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Saldaña-Ahuactzi Z, Rodea GE, Cruz-Córdova A, Rodríguez-Ramírez V, Espinosa-Mazariego K, González-Montalvo MA, Ochoa SA, González-Pedrajo B, Eslava-Campos CA, López-Villegas EO, Hernández-Castro R, Arellano-Galindo J, Patiño-López G, Xicohtencatl-Cortes J. Corrigendum: Effects of lng Mutations on LngA Expression, Processing, and CS21 Assembly in Enterotoxigenic Escherichia coli E9034A. Front Microbiol 2017; 8:26. [PMID: 28115921 PMCID: PMC5247707 DOI: 10.3389/fmicb.2017.00026] [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] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Accepted: 01/05/2017] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article on p. 1201 in vol. 7, PMID: 27536289.].
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Affiliation(s)
- Zeus Saldaña-Ahuactzi
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico GómezCiudad de México, Mexico; Instituto de Fisiología Celular at the Universidad Nacional Autónoma de MéxicoCiudad de México, Mexico
| | - Gerardo E Rodea
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico GómezCiudad de México, Mexico; Instituto de Fisiología Celular at the Universidad Nacional Autónoma de MéxicoCiudad de México, Mexico
| | - Ariadnna Cruz-Córdova
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Viridiana Rodríguez-Ramírez
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Karina Espinosa-Mazariego
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Martín A González-Montalvo
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Sara A Ochoa
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Bertha González-Pedrajo
- Departamento de Genética Molecular, Universidad Nacional Autónoma de México Ciudad de México, Mexico
| | - Carlos A Eslava-Campos
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México Ciudad de México, Mexico
| | - Edgar O López-Villegas
- Laboratorio Central de Microscopía, Departamento de Investigación-SEPI, Instituto Politecnico Nacional Ciudad de México, Mexico
| | - Rigoberto Hernández-Castro
- Departamento de Ecología de Agentes Patógenos, Hospital General "Dr. Manuel Gea González," Ciudad de México, Mexico
| | - José Arellano-Galindo
- Departamento de Infectología, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Genaro Patiño-López
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Juan Xicohtencatl-Cortes
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
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Saldaña-Ahuactzi Z, Rodea GE, Cruz-Córdova A, Rodríguez-Ramírez V, Espinosa-Mazariego K, González-Montalvo MA, Ochoa SA, González-Pedrajo B, Eslava-Campos CA, López-Villegas EO, Hernández-Castro R, Arellano-Galindo J, Patiño-López G, Xicohtencatl-Cortes J. Effects of lng Mutations on LngA Expression, Processing, and CS21 Assembly in Enterotoxigenic Escherichia coli E9034A. Front Microbiol 2016; 7:1201. [PMID: 27536289 PMCID: PMC4971541 DOI: 10.3389/fmicb.2016.01201] [Citation(s) in RCA: 5] [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: 03/08/2016] [Accepted: 07/19/2016] [Indexed: 12/22/2022] Open
Abstract
Enterotoxigenic Escherichia coli (ETEC) is a major cause of morbidity in children under 5 years of age in low- and middle-income countries and a leading cause of traveler's diarrhea worldwide. The ability of ETEC to colonize the intestinal epithelium is mediated by fimbrial adhesins, such as CS21 (Longus). This adhesin is a type IVb pilus involved in adherence to intestinal cells in vitro and bacterial self-aggregation. Fourteen open reading frames have been proposed to be involved in CS21 assembly, hitherto only the lngA and lngB genes, coding for the major (LngA) and minor (LngB) structural subunit, have been characterized. In this study, we investigated the role of the LngA, LngB, LngC, LngD, LngH, and LngP proteins in the assembly of CS21 in ETEC strain E9034A. The deletion of the lngA, lngB, lngC, lngD, lngH, or lngP genes, abolished CS21 assembly in ETEC strain E9034A and the adherence to HT-29 cells was reduced 90%, compared to wild-type strain. Subcellular localization prediction of CS21 proteins was similar to other well-known type IV pili homologs. We showed that LngP is the prepilin peptidase of LngA, and that ETEC strain E9034A has another peptidase capable of processing LngA, although with less efficiency. Additionally, we present immuno-electron microscopy images to show that the LngB protein could be localized at the tip of CS21. In conclusion, our results demonstrate that the LngA, LngB, LngC, LngD, LngH, and LngP proteins are essential for CS21 assembly, as well as for bacterial aggregation and adherence to HT-29 cells.
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Affiliation(s)
- Zeus Saldaña-Ahuactzi
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico GómezCiudad de México, Mexico; Instituto de Fisiología Celular at the Universidad Nacional Autónoma de MéxicoCiudad de México, Mexico
| | - Gerardo E Rodea
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico GómezCiudad de México, Mexico; Instituto de Fisiología Celular at the Universidad Nacional Autónoma de MéxicoCiudad de México, Mexico
| | - Ariadnna Cruz-Córdova
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Viridiana Rodríguez-Ramírez
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Karina Espinosa-Mazariego
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Martín A González-Montalvo
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Sara A Ochoa
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Bertha González-Pedrajo
- Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México Ciudad de México, Mexico
| | - Carlos A Eslava-Campos
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México Ciudad de México, Mexico
| | - Edgar O López-Villegas
- Laboratorio Central de Microscopía, Departamento de Investigación-SEPI, Instituto Politecnico Nacional Ciudad de México, Mexico
| | - Rigoberto Hernández-Castro
- Departamento de Ecología de Agentes Patógenos, Hospital General "Dr. Manuel Gea González" Ciudad de México, Mexico
| | - José Arellano-Galindo
- Departamento de Infectología, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Genaro Patiño-López
- Laboratorio de Investigación en Inmunología y Proteómica, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
| | - Juan Xicohtencatl-Cortes
- Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Ciudad de México, Mexico
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Zhang C, Iqbal J, Gómez-Duarte OG. Murine immunization with CS21 pili or LngA major subunit of enterotoxigenic Escherichia coli (ETEC) elicits systemic and mucosal immune responses and inhibits ETEC gut colonization. Vet Microbiol 2016; 202:90-100. [PMID: 26878971 DOI: 10.1016/j.vetmic.2016.02.001] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/24/2016] [Accepted: 02/04/2016] [Indexed: 02/07/2023]
Abstract
CS21 pili of enterotoxigenic Escherichia coli (ETEC) is one of the most prevalent ETEC colonization factors. CS21 major subunit, LngA, mediates ETEC adherence to intestinal cells, and contributes to ETEC pathogenesis in a neonatal mouse infection model. The objectives of this work were to evaluate LngA major subunit purified protein and CS21 purified pili on immunogenicity and protection against ETEC colonization of mice intestine. Recombinant LngA purified protein or purified CS21 pili from E9034A ETEC strain were evaluated for immunogenicity after immunization of C57BL/6 mice. Specific anti-LngA antibodies were detected from mice serum, feces, and intestine fluid samples by ELISA assays. Protection against gut colonization was evaluated on immunized mice orally challenged with wild type E9034A ETEC strain and by subsequent quantification of bacterial colony forming units (CFU) recovered from feces. Recombinant LngA protein and CS21 pili induced specific humoral and mucosal anti-LngA antibodies in the mouse model. CS21 combined with CT delivered intranasally as well as LngA combined with incomplete Freund adjuvant delivered intraperitoneally inhibited ETEC gut colonization in a mouse model. In conclusion, both LngA purified protein and CS21 pili from ETEC are highly immunogenic and may inhibit ETEC intestinal shedding. Our data on immunogenicity and immunoprotection indicates that CS21 is a suitable vaccine candidate for a future multivalent vaccine against ETEC diarrhea.
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Affiliation(s)
- Chengxian Zhang
- Division of Infectious Diseases, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Junaid Iqbal
- Division of Infectious Diseases, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Oscar G Gómez-Duarte
- Division of Infectious Diseases, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, USA.
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Cruz-Córdova A, Espinosa-Mazariego K, Ochoa SA, Saldaña Z, Rodea GE, Cázares-Domínguez V, Rodríguez-Ramírez V, Eslava-Campos CA, Navarro-Ocaña A, Arrellano-Galindo J, Hernández-Castro R, Gómez-Duarte OG, Qadri F, Xicohtencatl-Cortes J. CS21 positive multidrug-resistant ETEC clinical isolates from children with diarrhea are associated with self-aggregation, and adherence. Front Microbiol 2014; 5:709. [PMID: 25646093 PMCID: PMC4297921 DOI: 10.3389/fmicb.2014.00709] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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: 10/08/2014] [Accepted: 11/28/2014] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Enterotoxigenic Escherichia coli (ETEC) colonize the human intestinal mucosa using pili and non-pili colonization factors (CFs). CS21 (also designated Longus) is one of the most prevalent CFs encoded by a 14 kb lng DNA cluster located in a virulence plasmid of ETEC; yet limited information is available on the prevalence of CS21 positive ETEC isolates in different countries. The aim of this study was to evaluate the prevalence of CS21 among ETEC clinical isolates from Mexican and Bangladeshi children under 5 years old with diarrhea and to determine the phenotypic and genotypic features of these isolates. METHODS ETEC clinical isolates positive to lngA gene were characterized by genotype, multidrug-resistance, self-aggregation, biofilm formation, and adherence to HT-29 cell line. RESULTS A collection of 303 E. coli clinical isolates were analyzed, the 81.51% (247/303) were identified as ETEC, 30.76% (76/247) were st (+)/lt (+), and 25.10% (62/247) were positive for the lngA gene. Among the lngA (+) ETECs identified, 50% of isolates (31/62) were positive for LngA protein. The most frequent serotype was O128ac:H12 found in 19.35% (12/62) of lngA (+) ETEC studied. Multidrug-resistance (MDR) lngA (+) ETEC isolates was identified in 65% (39/60), self-aggregation in 48.38% (30/62), and biofilm formation in 83.87% (52/62). ETEC lngA (+) isolates were able to adhere to HT-29 cells at different levels. Two lngA isogenic mutants were constructed in the ETEC E9034A and ETEC73332 clinical isolate, showing a 77% and 98% reduction in adherence, respectively with respect to the wild type. CONCLUSION ETEC isolates that have the lngA gene showed features associated with self-aggregation, and adherence to HT-29 cells, important characteristics in the human gut colonization process and pathogenesis.
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Affiliation(s)
- Ariadnna Cruz-Córdova
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Karina Espinosa-Mazariego
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Sara A Ochoa
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Zeus Saldaña
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico ; Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Gerardo E Rodea
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico ; Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Vicenta Cázares-Domínguez
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Viridiana Rodríguez-Ramírez
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Carlos A Eslava-Campos
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Patogenicidad Bacteriana, Hospital Infantil de México Federico Gómez Mexico City, Mexico ; Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Armando Navarro-Ocaña
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - José Arrellano-Galindo
- Laboratorio de Infectología, Departamento de Infectología, Hospital Infantil de México Federico Gómez Mexico City, Mexico
| | - Rigoberto Hernández-Castro
- Departamento de Ecología de Agentes Patógenos, Hospital General "Dr. Manuel Gea González," Mexico City, Mexico
| | - Oscar G Gómez-Duarte
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Vanderbilt University School of Medicine Nashville, TN, USA
| | - Firdausi Qadri
- Centre for Vaccine Sciences, International Centre for Diarrhoeal Disease Research Dhaka, Bangladesh
| | - Juan Xicohtencatl-Cortes
- Unidad de Hemato-Onocología e Investigación, Laboratorio de Investigación en Bacteriología Intestinal, Hospital Infantil de México Federico Gómez Mexico City, Mexico
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