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1
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Coelho FF, da Silva MA, Lopes TB, Polatto JM, de Castro NS, Andrade LAF, Lourenço KL, Sato HI, de Carvalho AF, Coelho HP, Bagno FF, Luz D, Viala VL, Cattony PQ, Melo BDS, Moro AM, Quintilio W, Barbosa AP, Bomfim CG, Soares CP, Guzzo CR, Fonseca FG, Durigon EL, Gazzinelli RT, Ribeiro Teixeira SM, Piazza RMF, Fernandes AP. SARS-CoV-2 Rapid Antigen Test Based on a New Anti-Nucleocapsid Protein Monoclonal Antibody: Development and Real-Time Validation. Microorganisms 2023; 11:2422. [PMID: 37894080 PMCID: PMC10608853 DOI: 10.3390/microorganisms11102422] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 08/27/2023] [Accepted: 09/01/2023] [Indexed: 10/29/2023] Open
Abstract
SARS-CoV-2 diagnostic tests have become an important tool for pandemic control. Among the alternatives for COVID-19 diagnosis, antigen rapid diagnostic tests (Ag-RDT) are very convenient and widely used. However, as SARS-CoV-2 variants may continuously emerge, the replacement of tests and reagents may be required to maintain the sensitivity of Ag-RDTs. Here, we describe the development and validation of an Ag-RDT during an outbreak of the Omicron variant, including the characterization of a new monoclonal antibody (anti-DTC-N 1B3 mAb) that recognizes the Nucleocapsid protein (N). The anti-DTC-N 1B3 mAb recognized the sequence TFPPTEPKKDKKK located at the C-terminus of the N protein of main SARS-CoV-2 variants of concern. Accordingly, the Ag-RDT prototypes using the anti-DTC-N 1B3 mAB detected all the SARS-CoV-2 variants-Wuhan, Alpha, Gamma, Delta, P2 and Omicron. The performance of the best prototype (sensitivity of 95.2% for samples with Ct ≤ 25; specificity of 98.3% and overall accuracy of 85.0%) met the WHO recommendations. Moreover, results from a patients' follow-up study indicated that, if performed within the first three days after onset of symptoms, the Ag-RDT displayed 100% sensitivity. Thus, the new mAb and the Ag-RDT developed herein may constitute alternative tools for COVID-19 point-of-care diagnosis and epidemiological surveillance.
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Affiliation(s)
- Fabiana Fioravante Coelho
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
- Hospital da Polícia Militar de Minas Gerais, Polícia Militar de Minas Gerais, Belo Horizonte 30110-013, Brazil
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Miriam Aparecida da Silva
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Thiciany Blener Lopes
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Juliana Moutinho Polatto
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Natália Salazar de Castro
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Luis Adan Flores Andrade
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Karine Lima Lourenço
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Hugo Itaru Sato
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Alex Fiorini de Carvalho
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Helena Perez Coelho
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Flávia Fonseca Bagno
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Daniela Luz
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Vincent Louis Viala
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Pedro Queiroz Cattony
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Bruna de Sousa Melo
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Ana Maria Moro
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Wagner Quintilio
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Ana Paula Barbosa
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Camila Gasque Bomfim
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-900, Brazil; (C.G.B.); (C.P.S.); (C.R.G.); (E.L.D.)
| | - Camila Pereira Soares
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-900, Brazil; (C.G.B.); (C.P.S.); (C.R.G.); (E.L.D.)
| | - Cristiane Rodrigues Guzzo
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-900, Brazil; (C.G.B.); (C.P.S.); (C.R.G.); (E.L.D.)
| | - Flavio Guimarães Fonseca
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Edison Luiz Durigon
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-900, Brazil; (C.G.B.); (C.P.S.); (C.R.G.); (E.L.D.)
| | - Ricardo Tostes Gazzinelli
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Santuza M. Ribeiro Teixeira
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
| | - Roxane Maria Fontes Piazza
- Instituto Butantan, São Paulo 05503-900, Brazil; (M.A.d.S.); (J.M.P.); (D.L.); (V.L.V.); (P.Q.C.); (B.d.S.M.); (A.M.M.); (W.Q.); (A.P.B.); (R.M.F.P.)
| | - Ana Paula Fernandes
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil;
- Centro de Tecnologia em Vacinas, Universidade Federal de Minas Gerais, Belo Horizonte 31310-260, Brazil; (T.B.L.); (N.S.d.C.); (L.A.F.A.); (K.L.L.); (H.I.S.); (A.F.d.C.); (H.P.C.); (F.F.B.); (F.G.F.); (R.T.G.); (S.M.R.T.)
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Valencio A, da Silva MA, Santos FF, Polatto JM, Machado MMF, Piazza RMF, Gales AC. Capture ELISA for KPC Detection in Gram-Negative Bacilli: Development and Standardisation. Microorganisms 2023; 11:microorganisms11041052. [PMID: 37110475 PMCID: PMC10142090 DOI: 10.3390/microorganisms11041052] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/03/2023] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
The detection of KPC-type carbapenemases is necessary for guiding appropriate antibiotic therapy and the implementation of antimicrobial stewardship and infection control measures. Currently, few tests are capable of differentiating carbapenemase types, restricting the lab reports to their presence or not. The aim of this work was to raise antibodies and develop an ELISA test to detect KPC-2 and its D179 mutants. The ELISA-KPC test was designed using rabbit and mouse polyclonal antibodies. Four different protocols were tested to select the bacterial inoculum with the highest sensitivity and specificity rates. The standardisation procedure was performed using 109 previously characterised clinical isolates, showing 100% of sensitivity and 89% of specificity. The ELISA-KPC detected all isolates producing carbapenemases, including KPC variants displaying the ESBL phenotype such as KPC-33 and -66.
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Affiliation(s)
- André Valencio
- Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo 04039-032, Brazil
| | | | - Fernanda Fernandes Santos
- Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo 04039-032, Brazil
| | | | - Marcelo Marcondes Ferreira Machado
- Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo 04039-032, Brazil
| | | | - Ana Cristina Gales
- Division of Infectious Diseases, Department of Internal Medicine, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo 04039-032, Brazil
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Prudencio CR, Gomes da Costa V, Rocha LB, da Costa HHM, Orts DJB, da Silva Santos FR, Rahal P, Lino NAB, da Conceição PJP, Bittar C, Machado RRG, Durigon EL, Araujo JP, Polatto JM, da Silva MA, de Oliveira JA, Mitsunari T, Pereira LR, Andreata-Santos R, de Souza Ferreira LC, Luz D, Piazza RMF. Identification of Zika Virus NS1-Derived Peptides with Potential Applications in Serological Tests. Viruses 2023; 15:v15030654. [PMID: 36992364 PMCID: PMC10052002 DOI: 10.3390/v15030654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/14/2023] [Accepted: 02/23/2023] [Indexed: 03/05/2023] Open
Abstract
Zika virus (ZIKV), a mosquito-borne pathogen, is an emerging arbovirus associated with sporadic symptomatic cases of great medical concern, particularly among pregnant women and newborns affected with neurological disorders. Serological diagnosis of ZIKV infection is still an unmet challenge due to the co-circulation of the dengue virus, which shares extensive sequence conservation of structural proteins leading to the generation of cross-reactive antibodies. In this study, we aimed to obtain tools for the development of improved serological tests for the detection of ZIKV infection. Polyclonal sera (pAb) and a monoclonal antibody (mAb 2F2) against a recombinant form of the ZIKV nonstructural protein 1 (NS1) allowed the identification of linear peptide epitopes of the NS1 protein. Based on these findings, six chemically synthesized peptides were tested both in dot blot and ELISA assays using convalescent sera collected from ZIKV-infected patients. Two of these peptides specifically detected the presence of ZIKV antibodies and proved to be candidates for the detection of ZIKV-infected subjects. The availability of these tools opens perspectives for the development of NS1-based serological tests with enhanced sensitivity regarding other flaviviruses.
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Affiliation(s)
- Carlos Roberto Prudencio
- Laboratório de Imunobiotecnologia, Centro de Imunologia, Instituto Adolfo Lutz, Av. Dr. Arnaldo, 351, São Paulo 01246-902, SP, Brazil
- Correspondence: (C.R.P.); (D.L.); (R.M.F.P.); Tel.: +55-11-3068-2886 (C.R.P.); +55-11-2627-9708 (D.L.); +55-11-2627-9724 (R.M.F.P.)
| | - Vivaldo Gomes da Costa
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Cristóvão Colombo, 2265, São Jose do Rio Preto 15054-000, SP, Brazil
| | - Leticia Barboza Rocha
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
| | - Hernan Hermes Monteiro da Costa
- Laboratório de Imunobiotecnologia, Centro de Imunologia, Instituto Adolfo Lutz, Av. Dr. Arnaldo, 351, São Paulo 01246-902, SP, Brazil
| | - Diego José Belato Orts
- Laboratório de Imunobiotecnologia, Centro de Imunologia, Instituto Adolfo Lutz, Av. Dr. Arnaldo, 351, São Paulo 01246-902, SP, Brazil
| | - Felipe Rocha da Silva Santos
- Laboratório de Imunobiotecnologia, Centro de Imunologia, Instituto Adolfo Lutz, Av. Dr. Arnaldo, 351, São Paulo 01246-902, SP, Brazil
| | - Paula Rahal
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Cristóvão Colombo, 2265, São Jose do Rio Preto 15054-000, SP, Brazil
| | - Nikolas Alexander Borsato Lino
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Cristóvão Colombo, 2265, São Jose do Rio Preto 15054-000, SP, Brazil
| | - Pâmela Jóyce Previdelli da Conceição
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Cristóvão Colombo, 2265, São Jose do Rio Preto 15054-000, SP, Brazil
| | - Cintia Bittar
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Cristóvão Colombo, 2265, São Jose do Rio Preto 15054-000, SP, Brazil
| | - Rafael Rahal Guaragna Machado
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
| | - Edison Luiz Durigon
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
| | - João Pessoa Araujo
- Instituto de Biotecnologia, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu 18607-440, SP, Brazil
| | - Juliana Moutinho Polatto
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
| | - Miriam Aparecida da Silva
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
| | - Joyce Araújo de Oliveira
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
| | - Thais Mitsunari
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
| | - Lennon Ramos Pereira
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
| | - Robert Andreata-Santos
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
| | - Luís Carlos de Souza Ferreira
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
- Plataforma Científica Pasteur USP, Universidade de São Paulo, São Paulo 05508-000, SP, Brazil
| | - Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
- Correspondence: (C.R.P.); (D.L.); (R.M.F.P.); Tel.: +55-11-3068-2886 (C.R.P.); +55-11-2627-9708 (D.L.); +55-11-2627-9724 (R.M.F.P.)
| | - Roxane Maria Fontes Piazza
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, 1500, São Paulo 05503-900, SP, Brazil
- Correspondence: (C.R.P.); (D.L.); (R.M.F.P.); Tel.: +55-11-3068-2886 (C.R.P.); +55-11-2627-9708 (D.L.); +55-11-2627-9724 (R.M.F.P.)
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Silva HGDS, Franzolin MR, dos Anjos GF, Barbosa AS, dos Santos LF, Miranda KF, Marques RM, de Souza MCL, Piazza RMF, Domingos MDO. O55 Polysaccharides Are Good Antigen Targets for the Formulation of Vaccines against O55 STEC and Capsulated aEPEC Strains. Pathogens 2022; 11:pathogens11080895. [PMID: 36015015 PMCID: PMC9414270 DOI: 10.3390/pathogens11080895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 11/16/2022] Open
Abstract
The serogroup O55 of E. coli is composed of strains whose mechanisms of virulence are different from each other. Since the O55 polysaccharides are present in all E. coli O55 strains, and so are the polymers that compose the capsule of O55 atypical enteropathogenic E. coli (aEPEC), it was investigated whether anti-O55 antibodies were able to help the innate immune system to eliminate capsulated aEPEC and Shiga toxin-producing E. coli (STEC) belonging to the serogroup O55. The results demonstrate that the capsule of EPEC was able to inhibit the deposition of C3b on the bacterial surface and, as a consequence, their lysis by the alternative pathway of the complement system. However, in the presence of antibodies, the ability of the complement to lyse these pathogens was restored. It was also observed that macrophages were able to ingest EPEC and STEC, but they were only able to kill the ingested pathogens in the presence of antibodies. Anti-O55 antibodies were also able to inhibit aEPEC and STEC O55 adherence to human epithelial cells. In summary, the results demonstrated that the O55 polysaccharides have the potential to induce an effective humoral immune response against STEC and EPEC, indicating that they are good antigen targets to be used in vaccine formulations against these pathogens.
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Affiliation(s)
| | - Marcia Regina Franzolin
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Geovana Ferreira dos Anjos
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Angela Silva Barbosa
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Luis Fernando dos Santos
- Centro de Bacteriologia, Núcleo de Doenças Entéricas, Instituto Adolfo Lutz, Avenida Dr. Arnaldo, 355, São Paulo CEP 01246-000, SP, Brazil
| | - Kaique Ferrari Miranda
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Ronaldo Maciel Marques
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Matilde Costa Lima de Souza
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Roxane Maria Fontes Piazza
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
| | - Marta de Oliveira Domingos
- Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brasil, 1500, São Paulo CEP 05503-900, SP, Brazil
- Correspondence: ; Tel.: +55-11-2627-9708
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Kanamura CT, Piazza RMF, Iglézias SD'A, Borges CC, Sansone M, Polatto JM, Teixeira DL, da Silva MA, Rocha LB, Nogueira JS, Maeda AY, da Silva Vasami FG. Anti-DENV-NS1 monoclonal antibody for the differential histopathological diagnosis of hemorrhagic fever caused by dengue. Braz J Microbiol 2022; 53:777-783. [PMID: 35129818 PMCID: PMC9151983 DOI: 10.1007/s42770-022-00697-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 04/23/2021] [Accepted: 02/01/2022] [Indexed: 02/01/2023] Open
Abstract
Dengue is the most prevalent arboviral disease in humans in tropical and subtropical regions, especially in urban areas, and can cause major epidemics. Although a self-limiting illness, it may sometimes have serious hemorrhagic manifestations, and the outcome of dengue hemorrhagic fever has similar clinical manifestations as in other infections, which could result in death. Therefore, autopsy procedures are required under certain circumstances such as in hemorrhagic fevers, sometimes to confirm or to clarify the diagnosis that may have epidemiological consequences. Normally, the Immunohistochemistry Laboratory of the Pathology Center of Adolfo Lutz Institute receives autopsy samples from different hospitals in Sao Paulo State to confirm a previous diagnosis, especially hemorrhagic fever of infectious etiology. For this diagnosis, we have been using a mouse polyclonal antibody to dengue virus that often does not provide a clear conclusion, because of background staining or no relevant immunostaining, which hampers the histopathological analysis. Accordingly, in the present study, anti-DENV-NS1 monoclonal antibody (4H2) was tested to determine its accuracy in immunohistochemical analysis. Twenty-four autopsy cases of hemorrhagic febrile syndrome showing histopathological alterations compatible with dengue disease were studied: twenty cases were confirmed by RT-PCR for DENV-2 and in four by RT-PCR for yellow fever virus. Samples from autopsied cases of deaths caused by other infectious diseases (two meningitis C and two severe acute respiratory syndrome caused by influenza A H1N1) were included as negative control cases. Positive immunostaining for DENV-NS1 was detected in 16/20 (80%) liver samples and 11/15 (73%) spleen samples from autopsied hemorrhagic dengue patients, whereas the polyclonal antibody detected DENV antigens in 12/20 (60%) liver and in 6/15 (40%) spleen samples from the same cases. Positive results were not obtained with liver biopsy samples from yellow fever or Neisseria meningitides and Flu-A cases. 4H2 mAb recognizes the native protein of the four DENV serotypes in infected cells and did not cross-react with native ZIKV- or CHKV-infected cells by immunohistochemical assay, so it is a useful tool for differential histopathological conclusion of acute febrile hemorrhagic deaths.
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Affiliation(s)
- Cristina Takami Kanamura
- Núcleo de Anatomia Patológica Do Centro de Patologia, Instituto Adolfo Lutz, São Paulo, SP, Brazil
| | | | | | - Cinthya Cirqueira Borges
- Núcleo de Anatomia Patológica Do Centro de Patologia, Instituto Adolfo Lutz, São Paulo, SP, Brazil
| | - Marcelo Sansone
- Núcleo de Anatomia Patológica Do Centro de Patologia, Instituto Adolfo Lutz, São Paulo, SP, Brazil
| | | | | | | | | | - Juliana Silva Nogueira
- Núcleo de Doenças de Transmissão Vetorial Do Centro de Virologia, Instituto Adolfo Lutz, São Paulo, SP, Brazil
| | - Adriana Yurika Maeda
- Núcleo de Doenças de Transmissão Vetorial Do Centro de Virologia, Instituto Adolfo Lutz, São Paulo, SP, Brazil
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Henrique IDM, Sacerdoti F, Ferreira RL, Henrique C, Amaral MM, Piazza RMF, Luz D. Therapeutic Antibodies Against Shiga Toxins: Trends and Perspectives. Front Cell Infect Microbiol 2022; 12:825856. [PMID: 35223548 PMCID: PMC8866733 DOI: 10.3389/fcimb.2022.825856] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/11/2022] [Indexed: 12/22/2022] Open
Abstract
Shiga toxins (Stx) are AB5-type toxins, composed of five B subunits which bind to Gb3 host cell receptors and an active A subunit, whose action on the ribosome leads to protein synthesis suppression. The two Stx types (Stx1 and Stx2) and their subtypes can be produced by Shiga toxin-producing Escherichia coli strains and some Shigella spp. These bacteria colonize the colon and induce diarrhea that may progress to hemorrhagic colitis and in the most severe cases, to hemolytic uremic syndrome, which could lead to death. Since the use of antibiotics in these infections is a topic of great controversy, the treatment remains supportive and there are no specific therapies to ameliorate the course. Therefore, there is an open window for Stx neutralization employing antibodies, which are versatile molecules. Indeed, polyclonal, monoclonal, and recombinant antibodies have been raised and tested in vitro and in vivo assays, showing differences in their neutralizing ability against deleterious effects of Stx. These molecules are in different phases of development for which we decide to present herein an updated report of these antibody molecules, their source, advantages, and disadvantages of the promising ones, as well as the challenges faced until reaching their applicability.
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Affiliation(s)
| | - Flavia Sacerdoti
- Laboratorio de Fisiopatogenia, Instituto de Fisiología y Biofísica Bernardo Houssay (IFIBIO Houssay-CONICET), Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | | | - Camila Henrique
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
| | - Maria Marta Amaral
- Laboratorio de Fisiopatogenia, Instituto de Fisiología y Biofísica Bernardo Houssay (IFIBIO Houssay-CONICET), Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Roxane Maria Fontes Piazza
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
- *Correspondence: Roxane Maria Fontes Piazza, ; Daniela Luz,
| | - Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
- *Correspondence: Roxane Maria Fontes Piazza, ; Daniela Luz,
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Caetano BDL, Domingos MDO, da Silva MA, da Silva JCA, Polatto JM, Montoni F, Iwai LK, Pimenta DC, Vigerelli H, Vieira PCG, Ruiz RDC, Patané JS, Piazza RMF. In Silico Prediction and Design of Uropathogenic Escherichia coli Alpha-Hemolysin Generate a Soluble and Hemolytic Recombinant Toxin. Microorganisms 2022; 10:microorganisms10010172. [PMID: 35056621 PMCID: PMC8778037 DOI: 10.3390/microorganisms10010172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/01/2022] [Accepted: 01/08/2022] [Indexed: 01/27/2023] Open
Abstract
The secretion of α-hemolysin by uropathogenic Escherichia coli (UPEC) is commonly associated with the severity of urinary tract infections, which makes it a predictor of poor prognosis among patients. Accordingly, this toxin has become a target for diagnostic tests and therapeutic interventions. However, there are several obstacles associated with the process of α-hemolysin purification, therefore limiting its utilization in scientific investigations. In order to overcome the problems associated with α-hemolysin expression, after in silico prediction, a 20.48 kDa soluble α-hemolysin recombinant denoted rHlyA was constructed. This recombinant is composed by a 182 amino acid sequence localized in the aa542–723 region of the toxin molecule. The antigenic determinants of the rHlyA were estimated by bioinformatics analysis taking into consideration the tertiary form of the toxin, epitope analysis tools, and solubility inference. The results indicated that rHlyA has three antigenic domains localized in the aa555–565, aa600–610, and aa674–717 regions. Functional investigation of rHlyA demonstrated that it has hemolytic activity against sheep red cells, but no cytotoxic effect against epithelial bladder cells. In summary, the results obtained in this study indicate that rHlyA is a soluble recombinant protein that can be used as a tool in studies that aim to understand the mechanisms involved in the hemolytic and cytotoxic activities of α-hemolysin produced by UPEC. In addition, rHlyA can be applied to generate monoclonal and/or polyclonal antibodies that can be utilized in the development of diagnostic tests and therapeutic interventions.
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Affiliation(s)
- Bruna De Lucca Caetano
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Marta de Oliveira Domingos
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Miriam Aparecida da Silva
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Jessika Cristina Alves da Silva
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Juliana Moutinho Polatto
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Fabio Montoni
- Laboratório de Toxinologia Aplicada, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (F.M.); (L.K.I.)
| | - Leo Kei Iwai
- Laboratório de Toxinologia Aplicada, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (F.M.); (L.K.I.)
| | - Daniel Carvalho Pimenta
- Laboratório de Biofísica e Bioquímica, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (D.C.P.); (H.V.)
| | - Hugo Vigerelli
- Laboratório de Biofísica e Bioquímica, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (D.C.P.); (H.V.)
| | - Paulo Cesar Gomes Vieira
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - Rita de Cassia Ruiz
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
| | - José Salvatore Patané
- Laboratório de Ciclo Celular, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil
- Correspondence: (J.S.P.); (R.M.F.P.)
| | - Roxane Maria Fontes Piazza
- Laboratório de Bacteriologia, Instituto Butantan, Av. Vital Brazil, São Paulo 1500-05503-900, SP, Brazil; (B.D.L.C.); (M.d.O.D.); (M.A.d.S.); (J.C.A.d.S.); (J.M.P.); (P.C.G.V.); (R.d.C.R.)
- Correspondence: (J.S.P.); (R.M.F.P.)
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Henrique C, Falcão MAP, De Araújo Pimenta L, Maleski ALA, Lima C, Mitsunari T, Sampaio SC, Lopes-Ferreira M, Piazza RMF. Heat-Labile Toxin from Enterotoxigenic Escherichia coli Causes Systemic Impairment in Zebrafish Model. Toxins (Basel) 2021; 13:419. [PMID: 34204819 PMCID: PMC8231604 DOI: 10.3390/toxins13060419] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/05/2021] [Accepted: 05/10/2021] [Indexed: 11/20/2022] Open
Abstract
Heat-labile toxin I (LT-I), produced by strains of enterotoxigenic Escherichia coli (ETEC), causes profuse watery diarrhea in humans. Different in vitro and in vivo models have already elucidated the mechanism of action of this toxin; however, their use does not always allow for more specific studies on how the LT-I toxin acts in systemic tracts and intestinal cell lines. In the present work, zebrafish (Danio rerio) and human intestinal cells (Caco-2) were used as models to study the toxin LT-I. Caco-2 cells were used, in the 62nd passage, at different cell concentrations. LT-I was conjugated to FITC to visualize its transport in cells, as well as microinjected into the caudal vein of zebrafish larvae, in order to investigate its effects on survival, systemic traffic, and morphological formation. The internalization of LT-I was visualized in 3 × 104 Caco-2 cells, being associated with the cell membrane and nucleus. The systemic traffic of LT-I in zebrafish larvae showed its presence in the cardiac cavity, yolk, and regions of the intestine, as demonstrated by cardiac edema (100%), the absence of a swimming bladder (100%), and yolk edema (80%), in addition to growth limitation in the larvae, compared to the control group. There was a reduction in heart rate during the assessment of larval survival kinetics, demonstrating the cardiotoxic effect of LT-I. Thus, in this study, we provide essential new depictions of the features of LT-I.
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Affiliation(s)
- Camila Henrique
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (C.H.); (T.M.)
| | - Maria Alice Pimentel Falcão
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (M.A.P.F.); (A.L.A.M.); (C.L.)
| | - Luciana De Araújo Pimenta
- Laboratório de Fisiopatologia, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (L.D.A.P.); (S.C.S.)
| | - Adolfo Luís Almeida Maleski
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (M.A.P.F.); (A.L.A.M.); (C.L.)
| | - Carla Lima
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (M.A.P.F.); (A.L.A.M.); (C.L.)
| | - Thais Mitsunari
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (C.H.); (T.M.)
| | - Sandra Coccuzzo Sampaio
- Laboratório de Fisiopatologia, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (L.D.A.P.); (S.C.S.)
| | - Mônica Lopes-Ferreira
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, SP, Brazil; (M.A.P.F.); (A.L.A.M.); (C.L.)
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9
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Machado Ribeiro TR, Salgaço MK, Adorno MAT, da Silva MA, Piazza RMF, Sivieri K, Moreira CG. Human microbiota modulation via QseC sensor kinase mediated in the Escherichia coli O104:H4 outbreak strain infection in microbiome model. BMC Microbiol 2021; 21:163. [PMID: 34078285 PMCID: PMC8170955 DOI: 10.1186/s12866-021-02220-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 05/06/2021] [Indexed: 01/01/2023] Open
Abstract
Background The intestinal microbiota plays a crucial role in human health, adjusting its composition and the microbial metabolites protects the gut against invading microorganisms. Enteroaggregative E. coli (EAEC) is an important diarrheagenic pathogen, which may cause acute or persistent diarrhea (≥14 days). The outbreak strain has the potent Shiga toxin, forms a dense biofilm and communicate via QseBC two-component system regulating the expression of many important virulence factors. Results Herein, we investigated the QseC histidine sensor kinase role in the microbiota shift during O104:H4 C227–11 infection in the colonic model SHIME® (Simulator of the Human Intestinal Microbial Ecosystem) and in vivo mice model. The microbiota imbalance caused by C227–11 infection affected ỿ-Proteobacteria and Lactobacillus spp. predominance, with direct alteration in intestinal metabolites driven by microbiota change, such as Short-chain fatty acids (SCFA). However, in the absence of QseC sensor kinase, the microbiota recovery was delayed on day 3 p.i., with change in the intestinal production of SCFA, like an increase in acetate production. The higher predominance of Lactobacillus spp. in the microbiota and significant augmented qseC gene expression levels were also observed during C227–11 mice infection upon intestinal depletion. Novel insights during pathogenic bacteria infection with the intestinal microbiota were observed. The QseC kinase sensor seems to have a role in the microbiota shift during the infectious process by Shiga toxin-producing EAEC C227–11. Conclusions The QseC role in C227–11 infection helps to unravel the intestine microbiota modulation and its metabolites during SHIME® and in vivo models, besides they contribute to elucidate bacterial intestinal pathogenesis and the microbiota relationships. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-021-02220-3.
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Affiliation(s)
- Tamara Renata Machado Ribeiro
- Department of Biological Sciences, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, SP, Brazil
| | - Mateus Kawata Salgaço
- Department of Food and Nutrition, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, SP, Brazil
| | - Maria Angela Tallarico Adorno
- Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo (USP), São Carlos, SP, Brazil
| | | | | | - Katia Sivieri
- Department of Food and Nutrition, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, SP, Brazil
| | - Cristiano Gallina Moreira
- Department of Biological Sciences, School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara, SP, Brazil.
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10
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de Sousa Melo B, Fernandes BHV, Lopes-Ferreira MVA, Henrique C, Piazza RMF, Luz D. Zebrafish embryo sensitivity test as in vivo platform to anti-Shiga toxin compound screening. Braz J Microbiol 2020; 51:1021-1027. [PMID: 32449119 DOI: 10.1007/s42770-020-00305-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) pathotype secretes two types of AB5 cytotoxins (Stx1 and Stx2), responsible for complications such as hemorrhagic colitis (HC) and hemolytic uremic syndrome (HUS) in infected patients, which could lead to sequels and death. Currently, there is no effective treatment against the cytotoxic effect of these toxins. However, in order to approve any therapy molecule, an animal experiment is required in order to evaluate the efficacy and safety of therapeutic approaches. The use of alternative small host models is growing among human infectious disease studies, particularly the vertebrate zebrafish model, since relevant results have been described for pathogen-host interaction. In this sense, the present work aimed to analyze the toxic effect of Shiga toxins in zebrafish embryo model in order to standardize this method in the future to be used as a fast, simple, and efficient methodology for the screening of therapeutic molecules. Herein, we demonstrated that the embryos were sensitive in a dose-dependent manner to both Stx toxins, with LD50 of 22 μg/mL for Stx1 and 33 μg/mL for Stx2, and the use of anti-Stx polyclonal antibody abolished the toxic effect. Therefore, this methodology can be a rapid alternative method for selecting promising compounds against Stx toxins, such as recombinant antibodies.
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Affiliation(s)
| | - Bianca Helena Ventura Fernandes
- Laboratório de Controle Genético e Sanitário Animal, Unidade Zebrafish, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | | | - Camila Henrique
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
| | | | - Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil. .,Laboratório de Monoclonais, Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, Rua Talim, 330, São José dos Campos, SP, 12231-280, Brazil.
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11
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Gioia-Di Chiacchio RM, Cunha MPV, de Sá LRM, Davies YM, Pereira CBP, Martins FH, Munhoz DD, Abe CM, Franzolin MR, Dos Santos LF, Guth BEC, Elias WP, Piazza RMF, Knöbl T. Novel Hybrid of Typical Enteropathogenic Escherichia coli and Shiga-Toxin-Producing E. coli (tEPEC/STEC) Emerging From Pet Birds. Front Microbiol 2018; 9:2975. [PMID: 30574131 PMCID: PMC6291465 DOI: 10.3389/fmicb.2018.02975] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 11/19/2018] [Indexed: 12/01/2022] Open
Abstract
Exotic psittacine birds have been implicated as reservoir of diarrheagenic Escherichia coli (E. coli), including enteropathogenic E. coli (EPEC) and Shiga-toxin producing E. coli (STEC). Here, we present a genotypic and phenotypic characterization of typical EPEC/STEC hybrid strains isolated from exotic psittacine birds. The strains were positive for eae, bfpA, and stx2f genes, belong to serotype O137:H6 and ST2678. Two strains were subject to whole genome sequencing, confirming the presence of the virulence factors of both E. coli pathotypes. Phenotypical in vitro tests confirmed their ability to adhere to HeLa cells and cause cytotoxicity to Vero cells. The rabbit ileal loop assays showed the attaching and effacing lesion, in addition to inflammatory process and overproduction of intestinal mucus. This is the first report of hybrid typical EPEC/STEC (O137:H6/ST2678) strains isolated from companion psittacine birds and the results suggest zoonotic risks.
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Affiliation(s)
- Rosely Martins Gioia-Di Chiacchio
- Department of Pathology, School of Veterinary Medicine and Animal Science, São Paulo, Brazil.,School of Veterinary Medicine, Paulista University, São Paulo, Brazil
| | | | | | - Yamê Minieiro Davies
- Department of Pathology, School of Veterinary Medicine and Animal Science, São Paulo, Brazil
| | | | | | | | | | | | | | | | | | | | - Terezinha Knöbl
- Department of Pathology, School of Veterinary Medicine and Animal Science, São Paulo, Brazil
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Luz D, Amaral MM, Sacerdoti F, Bernal AM, Quintilio W, Moro AM, Palermo MS, Ibarra C, Piazza RMF. Human Recombinant Fab Fragment Neutralizes Shiga Toxin Type 2 Cytotoxic Effects in vitro and in vivo. Toxins (Basel) 2018; 10:toxins10120508. [PMID: 30513821 PMCID: PMC6315604 DOI: 10.3390/toxins10120508] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 11/24/2018] [Accepted: 11/28/2018] [Indexed: 12/13/2022] Open
Abstract
Shiga toxin (Stx) producing Escherichia coli (STEC) is responsible for causing hemolytic uremic syndrome (HUS), a life-threatening thrombotic microangiopathy characterized by thrombocytopenia, hemolytic anemia, and acute renal failure after bacterially induced hemorrhagic diarrhea. Until now, there has been neither an effective treatment nor method of prevention for the deleterious effects caused by Stx intoxication. Antibodies are well recognized as affinity components of therapeutic drugs; thus, a previously obtained recombinant human FabC11:Stx2 fragment was used to neutralize Stx2 in vitro in a Vero cell viability assay. Herein, we demonstrated that this fragment neutralized, in a dose-dependent manner, the cytotoxic effects of Stx2 on human glomerular endothelial cells, on human proximal tubular epithelial cells, and prevented the morphological alterations induced by Stx2. FabC11:Stx2 protected mice from a lethal dose of Stx2 by toxin-antibody pre-incubation. Altogether, our results show the ability of a new encouraging molecule to prevent Stx-intoxication symptoms during STEC infection.
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Affiliation(s)
- Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo 05503900, Brasil.
| | - Maria Marta Amaral
- Laboratorio de Fisiopatogenia, Departamento de Fisiología, Instituto de Fisiología y Biofísica Bernardo Houssay (IFIBIO Houssay-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121, Argentina.
| | - Flavia Sacerdoti
- Laboratorio de Fisiopatogenia, Departamento de Fisiología, Instituto de Fisiología y Biofísica Bernardo Houssay (IFIBIO Houssay-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121, Argentina.
| | - Alan Mauro Bernal
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental, (IMEX)-CONICET-Academia Nacional de Medicina, Buenos Aires C1425, Argentina.
| | - Wagner Quintilio
- Laboratório de Biofármacos em Células Animais, Instituto Butantan, São Paulo, SP 05503-900, Brazil.
| | - Ana Maria Moro
- Laboratório de Biofármacos em Células Animais, Instituto Butantan, São Paulo, SP 05503-900, Brazil.
| | - Marina Sandra Palermo
- Laboratorio de Patogénesis e Inmunología de Procesos Infecciosos, Instituto de Medicina Experimental, (IMEX)-CONICET-Academia Nacional de Medicina, Buenos Aires C1425, Argentina.
| | - Cristina Ibarra
- Laboratorio de Fisiopatogenia, Departamento de Fisiología, Instituto de Fisiología y Biofísica Bernardo Houssay (IFIBIO Houssay-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1121, Argentina.
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Rocha LB, Alves RPDS, Caetano BA, Pereira LR, Mitsunari T, Amorim JH, Polatto JM, Botosso VF, Gallina NMF, Palacios R, Precioso AR, Granato CFH, Oliveira DBL, Silveira VBD, Luz D, Ferreira LCDS, Piazza RMF. Epitope Sequences in Dengue Virus NS1 Protein Identified by Monoclonal Antibodies. Antibodies (Basel) 2017; 6:antib6040014. [PMID: 31548529 PMCID: PMC6698852 DOI: 10.3390/antib6040014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 09/22/2017] [Accepted: 09/22/2017] [Indexed: 11/17/2022] Open
Abstract
Dengue nonstructural protein 1 (NS1) is a multi-functional glycoprotein with essential functions both in viral replication and modulation of host innate immune responses. NS1 has been established as a good surrogate marker for infection. In the present study, we generated four anti-NS1 monoclonal antibodies against recombinant NS1 protein from dengue virus serotype 2 (DENV2), which were used to map three NS1 epitopes. The sequence 193AVHADMGYWIESALNDT209 was recognized by monoclonal antibodies 2H5 and 4H1BC, which also cross-reacted with Zika virus (ZIKV) protein. On the other hand, the sequence 25VHTWTEQYKFQPES38 was recognized by mAb 4F6 that did not cross react with ZIKV. Lastly, a previously unidentified DENV2 NS1-specific epitope, represented by the sequence 127ELHNQTFLIDGPETAEC143, is described in the present study after reaction with mAb 4H2, which also did not cross react with ZIKV. The selection and characterization of the epitope, specificity of anti-NS1 mAbs, may contribute to the development of diagnostic tools able to differentiate DENV and ZIKV infections.
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Affiliation(s)
| | - Rubens Prince Dos Santos Alves
- Laboratório de Desenvolvimento de Vacinas, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
| | - Bruna Alves Caetano
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, 05503-900 SP, Brazil.
| | - Lennon Ramos Pereira
- Laboratório de Desenvolvimento de Vacinas, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
| | - Thais Mitsunari
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, 05503-900 SP, Brazil.
| | - Jaime Henrique Amorim
- Laboratório de Desenvolvimento de Vacinas, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
| | | | | | | | - Ricardo Palacios
- Divisão de Ensaios Clínicos e Farmacovigilância, Instituto Butantan, São Paulo, 05503-900, SP, Brazil.
| | | | - Celso Francisco Hernandes Granato
- Departamento de Medicina, Disciplina de Doenças Infecciosas e Parasitárias, Universidade Federal de São Paulo, São Paulo, 04023-062, SP, Brazil.
| | - Danielle Bruna Leal Oliveira
- Laboratório de Virologia Molecular e Clínica, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
| | - Vanessa Barbosa da Silveira
- Laboratório de Virologia Molecular e Clínica, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
| | - Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, 05503-900 SP, Brazil.
| | - Luís Carlos de Souza Ferreira
- Laboratório de Desenvolvimento de Vacinas, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, 05508-000, SP, Brazil.
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Caetano BA, Rocha LB, Carvalho E, Piazza RMF, Luz D. Immunogenic Domains and Secondary Structure of Escherichia coli Recombinant Secreted Protein Escherichia coli-Secreted Protein B. Front Immunol 2017; 8:477. [PMID: 28484467 PMCID: PMC5402224 DOI: 10.3389/fimmu.2017.00477] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 04/05/2017] [Indexed: 11/24/2022] Open
Abstract
Several pathogenic bacteria are able to induce the attaching and effacing (A/E) lesion. The A/E lesion is caused by effector proteins, such as Escherichia coli-secreted protein B (EspB), responsible together with Escherichia coli-secreted protein D for forming a pore structure on the host cell, which allows the translocation of effector proteins. Different variants of this protein can be found in E. coli strains, and during natural infection or when this protein is injected, this leads to variant-specific production of antibodies, which may not be able to recognize other variants of this bacterial protein. Herein, we describe the production of a hybrid recombinant EspB toxin that comprises all known variants of this protein. This recombinant protein could be useful as an antigen for the production of antibodies with broad-range detection of EspB-bearing bacteria, or as an antigen that could be used in vaccine formulation to generate antibodies against different EspB variants, thereby increasing immunization potential. In addition, the recombinant protein allowed us to analyze its secondary structure, to propose the immunogenic regions of EspB variants, and also to characterize anti-EspB antibodies. Our results suggest that this hybrid protein or a protein composed of the conserved immunogenic regions could be used for a variety of clinical applications.
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Affiliation(s)
- Bruna Alves Caetano
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, São Paulo, Brazil
| | | | - Eneas Carvalho
- Centro de Biotecnologia, Instituto Butantan, São Paulo, São Paulo, Brazil
| | | | - Daniela Luz
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, São Paulo, Brazil
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15
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Gioia-Di Chiacchio RM, Cunha MPV, Sturn RM, Moreno LZ, Moreno AM, Pereira CBP, Martins FH, Franzolin MR, Piazza RMF, Knöbl T. Shiga toxin-producing Escherichia coli (STEC): Zoonotic risks associated with psittacine pet birds in home environments. Vet Microbiol 2016; 184:27-30. [PMID: 26854341 DOI: 10.1016/j.vetmic.2016.01.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 12/03/2015] [Accepted: 01/01/2016] [Indexed: 12/30/2022]
Abstract
Psittacidae are frequently bred as pets worldwide, but little is known about the zoonotic risks of these animals. The objective of this study was to investigate the presence of Shiga toxin-producing Escherichia coli (STEC) in the feces of psittacine birds housed as pets. A total of 171 fecal samples (67 cockatiels, 59 budgerigars, and 45 agapornis) were cultured. Forty-two (E. coli) strains were identified, and the presence of the eae, stx1, and stx2 genes was determined using PCR. The antimicrobial resistance profiles of the STEC strains were determined using the disk diffusion method and phylogenetic analysis according to the new Clermont phylotyping method. Using these methods, 19.4% (8/42) of the STEC strains were determined to be positive for the eae and stx2 genes. The results revealed a STEC frequency of 4.6% in the birds (8/171), with a percentage of 8.47% in budgerigars (5/59), 4.47% in cockatiels (3/67), and 0% in agapornis (0/45). None of the STEC isolates belonged to the O157 serogroup. Most of the strains were classified as sensitive to the 18 antibiotics tested. None of the strains exhibited a multiresistance profile. In the phylogenetic analysis, two strains were classified as non-typeable, three were classified as B2, two were classified as F, and one was classified as Clade I. Seven of the eight STEC strains showed a clonal profile using AFLP. E. coli strains that are stx2(+) plus eae(+) are usually associated with severe human diseases such as hemorrhagic colitis and hemolytic-uremic syndrome. The STEC-positive results indicate the zoonotic risk of breeding psittacidae in home environments.
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Affiliation(s)
- R M Gioia-Di Chiacchio
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil.
| | - M P V Cunha
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil
| | - R M Sturn
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil
| | - L Z Moreno
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil
| | - A M Moreno
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil
| | - C B P Pereira
- Instituto Butantan, Bacteriology Laboratory, São Paulo, Brazil
| | - F H Martins
- Instituto Butantan, Bacteriology Laboratory, São Paulo, Brazil
| | - M R Franzolin
- Instituto Butantan, Bacteriology Laboratory, São Paulo, Brazil
| | - R M F Piazza
- Instituto Butantan, Bacteriology Laboratory, São Paulo, Brazil
| | - T Knöbl
- FMVZ-USP-Faculdade de Medicina Veterinária e Zootecnia, University of São Paulo, São Paulo, Brazil
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Nara JM, Cianciarullo AM, Culler HF, Bueris V, Horton DSPQ, Menezes MA, Franzolin MR, Elias WP, Piazza RMF. Differentiation of typical and atypical enteropathogenic Escherichia coli using colony immunoblot for detection of bundle-forming pilus expression. J Appl Microbiol 2009; 109:35-43. [PMID: 19968733 DOI: 10.1111/j.1365-2672.2009.04625.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
AIMS The aim of study was to develop a colony immunoblot assay to differentiate typical from atypical enteropathogenic Escherichia coli (EPEC) by detection of bundle-forming pilus (BFP) expression. METHODS AND RESULTS Anti-BFP antiserum was raised in rabbits and its reactivity was confirmed by immunoelectron microscopy and by immunoblotting recognizing bundlin, the major pilus repeating subunit. The bacterial isolates tested in the colony immunoblot assay were grown in different media. Proteins from bacterial isolates were transferred to nitrocellulose membrane after treatment with phosphate buffer containing Triton X-100, EDTA and sodium chloride salts. When 24 typical EPEC and 96 isolates including, 72 atypical EPEC, 13 Gram-negative type IV-expressing strains and 11 enterobacteriaceae were cultivated in Dulbecco's Modified Eagle's Medium agar containing fetal bovine serum or in blood agar in the presence of CaCl(2) , they showed a positivity of 92 and 83%, and specificity of 96 and 97%, respectively. CONCLUSION The assay enables reliable identification of BFP-expressing isolates and contributes to the differentiation of typical and atypical EPEC. SIGNIFICANCE AND IMPACT OF THE STUDY The colony immunoblot for BFP detection developed in this study combines the simplicity of an immunoserological assay with the high efficiency of testing a large number of EPEC colonies.
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Affiliation(s)
- J M Nara
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
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17
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Menezes MA, Rocha LB, Koga PCM, Fernandes I, Nara JM, Magalhães CA, Abe CM, Ayala CO, Burgos YK, Elias WP, Castro AFP, Piazza RMF. Identification of enteropathogenic and enterohaemorrhagic Escherichia coli strains by immunoserological detection of intimin. J Appl Microbiol 2009; 108:878-887. [PMID: 19709337 DOI: 10.1111/j.1365-2672.2009.04484.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To evaluate the sensitivity and specificity of polyclonal and monoclonal antibodies (Mabs) against intimin in the detection of enteropathogenic and enterohaemorrhagic Escherichia coli isolates using immunoblotting. METHODS AND RESULTS Polyclonal and Mabs against the intimin-conserved region were raised, and their reactivities were compared in enteropathogenic E. coli (EPEC) and enterohaemorrhagic E. coli (EHEC) isolates using immunoblotting analysis. In comparison with rat antiserum, rabbit anti-intimin IgG-enriched fraction had a stronger recognition pattern to a wide spectrum of intimin types in different EPEC and EHEC serotypes. On the other hand, murine monoclonal IgG2b specific to intimin, with dissociation constant of 1.3x10(-8) mol l(-1), failed in the detection of some of these isolates. CONCLUSION All employed antibodies showed 100% specificity, not reacting with any of the eae-negative isolates. The sensitivity range was according to the employed antisera, and 97% for rabbit anti-intimin IgG-enriched fraction, followed by 92% and 78% sensitivity with rat antisera and Mab. SIGNIFICANCE AND IMPACT OF THE STUDY The rabbit anti-intimin IgG-enriched fraction in immunoblotting analysis is a useful tool for EPEC and EHEC diagnoses.
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Affiliation(s)
- M A Menezes
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - L B Rocha
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - P C M Koga
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - I Fernandes
- Laboratório de Imunopatologia, Instituto Butantan, São Paulo, SP, Brazil
| | - J M Nara
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - C A Magalhães
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - C M Abe
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - C O Ayala
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Y K Burgos
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - W P Elias
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
| | - A F P Castro
- Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - R M F Piazza
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
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Abstract
AIMS To determine the suitability of eight different commercial broth media for Shiga toxin (Stx) production. METHODS AND RESULTS Shiga toxin-producing Escherichia coli (STEC) strains producing Stx1 or Stx2 were grown at 37 degrees C (250 rev min(-1)) for 24 h in brain heart infusion broth, E. coli broth, Evans medium, Luria-Bertani broth, Penassay broth, buffered-peptone water, syncase broth and trypticase soy broth. Toxin production was measured by enzyme-linked immunosorbent assay (ELISA) in polymyxin-treated cell pellets and/or supernatants of cultures, ELISA optical densities reached 1 when isolates were grown for 2-4 h in E. coli broth in the presence of antibiotic. Besides, a collection of STEC-expressing Stx strains was evaluated and the Stx production was assayed in the supernatants and in polymyxin-treated pellets of bacterial growth after 4 h of cultivation in E. coli broth in the presence of antibiotic. CONCLUSIONS The most suitable medium for Stx production was E. coli broth when the bacterial isolates were grown for 4 h in the presence of ciprofloxacin and the Stx production is detected in the supernatant. SIGNIFICANCE AND IMPACT OF THE STUDY This study presents the first comprehensive comparison of different broth media with regard to Stx production to establish optimal culture conditions for STEC detection in routine diagnostic laboratories.
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Affiliation(s)
- L B Rocha
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, SP, Brazil
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19
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Nakano V, Fontes Piazza RM, Avila-Campos MJ. A rapid assay of the sialidase activity in species of the Bacteroides fragilis group by using peanut lectin hemagglutination. Anaerobe 2006; 12:238-41. [PMID: 17011805 DOI: 10.1016/j.anaerobe.2006.07.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2006] [Accepted: 07/24/2006] [Indexed: 12/24/2022]
Abstract
In this study, a novel, simple and rapid hemagglutination assay by using a peanut lectin to detect a neuraminidase activity in strains of the Bacteroides fragilis group was developed. One hundred and fourteen species of the B. fragilis group isolated from children with and without diarrhea and 15 reference strains were evaluated. Neuraminidase production was determined by using the method above described and its inhibition was observed by using galactose. The neuraminidase production was observed in 54 (84.37%) diarrhea and in 43 (86%) non-diarrhea strains. HA titers were ranged from 2 to 32. This neuraminidase assays based on PNA hemagglutination is highly sensitive, reproducible and could be used as a tool to detect the sialidase activity in anaerobic bacteria, particularly, in species of the B. fragilis group.
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Affiliation(s)
- Viviane Nakano
- Laboratório de Anaeróbios, Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil
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20
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Vilhena-Costa AB, Piazza RMF, Nara JM, Trabulsi LR, Martinez MB. Slot blot immunoassay as a tool for plasmid-encoded toxin detection in enteroaggregative Escherichia coli culture supernatants. Diagn Microbiol Infect Dis 2006; 55:101-6. [PMID: 16530374 DOI: 10.1016/j.diagmicrobio.2006.01.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2005] [Revised: 12/13/2005] [Accepted: 01/03/2006] [Indexed: 10/24/2022]
Abstract
Plasmid-encoded toxin (Pet) is a heat-labile enterotoxin encoded in the enteroaggregative Escherichia coli (EAEC) virulence plasmid. Several evidence support the role of this 108-kDa secreted protein in the pathogenesis of EAEC diarrhea. In this study, we standardized a slot blot immunoassay for Pet detection. EAEC culture supernatants were applied onto a polyvinylidene difluoride membrane, and, using rabbit polyclonal Pet antisera, the expression of the toxin by slot blot immunoassay was observed in 9.5% of the isolates studied. In addition, no negative control reacted with Pet antiserum in this assay. This assay is a rapid, specific, reproducible, and low-cost methodology, therefore demonstrating its potential in diagnosing Pet expression. Moreover, we describe for the first time that expression of Pet can be directly detected from EAEC culture supernatants and may be used in clinical laboratorial routine instead of polymerase chain reaction detection of the pet gene, especially in developing countries where the EAEC pathotype has been considered an emerging pathogen.
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Affiliation(s)
- Andréa Bernardes Vilhena-Costa
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 05503-900 São Paulo, Brazil
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21
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Butera D, Piazza RMF, McLane MA, Chammas R, da Silva AMM. Molecular engineering of an EGFP/disintegrin-based integrin marker. Toxicon 2005; 46:178-84. [PMID: 15922386 DOI: 10.1016/j.toxicon.2005.04.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2005] [Revised: 03/30/2005] [Accepted: 04/04/2005] [Indexed: 11/17/2022]
Abstract
Disintegrins are viper venom peptides, which bind integrins with high affinity (10(-8) M) and selectivity. Among them, eristostatin (Er) selectively binds and inhibits alphaIIbbeta3 integrin function. In this work we have engineered an enhanced green fluorescence protein (EGFP)-tagged Er as an alphaIIbbeta3 biomarker to be used in bioassays involving fluorescence detectors. For this, we have first constructed an EGFP bacterial expression vector, which resulted in a 6xHis tag-coding region followed by the EGFP gene and a 3' multiple cloning site (MCS) comprising nine restriction sites. This vector, termed pAZ, was used to clone the Er gene, resulting in a 32 kDa EGFP-Er fusion protein when expressed as characterized by SDS-PAGE and Western blot. Both EGFP-Er and EGFP (expressed from the empty pAZ vector) were purified by immobilized metal affinity chromatography (IMAC) and their fluorescence was measured showing similar values, thus suggesting that the Er portion is not affecting the EGFP activity. EGFP-Er, but not EGFP selectively bound to immobilized platelets as detected by confocal microscopy indicating the preservation of Er disintegrin activity and its potential use as a marker for alphaIIbbeta3 integrin. Our data suggest the use of the pAZ vector for expressing soluble EGFP-labeled proteins and the use of EGFP-fused disintegrins as markers for integrins.
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Affiliation(s)
- Diego Butera
- Laboratório de Imunopatologia, Instituto Butantan, Av. Vital Brasil, 1500, 05503-900 São Paulo, Brazil.
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Menezes CA, Gonçalves DS, Amianti J, Fernandes I, Taddei CR, Koga PCM, Trabulsi LR, Martinez MB, Piazza RMF. Capture immunoassay for LT detection produced by enterotoxigenic Escherichia coli in bacterial isolates. Braz J Microbiol 2003. [DOI: 10.1590/s1517-83822003000500004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Koga PCM, Menezes CA, Lima FA, Nara JM, Magalhães CA, Cianciarullo AM, Ferreira-Júnior JMDC, Trabulsi LR, Mendes-Ledesma MRB, Piazza RMF. Polyclonal anti-intimin antibody: immunological characterization and its use in EPEC and EHEC diagnosis. Braz J Microbiol 2003. [DOI: 10.1590/s1517-83822003000500002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Abstract
Em Santa Catarina, o Inquérito Sorológico Nacional para doença de Chagas (CNPq-SUCAM) revelou positividade de 1,3% em cerca de 74.000 amostras de soro processadas pela reação de imunofluorescência indireta em papel de filtro, com 15 municípios apresentando prevalências de 5,4% a 41,3%. Na presente investigação, em 9 dos municípios com alta prevalência, foram obtidas amostras de sangue, por punção venosa, de 222 indivíduos dos quais 140 haviam sido sorologicamente positivos e 58 negativos no Inquérito Nacional. Em 24 outros indivíduos a reação foi executada pela primeira vez. Os testes sorológicos (imunofluorescência indireta, hemaglutinação indireta, aglutinação direta com e sem 2-mercaptoetanol e fixação do complemento) realizados em 3 diferentes laboratórios evidenciaram 220 soros negativos e apenas 2 positivos. Dados epidenúológicos obtidos nas áreas trabalhadas confirmaram estes resultados negativos. Os resultados discordam daqueles encontrados pelo Inquérito Sorológico Nacional e confirmam a inexistência de focos domiciliares de transmissão da doença de Chagas em Santa Catarina.
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