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Papers by hoda abolhasani
Journal of Biomolecular Structure & Dynamics, Sep 24, 2020
Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World He... more Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World Health Organization (WHO) while this virus shares substantial similarity with SARS-CoV. So far, no definitive vaccine or drug has been developed to cure Covid-19 disease, since many important aspects about Covid-19 such as pathogenesis and proliferation pathways are still unclear. It was proven that human ACE2 is the main receptor for the entry of Covid-19 into lower respiratory tract epithelial cells through interaction with SARS-CoV-2 S protein. Based on this observation, it is expected that the virus infection can be inhibited if protein-protein interaction is prevented. In this study, using structure-based virtual screening of FDA databases, several lead drugs were discovered based on the ACE2-binding pocket of SARS-CoV-2 S protein. Then, binding affinity, binding modes, critical interactions, and pharmaceutical properties of the lead drugs were evaluated. Among the previously approved drugs, Diammonium Glycyrrhizinate, Digitoxin, Ivermectin, Rapamycin, Rifaximin, and Amphotericin B represented the most desirable features, and can be possible candidates for Covid-19 therapies. Furthermore, molecular dynamics (MD) simulation was accomplished for three S protein/drug complexes with the highest binding affinity and best conformation and binding free energies were also computed with the Molecular Mechanics/Poisson–Boltzmann Surface Area (MM/PBSA) method. Results demonstrated the stable binding of these compounds to the S protein; however, in order to confirm the curative effect of these drugs, clinical trials must be done.Open in a separate windowCommunicated by Ramaswamy H. Sarma
In this study, novel tetrazolic substituted para toluene sulfonamid derivatives were synthesized ... more In this study, novel tetrazolic substituted para toluene sulfonamid derivatives were synthesized using an azide-nitrile cycloaddition reaction. The easy availability of the inexpensive starting materials, avoiding isolation and handling of hazardous organic azide, and mild reaction conditions make this synthetic protocol a valuable tool for the synthesis of functionalized tetrazole compounds. All reactions proceeded smoothly to achieve the corresponding tetrazole compounds 5a, in moderate to good yields (70–78%) using ZnBr2 as a catalyst and green solvent system H2O/2-propanol. The structure of all products was confirmed by FT-IR, 1HNMR, and 13CNMR analysis. N-((2H-tetrazol-5-yl)methyl)(phenyl)-N-tosylmethanamine and N-((2H-tetrazol-5-yl)methyl)-N-tosylpyridin-2-amine Cytotoxicity evaluations of compounds 5a and 5b on HT29 cell line demonstrated that compound 5a displayed the most potent in vitro antiproliferative activity with IC50 values of 85.57 ± 6.61 µM on HT29 cells. Although,...
Journal of Molecular Structure
Proteins: Structure, Function, and Bioinformatics
Journal of vessels and circulation, Feb 10, 2021
Qom Univ Med Sci J, 2020
Received: 27 Feb, 2020 Accepted: 14 Jun, 2020 Abstract Background and Objectives: Stevioside, a n... more Received: 27 Feb, 2020 Accepted: 14 Jun, 2020 Abstract Background and Objectives: Stevioside, a natural sweetener derived from Stevia plant, has anti-cancer properties. Accordingly, the present study investigated the in vitro effects of stevioside cytotoxicity on cancerous liver (Hep G2), colon (HT29), and breast (MCF7) cells and normal human embryonic kidney cell (Hek293) compared to cisplatin as anticancer drug.
![Research paper thumbnail of Design & synthesis of novel 4'-(4-(methylsulfonyl) phenyl) 3'- p-substituted phenyl -4'H-spiro [chroman-3, 5’-isoxazol]-4-one as selective COX-2 inhibitors](https://attachments.academia-assets.com/92623875/thumbnails/1.jpg)
](Research in Pharmaceutical Sciences, 2012
Background and Aims: Nonsteroidal anti-inflammatory drugs (NSAIDs) that are widely used for the t... more Background and Aims: Nonsteroidal anti-inflammatory drugs (NSAIDs) that are widely used for the treatment of pain, fever, and inflammation, act as nonselective inhibitors of cyclooxygenase (COX) enzymes, which catalyze the formation of prostaglandins (PGs) from arachidonic acid. COX enzymes exists in at least two isoforms. COX-1 and COX-2 that inhibition of COX-1 causes the side effects of NSAIDs such as gastric ulceration, whereas inhibition of COX-2 accounts for their therapeutic effects. But recently rofecoxib (Vioxx_) and valdecoxib (Bextra_) withdrawn from the market for their side effects such as cardiovascular event. Accordingly there is still a need for novel, selective, and potent COX-2 inhibitors with a greater safe profile for the treatment of arthritis and cancer. Methods: Molecular modeling studies were performed by Autodock Vina software. The synthesis of designed compounds was started from p-substituted-benzaldehydes that converted to p-substituted-benzaldoximes using hydroxylamine and then (E)-3-(4-(methylthio)benzylidene)chroman-4-one was obtained by reaction of chroman-4-one with 4-methylthio benzaldehyde under basic condition. Oxidation by oxone gave related methyl sulfone derivatives. The final reaction was 1, 3-Dipolar cycloaddition reaction of ?-substituted-benzaldoximes with (E)-3-(4-(methylsulfonyl)benzylidene)chroman-4-one in biphasic medium of aqueous sodium hypochlorite and chloroform. Results: A new series of 4'-(4-(methylsulfonyl) phenyl) 3'-p-substituted phenyl-4'H-spiro [chroman-3, 5'isoxazol]-4-one compounds was designed and synthesized as selective cyclooxygenase-2 inhibitors. The purity of synthesized compounds was tested by chromatography. The overall yield of reactions was ranged from 60% to 92% in several stages of reaction. The structures of synthesized compounds were confirmed by ¹HNMR, IR and MS spectrometry. Conclusions: Molecular modeling and docking study showed that the methyl sulfone pharmacophore group inserted in to the secondary pocket in the active site of COX-2 enzyme so we can expect COX-2 inhibitory activity for these compounds.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Medicinal Chemistry, 2010
Iranian Journal of Pharmaceutical Research : IJPR, 2015
Interference with microtubule polymerization results in cell cycle arrest leading to cell death. ... more Interference with microtubule polymerization results in cell cycle arrest leading to cell death. Colchicine is a well-known microtubule polymerization inhibitor which does so by binding to a specific site on tubulin. A set of 3', 4'-bis (substituted phenyl)-4'H-spiro [indene-2, 5'-isoxazol]-1(3H)-one derivatives with known antiproliferative activities were evaluated for their tubulin binding modes. 3D structures of the derivatives were docked into the colchicine binding site of tubulin using GOLD 5.0 program under flexible ligand and semi-flexible receptor condition. The spiroisoxazoline derivatives bind tubulin in a similar manner to colchicine by establishing at least a hydrogen bonding to Cys241 as well as hydrophobic interactions with Leu255, Ile378 and Lys254 and few other residues at the binding pocket. It can be concluded that the spiroisoxazoline core structure common to the studied derivatives is a suitable scaffold for placing the antitubulin pharmacophoric...
Drug Development and Industrial Pharmacy
Introduction: Selective COX-2 inhibitors, such as celecoxib have been developed as a new generati... more Introduction: Selective COX-2 inhibitors, such as celecoxib have been developed as a new generation of NSAIDs with reduced GI side effects. However, rofecoxib and valdecoxib were withdrawn from the market because of an increased risk of cardiovascular problems. Recent studies specify the place of COX-2 inhibitors in cancer chemotherapy. Moreover, COX-2 is overexpressed in many solid tumours and inhibition of this enzyme in vitro using specific COX-2 inhibitors has shown that COX-2 is a potential target for novel cancer therapies.Method: Docking studies were performed by GOLD software. The synthesis of designed compounds was started from p-substituted-benzaldehydes that converted to p- substituted-benzaldoximes, and then (E)-2-(4-(methylsulfonyl)- benzylidene)-2,3-dihydro-1H-inden-1-one was obtained by reaction of 2,3-dihydro-1H-inden-1-one with 4- methylsulfonyl benzaldehyde. The final reaction was 1, 3-Dipolar cycloaddition reaction of p-substituted-benzaldoximes with mentioned cha...
The intercalation DNA binding mode of the naproxen, a non-steroidal anti-inflammatory drug, has b... more The intercalation DNA binding mode of the naproxen, a non-steroidal anti-inflammatory drug, has been reported previously. In this study, calf thymus deoxyribonucleic acid (CT-DNA) binding of zinc-naproxen complex, [Zn(naproxen)2(MeOH)2], at physiological pH has been investigated by multi-spectroscopic techniques and molecular docking. Zinc-naproxen complex displays significant binding property to the CT-DNA (Kb = 0.2 × 105 L.mol-1). All of the experimental results; relative increasing in viscosity of CT-DNA and fluorimetric studies using ethidium bromide (EB) and Hoechst 33258 probes, are indicative of groove binding mode of zinc-naproxen complex to CT-DNA. These results show that the coordination of naproxen to zinc metal switches the mode of binding from intercalation to groove. The molecular modeling also shows that the complex binds to the AT-rich region of minor groove of DNA. Structural and topography changes of DNA in interaction with the complex by atomic force microscopy ...
Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its a... more Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its antifungal properties have been proven. However, no study investigated the antifungal effects of Taraxacum perigynium, a native species of Iran. This study compared the effects of ethanolic and aqueous extracts of dandelion root on three species of Candida albicans, Aspergillus niger, and Trichophyton rubrum with fluconazole and nystatin, as antifungal drugs. Methods In this study, ethanolic and aqueous extracts of Iranian dandelion root were prepared. To evaluate the antifungal effects of dandelion root extracts and two standard antifungal drugs, fluconazole and nystatin, the Minimum Inhibitory Concentration (MIC) was recorded by evaluating the growth rate of fungi using broth microdilution method, according to the light absorption obtained from the spectrophotometer. Eventually, the obtained data were analyzed by Analysis of Variance (ANOVA). Results The present research results suggested that dandelion root ethanolic extract presented inhibitory properties on all 3 studied fungal strains. The obtained data indicated the highest inhibitory effects on Candida albicans with a minimum inhibitory concentration of 150 µg/mL. The aqueous extract of dandelion root provided no antifungal effect. Fluconazole and nystatin presented a greater antifungal effect than the ethanolic extract of dandelion root in all 3 fungal strains. Conclusion Due to various therapeutic effects and no significant adverse effects, dandelion root can be used as an adjunct therapy in the treatment and control of various fungal infections. Therefore, it is suggested to identify and isolate the compounds in Taraxacum peregrinium and other species of dandelion native to Iran. It is also recommended to evaluate the identified components concerning antifungal properties.
Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its a... more Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its antifungal properties have been proven. However, no study investigated the antifungal effects of Taraxacum perigynium, a native species of Iran. This study compared the effects of ethanolic and aqueous extracts of dandelion root on three species of Candida albicans, Aspergillus niger, and Trichophyton rubrum with fluconazole and nystatin, as antifungal drugs. Methods In this study, ethanolic and aqueous extracts of Iranian dandelion root were prepared. To evaluate the antifungal effects of dandelion root extracts and two standard antifungal drugs, fluconazole and nystatin, the Minimum Inhibitory Concentration (MIC) was recorded by evaluating the growth rate of fungi using broth microdilution method, according to the light absorption obtained from the spectrophotometer. Eventually, the obtained data were analyzed by Analysis of Variance (ANOVA). Results The present research results suggested that dandelion root ethanolic extract presented inhibitory properties on all 3 studied fungal strains. The obtained data indicated the highest inhibitory effects on Candida albicans with a minimum inhibitory concentration of 150 µg/mL. The aqueous extract of dandelion root provided no antifungal effect. Fluconazole and nystatin presented a greater antifungal effect than the ethanolic extract of dandelion root in all 3 fungal strains. Conclusion Due to various therapeutic effects and no significant adverse effects, dandelion root can be used as an adjunct therapy in the treatment and control of various fungal infections. Therefore, it is suggested to identify and isolate the compounds in Taraxacum peregrinium and other species of dandelion native to Iran. It is also recommended to evaluate the identified components concerning antifungal properties.
International Journal of Nanomedicine, Dec 1, 2019
PurposeGlucose decorated PLGA and chitosan nanoparticles (GPNPs and GCNPs) have been developed to... more PurposeGlucose decorated PLGA and chitosan nanoparticles (GPNPs and GCNPs) have been developed to examine the possibility of preventing the facilitated glucose transport to the cells through blocking the glucose transporters (Gluts) overexpressed by tumor cells.MethodsThe MTT assay was used to assess the cytotoxicity towards human colon tumor (HT-29) cells in 72 hrs. Fluorescence microscopy was employed to confirm the attachment of GPNPs to the cells. Moreover, the GPNPs effects on the apoptotic rate of HT-29 cells were analyzed. Finally, the expression levels of GLUT-1 and GLUT-4 by real-time polymerase chain reaction (RT-PCR) were assayed to investigate the response of HT-29 cells to blocking their Gluts by GPNPs.ResultsThe stability studies showed that the synthesized complexes were mostly stable (more than 80%) at various temperatures (4 to 40ºC) and pH (5.4 to 7.4) conditions. Results indicated that the survival rate of the cells was decreased to 43% and 46% after treatment with GCNPs and GPNPs, respectively. Also, the apoptosis assay results showed that the percentage of viable cells reduced to 47% after GPNPs treatment. These observations were justified by the specific interactions between the glucose terminals and the cells Gluts which resulted in blocking the entries of nutrients to the cells. It was revealed that the GLUT-1 mRNA expression after the first 24 h of treatment by GPNPs was upregulated to more than 145%, while the direction was reversed after 72 h (expression less than 45%), which coincided with the cells death. In the first 24 h, the glucose deprivation stimulated the expression of Glut-1 while the apoptotic enzymes expression was dominant at the end of 72 h treatment time.ConclusionFinally, it can be concluded that the glucose-nanoparticle complexes could be considered as promising agents in cancer therapy.
International Journal of Biological Macromolecules
Journal of Biomolecular Structure and Dynamics
Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World He... more Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World Health Organization (WHO) while this virus shares substantial similarity with SARS-CoV. So far, no definitive vaccine or drug has been developed to cure Covid-19 disease, since many important aspects about Covid-19 such as pathogenesis and proliferation pathways are still unclear. It was proven that human ACE2 is the main receptor for the entry of Covid-19 into lower respiratory tract epithelial cells through interaction with SARS-CoV-2 S protein. Based on this observation, it is expected that the virus infection can be inhibited if protein-protein interaction is prevented. In this study, using structurebased virtual screening of FDA databases, several lead drugs were discovered based on the ACE2binding pocket of SARS-CoV-2 S protein. Then, binding affinity, binding modes, critical interactions, and pharmaceutical properties of the lead drugs were evaluated. Among the previously approved drugs, Diammonium Glycyrrhizinate, Digitoxin, Ivermectin, Rapamycin, Rifaximin, and Amphotericin B represented the most desirable features, and can be possible candidates for Covid-19 therapies. Furthermore, molecular dynamics (MD) simulation was accomplished for three S protein/drug complexes with the highest binding affinity and best conformation and binding free energies were also computed with the Molecular Mechanics/Poisson-Boltzmann Surface Area (MM/PBSA) method. Results demonstrated the stable binding of these compounds to the S protein; however, in order to confirm the curative effect of these drugs, clinical trials must be done.
Journal of Biomolecular Structure & Dynamics, Sep 24, 2020
Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World He... more Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World Health Organization (WHO) while this virus shares substantial similarity with SARS-CoV. So far, no definitive vaccine or drug has been developed to cure Covid-19 disease, since many important aspects about Covid-19 such as pathogenesis and proliferation pathways are still unclear. It was proven that human ACE2 is the main receptor for the entry of Covid-19 into lower respiratory tract epithelial cells through interaction with SARS-CoV-2 S protein. Based on this observation, it is expected that the virus infection can be inhibited if protein-protein interaction is prevented. In this study, using structure-based virtual screening of FDA databases, several lead drugs were discovered based on the ACE2-binding pocket of SARS-CoV-2 S protein. Then, binding affinity, binding modes, critical interactions, and pharmaceutical properties of the lead drugs were evaluated. Among the previously approved drugs, Diammonium Glycyrrhizinate, Digitoxin, Ivermectin, Rapamycin, Rifaximin, and Amphotericin B represented the most desirable features, and can be possible candidates for Covid-19 therapies. Furthermore, molecular dynamics (MD) simulation was accomplished for three S protein/drug complexes with the highest binding affinity and best conformation and binding free energies were also computed with the Molecular Mechanics/Poisson–Boltzmann Surface Area (MM/PBSA) method. Results demonstrated the stable binding of these compounds to the S protein; however, in order to confirm the curative effect of these drugs, clinical trials must be done.Open in a separate windowCommunicated by Ramaswamy H. Sarma
In this study, novel tetrazolic substituted para toluene sulfonamid derivatives were synthesized ... more In this study, novel tetrazolic substituted para toluene sulfonamid derivatives were synthesized using an azide-nitrile cycloaddition reaction. The easy availability of the inexpensive starting materials, avoiding isolation and handling of hazardous organic azide, and mild reaction conditions make this synthetic protocol a valuable tool for the synthesis of functionalized tetrazole compounds. All reactions proceeded smoothly to achieve the corresponding tetrazole compounds 5a, in moderate to good yields (70–78%) using ZnBr2 as a catalyst and green solvent system H2O/2-propanol. The structure of all products was confirmed by FT-IR, 1HNMR, and 13CNMR analysis. N-((2H-tetrazol-5-yl)methyl)(phenyl)-N-tosylmethanamine and N-((2H-tetrazol-5-yl)methyl)-N-tosylpyridin-2-amine Cytotoxicity evaluations of compounds 5a and 5b on HT29 cell line demonstrated that compound 5a displayed the most potent in vitro antiproliferative activity with IC50 values of 85.57 ± 6.61 µM on HT29 cells. Although,...
Journal of Molecular Structure
Proteins: Structure, Function, and Bioinformatics
Journal of vessels and circulation, Feb 10, 2021
Qom Univ Med Sci J, 2020
Received: 27 Feb, 2020 Accepted: 14 Jun, 2020 Abstract Background and Objectives: Stevioside, a n... more Received: 27 Feb, 2020 Accepted: 14 Jun, 2020 Abstract Background and Objectives: Stevioside, a natural sweetener derived from Stevia plant, has anti-cancer properties. Accordingly, the present study investigated the in vitro effects of stevioside cytotoxicity on cancerous liver (Hep G2), colon (HT29), and breast (MCF7) cells and normal human embryonic kidney cell (Hek293) compared to cisplatin as anticancer drug.
Research in Pharmaceutical Sciences, 2012
Background and Aims: Nonsteroidal anti-inflammatory drugs (NSAIDs) that are widely used for the t... more Background and Aims: Nonsteroidal anti-inflammatory drugs (NSAIDs) that are widely used for the treatment of pain, fever, and inflammation, act as nonselective inhibitors of cyclooxygenase (COX) enzymes, which catalyze the formation of prostaglandins (PGs) from arachidonic acid. COX enzymes exists in at least two isoforms. COX-1 and COX-2 that inhibition of COX-1 causes the side effects of NSAIDs such as gastric ulceration, whereas inhibition of COX-2 accounts for their therapeutic effects. But recently rofecoxib (Vioxx_) and valdecoxib (Bextra_) withdrawn from the market for their side effects such as cardiovascular event. Accordingly there is still a need for novel, selective, and potent COX-2 inhibitors with a greater safe profile for the treatment of arthritis and cancer. Methods: Molecular modeling studies were performed by Autodock Vina software. The synthesis of designed compounds was started from p-substituted-benzaldehydes that converted to p-substituted-benzaldoximes using hydroxylamine and then (E)-3-(4-(methylthio)benzylidene)chroman-4-one was obtained by reaction of chroman-4-one with 4-methylthio benzaldehyde under basic condition. Oxidation by oxone gave related methyl sulfone derivatives. The final reaction was 1, 3-Dipolar cycloaddition reaction of ?-substituted-benzaldoximes with (E)-3-(4-(methylsulfonyl)benzylidene)chroman-4-one in biphasic medium of aqueous sodium hypochlorite and chloroform. Results: A new series of 4'-(4-(methylsulfonyl) phenyl) 3'-p-substituted phenyl-4'H-spiro [chroman-3, 5'isoxazol]-4-one compounds was designed and synthesized as selective cyclooxygenase-2 inhibitors. The purity of synthesized compounds was tested by chromatography. The overall yield of reactions was ranged from 60% to 92% in several stages of reaction. The structures of synthesized compounds were confirmed by ¹HNMR, IR and MS spectrometry. Conclusions: Molecular modeling and docking study showed that the methyl sulfone pharmacophore group inserted in to the secondary pocket in the active site of COX-2 enzyme so we can expect COX-2 inhibitory activity for these compounds.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
European Journal of Medicinal Chemistry, 2010
Iranian Journal of Pharmaceutical Research : IJPR, 2015
Interference with microtubule polymerization results in cell cycle arrest leading to cell death. ... more Interference with microtubule polymerization results in cell cycle arrest leading to cell death. Colchicine is a well-known microtubule polymerization inhibitor which does so by binding to a specific site on tubulin. A set of 3', 4'-bis (substituted phenyl)-4'H-spiro [indene-2, 5'-isoxazol]-1(3H)-one derivatives with known antiproliferative activities were evaluated for their tubulin binding modes. 3D structures of the derivatives were docked into the colchicine binding site of tubulin using GOLD 5.0 program under flexible ligand and semi-flexible receptor condition. The spiroisoxazoline derivatives bind tubulin in a similar manner to colchicine by establishing at least a hydrogen bonding to Cys241 as well as hydrophobic interactions with Leu255, Ile378 and Lys254 and few other residues at the binding pocket. It can be concluded that the spiroisoxazoline core structure common to the studied derivatives is a suitable scaffold for placing the antitubulin pharmacophoric...
Drug Development and Industrial Pharmacy
Introduction: Selective COX-2 inhibitors, such as celecoxib have been developed as a new generati... more Introduction: Selective COX-2 inhibitors, such as celecoxib have been developed as a new generation of NSAIDs with reduced GI side effects. However, rofecoxib and valdecoxib were withdrawn from the market because of an increased risk of cardiovascular problems. Recent studies specify the place of COX-2 inhibitors in cancer chemotherapy. Moreover, COX-2 is overexpressed in many solid tumours and inhibition of this enzyme in vitro using specific COX-2 inhibitors has shown that COX-2 is a potential target for novel cancer therapies.Method: Docking studies were performed by GOLD software. The synthesis of designed compounds was started from p-substituted-benzaldehydes that converted to p- substituted-benzaldoximes, and then (E)-2-(4-(methylsulfonyl)- benzylidene)-2,3-dihydro-1H-inden-1-one was obtained by reaction of 2,3-dihydro-1H-inden-1-one with 4- methylsulfonyl benzaldehyde. The final reaction was 1, 3-Dipolar cycloaddition reaction of p-substituted-benzaldoximes with mentioned cha...
The intercalation DNA binding mode of the naproxen, a non-steroidal anti-inflammatory drug, has b... more The intercalation DNA binding mode of the naproxen, a non-steroidal anti-inflammatory drug, has been reported previously. In this study, calf thymus deoxyribonucleic acid (CT-DNA) binding of zinc-naproxen complex, [Zn(naproxen)2(MeOH)2], at physiological pH has been investigated by multi-spectroscopic techniques and molecular docking. Zinc-naproxen complex displays significant binding property to the CT-DNA (Kb = 0.2 × 105 L.mol-1). All of the experimental results; relative increasing in viscosity of CT-DNA and fluorimetric studies using ethidium bromide (EB) and Hoechst 33258 probes, are indicative of groove binding mode of zinc-naproxen complex to CT-DNA. These results show that the coordination of naproxen to zinc metal switches the mode of binding from intercalation to groove. The molecular modeling also shows that the complex binds to the AT-rich region of minor groove of DNA. Structural and topography changes of DNA in interaction with the complex by atomic force microscopy ...
Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its a... more Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its antifungal properties have been proven. However, no study investigated the antifungal effects of Taraxacum perigynium, a native species of Iran. This study compared the effects of ethanolic and aqueous extracts of dandelion root on three species of Candida albicans, Aspergillus niger, and Trichophyton rubrum with fluconazole and nystatin, as antifungal drugs. Methods In this study, ethanolic and aqueous extracts of Iranian dandelion root were prepared. To evaluate the antifungal effects of dandelion root extracts and two standard antifungal drugs, fluconazole and nystatin, the Minimum Inhibitory Concentration (MIC) was recorded by evaluating the growth rate of fungi using broth microdilution method, according to the light absorption obtained from the spectrophotometer. Eventually, the obtained data were analyzed by Analysis of Variance (ANOVA). Results The present research results suggested that dandelion root ethanolic extract presented inhibitory properties on all 3 studied fungal strains. The obtained data indicated the highest inhibitory effects on Candida albicans with a minimum inhibitory concentration of 150 µg/mL. The aqueous extract of dandelion root provided no antifungal effect. Fluconazole and nystatin presented a greater antifungal effect than the ethanolic extract of dandelion root in all 3 fungal strains. Conclusion Due to various therapeutic effects and no significant adverse effects, dandelion root can be used as an adjunct therapy in the treatment and control of various fungal infections. Therefore, it is suggested to identify and isolate the compounds in Taraxacum peregrinium and other species of dandelion native to Iran. It is also recommended to evaluate the identified components concerning antifungal properties.
Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its a... more Background and Objectives: Dandelion (Taraxacum sp) is among the valuable medicinal plants; its antifungal properties have been proven. However, no study investigated the antifungal effects of Taraxacum perigynium, a native species of Iran. This study compared the effects of ethanolic and aqueous extracts of dandelion root on three species of Candida albicans, Aspergillus niger, and Trichophyton rubrum with fluconazole and nystatin, as antifungal drugs. Methods In this study, ethanolic and aqueous extracts of Iranian dandelion root were prepared. To evaluate the antifungal effects of dandelion root extracts and two standard antifungal drugs, fluconazole and nystatin, the Minimum Inhibitory Concentration (MIC) was recorded by evaluating the growth rate of fungi using broth microdilution method, according to the light absorption obtained from the spectrophotometer. Eventually, the obtained data were analyzed by Analysis of Variance (ANOVA). Results The present research results suggested that dandelion root ethanolic extract presented inhibitory properties on all 3 studied fungal strains. The obtained data indicated the highest inhibitory effects on Candida albicans with a minimum inhibitory concentration of 150 µg/mL. The aqueous extract of dandelion root provided no antifungal effect. Fluconazole and nystatin presented a greater antifungal effect than the ethanolic extract of dandelion root in all 3 fungal strains. Conclusion Due to various therapeutic effects and no significant adverse effects, dandelion root can be used as an adjunct therapy in the treatment and control of various fungal infections. Therefore, it is suggested to identify and isolate the compounds in Taraxacum peregrinium and other species of dandelion native to Iran. It is also recommended to evaluate the identified components concerning antifungal properties.
International Journal of Nanomedicine, Dec 1, 2019
PurposeGlucose decorated PLGA and chitosan nanoparticles (GPNPs and GCNPs) have been developed to... more PurposeGlucose decorated PLGA and chitosan nanoparticles (GPNPs and GCNPs) have been developed to examine the possibility of preventing the facilitated glucose transport to the cells through blocking the glucose transporters (Gluts) overexpressed by tumor cells.MethodsThe MTT assay was used to assess the cytotoxicity towards human colon tumor (HT-29) cells in 72 hrs. Fluorescence microscopy was employed to confirm the attachment of GPNPs to the cells. Moreover, the GPNPs effects on the apoptotic rate of HT-29 cells were analyzed. Finally, the expression levels of GLUT-1 and GLUT-4 by real-time polymerase chain reaction (RT-PCR) were assayed to investigate the response of HT-29 cells to blocking their Gluts by GPNPs.ResultsThe stability studies showed that the synthesized complexes were mostly stable (more than 80%) at various temperatures (4 to 40ºC) and pH (5.4 to 7.4) conditions. Results indicated that the survival rate of the cells was decreased to 43% and 46% after treatment with GCNPs and GPNPs, respectively. Also, the apoptosis assay results showed that the percentage of viable cells reduced to 47% after GPNPs treatment. These observations were justified by the specific interactions between the glucose terminals and the cells Gluts which resulted in blocking the entries of nutrients to the cells. It was revealed that the GLUT-1 mRNA expression after the first 24 h of treatment by GPNPs was upregulated to more than 145%, while the direction was reversed after 72 h (expression less than 45%), which coincided with the cells death. In the first 24 h, the glucose deprivation stimulated the expression of Glut-1 while the apoptotic enzymes expression was dominant at the end of 72 h treatment time.ConclusionFinally, it can be concluded that the glucose-nanoparticle complexes could be considered as promising agents in cancer therapy.
International Journal of Biological Macromolecules
Journal of Biomolecular Structure and Dynamics
Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World He... more Most recently, the new coronavirus (SARS-CoV-2) has been recognized as a pandemic by the World Health Organization (WHO) while this virus shares substantial similarity with SARS-CoV. So far, no definitive vaccine or drug has been developed to cure Covid-19 disease, since many important aspects about Covid-19 such as pathogenesis and proliferation pathways are still unclear. It was proven that human ACE2 is the main receptor for the entry of Covid-19 into lower respiratory tract epithelial cells through interaction with SARS-CoV-2 S protein. Based on this observation, it is expected that the virus infection can be inhibited if protein-protein interaction is prevented. In this study, using structurebased virtual screening of FDA databases, several lead drugs were discovered based on the ACE2binding pocket of SARS-CoV-2 S protein. Then, binding affinity, binding modes, critical interactions, and pharmaceutical properties of the lead drugs were evaluated. Among the previously approved drugs, Diammonium Glycyrrhizinate, Digitoxin, Ivermectin, Rapamycin, Rifaximin, and Amphotericin B represented the most desirable features, and can be possible candidates for Covid-19 therapies. Furthermore, molecular dynamics (MD) simulation was accomplished for three S protein/drug complexes with the highest binding affinity and best conformation and binding free energies were also computed with the Molecular Mechanics/Poisson-Boltzmann Surface Area (MM/PBSA) method. Results demonstrated the stable binding of these compounds to the S protein; however, in order to confirm the curative effect of these drugs, clinical trials must be done.