LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 11

Search options

  1. Article: Antigen-Induced IL-1RA Production Discriminates Active and Latent Tuberculosis Infection.

    Sanchez, Cesar / Jaramillo-Valverde, Luis / Capristano, Silvia / Solis, Gilmer / Soto, Alonso / Valdivia-Silva, Julio / Poterico, Julio A / Guio, Heinner

    Microorganisms

    2023  Volume 11, Issue 6

    Abstract: The IGRA (Interferon Gamma Release Assays) test is currently the standard specific test ... ...

    Abstract The IGRA (Interferon Gamma Release Assays) test is currently the standard specific test for
    Language English
    Publishing date 2023-05-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms11061385
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Systematic Review: Microfluidics and Plasmodium.

    Thorne, Nicolas / Flores-Olazo, Luis / Egoávil-Espejo, Rocío / Vela, Emir A / Noel, Julien / Valdivia-Silva, Julio / van Noort, Danny

    Micromachines

    2021  Volume 12, Issue 10

    Abstract: Malaria affects 228 million people worldwide each year, causing severe disease and worsening the conditions of already vulnerable populations. In this review, we explore how malaria has been detected in the past and how it can be detected in the future. ... ...

    Abstract Malaria affects 228 million people worldwide each year, causing severe disease and worsening the conditions of already vulnerable populations. In this review, we explore how malaria has been detected in the past and how it can be detected in the future. Our primary focus is on finding new directions for low-cost diagnostic methods that unspecialized personnel can apply in situ. Through this review, we show that microfluidic devices can help pre-concentrate samples of blood infected with malaria to facilitate the diagnosis. Importantly, these devices can be made cheaply and be readily deployed in remote locations.
    Language English
    Publishing date 2021-10-14
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi12101245
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article: CXCR4 Knockdown Via CRISPR/CAS9 in a Tumor-Associated Macrophage Model Decreases Human Breast Cancer Cell Migration.

    Jaramillo-Valverde, Luis / Levano, Kelly S / Capristano, Silvia / Tarazona, David D / Cisneros, Alberto / Yufra-Picardo, Velia M / Valdivia-Silva, Julio / Guio, Heinner

    Cureus

    2021  Volume 13, Issue 12, Page(s) e20842

    Abstract: Introduction Breast cancer is the leading cause of cancer-related deaths in women worldwide with the majority of deaths due to metastasis. The development of metastasis is closely related to the tumor microenvironment where tumor-associated macrophages ( ... ...

    Abstract Introduction Breast cancer is the leading cause of cancer-related deaths in women worldwide with the majority of deaths due to metastasis. The development of metastasis is closely related to the tumor microenvironment where tumor-associated macrophages (TAMs) are the main immune cell component playing a crucial role in tumor migration. Key players in tumor progression, metastasis and survival are the receptor CXCR4 and its ligand CXCL12. CXCR4 is expressed in multiple cell types including macrophages and breast cancer cells. Many studies have focus on the role of CXCR4 expressed in breast cancer cells. Methods In this study, we investigated the role of CXCR4 expressed in TAMs on breast cancer cell migration by reducing CXCR4 expression via CRISPR-CAS9 system in differentiated THP-1 cells (a TAMs model). Results According to wound healing migration assay, MCF7 cancer cells co-cultured with genetically edited dTHP-1 cells have a lower migration rate as compared to MCF7 cancer cells co-cultured with unedited and dTHP-1 cells. Conclusion The study demonstrates the role of CXCR4 on breast cancer cell migration through TAM-cancer cell crosstalk.
    Language English
    Publishing date 2021-12-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.20842
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Chemokine-Derived Peptides: Novel Antimicrobial and Antineoplasic Agents.

    Valdivia-Silva, Julio / Medina-Tamayo, Jaciel / Garcia-Zepeda, Eduardo A

    International journal of molecular sciences

    2015  Volume 16, Issue 6, Page(s) 12958–12985

    Abstract: Chemokines are a burgeoning family of chemotactic cytokines displaying a broad array of functions such as regulation of homeostatic leukocyte traffic and development, as well as activating the innate immune system. Their role in controlling early and ... ...

    Abstract Chemokines are a burgeoning family of chemotactic cytokines displaying a broad array of functions such as regulation of homeostatic leukocyte traffic and development, as well as activating the innate immune system. Their role in controlling early and late inflammatory stages is now well recognized. An improper balance either in chemokine synthesis or chemokine receptor expression contributes to various pathological disorders making chemokines and their receptors a useful therapeutic target. Research in this area is progressing rapidly, and development of novel agents based on chemokine/ chemokine receptors antagonist functions are emerging as attractive alternative drugs. Some of these novel agents include generation of chemokine-derived peptides (CDP) with potential agonist and antagonist effects on inflammation, cancer and against bacterial infections. CDP have been generated mainly from N- and C-terminus chemokine sequences with subsequent modifications such as truncations or elongations. In this review, we present a glimpse of the different pharmacological actions reported for CDP and our current understanding regarding the potential use of CDP alone or as part of the novel therapies proposed in the treatment of microbial infections and cancer.
    MeSH term(s) Animals ; Anti-Infective Agents/chemistry ; Anti-Infective Agents/pharmacology ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Chemokines/chemistry ; Chemokines/pharmacology ; Humans ; Peptide Fragments/chemistry ; Peptide Fragments/pharmacology
    Chemical Substances Anti-Infective Agents ; Antineoplastic Agents ; Chemokines ; Peptide Fragments
    Language English
    Publishing date 2015-06-08
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms160612958
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Guillain-Barre syndrome outbreak in Peru: Association with polymorphisms in IL-17, ICAM1, and CD1.

    Jaramillo-Valverde, Luis / Levano, Kelly S / Villanueva, Isolina / Hidalgo, Meylin / Cornejo, Marco / Mazzetti, Pilar / Cornejo-Olivas, Mario / Sanchez, Cesar / Poterico, Julio A / Valdivia-Silva, Julio / Guio, Heinner

    Molecular genetics & genomic medicine

    2019  Volume 7, Issue 10, Page(s) e00960

    Abstract: Background: Guillain-Barre Syndrome (GBS) is considered a complex disorder with significant environmental effect and genetic susceptibility. Genetic polymorphisms in CD1E, CD1A, IL-17, and/or ICAM1 had been proposed as susceptibility genetic variants ... ...

    Abstract Background: Guillain-Barre Syndrome (GBS) is considered a complex disorder with significant environmental effect and genetic susceptibility. Genetic polymorphisms in CD1E, CD1A, IL-17, and/or ICAM1 had been proposed as susceptibility genetic variants for GBS mainly in Caucasian population. This study explores the association between selected polymorphisms in these genes and GBS susceptibility in confirmed GBS cases reported in mestizo population from northern Peru during the most recent GBS outbreak of May 2018.
    Methods: A total of nine nonrelated cases and 11 controls were sequenced for the polymorphic regions of CD1A, CD1E, IL-17, and ICAM1.
    Results: We found a significant protective association between heterozygous GA genotype in ICAM1 (241Gly/Arg) and GBS (p < .047). IL-17 was monomorphic in both controls and patients. No significant differences were found in the frequency of SNPs in CD1A and CD1E between the group with GBS patients and healthy controls.
    Conclusion: ICAM1 polymorphisms might be considered as potential genetic markers of GBS susceptibility. Further studies with larger sample size will be required to validate these findings.
    MeSH term(s) Aged ; Antigens, CD1/genetics ; Body Mass Index ; Case-Control Studies ; Female ; Genetic Predisposition to Disease ; Genotype ; Guillain-Barre Syndrome/genetics ; Guillain-Barre Syndrome/pathology ; Humans ; Intercellular Adhesion Molecule-1/genetics ; Interleukin-17/genetics ; Male ; Middle Aged ; Peru ; Polymorphism, Single Nucleotide ; Regression Analysis ; Risk Factors
    Chemical Substances Antigens, CD1 ; ICAM1 protein, human ; Interleukin-17 ; Intercellular Adhesion Molecule-1 (126547-89-5)
    Language English
    Publishing date 2019-08-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2734884-2
    ISSN 2324-9269 ; 2324-9269
    ISSN (online) 2324-9269
    ISSN 2324-9269
    DOI 10.1002/mgg3.960
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: Multidisciplinary approach of the hyperarid desert of Pampas de La Joya in southern Peru as a new Mars-like soil analog

    Valdivia-Silva, Julio E / Navarro-González, Rafael / Ortega-Gutierrez, Fernando / Fletcher, Lauren E / Perez-Montaño, Saúl / Condori-Apaza, Reneé / McKay, Christopher P

    Geochimica et cosmochimica acta. 2011 Apr. 1, v. 75, no. 7

    2011  

    Abstract: The distribution of living organisms, organic matter, and chemical properties in Mars-like environments on Earth can be used as a model to guide the investigation of possible habitable environments on Mars. This work aims to demonstrate that the place ... ...

    Abstract The distribution of living organisms, organic matter, and chemical properties in Mars-like environments on Earth can be used as a model to guide the investigation of possible habitable environments on Mars. This work aims to demonstrate that the place known informally as the “Mar de Cuarzo” (Sea of Quartz) in the Pampas de La Joya desert southern Peru (between 16°S and 17°S latitude), contains soils with characteristics similar to those found on the Martian surface. Using a multidisciplinary approach, we studied the environmental data, geology, organic matter content, oxidant activity, and microbiology of this area. Our data show that (1) Mar de Cuarzo is a hyper arid area with a lower concentration of organic matter than those found in the Mars-like soils from Yungay area (Atacama Desert in Chile), while at the same time having, comparable extreme environmental conditions, and very low levels of microorganisms. (2) The detrital components of the soils come essentially from the Andean volcanic chain and local outcrops of Precambrian gneisses and Cretaceous granitic batholiths. (3) The presence of microclimates, geomorphological features, and the high influence of the “El Niño Southern Oscillation (ENSO)” allowed the formation of exotic and heterogeneous chemical deposits in these soils, including iron oxides, sulfates, and other evaporites. (4) Thermal volatilization in these soils (using methods similar to the Viking and Phoenix instruments) shows high oxidant activity. (5) Labeled release experiment (similar to the Viking instrument) shows high degradation of nutrients added in these soils. Altogether, the Mar de Cuarzo area in the Pampas de La Joya is an interesting place for astrobiological studies as a new analog to Mars, and for comparative analyses with other hyperarid analogs as Yungay.
    Keywords El Nino ; environmental factors ; equipment ; geomorphology ; iron oxides ; latitude ; microclimate ; microorganisms ; nutrients ; organic matter ; oxidants ; physicochemical properties ; quartz ; soil ; sulfates ; volatilization ; Chile ; Peru
    Language English
    Dates of publication 2011-0401
    Size p. 1975-1991.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 300305-x
    ISSN 0016-7037
    ISSN 0016-7037
    DOI 10.1016/j.gca.2011.01.017
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  7. Article ; Online: Actin cytoskeleton participation in the onset of IL-1beta induction of an invasive mesenchymal-like phenotype in epithelial MCF-7 cells.

    Franco-Barraza, Janusz / Valdivia-Silva, Julio E / Zamudio-Meza, Horacio / Castillo, Aida / García-Zepeda, Eduardo A / Benítez-Bribiesca, Luis / Meza, Isaura

    Archives of medical research

    2010  Volume 41, Issue 3, Page(s) 170–181

    Abstract: Background: Interleukin 1 beta (IL-1beta) and other inflammatory cytokines are reported to induce phenotypic changes in epithelial breast cancer tumor cells related to increased invasiveness. Mechanisms involved in the process are not well understood.!## ...

    Abstract Background: Interleukin 1 beta (IL-1beta) and other inflammatory cytokines are reported to induce phenotypic changes in epithelial breast cancer tumor cells related to increased invasiveness. Mechanisms involved in the process are not well understood.
    Methods: The noninvasive breast cancer epithelial cell line MCF-7 was used to investigate the IL-1beta-induced phenotype. Live cells expressing EGFP-actin were monitored for cell morphology changes and actin cytoskeleton dynamics by time-lapse video microscopy in the presence of IL-1beta and specific inhibitors of actin signaling pathways. Chemotaxis, invasion of Matrigel, MMP activity and expression of S100A4 in cells treated with IL-1beta were assessed by migration assays, zymograms and immunoblots.
    Results: Exposure to IL-1beta specifically induced a change in MCF-7 cells from a typical epithelial morphology into elongated cells, showing numerous dynamic actin-rich lamellae and peripheral ruffles characteristic of fibroblasts. These cells could scatter from compact cell colonies and respond to chemoattractants such as the homing-associated chemokine CXCL-12. Pharmacological blockage of actin signaling pathways and negative mutants of RhoGTPases revealed that actin reorganization and enhanced motility are regulated via PI3K/Rac 1 activation. IL-1beta-stimulated cells expressed the metastasis promoter S100A4, increased secretion of active MMP-9 and MMP-2 and invasion of extracellular matrix proteins.
    Conclusions: IL-1beta induces a PI3K/Rac 1-regulated reorganization of the actin cytoskeleton of MCF-7 cells that is required for cell scattering, elongation and migration. The enhanced motility is accompanied by expression of protein markers correlated with invasive behavior.
    MeSH term(s) Actins/metabolism ; Breast Neoplasms/metabolism ; Breast Neoplasms/pathology ; Cell Line, Tumor ; Cell Movement/drug effects ; Cell Shape/drug effects ; Cytoskeleton/drug effects ; Cytoskeleton/metabolism ; Epithelial Cells/drug effects ; Epithelial Cells/metabolism ; Epithelial Cells/pathology ; Female ; Humans ; Interleukin-1beta/metabolism ; Interleukin-1beta/pharmacology ; Mesoderm/drug effects ; Mesoderm/metabolism ; Mesoderm/pathology ; Microscopy, Video ; Neoplasm Invasiveness/pathology ; Phenotype ; Phosphatidylinositol 3-Kinases/metabolism ; Receptors, CXCR4/metabolism ; Receptors, Interleukin-1 Type I/metabolism ; Recombinant Proteins/pharmacology ; Signal Transduction ; rac1 GTP-Binding Protein/metabolism
    Chemical Substances Actins ; CXCR4 protein, human ; IL1R1 protein, human ; Interleukin-1beta ; RAC1 protein, human ; Receptors, CXCR4 ; Receptors, Interleukin-1 Type I ; Recombinant Proteins ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; rac1 GTP-Binding Protein (EC 3.6.5.2)
    Language English
    Publishing date 2010-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1156844-6
    ISSN 1873-5487 ; 0188-4409 ; 0188-0128
    ISSN (online) 1873-5487
    ISSN 0188-4409 ; 0188-0128
    DOI 10.1016/j.arcmed.2010.04.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Effect of pro-inflammatory cytokine stimulation on human breast cancer: implications of chemokine receptor expression in cancer metastasis.

    Valdivia-Silva, Julio E / Franco-Barraza, Janusz / Silva, Ana Luisa Esparza / Pont, Gisela Du / Soldevila, Gloria / Meza, Isaura / García-Zepeda, Eduardo A

    Cancer letters

    2009  Volume 283, Issue 2, Page(s) 176–185

    Abstract: Interactions between tumour cells and microenvironments may affect their growth and metastasis formation. In search for a better understanding of the role of cellular mediators in the progression of cancer, we investigated the effect of pro-inflammatory ... ...

    Abstract Interactions between tumour cells and microenvironments may affect their growth and metastasis formation. In search for a better understanding of the role of cellular mediators in the progression of cancer, we investigated the effect of pro-inflammatory cytokines IL-1, IL-6, TNF-alpha and IFN-gamma on the regulation of expression of chemokine receptors CXCR4, CXCR2, CX3CR1, CCR9, and CCR5 in the human breast cancer cell line MCF-7. Our results showed that IL-1 increased CXCR4 expression whereas TNF-alpha increased CX3CR1, CCR9 and CCR5. Interestingly, this regulation was not homogeneous, emphasizing the inherent heterogeneity in cancer that may be responsive to specific inflammatory microenvironments.
    MeSH term(s) Breast Neoplasms/immunology ; Breast Neoplasms/pathology ; Cell Line, Tumor ; Chemotaxis/immunology ; Cytokines/immunology ; Female ; Flow Cytometry ; Humans ; Neoplasm Metastasis/immunology ; RNA, Messenger/analysis ; Receptors, Chemokine/biosynthesis ; Reverse Transcriptase Polymerase Chain Reaction
    Chemical Substances Cytokines ; RNA, Messenger ; Receptors, Chemokine
    Language English
    Publishing date 2009-10-08
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 195674-7
    ISSN 1872-7980 ; 0304-3835
    ISSN (online) 1872-7980
    ISSN 0304-3835
    DOI 10.1016/j.canlet.2009.03.040
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Determination of low bacterial concentrations in hyperarid Atacama soils: comparison of biochemical and microscopy methods with real-time quantitative PCR.

    Fletcher, Lauren E / Conley, Catharine A / Valdivia-Silva, Julio E / Perez-Montaño, Saul / Condori-Apaza, Renee / Kovacs, Gregory T A / Glavin, Daniel P / McKay, Christopher P

    Canadian journal of microbiology

    2011  Volume 57, Issue 11, Page(s) 953–963

    Abstract: Hyperarid Atacama soils are reported to contain significantly reduced numbers of microbes per gram of soil relative to soils from other environments. Molecular methods have been used to evaluate microbial populations in hyperarid Atacama soils; however, ... ...

    Abstract Hyperarid Atacama soils are reported to contain significantly reduced numbers of microbes per gram of soil relative to soils from other environments. Molecular methods have been used to evaluate microbial populations in hyperarid Atacama soils; however, conflicting results across the various studies, possibly caused by this low number of microorganisms and consequent biomass, suggest that knowledge of expected DNA concentrations in these soils becomes important to interpreting data from any method regarding microbial concentrations and diversity. In this paper we compare the number of bacteria per gram of Atacama Desert soils determined by real-time quantitative polymerase chain reaction with the number of bacteria estimated by the standard methods of phospholipids fatty acid analysis, adenine composition (determined by liquid chromatography - time-of-flight mass spectrometry), and SYBR-green microscopy. The number determined by real-time quantitative polymerase chain reaction as implemented in this study was several orders of magnitude lower than that determined by the other three methods and probably underestimates the concentrations of soil bacteria, most likely because of soil binding during the DNA extraction methods. However, the other methods very possibly overestimate the bacteria concentrations owing to desiccated, intact organisms, which would stain positive in microscopy and preserve both adenine and phospholipid fatty acid for the other methods.
    MeSH term(s) Bacteria/chemistry ; Bacteria/genetics ; Bacterial Load/methods ; Bacterial Physiological Phenomena ; Biochemistry ; Biomass ; Desert Climate ; Environmental Monitoring/methods ; Fatty Acids/analysis ; Microscopy ; Phospholipids/analysis ; Real-Time Polymerase Chain Reaction ; Soil/chemistry ; Soil Microbiology
    Chemical Substances Fatty Acids ; Phospholipids ; Soil
    Language English
    Publishing date 2011-11
    Publishing country Canada
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280534-0
    ISSN 1480-3275 ; 0008-4166
    ISSN (online) 1480-3275
    ISSN 0008-4166
    DOI 10.1139/w11-091
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Multidisciplinary approach of the hyperarid desert of Pampas de La Joya in southern Peru as a new Mars-like soil analog

    Valdivia-Silva, Julio E. / Navarro-González, Rafael / Ortega-Gutierrez, Fernando / Fletcher, Lauren E. / Perez-Montaño, Saúl / Condori-Apaza, Reneé / McKay, Christopher P.

    Geochimica et cosmochimica acta

    Volume v. 75,, Issue no. 7

    Abstract: The distribution of living organisms, organic matter, and chemical properties in Mars-like environments on Earth can be used as a model to guide the investigation of possible habitable environments on Mars. This work aims to demonstrate that the place ... ...

    Abstract The distribution of living organisms, organic matter, and chemical properties in Mars-like environments on Earth can be used as a model to guide the investigation of possible habitable environments on Mars. This work aims to demonstrate that the place known informally as the “Mar de Cuarzo” (Sea of Quartz) in the Pampas de La Joya desert southern Peru (between 16°S and 17°S latitude), contains soils with characteristics similar to those found on the Martian surface. Using a multidisciplinary approach, we studied the environmental data, geology, organic matter content, oxidant activity, and microbiology of this area. Our data show that (1) Mar de Cuarzo is a hyper arid area with a lower concentration of organic matter than those found in the Mars-like soils from Yungay area (Atacama Desert in Chile), while at the same time having, comparable extreme environmental conditions, and very low levels of microorganisms. (2) The detrital components of the soils come essentially from the Andean volcanic chain and local outcrops of Precambrian gneisses and Cretaceous granitic batholiths. (3) The presence of microclimates, geomorphological features, and the high influence of the “El Niño Southern Oscillation (ENSO)” allowed the formation of exotic and heterogeneous chemical deposits in these soils, including iron oxides, sulfates, and other evaporites. (4) Thermal volatilization in these soils (using methods similar to the Viking and Phoenix instruments) shows high oxidant activity. (5) Labeled release experiment (similar to the Viking instrument) shows high degradation of nutrients added in these soils. Altogether, the Mar de Cuarzo area in the Pampas de La Joya is an interesting place for astrobiological studies as a new analog to Mars, and for comparative analyses with other hyperarid analogs as Yungay.
    Keywords environmental factors ; iron oxides ; sulfates ; physicochemical properties ; equipment ; microclimate ; organic matter ; nutrients ; oxidants ; volatilization ; El Nino ; quartz ; geomorphology ; latitude ; soil ; microorganisms
    Language English
    Document type Article
    ISSN 0016-7037
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

    More links

    Kategorien

To top