University of Medical Sciences |
Mottaghi S.,Tehran University of Medical Sciences |
Zargarpoor M.,Tehran University of Medical Sciences |
Ahmadkhaniha R.,Tehran University of Medical Sciences |
Jalalizadeh H.,Osvah Pharmaceutical Co.
Acta Chromatographica | Year: 2016
Rivaroxaban is an inhibitor of factor Xa, which is used as an oral anticoagulant for the prevention of thromboembolism. The objective of this study was to develop a stability-indicating high-performance liquid chromatographic method for the quantitative determination of rivaroxaban in pharmaceutical dosage forms. Rivaroxaban was subjected to acidic, basic, oxidative, photolytic, and thermal conditions for forced stress degradation studies. Considerable degradation was observed in all stress degradation tests. Rivaroxaban and its degradation products were separated on a Nova-Pak C8 column utilizing a mixture of acetonitrile and KH2PO4 50 mM (pH 3.0) (40:60, v/v) as the mobile phase, and the chromatogram was recorded at 270 nm using a general ultraviolet (UV) detector. The developed method was linear over the concentration range of 1-50 μg mL-1 showing acceptable within-day and between-day precision and accuracy values (CV <2% and Error <2%). The dissolution profile of rivaroxaban tablets was also studied in the presence of a surfactant using optimized conditions. The validated method was successfully used for the determination of rivaroxaban in dosage forms and also in dissolution medium indicating the specificity of the assay method. © The Author(s).