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  1. Article ; Online: Design and Construction of a Synthetic Nanobody Library: Testing Its Potential with a Single Selection Round Strategy.

    Contreras, María Angélica / Serrano-Rivero, Yunier / González-Pose, Alaín / Salazar-Uribe, Julieta / Rubio-Carrasquilla, Marcela / Soares-Alves, Matheus / Parra, Natalie C / Camacho-Casanova, Frank / Sánchez-Ramos, Oliberto / Moreno, Ernesto

    Molecules (Basel, Switzerland)

    2023  Volume 28, Issue 9

    Abstract: Nanobodies (Nbs) are single domain antibody fragments derived from heavy-chain antibodies found in members of the Camelidae family. They have become a relevant class of biomolecules for many different applications because of several important advantages ... ...

    Abstract Nanobodies (Nbs) are single domain antibody fragments derived from heavy-chain antibodies found in members of the Camelidae family. They have become a relevant class of biomolecules for many different applications because of several important advantages such as their small size, high solubility and stability, and low production costs. On the other hand, synthetic Nb libraries are emerging as an attractive alternative to animal immunization for the selection of antigen-specific Nbs. Here, we present the design and construction of a new synthetic nanobody library using the phage display technology, following a structure-based approach in which the three hypervariable loops were subjected to position-specific randomization schemes. The constructed library has a clonal diversity of 10
    MeSH term(s) Animals ; Peptide Library ; Single-Domain Antibodies ; Vascular Endothelial Growth Factor A/genetics ; Antigens ; Cell Surface Display Techniques
    Chemical Substances Peptide Library ; Single-Domain Antibodies ; Vascular Endothelial Growth Factor A ; Antigens
    Language English
    Publishing date 2023-04-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules28093708
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  2. Article ; Online: First report of bovine viral diarrhea virus subgenotypes 1d and 1e in southern Chile.

    Hugues, Florence / Cabezas, Ignacio / Garigliany, Mutien / Rivas, Felipe / Casanova, Tomás / González, Eddy E / Sánchez, Oliberto / Castillo, Raúl / Parra, Natalie C / Inostroza-Michael, Oscar / Moreno, Lucila / Hernández, Cristián E / Toledo, Jorge R

    Virology journal

    2023  Volume 20, Issue 1, Page(s) 205

    Abstract: Bovine viral diarrhea virus (BVDV) affects cattle worldwide causing severe productive and economic loss. In this study, we investigated the subgenotypes of BVDV circulating in cattle samples from the Aysén region, an active cattle breeding area located ... ...

    Abstract Bovine viral diarrhea virus (BVDV) affects cattle worldwide causing severe productive and economic loss. In this study, we investigated the subgenotypes of BVDV circulating in cattle samples from the Aysén region, an active cattle breeding area located in southern Chile. Partial amplification of the 5' untranslated region (UTR) was performed by polymerase chain reaction (PCR), and twelve samples were analyzed by Sanger sequencing and phylogenetic analysis. Eight samples were identified as belonging to Pestivirus bovis subgenotype 1e, three to 1-b, and one to 1-d. The phylogenetic analyses performed revealed a marked distance between these now-identified strains and those previously reported in the country. These findings support the need to continually expand the analysis of the variability of the viral phylogeny for the currently circulating BVDV strains and to update the vaccines recommended for this livestock area and surrounding areas.
    MeSH term(s) Animals ; Cattle ; Chile/epidemiology ; Phylogeny ; Diarrhea Viruses, Bovine Viral/genetics ; 5' Untranslated Regions ; Diarrhea
    Chemical Substances 5' Untranslated Regions
    Language English
    Publishing date 2023-09-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2160640-7
    ISSN 1743-422X ; 1743-422X
    ISSN (online) 1743-422X
    ISSN 1743-422X
    DOI 10.1186/s12985-023-02170-4
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  3. Article: Isolation, characterization, and immunomodulatory activity evaluation of probiotic strains from colostrum and canine milk.

    Quilodrán-Vega, Sandra Rayén / Muñoz-Flores, Carolina / Pino, Ana / Buldres, Paula / Sandoval, Felipe / Aguirre, Alex / Portillo, Brígida / Parra, Natalie / Altamirano, Claudia / Albarracín, Leonardo / Villena, Julio / Toledo, Jorge R

    Frontiers in veterinary science

    2023  Volume 10, Page(s) 1266064

    Abstract: Background: This study aimed to characterize potential probiotic strains for use in dogs to prevent infectious enteropathies. Lactic acid bacteria (LAB) isolated from canine milk and colostrum were characterized according to their functional properties, ...

    Abstract Background: This study aimed to characterize potential probiotic strains for use in dogs to prevent infectious enteropathies. Lactic acid bacteria (LAB) isolated from canine milk and colostrum were characterized according to their functional properties, including their resistance to gastrointestinal conditions, inhibitory effect against pathogens, and intestinal adhesion.
    Methods: The immunomodulatory effects of the strains were also analyzed in
    Results: The TUCO-16 and TUCO-17 strains induced a significant increase in the expression of TNF-α, IL-8, and TLR2 in canine macrophages. The oral administration of TUCO-16 and TUCO-17 strains to mice significantly augmented their resistance to pathogenic
    Conclusion: Both strains, TUCO-16 and TUCO-17, are potential probiotic candidates for improving intestinal health in dogs, particularly for their ability to inhibit the growth of Gram-negative pathogens common in gastrointestinal infections and modulate the animal's immune response. Further studies are required to effectively demonstrate the beneficial effects of TUCO-16 and TUCO-17 strains in dogs.
    Language English
    Publishing date 2023-11-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2834243-4
    ISSN 2297-1769
    ISSN 2297-1769
    DOI 10.3389/fvets.2023.1266064
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  4. Article: Immunomodulatory role of vasoactive intestinal peptide and ghrelin in

    Muñoz-Flores, Carolina / Roa, Francisco J / Saavedra, Paulina / Fuentealba, Pablo / Starck, María F / Ortega, Leonardo / Montesino, Raquel / Valenzuela, Ariel / Astuya, Allisson / Parra, Natalie / González-Chavarría, Iván / Sánchez, Oliberto / Toledo, Jorge R / Acosta, Jannel

    Heliyon

    2023  Volume 9, Issue 12, Page(s) e23215

    Abstract: Neuropeptides are a group of peptides derived from precursor proteins synthesized in neuronal and nonneuronal cells. The classical functions of neuropeptides have been extensively studied in mammals, including neuromodulation in the central nervous ... ...

    Abstract Neuropeptides are a group of peptides derived from precursor proteins synthesized in neuronal and nonneuronal cells. The classical functions of neuropeptides have been extensively studied in mammals, including neuromodulation in the central nervous system, molecular signaling in the peripheral nervous system, and immunomodulation associated mainly with anti-inflammatory activity. In contrast, in teleosts, studies of the immunomodulatory function of these neuropeptides are limited. In
    Language English
    Publishing date 2023-12-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e23215
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  5. Article ; Online: Effects of recombinant FSH (bscrFSH) and pituitary FSH (FSH-p) on embryo production in superovulated dairy heifers inseminated with unsorted and sex-sorted semen.

    Gutiérrez-Reinoso, Miguel A / Arreseigor, Cesar J / Driedger, Brian / Cabezas, Ignacio / Hugues, Florence / Parra, Natalie C / Sánchez, Oliberto / Toledo, Jorge R / Garcia-Herreros, Manuel

    Animal reproduction science

    2023  Volume 252, Page(s) 107226

    Abstract: Superovulation is a drug-based method used in cattle to stimulate the ovarian folliculogenesis and the number of oocytes and transferable embryos. The present study aimed to test the effects of recombinant FSH (bscrFSH) and pituitary FSH (FSH-p) on ... ...

    Abstract Superovulation is a drug-based method used in cattle to stimulate the ovarian folliculogenesis and the number of oocytes and transferable embryos. The present study aimed to test the effects of recombinant FSH (bscrFSH) and pituitary FSH (FSH-p) on ovarian response and in vivo embryo production in superovulated dairy heifers inseminated with unsorted and sex-sorted semen. Forty healthy Holstein heifers subjected to a superovulation (SOV) protocol by using FSH-p or bscrFSH were divided randomly into four groups: a) FSH-p inseminated with unsorted semen (USP; n = 10), b) FSH-p inseminated with sex-sorted semen (SSP; n = 10), c) bscrFSH inseminated with unsorted semen (USR; n = 10), and d) bscrFSH inseminated with sex-sorted semen (SSR; n = 10). Ultrasonography was carried out on Day 8 (estrus) and Day 15 (embryo collection) to evaluate the ovarian structures [follicles (FL), corpora lutea (CL), and non-ovulated follicles (NOFL)]. Embryonic-derived parameters were scored on Day 15 [total structures collected (TS), unfertilised oocytes (UFOs), total embryos (TEs), transferable embryos (TFEs), freezable embryos (FEs), and degenerated embryos (DEs)]. No differences were observed regarding ovarian structures (FL and NOFL) irrespective of SOV protocol or group assessed (P > 0.05). CL increased in bscrFSH-derived SOV protocol (P < 0.05). On Day 15, the embryonic-derived parameters TEs, TFEs, and FEs decreased in SSP/SSR compared to USP/USR (P < 0.05). Differences were observed regarding UFOs, with a greater number in SSP and SSR (P = 0.01). In conclusion, the bscrFSH-derived SOV protocol showed improved results compared to FSH-p-derived SOV protocol regarding ovarian (CL) and embryo-derived (TFE) parameters irrespective of the type of semen used.
    MeSH term(s) Animals ; Cattle ; Female ; Embryo, Mammalian ; Follicle Stimulating Hormone/pharmacology ; Insemination, Artificial/veterinary ; Semen/physiology ; Superovulation
    Chemical Substances Follicle Stimulating Hormone (9002-68-0)
    Language English
    Publishing date 2023-03-28
    Publishing country Netherlands
    Document type Journal Article ; Randomized Controlled Trial, Veterinary
    ZDB-ID 429674-6
    ISSN 1873-2232 ; 0378-4320
    ISSN (online) 1873-2232
    ISSN 0378-4320
    DOI 10.1016/j.anireprosci.2023.107226
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  6. Article ; Online: Design and characterization of a novel dimeric blood-brain barrier penetrating TNFα inhibitor.

    Manrique-Suárez, Viana / Macaya, Luis / Contreras, Maria Angélica / Parra, Natalie / Maura, Rafael / González, Alaín / Toledo, Jorge R / Sánchez, Oliberto

    Proteins

    2021  Volume 89, Issue 11, Page(s) 1508–1521

    Abstract: Tumor necrosis factor-alpha (TNFα) inhibitors could prevent neurological disorders systemically, but their design generally relies on molecules unable to cross the blood-brain barrier (BBB). This research was aimed to design and characterize a novel TNFα ...

    Abstract Tumor necrosis factor-alpha (TNFα) inhibitors could prevent neurological disorders systemically, but their design generally relies on molecules unable to cross the blood-brain barrier (BBB). This research was aimed to design and characterize a novel TNFα inhibitor based on the angiopeptide-2 as a BBB shuttle molecule fused to the extracellular domain of human TNFα receptor 2 and a mutated vascular endothelial growth factor (VEGF) dimerization domain. This new chimeric protein (MTV) would be able to trigger receptor-mediated transcytosis across the BBB via low-density lipoprotein receptor-related protein-1 (LRP-1) and inhibit the cytotoxic effect of TNFα more efficiently because of its dimeric structure. Stably transformed CHO cells successfully expressed MTV, and its purification by Immobilized-Metal Affinity Chromatography (IMAC) rendered high purity degree. Mutated VEGF domain included in MTV did not show cell proliferation or angiogenic activities measured by scratch and aortic ring assays, which corroborate that the function of this domain is restricted to dimerization. The pairs MTV-TNFα (Kd 279 ± 40.9 nM) and MTV-LRP1 (Kd 399 ± 50.5 nM) showed high affinity by microscale thermophoresis, and a significant increase in cell survival was observed after blocking TNFα with MTV in a cell cytotoxicity assay. Also, the antibody staining in CHOK1 and bEnd3 cells demonstrated the adhesion of MTV to the LRP1 receptor located in the cell membrane. These results provide compelling evidence for the proper functioning of the three main domains of MTV individually, which encourage us to continue the research with this new molecule as a potential candidate for the systemic treatment of neurological disorders.
    MeSH term(s) Animals ; Anti-Inflammatory Agents/chemistry ; Anti-Inflammatory Agents/metabolism ; Anti-Inflammatory Agents/pharmacology ; Blood-Brain Barrier/metabolism ; CHO Cells ; Cell Line ; Cell Survival/drug effects ; Cricetulus ; Endothelial Cells/cytology ; Endothelial Cells/drug effects ; Endothelial Cells/metabolism ; Endotoxins/antagonists & inhibitors ; Endotoxins/metabolism ; Endotoxins/toxicity ; Gene Expression ; Humans ; Low Density Lipoprotein Receptor-Related Protein-1/genetics ; Low Density Lipoprotein Receptor-Related Protein-1/metabolism ; Mice ; Models, Biological ; Models, Molecular ; Peptides/genetics ; Peptides/metabolism ; Protein Binding ; Protein Conformation ; Protein Engineering/methods ; Receptors, Tumor Necrosis Factor, Type II/genetics ; Receptors, Tumor Necrosis Factor, Type II/metabolism ; Recombinant Fusion Proteins/genetics ; Recombinant Fusion Proteins/metabolism ; Recombinant Fusion Proteins/pharmacology ; Tumor Necrosis Factor-alpha/antagonists & inhibitors ; Tumor Necrosis Factor-alpha/metabolism ; Tumor Necrosis Factor-alpha/toxicity ; Vascular Endothelial Growth Factor A/genetics ; Vascular Endothelial Growth Factor A/metabolism
    Chemical Substances Angiopep-2 ; Anti-Inflammatory Agents ; Endotoxins ; LRP1 protein, human ; Low Density Lipoprotein Receptor-Related Protein-1 ; Peptides ; Receptors, Tumor Necrosis Factor, Type II ; Recombinant Fusion Proteins ; Tumor Necrosis Factor-alpha ; VEGFA protein, human ; Vascular Endothelial Growth Factor A
    Language English
    Publishing date 2021-07-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 806683-8
    ISSN 1097-0134 ; 0887-3585
    ISSN (online) 1097-0134
    ISSN 0887-3585
    DOI 10.1002/prot.26173
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  7. Article ; Online: Design and functional characterization of Salmo salar TLR5 agonist peptides derived from high mobility group B1 acidic tail.

    Vásquez-Suárez, Aleikar / Muñoz-Flores, Carolina / Ortega, Leonardo / Roa, Francisco / Castillo, Carolina / Romero, Alex / Parra, Natalie / Sandoval, Felipe / Macaya, Luis / González-Chavarría, Iván / Astuya, Allisson / Starck, María Francisca / Villegas, Milton F / Agurto, Niza / Montesino, Raquel / Sánchez, Oliberto / Valenzuela, Ariel / Toledo, Jorge R / Acosta, Jannel

    Fish & shellfish immunology

    2024  Volume 146, Page(s) 109373

    Abstract: Toll-like receptor 5 (TLR5) responds to the monomeric form of flagellin and induces the MyD88-depending signaling pathway, activating proinflammatory transcription factors such as NF-κB and the consequent induction of cytokines. On the other hand, HMGB1 ... ...

    Abstract Toll-like receptor 5 (TLR5) responds to the monomeric form of flagellin and induces the MyD88-depending signaling pathway, activating proinflammatory transcription factors such as NF-κB and the consequent induction of cytokines. On the other hand, HMGB1 is a highly conserved non-histone chromosomal protein shown to interact with and activate TLR5. The present work aimed to design and characterize TLR5 agonist peptides derived from the acidic tail of Salmo salar HMGB1 based on the structural knowledge of the TLR5 surface using global molecular docking platforms. Peptide binding poses complexed on TLR5 ectodomain model from each algorithm were filtrated based on docking scoring functions and predicted theoretical binding affinity of the complex. Circular dichroism spectra were recorded for each peptide selected for synthesis. Only intrinsically disordered peptides (6W, 11W, and SsOri) were selected for experimental functional assay. The functional characterization of the peptides was performed by NF-κB activation assays, RT-qPCR gene expression assays, and Piscirickettsia salmonis challenge in SHK-1 cells. The 6W and 11W peptides increased the nuclear translation of p65 and phosphorylation. In addition, the peptides induced the expression of genes related to the TLR5 pathway activation, pro- and anti-inflammatory response, and differentiation and activation of T lymphocytes towards phenotypes such as T
    MeSH term(s) Animals ; Toll-Like Receptor 5/genetics ; Toll-Like Receptor 5/metabolism ; NF-kappa B/genetics ; NF-kappa B/metabolism ; Salmo salar/genetics ; Salmo salar/metabolism ; HMGB1 Protein ; Molecular Docking Simulation ; Peptides/pharmacology ; Flagellin/pharmacology
    Chemical Substances Toll-Like Receptor 5 ; NF-kappa B ; HMGB1 Protein ; Peptides ; Flagellin (12777-81-0)
    Language English
    Publishing date 2024-01-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1067738-0
    ISSN 1095-9947 ; 1050-4648
    ISSN (online) 1095-9947
    ISSN 1050-4648
    DOI 10.1016/j.fsi.2024.109373
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  8. Article ; Online: New insight into the biological activity of

    Ortega, Leonardo / Carrera, Crisleri / Muñoz-Flores, Carolina / Salazar, Santiago / Villegas, Milton F / Starck, María F / Valenzuela, Ariel / Agurto, Niza / Montesino, Raquel / Astuya, Allisson / Parra, Natalie / Pérez, Ercilia T / Santibáñez, Natacha / Romero, Alex / Ruíz, Pamela / Lamazares, Emilio / Reyes, Fátima / Sánchez, Oliberto / Toledo, Jorge R /
    Acosta, Jannel

    Frontiers in immunology

    2024  Volume 15, Page(s) 1191966

    Abstract: NK-lysin is a potent antimicrobial peptide (AMP) with antimicrobial activity against bacteria, fungi, viruses, and parasites. NK-lysin is a type of granulysin, a member of the saposin-like proteins family first isolated from a pig's small intestine. In ... ...

    Abstract NK-lysin is a potent antimicrobial peptide (AMP) with antimicrobial activity against bacteria, fungi, viruses, and parasites. NK-lysin is a type of granulysin, a member of the saposin-like proteins family first isolated from a pig's small intestine. In previous work, for the first time, we identified four variants of
    MeSH term(s) Animals ; Antimicrobial Peptides/metabolism ; Antimicrobial Peptides/pharmacology ; Fish Diseases/immunology ; Fish Diseases/microbiology ; Fish Proteins/metabolism ; Fish Proteins/pharmacology ; Immunity, Innate ; Proteolipids/metabolism ; Proteolipids/pharmacology ; Salmo salar/immunology ; Signal Transduction
    Chemical Substances Antimicrobial Peptides ; Fish Proteins ; NK-lysin ; Proteolipids
    Language English
    Publishing date 2024-04-09
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2024.1191966
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  9. Article ; Online: Corrigendum to "In vivo modification of the goat mammary gland glycosylation pathway" [New Biotechnol 61 (2021) 11-21].

    Leiva-Carrasco, María J / Jiménez-Chávez, Silvana / Harvey, David J / Parra, Natalie C / Tavares, Kaio C / Camacho, Frank / González, Alain / Sánchez, Oliberto / Montesino, Raquel / Toledo, Jorge R

    New biotechnology

    2022  Volume 68, Page(s) 108

    Language English
    Publishing date 2022-02-04
    Publishing country Netherlands
    Document type Published Erratum
    ZDB-ID 2400836-9
    ISSN 1876-4347 ; 1876-4347
    ISSN (online) 1876-4347
    ISSN 1876-4347
    DOI 10.1016/j.nbt.2022.01.005
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  10. Article ; Online: Fluorescence-assisted sequential insertion of transgenes (FASIT): an approach for increasing specific productivity in mammalian cells.

    Bravo, Felipe E / Parra, Natalie C / Camacho, Frank / Acosta, Jannel / González, Alaín / Toledo, Jorge R / Sanchez, Oliberto

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 12840

    Abstract: Currently, the generation of cell lines for the production of recombinant proteins has the limitation of unstable gene expression due to the repeat-induced gene silencing or the loss of transgene copies resulting from recombination events. In this work, ... ...

    Abstract Currently, the generation of cell lines for the production of recombinant proteins has the limitation of unstable gene expression due to the repeat-induced gene silencing or the loss of transgene copies resulting from recombination events. In this work, we developed a new strategy based on the sequential insertion of transgenes for generating stable clones producing high levels of a chimeric human follicle-stimulating hormone (hscFSH). Gene insertion was done by transducing HEK-293 cells with a lentiviral vector containing a bicistronic transcriptional unit for expressing hscFSH and GFP genes. Clone selection was performed by flow cytometry coupled to cell sorting, and the GFP gene was further removed by CRE-mediated site-specific recombination. High-producing clones of hscFSH were obtained after three rounds of lentiviral transduction. Expression levels increased in a step-wise manner from 7 to 23 pg/cell/day, with a relatively constant rate of 7 pg/cell/day in each round of transduction. The GFP gene was successfully removed from the cell genome without disturbing the hscFSH gene expression. Clones generated using this approach showed stable expression levels for more than two years. This is the first report describing the sequential insertion of transgenes as an alternative for increasing the expression levels of transformed cell lines. The methodology described here could notably impact on biotechnological industry by improving the capacity of mammalian cells to produce biopharmaceuticals.
    MeSH term(s) Biotechnology/methods ; Clone Cells ; Flow Cytometry/methods ; Follicle Stimulating Hormone/biosynthesis ; Follicle Stimulating Hormone/genetics ; Gene Expression ; Genetic Vectors ; Green Fluorescent Proteins/genetics ; HEK293 Cells ; Humans ; Lentivirus/genetics ; Mutagenesis, Insertional/methods ; Recombinant Proteins/biosynthesis ; Recombinant Proteins/genetics ; Transduction, Genetic ; Transgenes/genetics
    Chemical Substances Recombinant Proteins ; Green Fluorescent Proteins (147336-22-9) ; Follicle Stimulating Hormone (9002-68-0)
    Language English
    Publishing date 2020-07-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-69709-1
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