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Khadka VD, Key FM, Romo-González C, Martínez-Gayosso A, Campos-Cabrera BL, Gerónimo-Gallegos A, Lynn TC, Durán-McKinster C, Coria-Jiménez R, Lieberman TD, García-Romero MT. The Skin Microbiome of Patients With Atopic Dermatitis Normalizes Gradually During Treatment. Front Cell Infect Microbiol 2021; 11:720674. [PMID: 34631601 PMCID: PMC8498027 DOI: 10.3389/fcimb.2021.720674] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [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: 06/04/2021] [Accepted: 09/06/2021] [Indexed: 11/13/2022] Open
Abstract
Background Atopic dermatitis (AD) is characterized by an altered skin microbiome dominantly colonized by S. aureus. Standard treatment includes emollients, anti-inflammatory medications and antiseptics. Objectives To characterize changes in the skin microbiome during treatment for AD. Methods The skin microbiomes of children with moderate-to-severe AD and healthy children were investigated in a longitudinal prospective study. Patients with AD were randomized to receive either standard treatment with emollients and topical corticosteroids or standard treatment with the addition of dilute bleach baths (DBB) and sampled at four visits over a three-month period. At each visit, severity of AD was measured, swabs were taken from four body sites and the composition of the microbiome at those sites was assessed using 16S rRNA amplification. Results We included 14 healthy controls and 28 patients. We found high relative abundances of S. aureus in patients, which correlated with AD severity and reduced apparent alpha diversity. As disease severity improved with treatment, the abundance of S. aureus decreased, gradually becoming more similar to the microbiomes of healthy controls. After treatment, patients who received DBB had a significantly lower abundance of S. aureus than those who received only standard treatment. Conclusions There are clear differences in the skin microbiome of healthy controls and AD patients that diminish with treatment. After three months, the addition of DBB to standard treatment had significantly decreased the S. aureus burden, supporting its use as a therapeutic option. Further study in double-blinded trials is needed.
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Affiliation(s)
- Veda D. Khadka
- Institute for Medical Engineering and Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Felix M. Key
- Institute for Medical Engineering and Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Carolina Romo-González
- Experimental Bacteriology Laboratory, National Institute of Pediatrics, Mexico City, Mexico
| | | | | | | | - Tucker C. Lynn
- Institute for Medical Engineering and Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
| | | | - Rafael Coria-Jiménez
- Experimental Bacteriology Laboratory, National Institute of Pediatrics, Mexico City, Mexico
| | - Tami D. Lieberman
- Institute for Medical Engineering and Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
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Tovar-García A, Angarita-Zapata V, Cazares A, Jasso-Chávez R, Belmont-Díaz J, Sanchez-Torres V, López-Jacome LE, Coria-Jiménez R, Maeda T, García-Contreras R. Characterization of gallium resistance induced in a Pseudomonas aeruginosa cystic fibrosis isolate. Arch Microbiol 2019; 202:617-622. [DOI: 10.1007/s00203-019-01777-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 11/09/2019] [Accepted: 11/20/2019] [Indexed: 11/29/2022]
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Romo-González C, Mendoza E, Mera RM, Coria-Jiménez R, Chico-Aldama P, Gomez-Diaz R, Duque X. Helicobacter pylori infection and serum leptin, obestatin, and ghrelin levels in Mexican schoolchildren. Pediatr Res 2017; 82:607-613. [PMID: 28422951 DOI: 10.1038/pr.2017.69] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 02/19/2017] [Indexed: 12/14/2022]
Abstract
BackgroundThere is little information about the possible role of Helicobacter pylori infection on appetite-regulating peptides in children. This study evaluated the association between H. pylori infection and serum levels of ghrelin, leptin, and obestatin in schoolchildren.MethodsOne hundred seventy-eight schoolchildren, students at boarding schools in Mexico City, participated. H. pylori infection status was determined every 6 months for 1 year by a breath test using 13C-urea; schoolchildren with consistently positive or negative results were selected to participate. Age, sex, and body mass index (BMI) were recorded. Serum concentrations of total ghrelin, leptin, and obestatin via specific enzyme-linked immunosorbent assays were determined.ResultsSchoolchildren with H. pylori infection had lower concentration of leptin, -0.54 pg/ml (95% CI: -0.98 to -0.09), compared to the schoolchildren without infection, after adjustment by age, gender, and BMI. And the children with the infection had a median of obestatin lower in 0.99 ng/ml (95% CI: -1.93 to -0.06) compared with the uninfected children after adjustment by BMI.ConclusionAssociation was found between H. pylori infection and decreased serum concentrations of leptin and obestatin. These results suggest that in schoolchildren, H. pylori infection affects the levels of hormones implicated in regulating appetite and energy homeostasis.
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Affiliation(s)
- Carolina Romo-González
- Experimental Laboratory of Bacteriology, Department of Health, National Institute of Pediatrics, Mexico City, Mexico
| | - Eugenia Mendoza
- Research Unit in Infectious and Parasitic Diseases, Pediatric Hospital, 21st Century National Medical Center, IMSS, Mexico City, Mexico
| | - Robertino M Mera
- Division of Gastroenterology, Hepatology and Nutrition, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Rafael Coria-Jiménez
- Experimental Laboratory of Bacteriology, Department of Health, National Institute of Pediatrics, Mexico City, Mexico
| | - Patricia Chico-Aldama
- Experimental Laboratory of Bacteriology, Department of Health, National Institute of Pediatrics, Mexico City, Mexico
| | - Rita Gomez-Diaz
- Unit of Research in Clinical Epidemiology, Specialty Hospital, 21st Century National Medical Center, IMSS, Mexico City, Mexico
| | - Ximena Duque
- Research Unit in Infectious and Parasitic Diseases, Pediatric Hospital, 21st Century National Medical Center, IMSS, Mexico City, Mexico
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García-Contreras R, Peréz-Eretza B, Jasso-Chávez R, Lira-Silva E, Roldán-Sánchez JA, González-Valdez A, Soberón-Chávez G, Coria-Jiménez R, Martínez-Vázquez M, Alcaraz LD, Maeda T, Wood TK. High variability in quorum quenching and growth inhibition by furanone C-30 in Pseudomonas aeruginosa clinical isolates from cystic fibrosis patients. Pathog Dis 2015; 73:ftv040. [PMID: 26048733 DOI: 10.1093/femspd/ftv040] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2015] [Indexed: 11/13/2022] Open
Abstract
Pseudomonas aeruginosa colonizes the lungs of cystic fibrosis patients causing severe damage. This bacterium is intrinsically resistant to antibiotics and shows resistance against new antimicrobials and its virulence is controlled by the quorum-sensing response. Thus, attenuating its virulence by quorum quenching instead of inhibiting its growth has been proposed to minimize resistance; however, resistance against the canonical quorum quencher furanone C-30 can be achieved by mutations leading to increased efflux. In the present work, the effect of C-30 in the attenuation of the QS-controlled virulence factors elastase and pyocyanin was investigated in 50 isolates from cystic fibrosis patients. The results demonstrate that there is a high variability in the expression of both elastase and pyocyanin and that there are many naturally resistant C-30 strains. We report that the main mechanism of C-30 resistance in these strains was not due to enhanced efflux but a lack of permeability. Moreover, C-30 strongly inhibited the growth of several of the isolates studied, thus imposing high selective pressure for the generation of resistance.
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Affiliation(s)
- Rodolfo García-Contreras
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 México Departamento de Bioquímica, Instituto Nacional de Cardiología, Mexico City 14080, Mexico
| | - Berenice Peréz-Eretza
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 México
| | - Ricardo Jasso-Chávez
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Mexico City 14080, Mexico
| | - Elizabeth Lira-Silva
- Departamento de Bioquímica, Instituto Nacional de Cardiología, Mexico City 14080, Mexico
| | - Jesús Alberto Roldán-Sánchez
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 México
| | - Abigail González-Valdez
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 04510 México
| | - Gloria Soberón-Chávez
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 04510 México
| | - Rafael Coria-Jiménez
- Laboratory of Experimental Bacteriology, National Institute of Pediatrics, Mexico City 04530, Mexico
| | | | - Luis David Alcaraz
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, 04510 México
| | - Toshinari Maeda
- Department of Biological Functions and Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan
| | - Thomas K Wood
- Departments of Chemical Engineering and Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802-4400, USA
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Romo-González C, Consuelo-Sánchez A, Camorlinga-Ponce M, Velázquez-Guadarrama N, García-Zúñiga M, Burgueño-Ferreira J, Coria-Jiménez R. Plasticity Region Genes jhp0940, jhp0945, jhp0947, and jhp0949 of Helicobacter pylori in Isolates from Mexican Children. Helicobacter 2015; 20:231-7. [PMID: 25735460 DOI: 10.1111/hel.12194] [Citation(s) in RCA: 6] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND The genes jhp0940, jhp0945, jhp0947, and jhp0949 belong to the plasticity region of the Helicobacter pylori genome. Due to their prevalence in isolates from patients with gastritis, duodenal ulcer, and gastric cancer, they have been proposed as markers of gastroduodenal diseases. These genes are associated with pro-inflammatory cytokine induction through the NF-κB activation pathway. Nevertheless, the status of these genes is unknown in H. pylori isolates from children. The aim of the present work was to determine the frequency of the jhp0940-jhp0945-jhp0947-jhp0949 genes in H. pylori isolates from children. MATERIALS AND METHODS We identified the jhp0940, jhp0945, jhp0947, and jhp0949 genes and the relationship of each with the virulence factors cagA, cagPAI, and dupA by PCR in 49 isolates of H. pylori from children. The results were corroborated using dot blots. In addition, we compared the prevalence of these genes with the prevalence in adults. RESULTS The prevalence of jhp0940 (53.1%), jhp0945 (44.9%), jhp0947 (77.6%), and jhp0949 (83.7%) was determined in the isolates from children, as was the prevalence of the virulence genes cagA (63.3%), cagPAI (71.4%), and dupA (37.5%). No association was found between the four genes of the plasticity region and the virulence genes. The presence of the intact locus integrated by jhp0940-jhp0945-jhp0947-jhp0949 was very common among the isolates from children. CONCLUSION The genes jhp0940, jhp0947, and jhp0949 were present in more than 50% of the H. pylori isolates, and the joint presence of jhp0940-jhp0945-jhp0947-jhp0949 was very frequent. The frequency of these genes in isolates from children could contribute to the virulence of H. pylori and the evolution of the infection.
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Affiliation(s)
| | - Alejandra Consuelo-Sánchez
- Gastroenterology & Nutrition Department, Children's Hospital of Mexico "Federico Gómez", SSA, México, D.F., México
| | - Margarita Camorlinga-Ponce
- Infectious Diseases Research Unit, Instituto Mexicano del Seguro Social, Mexico City, Mexico, CMN Siglo XXI, IMSS, México, D.F., México
| | | | | | - Juan Burgueño-Ferreira
- International Maize and Wheat Improvement Center, Biometrics and Statistics Unit, Mexico, Mexico
| | - Rafael Coria-Jiménez
- Experimental Bacteriology, National Institute of Pediatrics, SSA, México, D.F., México
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García-Contreras R, Pérez-Eretza B, Lira-Silva E, Jasso-Chávez R, Coria-Jiménez R, Rangel-Vega A, Maeda T, Wood TK. Gallium induces the production of virulence factors inPseudomonas aeruginosa. Pathog Dis 2013; 70:95-8. [DOI: 10.1111/2049-632x.12105] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 09/25/2013] [Accepted: 10/02/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
| | | | | | | | - Rafael Coria-Jiménez
- Laboratory of Experimental Bacteriology; National Institute of Pediatrics; Mexico City Mexico
| | - Adrián Rangel-Vega
- Internal Medicine Department, Speciality Hospital; National Medical Center “Siglo XXI”; IMSS; Mexico City Mexico
| | - Toshinari Maeda
- Department of Biological Functions and Engineering; Kyushu Institute of Technology; Kitakyushu Japan
| | - Thomas K. Wood
- Departments of Chemical Engineering and Biochemistry and Molecular Biology; Pennsylvania State University; University Park PA USA
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Cárdenas-Rodríguez N, Coballase-Urrutia E, Huerta-Gertrudis B, García-Cruz ME, Pedraza-Chaverri J, Coria-Jiménez R, Bandala C, Ruíz-García M. Antioxidant activity of topiramate: an antiepileptic agent. Neurol Sci 2012; 34:741-7. [DOI: 10.1007/s10072-012-1127-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 05/23/2012] [Indexed: 10/28/2022]
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Carmona-Mancilla A, Villegas-Alvarez F, Sumano-López H, Ocampo-Camberos L, Pérez-Guille BE, González Zamora JF, Coria-Jiménez R, Soriano-Rosales RE, Jiménez-Bravo-Luna MA, González-Maciel A. [Experimental bacterial contamination of bile and liver in mongrel dogs: an alternative treatment with cephalone, a hybrid of cephalosporine fluoroquinolone]. Rev Invest Clin 2012; 64:173-181. [PMID: 22991779] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
OBJECTIVES A longitudinal, randomized, single blind study was done to evaluate the efficacy of an antibacterial hybrid molecule (beta-lactamic-fluoroquinolone) named cephalone after biliary-enteric-bypass (BEB). MATERIAL AND METHODS Four groups of mongrel dogs were operated on three consecutive periods. Cultures of bile and liver were obtained and assessed, followed by obliteration of common bile duct and BEB to groups A, B and C. Group D served as a control. Ten days later the group A received conventional treatment based on ampicillin/gentamicin and groups B and C, cephalone in two different concentration schemes during 10 consecutive days. Further samples were processed for bacteria and additional liver biopsies were obtained for histopathological analysis. RESULTS All three treatments reverted bacterial contamination in the liver and most of the bile samples were negative or showed a significant decrease in the number of colony forming units (p = 0.002). Histopathological analysis proved no lesions. CONCLUSIONS Comparison of efficacy among antibacterial treatments revealed undistinguishable efficacy in this short-term assessment of bacterial contamination after BEB in dogs. The use of cephalone could be considered as a viable treatment or prophylaxis in bacterial infections occurring after BEB. Further studies are needed to assess long-term impact of the cephalone in this setting.
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Zárate-Aquino C, Torres-Marcial J, Ortiz-Herrera M, Romero-Ramírez H, Santos-Argumedo L, López-Corella E, Coria-Jiménez R. Identification of Helicobacter pylori strain cagPAI+ and cagPAI- Antigens by IgG antibodies from sera of experimentally colonized meriones unguiculatus (Mongolian gerbils). Helicobacter 2011; 16:200-9. [PMID: 21585605 DOI: 10.1111/j.1523-5378.2011.00831.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Mongolian gerbils that are experimentally infected with Helicobacter pylori develop a chronic inflammation that is similar to natural infections in humans. The aim of this study was to compare the antigens of H. pylori cagPAI+ and cagPAI- strains that are expressed during Meriones unguiculatus colonization. MATERIALS AND METHODS We identified H. pylori cagPAI+ and cagPAI- strain antigens via Western blotting of samples from Mongolian gerbils that were subjected to unique, mixed, and sequential bacterial infections. RESULTS The antigens from the J99/CG3 (cagPAI+) strain had a lower molecular weight than the antigens from the 251F/CG3 (cagPAI-) strain. There were fewer identified antigens in the single unique infections compared with the mixed and sequential infections. The number of recognized antigens that had a frequency of recognition >60% was higher for the simultaneous and sequential infection groups compared with the single infection group. A 57-kDa antigen was present in >60% of the samples and four of the five experimental groups. Antigens specific to each bacterial strain were identified; the 190- and 158-kDa antigens appear to be specific for cagPAI-, and the 70-kDa antigen appears to be specific for cagPAI+. CONCLUSIONS In this study, we identified antigens that are common and specific to the H. pylori cagPAI+ and cagPAI- strains.
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Affiliation(s)
- Carmen Zárate-Aquino
- Laboratory of Experimental Bacteriology, National Institute of Pediatrics, Mexico City, Mexico
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10
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Arredondo-García JL, Soriano-Becerril D, Solórzano-Santos F, Arbo-Sosa A, Coria-Jiménez R, Arzate-Barbosa P. Resistance of uropathogenic bacteria to first-line antibiotics in mexico city: A multicenter susceptibility analysis. Curr Ther Res Clin Exp 2007; 68:120-6. [PMID: 24678125 PMCID: PMC3966000 DOI: 10.1016/j.curtheres.2007.03.005] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/20/2007] [Indexed: 11/16/2022]
Abstract
UNLABELLED Abstract. BACKGROUND Growing antibiotic resistance demands the constant reassessment of antimicrobial efficacy, particularly in countries with wide antibiotic abuse, where higher resistance prevalence is often found. Knowledge of resistance trends is particularly important when prescribing antibiotics empirically, as is usually the case for urinary tract infections (UTIs). Currently, in Mexico City, ampicillin, cotrimoxazole (trimethoprim/sulfamethoxazole), and ciprofloxacin are used as "first-line" antibiotic treatment for UTI. OBJECTIVE The aim of this study was to analyze the resistance of bacterial isolates to antibiotics, with a focus on first-line antibiotics, in Mexican pediatric patients and sexually active or pregnant female outpatients. METHODS In this multicenter susceptibility analysis, bacterial isolates from urine samples collected from pediatric patients and sexually-active or pregnant female outpatients presenting with acute, uncomplicated UTIs in Mexico City from January 2006 through June 2006, were included in the study. Samples were tested for susceptibility to 10 antibiotics by the disk-diffusion method. RESULTS Four-hundred and seventeen bacterial isolates were derived from sexually active or pregnant female outpatients (324 Escherichia coli) and pediatric patients (93 Klebsiella pneumoniae). We found a high prevalence of resistance towards the drugs used as "first-line" when treating UTIs: ampicillin, cotrimoxazole, and ciprofloxacin (79%, 60%, and 24% resistance, respectively). Ninety-eight percent of K pneumoniae isolates were resistant to ampicillin, whereas 66% of the E coli isolates were resistant to cotrimoxazole. Resistance towards third-generation cephalosporins was also high (6%-8% of E coli and 10%-28% of K pneumoniae). This was possibly caused by chromosomal β-lactamases, as 30% of all isolates were also resistant to amoxicillin/clavulanate. In contrast, 98% of the E coli isolates and 84% of the K pneumoniae strains (96% of all isolates) were found to be susceptible to nitrofurantoin, which has been in clinical use for much longer than most other drugs in this study. CONCLUSION In these urine samples from laboratories in Mexico City, resistance of K pneumoniae and E coli isolates to first-line treatment (ampicillin, cotrimoxazole, or ciprofloxacin) of UTI was high, whereas most E coli and K pneumoniae isolates were susceptible to nitrofurantoin and the fourth-generation cephalosporin cefepime. (Curr Ther Res Clin Exp. 2007;68:120-126) Copyright © 2007 Excerpta Medica, Inc.
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Abstract
Exoproteinase production was demonstrated in 64 clinical isolates of S. marcescens. A significant relationship was found between the site of origin (autopsy material, hemocultures, various other sources), proteinase activity, and LD50 of the analyzed isolates. The number of exoproteinases varied during a 14-h incubation in batch cultures; the most frequently found was a 57.5-kDa proteinase which was observed in all analyzed strains. The exoproteinase production was shown to be related to strain virulence.
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Affiliation(s)
- R Coria-Jiménez
- Laboratory of Experimental Bacteriology, National Institute of Pediatrics, México City, 04530 México.
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12
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Ortiz-Herrera M, Gerónimo-Gallegos A, Cuevas-Schacht F, Pérez-Fernández L, Coria-Jiménez R. Caracterización, por RAPD-PCR, de aislados de Pseudomonas aeruginosa obtenidos de pacientes con fibrosis quística. Salud pública Méx 2004; 46:149-57. [PMID: 15176577 DOI: 10.1590/s0036-36342004000200009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/22/2022] Open
Abstract
OBJECTIVE To characterize P. aeruginosa strains isolated from bronchoalveolar lavage fluid of cystic fibrosis (CF) patients over a 3 year period. MATERIAL AND METHODS A prospective follow-up study was carried out in a population of cystic fibrosis patients. The random amplified polymorphic DNA (RAP.D) technique was used to amplify DNA of P. aeruginosa strains isolated from bronchoalveolar lavage fluid samples of five CF patients from the Servicio de Neumología y Cirugía del Tórax del Instituto Nacional de Pediatría (Mexico City Chest Clinic of the National Pediatrics Institute) in Mexico City, between June 1996 and June 2002. Amplification patterns were established for each isolate to accurately identify all strains and to carry out an epidemiological analysis of P. aeruginosa among the selected CF patients. RESULTS Eighteen different DNA amplification patterns were defined and used to identify each P. aeruginosa strain isolated from the different bronchoalveolar lavage samples. No correlation was observed between the different P. aeruginosa strain genotypes and mucoid or non-mucoid phenotypes, as strains with different phenotypes showed similar amplification patterns. Several strains with different amplification patterns were identified in samples obtained from the same patient, suggesting coinfection with ore than one P. aeruginosa strain. Two siblings with CF shared similargenotypes, suggesting the occurrence of cross- contamination. Similar genotypes of P. aeruginosa strains were isolated throughout the study period. CONCLUSION Genotypic characterization of P. aeruginosa strains in CF patients allows more accurate epidemiological analyses of this important host-agent relationship.
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Affiliation(s)
- Maribel Ortiz-Herrera
- Laboratorio de Bacteriologia Experimental, Instituto Nacional de Pediatría, Secretaría de Salud, México, DF, México
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Enciso-Moreno JA, Pernas-Buitrón N, Ortiz-Herrera M, Coria-Jiménez R. Identification of Serratia marcescens populations of nosocomial origin by RAPD-PCR. Arch Med Res 2004; 35:12-7. [PMID: 15036794 DOI: 10.1016/j.arcmed.2003.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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: 01/24/2003] [Accepted: 07/18/2003] [Indexed: 11/20/2022]
Abstract
BACKGROUND Serratia marcescens has been increasingly identified as a cause of infection in the immunocompromised host and in high-mortality-rate nosocomial outbreaks. It is thus important to use identification methods that allow study of the dynamics and evolution of nosocomial S. marcescens strains. The aim of this study was to identify S. marcescens strains isolated from nosocomial outbreaks in two pediatric hospitals by random amplification polymorphic DNA polymerase chain reaction (RAPD-PCR). METHODS RAPD-PCR was used to study five S. marcescens populations isolated from four different nosocomial outbreaks that occurred in two pediatric hospitals. This method was compared with the widely used biotyping system described by Grimont and Grimont. RESULTS The combination of biotypification and RAPD-PCR allowed accurate identification of S. marcescens strains isolated in nosocomial outbreaks at pediatric hospitals; by RAPD-PCR, we were able to analyze clonal variations in S. marcescens populations. We established bacterial dissemination patterns in hospital environments according to hospital administration of medical services and compared changes in bacterial DNA amplification patterns in each hospital related with clonal variations by selective pressures. CONCLUSIONS RAPD-PCR is a useful method to identify S. marcescens strains associated with nosocomial outbreaks.
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Affiliation(s)
- José Antonio Enciso-Moreno
- Laboratorio de Biología Molecular, Unidad de Investigación Médica en Enfermedades Infecciosas y Parasitarias, Centro Médico Nacional Siglo XXI (CMNSXXI), Instituto Mexicano del Seguro Social (IMSS), Mexico City, Mexico
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Affiliation(s)
- R Coria-Jiménez
- Laboratorio de Bacteriología, Instituto Nacional de Pediatría, México, D.F
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15
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Abstract
Aminoglycoside resistance patterns of 147 Serratia marcescens strains of clinical origin were studied. All strains analysed belonged to three different bacterial populations. The periods of study and the institutions the strains were isolated from correlated significantly with the resistance patterns shown by the strains. The most frequent resistance patterns found were the following: ACC (6')-I at the Hospital Infantil de México (Children's Hospital of México), and ANT (2'') + AAC(6')-I at the Instituto Nacional de Pediatría (INPed or National Institute of Pediatrics) in Mexico City. Furthermore, the isolation frequency of aminoglycoside-sensitive strains decreased remarkably at the INPed over a 12-year period. These results suggest that there has been a selection of Serratia marcescens strains that are very resistant to aminoglycosides.
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Affiliation(s)
- R Coria-Jiménez
- Laboratorio de Bacteriología, Instituto Nacional de Pediatría, Delegación Coyoacan, México, D.F
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16
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Coria-Jiménez R, Ortiz-Torres C, Cruz-Camarillo R. Biotyping of Serratia marcescens strains of clinical origin. Rev Latinoam Microbiol 1992; 34:253-8. [PMID: 1345114] [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] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
One hundred and ninety five Serratia marcescens strains of clinical origin isolated at the Children's Hospital of Mexico (Hospital Infantil de México) in 1978 and at the National Institute of Pediatrics (Instituto Nacional de Pediatría) in Mexico City in 1977 and from 1988 to 1989, were studied and compared. All strains were identified using the biotyping system described by Grimont and Grimont, without modification. The most numerous biogroup found was A5/8, and the frequencies of isolation of each biotype varied depending on the institution where it was isolated and the period of study.
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Affiliation(s)
- R Coria-Jiménez
- Microbiology Research Laboratory, National Institute of Pediatrics (Instituto Nacional de Pediatría), Mexico City
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