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  1. Article: A Systematic Review of Gene Expression Studies in Critically Ill Patients with Sepsis and Community-Acquired Pneumonia.

    Viasus, Diego / Nonell, Lara / Restrepo, Carlos / Figueroa, Fabian / Donado-Mazarrón, Carla / Carratalà, Jordi

    Biomedicines

    2023  Volume 11, Issue 10

    Abstract: 1) Background: Sepsis is present in nearly 90% of critically ill patients with community-acquired pneumonia (CAP). This systematic review updates the information on studies that have assessed gene expression profiles in critically ill septic patients ... ...

    Abstract (1) Background: Sepsis is present in nearly 90% of critically ill patients with community-acquired pneumonia (CAP). This systematic review updates the information on studies that have assessed gene expression profiles in critically ill septic patients with CAP. (2) Methods: We searched for studies that satisfied the following criteria: (a) expression profile in critically ill patients with sepsis due to CAP, (b) presence of a control group, and (c) adult patients. Over-representation analysis was performed with clusterProfiler using the Hallmark and Reactome collections. (3) Results: A total of 4312 differentially expressed genes (DEGs) and sRNAs were included in the enrichment analysis. In the Hallmark collection, genes regulated by nuclear factor kappa B in response to tumor necrosis factor, genes upregulated by signal transducer and activator of transcription 5 in response to interleukin 2 stimulation, genes upregulated in response to interferon-gamma, genes defining the inflammatory response, a subgroup of genes regulated by MYC-version 1 (v1), and genes upregulated during transplant rejection were significantly enriched in critically ill septic patients with CAP. Moreover, 88 pathways were identified in the Reactome database. (4) Conclusions: This study summarizes the reported DEGs in critically ill septic patients with CAP and investigates their functional implications. The results highlight the complexity of immune responses during CAP.
    Language English
    Publishing date 2023-10-11
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2720867-9
    ISSN 2227-9059
    ISSN 2227-9059
    DOI 10.3390/biomedicines11102755
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: In vitro

    Torres, Solange / Figueroa, Fabián / Casas Arrojo, Virginia / Riquelme, Cristian / Astuya, Allisson / Abdala-Díaz, Roberto T / Becerra, José / Rajchenberg, Mario / Pildain, María Belén / Baltazar, Juliano Marcon / Cabrera-Pardo, Jaime R / Pérez, Claudia

    Natural product research

    2024  , Page(s) 1–6

    Abstract: Polysaccharides from wood-rooting fungi have attracted attention due to their broad pharmacological properties. Herein, we report the antitumor and immunomodulatory activities of acid polysaccharides isolated from ... ...

    Abstract Polysaccharides from wood-rooting fungi have attracted attention due to their broad pharmacological properties. Herein, we report the antitumor and immunomodulatory activities of acid polysaccharides isolated from fungi
    Language English
    Publishing date 2024-04-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 2185747-7
    ISSN 1478-6427 ; 1478-6419
    ISSN (online) 1478-6427
    ISSN 1478-6419
    DOI 10.1080/14786419.2024.2335351
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Sulfated Polysaccharide Extracted from the Green Algae Codium bernabei: Physicochemical Characterization and Antioxidant, Anticoagulant and Antitumor Activity

    Figueroa, Fabian A. / Abdala-Díaz, Roberto T. / Pérez, Claudia / Casas-Arrojo, Virginia / Nesic, Aleksandra / Tapia, Cecilia / Durán, Carla / Valdes, Oscar / Parra, Carolina / Bravo-Arrepol, Gastón / Soto, Luis / Becerra, José / Cabrera-Barjas, Gustavo

    Marine drugs. 2022 July 15, v. 20, no. 7

    2022  

    Abstract: Codium bernabei is a green alga that grows on Chilean coasts. The composition of its structural polysaccharides is still unknown. Hence, the aim of this work is to isolate and characterize the hot water extracted polysaccharide fractions. For this ... ...

    Abstract Codium bernabei is a green alga that grows on Chilean coasts. The composition of its structural polysaccharides is still unknown. Hence, the aim of this work is to isolate and characterize the hot water extracted polysaccharide fractions. For this purpose, the water extracts were further precipitated in alcohol (TPs) and acid media (APs), respectively. Both fractions were characterized using different physicochemical techniques such as GC-MS, GPC, FTIR, TGA, and SEM. It is confirmed that the extracted fractions are mainly made of sulfated galactan unit, with a degree of sulfation of 19.3% (TPs) and 17.4% (ATs) and a protein content of 3.5% in APs and 15.6% in TPs. Other neutral sugars such as xylose, glucose, galactose, fucose, mannose, and arabinose were found in a molar ratio (0.05:0.6:1.0:0.02:0.14:0.11) for TPs and (0.05:0.31:1.0:0.03:0.1:0.13) for ATs. The molecular weight of the polysaccharide samples was lower than 20 kDa. Both polysaccharides were thermally stable (Tonset > 190 °C) and showed antioxidant activity according to the ABTS•⁺ and DPPH tests, where TPs fractions had higher scavenging activity (35%) compared to the APs fractions. The PT and APTTS assays were used to measure the anticoagulant activity of the polysaccharide fractions. In general, the PT activity of the TPs and APs was not different from normal plasma values. The exception was the TPs treatment at 1000 µg mL⁻¹ concentration. The APTTS test revealed that clotting time for both polysaccharides was prolonged regarding normal values at 1000 µg mL⁻¹. Finally, the antitumor test in colorectal carcinoma (HTC-116) cell line, breast cancer (MCF-7) and human leukemia (HL-60) cell lines showed the cytotoxic effect of TPs and APs. Those results suggest the potential biotechnological application of sulfate galactan polysaccharides isolated from a Chilean marine resource.
    Keywords Codium ; anticoagulant activity ; anticoagulants ; antineoplastic activity ; antioxidant activity ; antioxidants ; arabinose ; breast neoplasms ; cell lines ; colorectal neoplasms ; cytotoxicity ; fucose ; galactose ; glucose ; humans ; leukemia ; mannose ; marine resources ; molecular weight ; polysaccharides ; protein content ; sulfates ; thermal stability ; xylose
    Language English
    Dates of publication 2022-0715
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2175190-0
    ISSN 1660-3397
    ISSN 1660-3397
    DOI 10.3390/md20070458
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: In vitro

    Albornoz, Verónica / Casas-Arrojo, Virginia / Figueroa, Fabián / Riquelme, Cristian / Hernández, Víctor / Rajchenberg, Mario / Smith, Carlos T / Campos, Víctor L / Abdala-Díaz, Roberto T / Becerra, José / Pérez, Claudia / Cabrera-Pardo, Jaime R

    Natural product research

    2022  Volume 37, Issue 24, Page(s) 4274–4279

    Abstract: Fungal polysaccharides possess a broad biological activity, including cytotoxic and antioxidant activities. This work aimed to evaluate the cytotoxic and antioxidant activity of the acidic polysaccharides ... ...

    Abstract Fungal polysaccharides possess a broad biological activity, including cytotoxic and antioxidant activities. This work aimed to evaluate the cytotoxic and antioxidant activity of the acidic polysaccharides of
    MeSH term(s) Antioxidants/pharmacology ; Spectroscopy, Fourier Transform Infrared ; Basidiomycota ; Cell Line, Tumor ; Polysaccharides/pharmacology ; Antineoplastic Agents/pharmacology
    Chemical Substances Antioxidants ; Polysaccharides ; Antineoplastic Agents
    Language English
    Publishing date 2022-12-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2185747-7
    ISSN 1478-6427 ; 1478-6419
    ISSN (online) 1478-6427
    ISSN 1478-6419
    DOI 10.1080/14786419.2022.2158331
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Sulfated Polysaccharide Extracted from the Green Algae

    Figueroa, Fabian A / Abdala-Díaz, Roberto T / Pérez, Claudia / Casas-Arrojo, Virginia / Nesic, Aleksandra / Tapia, Cecilia / Durán, Carla / Valdes, Oscar / Parra, Carolina / Bravo-Arrepol, Gastón / Soto, Luis / Becerra, José / Cabrera-Barjas, Gustavo

    Marine drugs

    2022  Volume 20, Issue 7

    Abstract: Codium bernabei is a green alga that grows on Chilean coasts. The composition of its structural polysaccharides is still unknown. Hence, the aim of this work is to isolate and characterize the hot water extracted polysaccharide fractions. For this ... ...

    Abstract Codium bernabei is a green alga that grows on Chilean coasts. The composition of its structural polysaccharides is still unknown. Hence, the aim of this work is to isolate and characterize the hot water extracted polysaccharide fractions. For this purpose, the water extracts were further precipitated in alcohol (TPs) and acid media (APs), respectively. Both fractions were characterized using different physicochemical techniques such as GC-MS, GPC, FTIR, TGA, and SEM. It is confirmed that the extracted fractions are mainly made of sulfated galactan unit, with a degree of sulfation of 19.3% (TPs) and 17.4% (ATs) and a protein content of 3.5% in APs and 15.6% in TPs. Other neutral sugars such as xylose, glucose, galactose, fucose, mannose, and arabinose were found in a molar ratio (0.05:0.6:1.0:0.02:0.14:0.11) for TPs and (0.05:0.31:1.0:0.03:0.1:0.13) for ATs. The molecular weight of the polysaccharide samples was lower than 20 kDa. Both polysaccharides were thermally stable (Tonset > 190 °C) and showed antioxidant activity according to the ABTS•+ and DPPH tests, where TPs fractions had higher scavenging activity (35%) compared to the APs fractions. The PT and APTTS assays were used to measure the anticoagulant activity of the polysaccharide fractions. In general, the PT activity of the TPs and APs was not different from normal plasma values. The exception was the TPs treatment at 1000 µg mL−1 concentration. The APTTS test revealed that clotting time for both polysaccharides was prolonged regarding normal values at 1000 µg mL−1. Finally, the antitumor test in colorectal carcinoma (HTC-116) cell line, breast cancer (MCF-7) and human leukemia (HL-60) cell lines showed the cytotoxic effect of TPs and APs. Those results suggest the potential biotechnological application of sulfate galactan polysaccharides isolated from a Chilean marine resource.
    MeSH term(s) Anticoagulants/chemistry ; Antioxidants/pharmacology ; Chlorophyta/chemistry ; Galactans/chemistry ; Humans ; Polysaccharides/chemistry ; Sulfates/chemistry ; Water
    Chemical Substances Anticoagulants ; Antioxidants ; Galactans ; Polysaccharides ; Sulfates ; Water (059QF0KO0R)
    Language English
    Publishing date 2022-07-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2175190-0
    ISSN 1660-3397 ; 1660-3397
    ISSN (online) 1660-3397
    ISSN 1660-3397
    DOI 10.3390/md20070458
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Diarrheagenic Escherichia coli pathotypes isolated from a swine farm in a region of Morelos state, Mexico.

    Tamayo-Legorreta, Elsa María / García-Radilla, Alejandro / Moreno-Vázquez, Eduardo / Téllez-Figueroa, Fabián / Alpuche-Aranda, Celia M

    Salud publica de Mexico

    2020  Volume 63, Issue 1, ene-feb, Page(s) 34–41

    Abstract: Objective: Determine the frequency of diarrheagenic Escherichia coli pathotypes colonizing swine.: Materials and methods: E. coli strains isolated of fecal samples from 280 swine, produced for local consumption, in a semi-technical farm of Morelos ... ...

    Abstract Objective: Determine the frequency of diarrheagenic Escherichia coli pathotypes colonizing swine.
    Materials and methods: E. coli strains isolated of fecal samples from 280 swine, produced for local consumption, in a semi-technical farm of Morelos state, (central Mexico) were tested to identify the diarrheagenic E. coli pathotypes by multiplex PCR.
    Results: Of the 521-diarrheagenic E. coli isolates examined, 50 (9.6%) were positive for at least one virulence gene in 42 different animals. Thus, 15% (42/280) of the swine in this farm were colonized with pathogenic E. coli. Among the E. coli isolates, the pathotype EPEC (6.5%) was the most frequently, followed by EHEC (2.3%), ETEC and EIEC (0.4%).
    Conclusions: In this study, four different E. coli pathotypes were found among swine colonized by E. coli in this farm. Thus, these swine are reservoirs for these virulent bacteria and there is potential risk of causing diarrhea in swine and in the population consuming the meat.
    MeSH term(s) Animals ; Diarrhea/epidemiology ; Diarrhea/veterinary ; Escherichia coli/classification ; Escherichia coli/isolation & purification ; Escherichia coli Infections/epidemiology ; Escherichia coli Infections/veterinary ; Farms ; Mexico/epidemiology ; Swine ; Virulence Factors
    Chemical Substances Virulence Factors
    Language English
    Publishing date 2020-12-22
    Publishing country Mexico
    Document type Journal Article
    ZDB-ID 954220-6
    ISSN 1606-7916 ; 0036-3634
    ISSN (online) 1606-7916
    ISSN 0036-3634
    DOI 10.21149/11268
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Invasive diatom Didymosphenia geminata as a source of polysaccharides with antioxidant and immunomodulatory effects on macrophage cell lines

    Figueroa, Fabián A / Abdala-Díaz, Roberto / Hernández, Víctor / Pedreros, Pablo / Aranda, Mario / Cabrera-Pardo, Jaime R / Pérez, Claudia / Becerra, José / Urrutia, Roberto

    Journal of applied phycology. 2020 Feb., v. 32, no. 1

    2020  

    Abstract: This study addresses for the first time the chemistry and biological activity of polysaccharides isolated from Didymosphenia geminata. Fourier-transform infrared spectroscopy (FTIR) and high-performance thin-layer chromatography (HPTLC) techniques were ... ...

    Abstract This study addresses for the first time the chemistry and biological activity of polysaccharides isolated from Didymosphenia geminata. Fourier-transform infrared spectroscopy (FTIR) and high-performance thin-layer chromatography (HPTLC) techniques were used to characterize the crude and acidic polysaccharides of D. geminata; galactose and xylose were found to be the main monomer components. The antioxidant activity as well as the effect on the expression of IL-6 and TNF-α in RAW 264.7 murine cell lines were determined for both types of polysaccharides. The antioxidant activity of crude polysaccharides proved to be stronger than acidic polysaccharides by means of quenching experiments of ABTS·+ and Trolox equivalent antioxidant capacity (TEAC) (p < 0.05). Crude polysaccharides induced an increase in both IL-6 and TNF-α contents. Acidic polysaccharides produced a similar effect on these cytokines, but to a lesser extent. These results suggest that polysaccharides from D. geminata could be explored as natural antioxidant and immunomodulatory agents in medicine and the nutraceutical industry. This investigation suggests an opportunity to turn the invasive mats of D. geminata, which currently cause environmental problems, into a source of polysaccharides with nutraceutical application.
    Keywords Didymosphenia geminata ; Fourier transform infrared spectroscopy ; antioxidant activity ; antioxidants ; cell lines ; dietary supplements ; galactose ; immunomodulators ; industry ; interleukin-6 ; macrophages ; medicine ; mice ; polysaccharides ; thin layer chromatography ; tumor necrosis factor-alpha ; xylose
    Language English
    Dates of publication 2020-02
    Size p. 93-102.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1002324-0
    ISSN 1573-5176 ; 0921-8971
    ISSN (online) 1573-5176
    ISSN 0921-8971
    DOI 10.1007/s10811-019-01976-6
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Effect of Didymosphenia geminata coverage on the phytobenthic community in an Andean basin of Chile

    Figueroa, Fabián / Pablo Pedreros / Fabiola Cruces / Roberto Abdala-Díaz / Víctor Hernández / José Becerra / Roberto Urrutia

    Revista chilena de historia natural. 2018 Dec., v. 91, no. 1

    2018  

    Abstract: BACKGROUND: The invasive diatom Didymosphenia geminata (Lyngbye) M. Schmidt has received considerable attention in recent years due to its rapid geographic expansion and massive proliferation, which have altered habitat availability for benthic species ... ...

    Abstract BACKGROUND: The invasive diatom Didymosphenia geminata (Lyngbye) M. Schmidt has received considerable attention in recent years due to its rapid geographic expansion and massive proliferation, which have altered habitat availability for benthic species and triggered negative effects on stream ecosystems. We evaluated the changes in the community structure of phytobenthos caused by the temporal variation in D. geminata coverage, in addition to the environmental variables correlated with the temporal variation of this invasive microalga in the Andean sector of the Biobio River basin, Chile. METHODS: Environmental parameters were measured during the austral summer of 2014–2015, when phytobenthos samples were collected and used to develop a relative abundance matrix of taxa by calculating species richness and Shannon diversity. Multivariate techniques were used to establish the relationships among environmental variables, including D. geminata coverage, and the phytobenthic community. RESULTS: Massive proliferation of D. geminata occurs during summer (December–January). According to multiple regression analysis, electrical conductivity, temperature and total phosphorus were the variables that best explained the variation in D. geminata coverage. When D. geminata coverage was over 50%, phytobenthic species richness was significantly higher than at the uninvaded site, without a significant change in Shannon diversity. In addition, the % coverage of this invasive microalga and total phosphorus concentration were variables that differentiated phytobenthic communities among the study sites. CONCLUSIONS: Environmental factors such as conductivity, temperature and total phosphorus concentration influenced the temporal variability of D. geminata mats. In addition, the massive growth of this invasive diatom caused a higher species richness without altering Shannon diversity. Our results suggest that the spatio-temporal variability of D. geminata correlated with environmental variables will help predict the habitat suitability of this alga in other Andean rivers and allow a better understanding of ecological habitat alterations.
    Keywords Didymosphenia geminata ; basins ; benthic organisms ; ecosystems ; electrical conductivity ; environmental factors ; habitat destruction ; habitats ; microalgae ; regression analysis ; rivers ; species richness ; streams ; summer ; temperature ; temporal variation ; total phosphorus ; watersheds ; Andes region ; Chile
    Language English
    Dates of publication 2018-12
    Size p. 10.
    Publishing place BioMed Central
    Document type Article
    ZDB-ID 2091358-8
    ISSN 0717-6317 ; 0716-078X
    ISSN (online) 0717-6317
    ISSN 0716-078X
    DOI 10.1186/s40693-018-0080-y
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: N

    Figueroa, Fabian / Vega-Gibson, Alonso / Catrileo, Joseline / Gaete-Argel, Aracelly / Riquelme-Barrios, Sebastian / Alonso-Palomares, Luis Antonio / Tapia, Lorena I / Valiente-Echeverría, Fernando / Soto-Rifo, Ricardo / Acevedo, Monica L

    Frontiers in cell and developmental biology

    2021  Volume 9, Page(s) 739445

    Abstract: ... ...

    Abstract N
    Language English
    Publishing date 2021-10-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2737824-X
    ISSN 2296-634X
    ISSN 2296-634X
    DOI 10.3389/fcell.2021.739445
    Database MEDical Literature Analysis and Retrieval System OnLINE

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