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  1. Article ; Online: Substantial Diversity in Cocirculating Omicron Lineages in Hospital Setting, Porto Alegre, Brazil.

    Andreis, Tiago F / Cantarelli, Vlademir V / da Silva, Marcelo B / Helfer, Mateus S / Brust, Flávia R / Zavascki, Alexandre P

    Emerging infectious diseases

    2023  Volume 29, Issue 12, Page(s) 2583–2586

    Abstract: We describe substantial variant diversity among 23 detected SARS-CoV-2 Omicron lineage viruses cocirculating among healthcare workers and inpatients (272 sequenced samples) from Porto Alegre, Brazil, during November 2022-January 2023. BQ.1 and related ... ...

    Abstract We describe substantial variant diversity among 23 detected SARS-CoV-2 Omicron lineage viruses cocirculating among healthcare workers and inpatients (272 sequenced samples) from Porto Alegre, Brazil, during November 2022-January 2023. BQ.1 and related lineages (61.4%) were most common, followed by BE.9 (19.1%), first described in November 2022 in the Amazon region.
    MeSH term(s) Humans ; Brazil/epidemiology ; Health Personnel ; Hospitals ; Inpatients ; SARS-CoV-2
    Language English
    Publishing date 2023-11-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2912.230880
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Validation of a MALDI-TOF MS Method for SARS-CoV-2 Detection on the Bruker Biotyper and Nasopharyngeal Swabs: A Brazil-UK Collaborative Study.

    Lovison, Otávio A / Grigaitė, Raminta / Volpato, Fabiana C Z / Iles, Jason K / Lacey, Jon / Barreto, Fabiano / Pandiri, Sai R / Balzan, Lisiane da Luz R / Cantarelli, Vlademir V / Barth, Afonso Luis / Iles, Ray K / Martins, Andreza F

    Diagnostics (Basel, Switzerland)

    2023  Volume 13, Issue 8

    Abstract: We developed a MALDI-TOF mass spectrometry method for the detection of the SARS-CoV-2 virus in saliva-gargle samples using Shimadzu MALDI-TOF mass spectrometers in the UK. This was validated in the USA to CLIA-LDT standards for asymptomatic infection ... ...

    Abstract We developed a MALDI-TOF mass spectrometry method for the detection of the SARS-CoV-2 virus in saliva-gargle samples using Shimadzu MALDI-TOF mass spectrometers in the UK. This was validated in the USA to CLIA-LDT standards for asymptomatic infection detection remotely via sharing protocols, shipping key reagents, video conferencing, and data exchange. In Brazil, more so than in the UK and USA, there is a need to develop non-PCR-dependent, rapid, and affordable SARS-CoV-2 infection screening tests that also identify variant SARS-CoV-2 and other virus infections. In addition, travel restrictions necessitated remote collaboration with validation on the available clinical MALDI-TOF-the Bruker Biotyper (microflex
    Language English
    Publishing date 2023-04-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics13081470
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Occurrence of Infected Free-Living Amoebae in Cooling Towers of Southern Brazil.

    Soares, Scheila S / Souza, Thamires K / Berté, Francisco K / Cantarelli, Vlademir V / Rott, Marilise B

    Current microbiology

    2017  Volume 74, Issue 12, Page(s) 1461–1468

    Abstract: This study determined the occurrence of potentially pathogenic free-living amoebae (FLA) and bacteria associated with amoebae in air-conditioning cooling towers in southern Brazil. Water samples were collected from 36 cooling systems from air- ... ...

    Abstract This study determined the occurrence of potentially pathogenic free-living amoebae (FLA) and bacteria associated with amoebae in air-conditioning cooling towers in southern Brazil. Water samples were collected from 36 cooling systems from air-conditioning in the state of Rio Grande do Sul, Brazil. The organisms were identified using polymerase chain reaction (PCR) and sequencing automated. The results showed that these aquatic environments, with variable temperature, are potential "hot spots" for emerging human pathogens like free-living amoebae and bacteria associated. In total, 92% of the cooling-tower samples analyzed were positive for FLA, and Acanthamoeba was the dominant genus by culture and PCR. Amoebal isolates revealed intracellular bacteria in 39.3% of them and all were confirmed as members of the genus Pseudomonas. The results obtained show the important role of cooling towers as a source of amoebae-associated pathogens.
    Language English
    Publishing date 2017-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 134238-1
    ISSN 1432-0991 ; 0343-8651
    ISSN (online) 1432-0991
    ISSN 0343-8651
    DOI 10.1007/s00284-017-1341-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Direct detection of bla(OXA-23) gene from endotracheal aspirates by real time PCR.

    Brust, Flávia R / Massi, Lisandra / Cantarelli, Vlademir V / Zavascki, Alexandre P

    The Brazilian journal of infectious diseases : an official publication of the Brazilian Society of Infectious Diseases

    2013  Volume 17, Issue 4, Page(s) 493–494

    MeSH term(s) Acinetobacter Infections/diagnosis ; Acinetobacter Infections/microbiology ; Acinetobacter baumannii/enzymology ; DNA, Bacterial/genetics ; Humans ; Real-Time Polymerase Chain Reaction ; Trachea/microbiology ; beta-Lactam Resistance/genetics ; beta-Lactamases/genetics
    Chemical Substances DNA, Bacterial ; beta-lactamase OXA-23 (EC 3.5.2.-) ; beta-Lactamases (EC 3.5.2.6)
    Language English
    Publishing date 2013-05-09
    Publishing country Brazil
    Document type Letter ; Research Support, Non-U.S. Gov't
    ZDB-ID 2041400-6
    ISSN 1678-4391 ; 1413-8670
    ISSN (online) 1678-4391
    ISSN 1413-8670
    DOI 10.1016/j.bjid.2012.11.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Pertussis: a re-emerging or under diagnosed infectious disease?

    Cantarelli, Vlademir V / Hoffmann, Elias R / Fitarelli, Douglas B / Comerlato, Liriane / Baungarten, Cláudio C

    The Brazilian journal of infectious diseases : an official publication of the Brazilian Society of Infectious Diseases

    2013  Volume 17, Issue 3, Page(s) 385–386

    MeSH term(s) Bordetella pertussis/isolation & purification ; Brazil ; Carrier State ; Child ; Child, Preschool ; Communicable Diseases, Emerging/diagnosis ; Communicable Diseases, Emerging/microbiology ; Humans ; Infant ; Infant, Newborn ; Nasopharynx/microbiology ; Polymerase Chain Reaction ; Whooping Cough/diagnosis
    Language English
    Publishing date 2013-04-19
    Publishing country Brazil
    Document type Letter
    ZDB-ID 2041400-6
    ISSN 1678-4391 ; 1413-8670
    ISSN (online) 1678-4391
    ISSN 1413-8670
    DOI 10.1016/j.bjid.2012.11.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Aeromonas hydrophila PepO outer membrane endopeptidase activates human big endothelin-3 in vitro and induces skin ulcer in goldfish (Carassius auratus)

    Abolghait, Said Kamal / Akeda, Yukihiro / Kodama, Toshio / Cantarelli, Vlademir V / Iida, Tetsuya / Honda, Takeshi

    Veterinary microbiology. 2010 Sept. 28, v. 145, no. 1-2

    2010  

    Abstract: In Aeromonas hydrophila, the gram-negative bacterial fish pathogen, PepO constitutes the thermoregulated outer membrane M13 family zinc endopeptidase, which is expressed maximally at 16°C and is down-regulated above 30°C. Cultivation of A. hydrophila at ... ...

    Abstract In Aeromonas hydrophila, the gram-negative bacterial fish pathogen, PepO constitutes the thermoregulated outer membrane M13 family zinc endopeptidase, which is expressed maximally at 16°C and is down-regulated above 30°C. Cultivation of A. hydrophila at 16°C enabled it to activate big endothelin (ET), the vasoconstrictor and ulcerogenic peptide naturally secreted from human vascular endothelial cell (HUVEC) culture. Furthermore, A. hydrophila PepO in vitro shows strong enzymatic preference for human big ET-3 rather than big ET-1 and big ET-2. At water temperature of 16±1°C, intramuscular infection of goldfish, Carassius auratus, with wild-type A. hydrophila led to development of a pathognomonic big ulcer at the injection site while the PepO deficient mutant strain lost both its big ET endopeptidase activity in vitro as well as its ulcerogenic property in vivo. This is the first report of expression, subcellular localization and functional analysis of PepO metalloendopeptidase in A. hydrophila.
    Keywords goldfish ; Carassius auratus ; Aeromonas hydrophila ; bacterial infections ; fish diseases ; cell membranes ; outer membrane proteins ; proteinases ; enzyme activity ; gene expression regulation ; endothelins ; vasoconstrictor agents ; skin lesions ; water temperature ; metalloproteinases ; cytochemistry
    Language English
    Dates of publication 2010-0928
    Size p. 113-121.
    Publishing place Amsterdam; New York: Elsevier
    Document type Article
    ZDB-ID 753154-0
    ISSN 1873-2542 ; 0378-1135
    ISSN (online) 1873-2542
    ISSN 0378-1135
    DOI 10.1016/j.vetmic.2010.03.009
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Recombinant AexU effector protein of Aeromonas veronii bv. sobria disrupts the actin cytoskeleton by downregulation of Rac1 and induces direct cytotoxicity to β4-integrin expressing cell lines.

    Abolghait, Said Kamal / Iida, Tetsuya / Kodama, Toshio / Cantarelli, Vlademir V / Akeda, Yukihiro / Honda, Takeshi

    Microbial pathogenesis

    2011  Volume 51, Issue 6, Page(s) 454–465

    Abstract: AexU is a type three secretion system (TTSS) effector of Aeromonas hydrophila which has an in vitro ADP-ribosyltransferase (ART) and GTPase-activating protein (GAP) activities on Rac1, RhoA and Cdc42. Here we show that, AexU of Aeromonas veronii bv. ... ...

    Abstract AexU is a type three secretion system (TTSS) effector of Aeromonas hydrophila which has an in vitro ADP-ribosyltransferase (ART) and GTPase-activating protein (GAP) activities on Rac1, RhoA and Cdc42. Here we show that, AexU of Aeromonas veronii bv. sobria AeG1 strain disrupts actin cytoskeleton of HeLa cells during AeG1 infection, aexU transfection or direct application of AexU protein. Such cellular disruption was rescued by either inactivation of AexU-GAP activity by substitution of arginine residue 143 to alanine or expression of a constitutively active (CA) Rac1 but not CA RhoA or CA Cdc42. On the other hand, AexU was found co-localized with β4-integrin probably through its Arg-Gly-Asp (RGD) integrin binding motif (319-321) residues. Interestingly, direct application of GST-AexU-HA fusion protein caused significant cytotoxic effect on β4-integrin expressing HT-29 cells. In contrast, β4-integrin blockade with a specific antibody reduced such cytotoxicity. Consequently, AexU cytotoxic effect was exaggerated with a greater expression of β4-integrin in Caco-2 and HeLa cells, while it was incompetent on β4-integrin non-expressing CHO cells. As far as we know, this is a novel TTSS effector which specifically inactivates Rac1 to disrupt actin cytoskeleton and has an alternative cytotoxic pathway through β4-integrin mediation.
    MeSH term(s) Actin Cytoskeleton/metabolism ; Aeromonas/metabolism ; Aeromonas/pathogenicity ; Amino Acid Substitution ; Animals ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Cell Line ; Cell Survival/drug effects ; Host-Pathogen Interactions ; Humans ; Integrin beta4/metabolism ; Mutagenesis, Site-Directed ; Mutant Proteins/genetics ; Mutant Proteins/metabolism ; Protein Binding ; Protein Interaction Mapping ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; Virulence Factors/genetics ; Virulence Factors/metabolism ; rac1 GTP-Binding Protein/antagonists & inhibitors
    Chemical Substances Bacterial Proteins ; Integrin beta4 ; Mutant Proteins ; RAC1 protein, human ; Recombinant Proteins ; Virulence Factors ; rac1 GTP-Binding Protein (EC 3.6.5.2)
    Language English
    Publishing date 2011-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632772-2
    ISSN 1096-1208 ; 0882-4010
    ISSN (online) 1096-1208
    ISSN 0882-4010
    DOI 10.1016/j.micpath.2011.09.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Aeromonas hydrophila PepO outer membrane endopeptidase activates human big endothelin-3 in vitro and induces skin ulcer in goldfish (Carassius auratus).

    Abolghait, Said Kamal / Akeda, Yukihiro / Kodama, Toshio / Cantarelli, Vlademir V / Iida, Tetsuya / Honda, Takeshi

    Veterinary microbiology

    2010  Volume 145, Issue 1-2, Page(s) 113–121

    Abstract: In Aeromonas hydrophila, the gram-negative bacterial fish pathogen, PepO constitutes the thermoregulated outer membrane M13 family zinc endopeptidase, which is expressed maximally at 16 degrees C and is down-regulated above 30 degrees C. Cultivation of A. ...

    Abstract In Aeromonas hydrophila, the gram-negative bacterial fish pathogen, PepO constitutes the thermoregulated outer membrane M13 family zinc endopeptidase, which is expressed maximally at 16 degrees C and is down-regulated above 30 degrees C. Cultivation of A. hydrophila at 16 degrees C enabled it to activate big endothelin (ET), the vasoconstrictor and ulcerogenic peptide naturally secreted from human vascular endothelial cell (HUVEC) culture. Furthermore, A. hydrophila PepO in vitro shows strong enzymatic preference for human big ET-3 rather than big ET-1 and big ET-2. At water temperature of 16+/-1 degrees C, intramuscular infection of goldfish, Carassius auratus, with wild-type A. hydrophila led to development of a pathognomonic big ulcer at the injection site while the PepO deficient mutant strain lost both its big ET endopeptidase activity in vitro as well as its ulcerogenic property in vivo. This is the first report of expression, subcellular localization and functional analysis of PepO metalloendopeptidase in A. hydrophila.
    MeSH term(s) Aeromonas hydrophila/enzymology ; Aeromonas hydrophila/genetics ; Aeromonas hydrophila/physiology ; Animals ; Bacterial Outer Membrane Proteins/biosynthesis ; Bacterial Outer Membrane Proteins/genetics ; Bacterial Outer Membrane Proteins/physiology ; Endopeptidases/physiology ; Endothelin-3/biosynthesis ; Fish Diseases/microbiology ; Gene Expression Regulation, Bacterial ; Genes, Bacterial/genetics ; Goldfish/microbiology ; Gram-Negative Bacterial Infections/microbiology ; Gram-Negative Bacterial Infections/veterinary ; In Vitro Techniques ; Molecular Sequence Data ; Proteomics ; Skin Ulcer/microbiology ; Skin Ulcer/veterinary ; Temperature
    Chemical Substances Bacterial Outer Membrane Proteins ; Endothelin-3 ; Endopeptidases (EC 3.4.-)
    Language English
    Publishing date 2010-09-28
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 753154-0
    ISSN 1873-2542 ; 0378-1135
    ISSN (online) 1873-2542
    ISSN 0378-1135
    DOI 10.1016/j.vetmic.2010.03.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Metallo-beta-lactamase-producing Pseudomonas aeruginosa in two hospitals from southern Brazil.

    Wirth, Fernanda W / Picoli, Simone U / Cantarelli, Vlademir V / Gonçalves, Ana L S / Brust, Flávia R / Santos, Liege M O / Barreto, Michelle F

    The Brazilian journal of infectious diseases : an official publication of the Brazilian Society of Infectious Diseases

    2010  Volume 13, Issue 3, Page(s) 170–172

    Abstract: This study determined the prevalence of metallo-beta-lactamase (MBL)-producing Pseudomonas aeruginosa in two hospitals located in the Southern part of Brazil and compare the performance of two different phenotypic tests. Thirty-one non-repetitive ... ...

    Abstract This study determined the prevalence of metallo-beta-lactamase (MBL)-producing Pseudomonas aeruginosa in two hospitals located in the Southern part of Brazil and compare the performance of two different phenotypic tests. Thirty-one non-repetitive Pseudomonas aeruginosa isolates from various clinical samples from patients admitted to two hospitals located in Rio Grande do Sul, Brazil (twenty-three from a hospital in Porto Alegre City and eight isolates from a hospital in Vale dos Sinos Region). All strains suggestive of possessing MBLs by phenotypic methods were included in this study. Phenotypic detection of MBLs was carried out simultaneously by using both the MBL Etest and disk approximation test using 2-mercaptopropionic acid close to a ceftazidime disk. Strains positive were further confirmed using molecular techniques for bla(VIM), bla(IMP) and bla(SPM-1). The prevalence of MBLs from samples of inpatients from the hospital located in Porto Alegre was 30.4% and that of inpatients from Vale dos Sinos hospital was only 3.1%. Only MBL type SPM-1 was detected in these samples by molecular analysis and all were detected by the Etest MBL strips. The prevalence of P. aeruginosa that produce MBLs can be markedly different in distinct geographical areas, even among different hospitals in the same area. In our study, the EDTA-based method was the only method able to detect all strains harboring the SPM-1 enzyme.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Brazil ; Drug Resistance, Multiple, Bacterial ; Humans ; Microbial Sensitivity Tests/methods ; Phenotype ; Pseudomonas Infections/microbiology ; Pseudomonas aeruginosa/drug effects ; Pseudomonas aeruginosa/enzymology ; Pseudomonas aeruginosa/isolation & purification ; beta-Lactamases/biosynthesis
    Chemical Substances Anti-Bacterial Agents ; beta-Lactamases (EC 3.5.2.6)
    Language English
    Publishing date 2010-02-05
    Publishing country Brazil
    Document type Comparative Study ; Journal Article
    ZDB-ID 2041400-6
    ISSN 1678-4391 ; 1413-8670
    ISSN (online) 1678-4391
    ISSN 1413-8670
    DOI 10.1590/s1413-86702009000300003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Tyrosine phosphorylation controls cortactin binding to two enterohaemorrhagic Escherichia coli effectors: Tir and EspFu/TccP

    Cantarelli, Vlademir V / Kodama, Toshio / Nijstad, Niels / Abolghait, Said Kamal / Nada, Shigeyuki / Okada, Masato / Iida, Tetsuya / Honda, Takeshi

    Cellular microbiology. 2007 July, v. 9, no. 7

    2007  

    Abstract: Enterohaemorrhagic Escherichia coli (EHEC) is an important food-borne pathogen that, upon infection, causes destruction of the microvilli brush border of intestinal cells. EHEC is able to recruit several host cell proteins and induce actin accumulation ... ...

    Abstract Enterohaemorrhagic Escherichia coli (EHEC) is an important food-borne pathogen that, upon infection, causes destruction of the microvilli brush border of intestinal cells. EHEC is able to recruit several host cell proteins and induce actin accumulation beneath its adherence site, forming a pedestal-like structure upon which the bacterium is firmly attached. Injection of bacterial effectors into the host cells is required to trigger the recruitment and activation of proteins, such as cortactin, neural Wiskott-Aldrich syndrome protein (N-WASP) and Arp2/3 complex, directly involved in the actin polymerization process. We found that cortactin, an actin-binding protein, has a pivotal role during pedestal formation by EHEC. Cortactin was found to bind directly to two important virulence factors of EHEC, Tir and EspFu, which are translocated into the host cells during infection. Binding of cortactin to these effectors is dependent upon tyrosine phosphorylation and a balance between tyrosine phosphorylation and dephosphorylation of cortactin is required to regulate pedestal formation by EHEC.
    Language English
    Dates of publication 2007-07
    Size p. 1782-1795.
    Publisher Blackwell Publishing Ltd
    Publishing place Oxford, UK
    Document type Article
    ZDB-ID 1468320-9
    ISSN 1462-5822 ; 1462-5814
    ISSN (online) 1462-5822
    ISSN 1462-5814
    DOI 10.1111/j.1462-5822.2007.00913.x
    Database NAL-Catalogue (AGRICOLA)

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