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Tornatore M, Amaral SC, Alves BM, de Oliveira GR, Finger-Jardim F, Avila EC, Pivato AF, Lobato RC, Chies JAB, Ellwanger JH, Soares EA, Sánchez-Luquez K, Gonçalves CV, Martínez AMBD, Soares MA, da Hora VP. HLA-G alleles and their impacts on placental HSV-1 infection in women from southern Brazil. J Reprod Immunol 2023; 159:104134. [PMID: 37634319 DOI: 10.1016/j.jri.2023.104134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 08/11/2023] [Accepted: 08/12/2023] [Indexed: 08/29/2023]
Abstract
The Human Leukocyte Antigen G (HLA-G) is an immunoregulatory molecule with a critical role in pregnancy success. HLA-G alleles are associated with differential susceptibility to multiple conditions, including gestational problems, infectious diseases, and viral persistence. Of note, both herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) can impair HLA-G expression, interfering with HLA-G-associated immunoregulation. On the other hand, the impacts of HLA-G alleles on susceptibility to Herpesviridae infection is a neglected issue. Therefore, this study evaluated HLA-G allele frequencies and their associations with placental Herpesviridae infection in women from southern Brazil. Placenta samples were collected soon after delivery, and detection of viral DNA of HSV-1, HSV-2 and human cytomegalovirus (HCMV) was performed by polymerase chain reaction (PCR). A fragment of HLA-G (exons 2-4) was amplified by PCR, sequenced, and analyzed to allele determination. One hundred and seventy women had their alleles determined. Overall, 25 HLA-G alleles were found, distributed into 56 different genotypes. The most frequent alleles were G* 01:01:01 and G* 01:01:02, found in 37.9 % and 16.5 % of samples, respectively. Among the 170 women, 89 (52.4 %) tested positive for Herpesviridae DNA in the placenta, 55 (32.3 %) tested negative, 3 (1.8 %) were negative for HSV-1 and HSV-2 (with absent HCMV data), and 23 (13.5 %) were undetermined. The G* 01:01:01 allele was significantly associated with an increased risk of placental HSV-1 infection (p = 0.0151; OR=1.837; IC=1.108-3.045). This study describes new information concerning placental HLA-G alleles in women from southern Brazil and helps explain how genetic background can modify susceptibility to placental infections.
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Affiliation(s)
- Michele Tornatore
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | | | - Brunna M Alves
- Post-Graduate Program in Oncovirology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, RJ, Brazil
| | | | - Fabiana Finger-Jardim
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Emiliana Claro Avila
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Andressa Fernandes Pivato
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Rubens Caurio Lobato
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - José Artur Bogo Chies
- Laboratory of Immunobiology and Immunogenetics, Post-Graduate Program in Genetics and Molecular Biology (PPGBM), Department of Genetics, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Joel Henrique Ellwanger
- Laboratory of Immunobiology and Immunogenetics, Post-Graduate Program in Genetics and Molecular Biology (PPGBM), Department of Genetics, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Esmeralda A Soares
- Post-Graduate Program in Oncovirology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, RJ, Brazil
| | - Karen Sánchez-Luquez
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Carla Vitola Gonçalves
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Ana Maria Barral de Martínez
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
| | - Marcelo A Soares
- Post-Graduate Program in Oncovirology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, RJ, Brazil; Department of Genetics, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
| | - Vanusa Pousada da Hora
- Post-Graduate Program in Health Sciences, Faculty of Medicine, Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil.
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Amaral SC, Pruski BB, de Freitas SB, Dos Santos LM, Hartwig DD. Biofilm formation in drug-resistant Acinetobacter baumannii and Acinetobacter nosocomialis isolates obtained from a university hospital in Pelotas, RS, Brazil. Lett Appl Microbiol 2023; 76:ovad094. [PMID: 37563082 DOI: 10.1093/lambio/ovad094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 06/29/2023] [Accepted: 08/03/2023] [Indexed: 08/12/2023]
Abstract
This study aimed to investigate the antibiotic resistance and biofilm formation of Acinetobacter calcoaceticus-A. baumannii (ACB) complex isolates recovered from a university hospital in Pelotas, RS, Brazil. The species were confirmed using gyrB multiplex and blaOXA-51-like genes PCR. The presence of the bfmRS virulence gene was evaluated by the PCR, and the isolates were classified based on their biofilm-forming ability on polystyrene (PO) and glass surfaces (TM). Out of 50 ACB complex isolates evaluated, 41 were identified as A. baumannii and nine as A. nosocomialis. The bfmRS gene was detected in 97.6% (40/41) of A. baumannii and 33.3% (3/9) of A. nosocomialis species. Forty-nine isolates exhibited a multidrug-resistant (MDR) profile, while one A. nosocomialis isolate presented an extensively drug-resistant (XDR) profile. All isolates were able of forming biofilms on PO surfaces and 98% (49/50) on TM surfaces. A significant correlation was observed between biofilm production on PO and TM surfaces (P < 0.05). However, no correlation was found between biofilms forming and the presence of the bfmRS gene or displaying a certain antibiotic resistance profile. In conclusion, A. baumannii and A. nosocomialis are frequent species causing nosocomial infections in a hospital in Pelotas, RS, Brazil, and both are capable of forming biofilms.
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Affiliation(s)
- Suélen Cavalheiro Amaral
- Laboratory of Bacteriology and Bioassays (LaBBio), Department of Microbiology and Parasitology, Biology Institute, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
- Center of Technological Development, Biotechnology, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
| | - Beatriz Bohns Pruski
- Laboratory of Bacteriology and Bioassays (LaBBio), Department of Microbiology and Parasitology, Biology Institute, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
| | - Stella Buchhorn de Freitas
- Laboratory of Bacteriology and Bioassays (LaBBio), Department of Microbiology and Parasitology, Biology Institute, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
| | - Lucas Moreira Dos Santos
- Center of Technological Development, Biotechnology, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
| | - Daiane Drawanz Hartwig
- Laboratory of Bacteriology and Bioassays (LaBBio), Department of Microbiology and Parasitology, Biology Institute, Federal University of Pelotas, Pelotas, 96010900, RS, Brazil
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Brandão RL, Castro IM, Bambirra EA, Amaral SC, Fietto LG, Tropia MJ, Neves MJ, Dos Santos RG, Gomes NC, Nicoli JR. Intracellular signal triggered by cholera toxin in Saccharomyces boulardii and Saccharomyces cerevisiae. Appl Environ Microbiol 1998. [PMID: 9464394 DOI: 10.1016/j.cattod.2009.07.111] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
As is the case for Saccharomyces boulardii, Saccharomyces cerevisiae W303 protects Fisher rats against cholera toxin (CT). The addition of glucose or dinitrophenol to cells of S. boulardii grown on a nonfermentable carbon source activated trehalase in a manner similar to that observed for S.cerevisiae. The addition of CT to the same cells also resulted in trehalase activation. Experiments performed separately on the A and B subunits of CT showed that both are necessary for activation. Similarly, the addition of CT but not of its separate subunits led to a cyclic AMP (cAMP) signal in both S. boulardii and S. cerevisiae. These data suggest that trehalase stimulation by CT probably occurred through the cAMP-mediated protein phosphorylation cascade. The requirement of CT subunit B for both the cAMP signal and trehalase activation indicates the presence of a specific receptor on the yeasts able to bind to the toxin, a situation similar to that observed for mammalian cells. This hypothesis was reinforced by experiments with 125I-labeled CT showing specific binding of the toxin to yeast cells. The adhesion of CT to a receptor on the yeast surface through the B subunit and internalization of the A subunit (necessary for the cAMP signal and trehalase activation) could be one more mechanism explaining protection against the toxin observed for rats treated with yeasts.
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Affiliation(s)
- R L Brandão
- Laboratório de Fisologia e Bioquímica de Microorganismos, Escola de Farmácia, Universidade Federal de Ouro Preto, Brazil
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Brandão RL, Castro IM, Bambirra EA, Amaral SC, Fietto LG, Tropia MJ, Neves MJ, Dos Santos RG, Gomes NC, Nicoli JR. Intracellular signal triggered by cholera toxin in Saccharomyces boulardii and Saccharomyces cerevisiae. Appl Environ Microbiol 1998; 64:564-8. [PMID: 9464394 PMCID: PMC106083 DOI: 10.1128/aem.64.2.564-568.1998] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
As is the case for Saccharomyces boulardii, Saccharomyces cerevisiae W303 protects Fisher rats against cholera toxin (CT). The addition of glucose or dinitrophenol to cells of S. boulardii grown on a nonfermentable carbon source activated trehalase in a manner similar to that observed for S.cerevisiae. The addition of CT to the same cells also resulted in trehalase activation. Experiments performed separately on the A and B subunits of CT showed that both are necessary for activation. Similarly, the addition of CT but not of its separate subunits led to a cyclic AMP (cAMP) signal in both S. boulardii and S. cerevisiae. These data suggest that trehalase stimulation by CT probably occurred through the cAMP-mediated protein phosphorylation cascade. The requirement of CT subunit B for both the cAMP signal and trehalase activation indicates the presence of a specific receptor on the yeasts able to bind to the toxin, a situation similar to that observed for mammalian cells. This hypothesis was reinforced by experiments with 125I-labeled CT showing specific binding of the toxin to yeast cells. The adhesion of CT to a receptor on the yeast surface through the B subunit and internalization of the A subunit (necessary for the cAMP signal and trehalase activation) could be one more mechanism explaining protection against the toxin observed for rats treated with yeasts.
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Affiliation(s)
- R L Brandão
- Laboratório de Fisologia e Bioquímica de Microorganismos, Escola de Farmácia, Universidade Federal de Ouro Preto, Brazil
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