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  1. Article: DNA-nanostructure-templated assembly of planar and curved lipid-bilayer membranes.

    Elbahnasawy, Mostafa A / Nasr, Mahmoud L

    Frontiers in chemistry

    2023  Volume 10, Page(s) 1047874

    Abstract: Lipid-bilayer nanodiscs and liposomes have been developed to stabilize membrane proteins in order to study their structures and functions. Nanodiscs are detergent-free, water-soluble, and size-controlled planar phospholipid-bilayer platforms. On the ... ...

    Abstract Lipid-bilayer nanodiscs and liposomes have been developed to stabilize membrane proteins in order to study their structures and functions. Nanodiscs are detergent-free, water-soluble, and size-controlled planar phospholipid-bilayer platforms. On the other hand, liposomes are curved phospholipid-bilayer spheres with an aqueous core used as drug delivery systems and model membrane platforms for studying cellular activities. A long-standing challenge is the generation of a homogenous and monodispersed lipid-bilayer system with a very wide range of dimensions and curvatures (elongation, bending, and twisting). A DNA-origami template provides a way to control the shapes, sizes, and arrangements of lipid bilayers
    Language English
    Publishing date 2023-02-08
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2711776-5
    ISSN 2296-2646
    ISSN 2296-2646
    DOI 10.3389/fchem.2022.1047874
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Ecofriendly preparation of silver nanoparticles-based nanocomposite stabilized by polysaccharides with antibacterial, antifungal and antiviral activities.

    Hasanin, Mohamed / Elbahnasawy, Mostafa A / Shehabeldine, Amr M / Hashem, Amr H

    Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine

    2021  Volume 34, Issue 6, Page(s) 1313–1328

    Abstract: In the present work, sustainable and green method was used to prepare silver nanoparticles (Ag-NPs), followed with incorporation into tertiary nanocomposite consisted of starch, oxidized cellulose and ethyl cellulose. The prepared tertiary silver- ... ...

    Abstract In the present work, sustainable and green method was used to prepare silver nanoparticles (Ag-NPs), followed with incorporation into tertiary nanocomposite consisted of starch, oxidized cellulose and ethyl cellulose. The prepared tertiary silver-nanocomposite (Ag-NC) was fully characterized via instrumental analysis (UV-vis, FT-IR, XRD, SEM, EDX and TEM) and evaluated for antibacterial, antifungal, and antiviral activities. Ag-NC significantly suppressed growth of tested bacterial strains (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis)  as compared with controls. Antifungal activity revealed that the prepared tertiary Ag-NC has a promising antifungal activity towards unicellular (Candida albicans) and multicellular fungi  ( Aspergillus niger, A. terreus, A. flavus and A. fumigatus). In same line, both Ag-NC and free Ag-NPs have shown a dose-dependent reduction in Vero cell line with maximum non-toxic dose at 6.25 and 12.5 μg/mL, respectively. Both Ag-NPs and Ag-NC exhibited antiviral effects against Herpes simplex virus, Adenovirus and Coxsackie B virus in a dose-dependent manner. Combined treatment of Ag-NPs incorporated into tertiary nanocomposite based on starch, oxidized cellulose and ethyl cellulose opens new possibilities to be more efficient nanomaterials for preventing microbial growth. In conclusion, the prepared tertiary Ag-NC has a promising antibacterial, antifungal as well as antiviral activities.
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Antifungal Agents/chemistry ; Antifungal Agents/pharmacology ; Antiviral Agents/pharmacology ; Bacillus subtilis/metabolism ; Metal Nanoparticles/chemistry ; Microbial Sensitivity Tests ; Nanocomposites/chemistry ; Silver/chemistry ; Silver/pharmacology ; Spectroscopy, Fourier Transform Infrared
    Chemical Substances Anti-Bacterial Agents ; Antifungal Agents ; Antiviral Agents ; Silver (3M4G523W1G)
    Language English
    Publishing date 2021-09-25
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1112688-7
    ISSN 1572-8773 ; 0966-0844
    ISSN (online) 1572-8773
    ISSN 0966-0844
    DOI 10.1007/s10534-021-00344-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Photocatalytic and Antimicrobial Activities of Biosynthesized Silver Nanoparticles Using

    Saied, Ebrahim / Hashem, Amr H / Ali, Omar M / Selim, Samy / Almuhayawi, Mohammed S / Elbahnasawy, Mostafa A

    Life (Basel, Switzerland)

    2022  Volume 12, Issue 9

    Abstract: The toxicity of the ecosystem has increased recently as a result of the increased industrial wastewater loaded with organic contaminants, including methylene blue (MB), which exerts serious damage to the environment. Thus, the present work aims to green ... ...

    Abstract The toxicity of the ecosystem has increased recently as a result of the increased industrial wastewater loaded with organic contaminants, including methylene blue (MB), which exerts serious damage to the environment. Thus, the present work aims to green the synthesis of silver nanoparticles (Ag-NPs) and to evaluate their degradability of notorious MB dye, as well as their antimicrobial activities. Ag-NPs were synthesized by
    Language English
    Publishing date 2022-08-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662250-6
    ISSN 2075-1729
    ISSN 2075-1729
    DOI 10.3390/life12091331
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Newly isolated coliphages for bio-controlling multidrug-resistant Escherichia coli strains

    Elbahnasawy, Mostafa A. / ElSayed, ElSayed E. / Azzam, Mohamed I.

    Environmental nanotechnology, monitoring & management. 2021 Dec., v. 16

    2021  

    Abstract: This study presents a novel coliphage-based approach for biocontrol of Multidrug-Resistant (MDR) Escherichia coli (E. coli) and coliforms in wastewater and improve the physicochemical water quality . Newly isolated coliphages and E. coli strains were ... ...

    Abstract This study presents a novel coliphage-based approach for biocontrol of Multidrug-Resistant (MDR) Escherichia coli (E. coli) and coliforms in wastewater and improve the physicochemical water quality . Newly isolated coliphages and E. coli strains were isolated from the Rosetta branch of River Nile and outlet points of five associated drains. Coliphages were characterized by transmission electron microscopy and coat protein-gene analyses. The isolated coliphages PR01, PR02, and PR03 belonged to the Siphoviridae, Myoviridae, and Podoviridae families, respectively. They exhibited, separately or in a cocktail, a wide host range pattern against wild E. coli strains with higher specificity to strains isolated from drains (87%) than those of the Rosetta branch (72%). Phage-sensitive E. coli strains exhibited elevated antibiotics resistance patterns, suggesting that they are MDR strains. Interestingly, the efficacy of phages cocktail (PR01/PR02/PR03) controlled the growth of wild MDR E. coli strains and coliform populations under laboratories conditions. The kinetic trend in removal efficiency (%) for coliforms was gradually increasing in a time-dependent manner and peaked at 12 h post incubation with phages mixture. In all water samples, total and fecal coliforms revealed at least a 30-fold reduction post 12 h of treatment with a mixture of coliphages. Physicochemical analyses of phage-treated wastewater showed reducing levels in biological oxygen demand (BOD), chemical oxygen demand (COD), turbidity, electric conductivity (EC), ammonia (NH₃), total dissolved solids (TDS) and nitrate (NO3), while rising in dissolved oxygen (DO) content compared to untreated wastewater. Overall, this study suggests that phage-based treatment could be an effective and cheap alternative approach for the reduction of water pollutants in drainage drainage and waste water and thus eventually enhance the physicochemical quality of water.
    Keywords Escherichia coli ; Myoviridae ; Podoviridae ; Siphoviridae ; administrative management ; ammonia ; biochemical oxygen demand ; biological control ; chemical oxygen demand ; coliform bacteria ; coliphages ; dissolved oxygen ; drainage ; electrical conductivity ; host range ; multiple drug resistance ; nitrates ; transmission electron microscopy ; turbidity ; wastewater ; water quality ; Nile River
    Language English
    Dates of publication 2021-12
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2821777-9
    ISSN 2215-1532
    ISSN 2215-1532
    DOI 10.1016/j.enmm.2021.100542
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: First report on isolation of

    Kalaba, Mohamed H / Sultan, Mahmoud H / Elbahnasawy, Mostafa A / El-Didamony, Samia E / Bakary, Nermeen M El / Sharaf, Mohamed H

    Biotechnology reports (Amsterdam, Netherlands)

    2022  Volume 36, Page(s) e00770

    Abstract: Fungi are potential biocontrol agents and rich sources of secondary metabolites with demonstrated biological activities. This study aimed to isolate and identify fungi from surface-sterilized honeybees ( ...

    Abstract Fungi are potential biocontrol agents and rich sources of secondary metabolites with demonstrated biological activities. This study aimed to isolate and identify fungi from surface-sterilized honeybees (
    Language English
    Publishing date 2022-10-19
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2801018-8
    ISSN 2215-017X
    ISSN 2215-017X
    DOI 10.1016/j.btre.2022.e00770
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The impact of hepatitis B virus and hepatitis C virus infections in patients with Hodgkin's and non-Hodgkin's lymphoma.

    Kadry, Dalia Y / Elbahnasawy, Mostafa A / Mansour, Mohamed Tm / El Gebaly, Omnia K / Aziz, Hala / Kamel, Mahmoud M / Abdel-Moneim, Ahmed S / Radwan, Samah

    International journal of immunopathology and pharmacology

    2023  Volume 37, Page(s) 3946320231207342

    Abstract: Background: This study aimed to determine the prevalence of HCV and occult HBV among newly diagnosed pre-treatment Egyptian lymphoma patients and evaluate patients' outcomes based on the presence of the viral infections.: Methods: The study included ... ...

    Abstract Background: This study aimed to determine the prevalence of HCV and occult HBV among newly diagnosed pre-treatment Egyptian lymphoma patients and evaluate patients' outcomes based on the presence of the viral infections.
    Methods: The study included 80 therapy-naïve lymphoma patients including 71 non-Hodgkin lymphoma (NHL) and 9 Hodgkin lymphoma disease (HD) in addition to 100 healthy volunteers. HBV screening using HBsAg and anti-HBc IgM and HCV using AB/Ag ELISA and real-time RT-PCR were screened in tested and control groups. The diagnosis was confirmed by histopathology. Overall survival (OS) and progression-free survival (PFS) were conducted to diseased patients.
    Results: Healthy patients showed 4/100, (4%) active HCV infection and 1/100, (1%) active HBV infection and no occult HBV infection. Among NHL patients, 28 were positive for HBV (6 active and 22 occult HBV infection). Occult HBV was also detected in 5/9 HD patients. HCV was detected in (30/71, 42.3%) of NHL patients and in a single HD patient. Ten occult HBV NHL patients showed a mixed infection with HCV. The incidence of both HCV and HBV are higher in NHL than HL patients. After antitumor treatment, complete remission for lymphoma was achieved in 45% of patients. Both overall survival (OS) and progression-free survival (PFS) were correlated and significantly associated with patients' LDH levels.
    Conclusions: Our findings claim the suggestive role of HCV and occult HBV infections in NHL but not HL patients in comparison to healthy control, suggesting pre-screening of related factors including occult HBV in for potential better therapy response.
    MeSH term(s) Humans ; Hepatitis B virus/genetics ; Hepacivirus ; Hepatitis B/diagnosis ; Hepatitis B/epidemiology ; Hepatitis C/drug therapy ; Hepatitis C/epidemiology ; Hepatitis C/complications ; Lymphoma, Non-Hodgkin/epidemiology ; Lymphoma, Non-Hodgkin/etiology ; Lymphoma, Non-Hodgkin/pathology
    Language English
    Publishing date 2023-10-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 645171-8
    ISSN 2058-7384 ; 0394-6320
    ISSN (online) 2058-7384
    ISSN 0394-6320
    DOI 10.1177/03946320231207342
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Cloning, expression and nanodiscs assemble of recombinant HIV-1 gp41

    Elbahnasawy, Mostafa A / El-Ghamery, Abbas A / Farag, MohamedM.S / Mansour, Mohamed T

    Microbial pathogenesis. 2019 Oct. 24,

    2019  

    Abstract: Structural studies of membrane proteins have been hurdled by their difficulty for expression in heterogeneous expression systems due to their intrinsically strong hydrophobicity and their requirements for association with other cellular membranes. This ... ...

    Abstract Structural studies of membrane proteins have been hurdled by their difficulty for expression in heterogeneous expression systems due to their intrinsically strong hydrophobicity and their requirements for association with other cellular membranes. This study aims to design a construct for expression of membrane proteins. Because of its outstanding interest in HIV-1 vaccine design, transmembrane gp41 amino acid residue 662–723 was chosen as a representative membrane protein. Therefore, we constructed expression vectors for expression of gp41(662-723) alone (pET28a-gp41(662-723)) or coupled with a fusion partner: GB1 (pET30a-GB1-gp41(662-723)) and Trx (pET32a-Trx-gp41(662-723)). For enhancing protein expression, the expression plasmids were transformed into E. coli BL-21 (DE3), E. coli T7 Express lysY/Iq and E. coli Lemo21 (DE3). Interestingly, HIV-1 gp41(662-723) was expressed as a C-terminus fusion to the fusion partner Trx (Trx-gp41(662-723)) with an apparent molecular mass of 21.8 kDa. Trx-gp41(662-723) was overexpressed into E. coli T7 Express lysY/Iq by early induction as OD600 ∼0.5 followed by incubation at 20 °C/overnight. Our data demonstrated that almost all recombinant Trx-gp41(662-723) was incorporated into lipid nanodiscs by slowing down the nanodiscs assembly process. Negative-stained electron micrographs revealed homogenous 10 nm Trx-gp41(662-723)-nanodiscs. While the neutralizing epitopes in the purified Trx-gp41(662-723) were accessible and recognizable by anti-MPER bNAbs, that epitopes were less accessibly exposed, particularly in the C-terminal region of MPER, after incorporation of Trx-gp41(662-723) into nanodiscs.
    Keywords amino acids ; cell membranes ; epitopes ; Escherichia coli ; genetic vectors ; Human immunodeficiency virus 1 ; hydrophobicity ; lipids ; membrane proteins ; molecular weight ; plasmids ; protein synthesis ; vaccine development
    Language English
    Dates of publication 2019-1024
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2019.103824
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Co-delivery of a CD4 T cell helper epitope via covalent liposome attachment with a surface-arrayed B cell target antigen fosters higher affinity antibody responses.

    Elbahnasawy, Mostafa A / Donius, Luke R / Reinherz, Ellis L / Kim, Mikyung

    Vaccine

    2018  Volume 36, Issue 41, Page(s) 6191–6201

    Abstract: Liposomal vaccines incorporating adjuvant and CD4 T cell helper peptides enhance antibody responses against weakly immunogenic B cell epitopes such as found in the membrane proximal external region (MPER) of the HIV-1 gp41 subunit. While the inclusion of ...

    Abstract Liposomal vaccines incorporating adjuvant and CD4 T cell helper peptides enhance antibody responses against weakly immunogenic B cell epitopes such as found in the membrane proximal external region (MPER) of the HIV-1 gp41 subunit. While the inclusion of exogenous helper peptides in vaccine formulations facilitates stronger and more durable antibody responses, the helper peptide incorporation strategy per se may influence the overall magnitude and quality of B cell target antigen immunogenicity. Both variability in individual peptide encapsulation as well as the potential for liposome surface-associated helper peptides to misdirect the humoral response are potential parameters impacting outcome. In this study, we used MPER/liposome vaccines as a model system to examine how the mode of the potent LACK T helper peptide formulation modulates antibody responses against the MPER antigen. We directly compared liposome surface-arrayed palmitoyl LACK (pLACK) versus soluble LACK (sLACK) encapsulated in the liposomes and free in solution. Independent of LACK formulation methods, dendritic cell activation and LACK presentation were equivalent in vivo. The frequency of MPER-specific GC B cells promoted by sLACK was higher than that stimulated by pLACK formulation, a finding associated with a significantly greater frequency of LACK-specific GC B cells induced by pLACK. While there were no significant differences in the quantity of MPER-specific serological responses, the MPER-specific antibody titer trended higher with sLACK formulated vaccines at the lower dose of LACK. However, pLACK generated relatively greater MPER-specific antibody affinities than those induced by sLACK-formulated vaccines. Overall, the results suggest that liposomal surface-associated LACK enhances immunogenicity of LACK through better engagement of LACK-specific B cells. Of note, this is not detrimental to the induction of MPER-specific immune responses; rather, the elicitation of higher affinity anti-MPER antibodies benefits from augmented help delivered via covalent linkage of the pLACK CD4 T cell epitope in conjunction with MPER/liposome presentation.
    MeSH term(s) Animals ; Antibody Formation/physiology ; B-Lymphocytes/immunology ; CD4-Positive T-Lymphocytes/immunology ; Epitopes, T-Lymphocyte/immunology ; Female ; Liposomes/chemistry ; Mice ; Mice, Inbred BALB C ; T-Lymphocytes, Helper-Inducer/immunology
    Chemical Substances Epitopes, T-Lymphocyte ; Liposomes
    Language English
    Publishing date 2018-09-07
    Publishing country Netherlands
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 605674-x
    ISSN 1873-2518 ; 0264-410X
    ISSN (online) 1873-2518
    ISSN 0264-410X
    DOI 10.1016/j.vaccine.2018.08.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Cloning, expression and nanodiscs assemble of recombinant HIV-1 gp41.

    Elbahnasawy, Mostafa A / Farag, Mohamed M S / Mansour, Mohamed T / El-Ghamery, Abbas A

    Microbial pathogenesis

    2019  Volume 138, Page(s) 103824

    Abstract: Structural studies of membrane proteins have been hurdled by their difficulty for expression in heterogeneous expression systems due to their intrinsically strong hydrophobicity and requirements for association with other cellular membranes. This study ... ...

    Abstract Structural studies of membrane proteins have been hurdled by their difficulty for expression in heterogeneous expression systems due to their intrinsically strong hydrophobicity and requirements for association with other cellular membranes. This study aims to design a construct for expression of membrane proteins. Because of its outstanding interest in HIV-1 vaccine design, transmembrane gp41 amino acid residue 662-723 was chosen as a representative membrane protein. Therefore, we constructed expression vectors for expression of gp41
    MeSH term(s) Amino Acid Sequence ; Base Sequence ; Cloning, Molecular ; Escherichia coli/genetics ; Escherichia coli/metabolism ; Gene Expression ; HIV Envelope Protein gp41/chemistry ; HIV Envelope Protein gp41/genetics ; HIV-1/genetics ; Humans ; Protein Folding ; Protein Interaction Domains and Motifs/genetics ; Protein Refolding ; Protein Unfolding ; Recombinant Proteins/genetics ; Recombinant Proteins/isolation & purification
    Chemical Substances HIV Envelope Protein gp41 ; Recombinant Proteins
    Language English
    Publishing date 2019-10-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2019.103824
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Co-delivery of a CD4 T cell helper epitope via covalent liposome attachment with a surface-arrayed B cell target antigen fosters higher affinity antibody responses

    Elbahnasawy, Mostafa A / Donius, Luke R / Reinherz, Ellis L / Kim, Mikyung

    Vaccine. 2018 Oct. 01, v. 36, no. 41

    2018  

    Abstract: Liposomal vaccines incorporating adjuvant and CD4 T cell helper peptides enhance antibody responses against weakly immunogenic B cell epitopes such as found in the membrane proximal external region (MPER) of the HIV-1 gp41 subunit. While the inclusion of ...

    Abstract Liposomal vaccines incorporating adjuvant and CD4 T cell helper peptides enhance antibody responses against weakly immunogenic B cell epitopes such as found in the membrane proximal external region (MPER) of the HIV-1 gp41 subunit. While the inclusion of exogenous helper peptides in vaccine formulations facilitates stronger and more durable antibody responses, the helper peptide incorporation strategy per se may influence the overall magnitude and quality of B cell target antigen immunogenicity. Both variability in individual peptide encapsulation as well as the potential for liposome surface-associated helper peptides to misdirect the humoral response are potential parameters impacting outcome. In this study, we used MPER/liposome vaccines as a model system to examine how the mode of the potent LACK T helper peptide formulation modulates antibody responses against the MPER antigen. We directly compared liposome surface-arrayed palmitoyl LACK (pLACK) versus soluble LACK (sLACK) encapsulated in the liposomes and free in solution. Independent of LACK formulation methods, dendritic cell activation and LACK presentation were equivalent in vivo. The frequency of MPER-specific GC B cells promoted by sLACK was higher than that stimulated by pLACK formulation, a finding associated with a significantly greater frequency of LACK-specific GC B cells induced by pLACK. While there were no significant differences in the quantity of MPER-specific serological responses, the MPER-specific antibody titer trended higher with sLACK formulated vaccines at the lower dose of LACK. However, pLACK generated relatively greater MPER-specific antibody affinities than those induced by sLACK-formulated vaccines. Overall, the results suggest that liposomal surface-associated LACK enhances immunogenicity of LACK through better engagement of LACK-specific B cells. Of note, this is not detrimental to the induction of MPER-specific immune responses; rather, the elicitation of higher affinity anti-MPER antibodies benefits from augmented help delivered via covalent linkage of the pLACK CD4 T cell epitope in conjunction with MPER/liposome presentation.
    Keywords B-lymphocytes ; CD4-positive T-lymphocytes ; Human immunodeficiency virus 1 ; adjuvants ; antibodies ; dendritic cells ; encapsulation ; epitopes ; humoral immunity ; immune response ; immunogenicity ; models ; peptides ; vaccines
    Language English
    Dates of publication 2018-1001
    Size p. 6191-6201.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 605674-x
    ISSN 1873-2518 ; 0264-410X
    ISSN (online) 1873-2518
    ISSN 0264-410X
    DOI 10.1016/j.vaccine.2018.08.014
    Database NAL-Catalogue (AGRICOLA)

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