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Ruelas Castillo J, Neupane P, Karanika S, Krug S, Quijada D, Garcia A, Ayeh S, Yilma A, Costa DL, Sher A, Fotouhi N, Serbina N, Karakousis PC. The heme oxygenase-1 metalloporphyrin inhibitor stannsoporfin enhances the bactericidal activity of a novel regimen for multidrug-resistant tuberculosis in a murine model. Antimicrob Agents Chemother 2024; 68:e0104323. [PMID: 38132181 PMCID: PMC10848751 DOI: 10.1128/aac.01043-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/17/2023] [Indexed: 12/23/2023] Open
Abstract
Multidrug-resistant (MDR) Mycobacterium tuberculosis (Mtb) poses significant challenges to global tuberculosis (TB) control efforts. Host-directed therapies (HDTs) offer a novel approach to TB treatment by enhancing immune-mediated clearance of Mtb. Prior preclinical studies found that the inhibition of heme oxygenase-1 (HO-1), an enzyme involved in heme metabolism, with tin-protoporphyrin IX (SnPP) significantly reduced mouse lung bacillary burden when co-administered with the first-line antitubercular regimen. Here, we evaluated the adjunctive HDT activity of a novel HO-1 inhibitor, stannsoporfin (SnMP), in combination with a novel MDR-TB regimen comprising a next-generation diarylquinoline, TBAJ-876 (S), pretomanid (Pa), and a new oxazolidinone, TBI-223 (O) (collectively, SPaO), in Mtb-infected BALB/c mice. After 4 weeks of treatment, SPaO + SnMP 5mg/kg reduced mean lung bacillary burden by an additional 0.69 log10 (P = 0.01) relative to SPaO alone. As early as 2 weeks post-treatment initiation, SnMP adjunctive therapy differentially altered the expression of pro-inflammatory cytokine genes and CD38, a marker of M1 macrophages. Next, we evaluated the sterilizing potential of SnMP adjunctive therapy in a mouse model of microbiological relapse. After 6 weeks of treatment, SPaO + SnMP 10mg/kg reduced lung bacterial burdens to 0.71 ± 0.23 log10 colony-forming units (CFUs), a 0.78 log-fold greater decrease in lung CFU compared to SpaO alone (P = 0.005). However, adjunctive SnMP did not reduce microbiological relapse rates after 5 or 6 weeks of treatment. SnMP was well tolerated and did not significantly alter gross or histological lung pathology. SnMP is a promising HDT candidate requiring further study in combination with regimens for drug-resistant TB.
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Affiliation(s)
- Jennie Ruelas Castillo
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Pranita Neupane
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Styliani Karanika
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Stefanie Krug
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Darla Quijada
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Andrew Garcia
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Samuel Ayeh
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Addis Yilma
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Diego L. Costa
- Departmento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Alan Sher
- Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | | | | | - Petros C. Karakousis
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Castillo JR, Neupane P, Karanika S, Krug S, Quijada D, Garcia A, Ayeh S, Yilma A, Costa DL, Sher A, Fotouhi N, Serbina N, Karakousis PC. The heme oxygenase-1 metalloporphyrin inhibitor stannsoporfin enhances the bactericidal activity of a novel regimen for multidrug-resistant tuberculosis in a murine model. bioRxiv 2023:2023.08.09.552716. [PMID: 37609351 PMCID: PMC10441415 DOI: 10.1101/2023.08.09.552716] [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] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Multidrug-resistant (MDR) Mycobacterium tuberculosis (Mtb) poses significant challenges to global tuberculosis (TB) control efforts. Host-directed therapies (HDT) offer a novel approach for TB treatment by enhancing immune-mediated clearance of Mtb. Prior preclinical studies found that inhibition of heme oxygenase-1 (HO-1), an enzyme involved in heme metabolism, with tin-protoporphyrin IX (SnPP) significantly reduced mouse lung bacillary burden when co-administered with the first-line antitubercular regimen. Here we evaluated the adjunctive HDT activity of a novel HO-1 inhibitor, stannsoporfin (SnMP), in combination with a novel MDR-TB regimen comprising a next-generation diarylquinoline, TBAJ-876 (S), pretomanid (Pa), and a new oxazolidinone, TBI-223 (O) (collectively, SPaO) in Mtb-infected BALB/c mice. After 4 weeks of treatment, SPaO + SnMP 5 mg/kg reduced mean lung bacillary burden by an additional 0.69 log10 (P=0.01) relative to SPaO alone. As early as 2 weeks post-treatment initiation, SnMP adjunctive therapy differentially altered the expression of pro-inflammatory cytokine genes, and CD38, a marker of M1 macrophages. Next, we evaluated the sterilizing potential of SnMP adjunctive therapy in a mouse model of microbiological relapse. After 6 weeks of treatment, SPaO + SnMP 10 mg/kg reduced lung bacterial burdens to 0.71 ± 0.23 log10 CFU, a 0.78 log-fold greater decrease in lung CFU compared to SpaO alone (P=0.005). However, adjunctive SnMP did not reduce microbiological relapse rates after 5 or 6 weeks of treatment. SnMP was well tolerated and did not significantly alter gross or histological lung pathology. SnMP is a promising HDT candidate requiring further study in combination with regimens for drug-resistant TB.
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Affiliation(s)
- Jennie Ruelas Castillo
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Pranita Neupane
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Styliani Karanika
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Stefanie Krug
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Microbiology, University of Washington School of Medicine, Seattle, WA 98195, USA
| | - Darla Quijada
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Andrew Garcia
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Samuel Ayeh
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Addis Yilma
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Diego L. Costa
- Departmento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Alan Sher
- Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | | | | | - Petros C. Karakousis
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
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Russell SL, Castillo JR, Sullivan WT. Wolbachia endosymbionts manipulate the self-renewal and differentiation of germline stem cells to reinforce fertility of their fruit fly host. PLoS Biol 2023; 21:e3002335. [PMID: 37874788 PMCID: PMC10597519 DOI: 10.1371/journal.pbio.3002335] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 09/14/2023] [Indexed: 10/26/2023] Open
Abstract
The alphaproteobacterium Wolbachia pipientis infects arthropod and nematode species worldwide, making it a key target for host biological control. Wolbachia-driven host reproductive manipulations, such as cytoplasmic incompatibility (CI), are credited for catapulting these intracellular bacteria to high frequencies in host populations. Positive, perhaps mutualistic, reproductive manipulations also increase infection frequencies, but are not well understood. Here, we identify molecular and cellular mechanisms by which Wolbachia influences the molecularly distinct processes of germline stem cell (GSC) self-renewal and differentiation. We demonstrate that wMel infection rescues the fertility of flies lacking the translational regulator mei-P26 and is sufficient to sustain infertile homozygous mei-P26-knockdown stocks indefinitely. Cytology revealed that wMel mitigates the impact of mei-P26 loss through restoring proper pMad, Bam, Sxl, and Orb expression. In Oregon R files with wild-type fertility, wMel infection elevates lifetime egg hatch rates. Exploring these phenotypes through dual-RNAseq quantification of eukaryotic and bacterial transcripts revealed that wMel infection rescues and offsets many gene expression changes induced by mei-P26 loss at the mRNA level. Overall, we show that wMel infection beneficially reinforces host fertility at mRNA, protein, and phenotypic levels, and these mechanisms may promote the emergence of mutualism and the breakdown of host reproductive manipulations.
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Affiliation(s)
- Shelbi L. Russell
- Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, California, United States of America
| | - Jennie Ruelas Castillo
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, Maryland, United States of America
| | - William T. Sullivan
- Department of Molecular, Cell, and Developmental Biology, University of California Santa Cruz, Santa Cruz, California, United States of America
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Karanika S, Gordy JT, Neupane P, Karantanos T, Ruelas Castillo J, Quijada D, Comstock K, Sandhu AK, Kapoor AR, Hui Y, Ayeh SK, Tasneen R, Krug S, Danchik C, Wang T, Schill C, Markham RB, Karakousis PC. An intranasal stringent response vaccine targeting dendritic cells as a novel adjunctive therapy against tuberculosis. Front Immunol 2022; 13:972266. [PMID: 36189260 PMCID: PMC9523784 DOI: 10.3389/fimmu.2022.972266] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 08/31/2022] [Indexed: 01/26/2023] Open
Abstract
Lengthy tuberculosis (TB) treatment is required to overcome the ability of a subpopulation of persistent Mycobacterium tuberculosis (Mtb) to remain in a non-replicating, antibiotic-tolerant state characterized by metabolic remodeling, including induction of the RelMtb-mediated stringent response. We developed a novel therapeutic DNA vaccine containing a fusion of the relMtb gene with the gene encoding the immature dendritic cell-targeting chemokine, MIP-3α/CCL20. To augment mucosal immune responses, intranasal delivery was also evaluated. We found that intramuscular delivery of the MIP-3α/relMtb (fusion) vaccine or intranasal delivery of the relMtb (non-fusion) vaccine potentiate isoniazid activity more than intramuscular delivery of the DNA vaccine expressing relMtb alone in a chronic TB mouse model (absolute reduction of Mtb burden: 0.63 log10 and 0.5 log10 colony-forming units, respectively; P=0.0002 and P=0.0052), inducing pronounced Mtb-protective immune signatures. The combined approach involving intranasal delivery of the DNA MIP-3α/relMtb fusion vaccine demonstrated the greatest mycobactericidal activity together with isoniazid when compared to each approach alone (absolute reduction of Mtb burden: 1.13 log10, when compared to the intramuscular vaccine targeting relMtb alone; P<0.0001), as well as robust systemic and local Th1 and Th17 responses. This DNA vaccination strategy may be a promising adjunctive approach combined with standard therapy to shorten curative TB treatment, and also serves as proof of concept for treating other chronic bacterial infections.
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Affiliation(s)
- Styliani Karanika
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - James T. Gordy
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Pranita Neupane
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Theodoros Karantanos
- Division of Hematological Malignancies, Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University Hospital, Baltimore, MD, United States
| | - Jennie Ruelas Castillo
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Darla Quijada
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Kaitlyn Comstock
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Avinaash K. Sandhu
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Aakanksha R. Kapoor
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Yinan Hui
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Samuel K. Ayeh
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Rokeya Tasneen
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Stefanie Krug
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Carina Danchik
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Tianyin Wang
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Courtney Schill
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Richard B. Markham
- Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States,*Correspondence: Petros C. Karakousis, ; Richard B. Markham,
| | - Petros C. Karakousis
- Division of Infectious Diseases, Department of Medicine, The Johns Hopkins Hospital, Baltimore, MD, United States,W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States,*Correspondence: Petros C. Karakousis, ; Richard B. Markham,
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5
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Chidambaram V, Tun NL, Majella MG, Ruelas Castillo J, Ayeh SK, Kumar A, Neupane P, Sivakumar RK, Win EP, Abbey EJ, Wang S, Zimmerman A, Blanck J, Gupte A, Wang JY, Karakousis PC. Male Sex Is Associated With Worse Microbiological and Clinical Outcomes Following Tuberculosis Treatment: A Retrospective Cohort Study, a Systematic Review of the Literature, and Meta-analysis. Clin Infect Dis 2021; 73:1580-1588. [PMID: 34100919 PMCID: PMC8563313 DOI: 10.1093/cid/ciab527] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Although the incidence of tuberculosis is higher in men than in women, the relationship of sex with tuberculosis treatment outcomes has not been adequately studied. METHODS We performed a retrospective cohort study and a systematic review and meta-analysis of observational studies during the last 10 years to assess sex differences in clinical and microbiological outcomes in tuberculosis. RESULTS In our cohort of 2894 Taiwanese patients with drug-susceptible pulmonary tuberculosis (1975 male and 919 female), male patients had higher adjusted hazards of 9-month mortality due to all causes (hazard ratio, 1.43 [95% confidence interval (CI), 1.03-1.98]) and infections (1.70 [1.09-2.64]) and higher adjusted odds of 2-month sputum culture positivity (odds ratio [OR], 1.56 [95% CI, 1.05-2.33]) compared with female patients. Smear positivity at 2 months did not differ significantly (OR, 1.27 [95% CI, .71-2.27]) between the sexes. Among 7896 articles retrieved, 398 were included in our systematic review describing a total of 3 957 216 patients. The odds of all-cause mortality were higher in men than in women in the pooled unadjusted (OR, 1.26 [95% CI, 1.19-1.34]) and adjusted (1.31 [1.18-1.45]) analyses. Men had higher pooled odds of sputum culture (OR, 1.44 [95% CI, 1.14-1.81]) and sputum smear (1.58 [1.41-1.77]) positivity, both at the end of the intensive phase and on completion of treatment. CONCLUSIONS Our retrospective cohort showed that male patients with tuberculosis have higher 9-month all-cause and infection-related mortality, with higher 2-month sputum culture positivity after adjustment for confounding factors. In our meta-analysis, male patients showed higher all-cause and tuberculosis-related mortality and higher sputum culture and smear positivity rates during and after tuberculosis treatment.
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Affiliation(s)
- Vignesh Chidambaram
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Nyan Lynn Tun
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Marie Gilbert Majella
- Department of Preventive and Social Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Jennie Ruelas Castillo
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Samuel K Ayeh
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Amudha Kumar
- Department of Internal Medicine, University of Arkansas for Medical Sciences, Arkansas, USA
| | - Pranita Neupane
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Ranjith Kumar Sivakumar
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, China
| | - Ei Phyo Win
- Department of Pathology, Yangon Children’s Hospital, Yangon, Myanmar
| | - Enoch J Abbey
- Division of Endocrinology, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Siqing Wang
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Alyssa Zimmerman
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Jaime Blanck
- Welch Medical Library, Johns Hopkins University, Baltimore, Maryland, USA
| | - Akshay Gupte
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Jann-Yuan Wang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Petros C Karakousis
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Dhakal S, Ruiz-Bedoya CA, Zhou R, Creisher PS, Villano JS, Littlefield K, Ruelas Castillo J, Marinho P, Jedlicka AE, Ordonez AA, Bahr M, Majewska N, Betenbaugh MJ, Flavahan K, Mueller ARL, Looney MM, Quijada D, Mota F, Beck SE, Brockhurst J, Braxton AM, Castell N, Stover M, D’Alessio FR, Metcalf Pate KA, Karakousis PC, Mankowski JL, Pekosz A, Jain SK, Klein SL. Sex Differences in Lung Imaging and SARS-CoV-2 Antibody Responses in a COVID-19 Golden Syrian Hamster Model. mBio 2021; 12:e0097421. [PMID: 34253053 PMCID: PMC8406232 DOI: 10.1128/mbio.00974-21] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [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: 03/31/2021] [Accepted: 06/10/2021] [Indexed: 12/15/2022] Open
Abstract
In the coronavirus disease 2019 (COVID-19) pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), more severe outcomes are reported in males than in females, including hospitalizations and deaths. Animal models can provide an opportunity to mechanistically interrogate causes of sex differences in the pathogenesis of SARS-CoV-2. Adult male and female golden Syrian hamsters (8 to 10 weeks of age) were inoculated intranasally with 105 50% tissue culture infective dose (TCID50) of SARS-CoV-2/USA-WA1/2020 and euthanized at several time points during the acute (i.e., virus actively replicating) and recovery (i.e., after the infectious virus has been cleared) phases of infection. There was no mortality, but infected male hamsters experienced greater morbidity, losing a greater percentage of body mass, developed more extensive pneumonia as noted on chest computed tomography, and recovered more slowly than females. Treatment of male hamsters with estradiol did not alter pulmonary damage. Virus titers in respiratory tissues, including nasal turbinates, trachea, and lungs, and pulmonary cytokine concentrations, including interferon-β (IFN-β) and tumor necrosis factor-α (TNF-α), were comparable between the sexes. However, during the recovery phase of infection, females mounted 2-fold greater IgM, IgG, and IgA responses against the receptor-binding domain of the spike protein (S-RBD) in both plasma and respiratory tissues. Female hamsters also had significantly greater IgG antibodies against whole-inactivated SARS-CoV-2 and mutant S-RBDs as well as virus-neutralizing antibodies in plasma. The development of an animal model to study COVID-19 sex differences will allow for a greater mechanistic understanding of the SARS-CoV-2-associated sex differences seen in the human population. IMPORTANCE Men experience more severe outcomes from coronavirus disease 2019 (COVID-19) than women. Golden Syrian hamsters were used to explore sex differences in the pathogenesis of a human isolate of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). After inoculation, male hamsters experienced greater sickness, developed more severe lung pathology, and recovered more slowly than females. Sex differences in disease could not be reversed by estradiol treatment in males and were not explained by either virus replication kinetics or the concentrations of inflammatory cytokines in the lungs. During the recovery period, antiviral antibody responses in the respiratory tract and plasma, including to newly emerging SARS-CoV-2 variants, were greater in female than in male hamsters. Greater lung pathology during the acute phase combined with lower antiviral antibody responses during the recovery phase of infection in males than in females illustrate the utility of golden Syrian hamsters as a model to explore sex differences in the pathogenesis of SARS-CoV-2 and vaccine-induced immunity and protection.
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Affiliation(s)
- Santosh Dhakal
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Camilo A. Ruiz-Bedoya
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ruifeng Zhou
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Patrick S. Creisher
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Jason S. Villano
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Kirsten Littlefield
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | | | - Paula Marinho
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Anne E. Jedlicka
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Alvaro A. Ordonez
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Melissa Bahr
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Natalia Majewska
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Michael J. Betenbaugh
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Kelly Flavahan
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alice R. L. Mueller
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Monika M. Looney
- Department of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Darla Quijada
- Department of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Filipa Mota
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Sarah E. Beck
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Jacqueline Brockhurst
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Alicia M. Braxton
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Natalie Castell
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Mitchel Stover
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Franco R. D’Alessio
- Department of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Kelly A. Metcalf Pate
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Petros C. Karakousis
- Department of Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Joseph L. Mankowski
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Andrew Pekosz
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Molecular and Comparative Pathobiology, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Sanjay K. Jain
- Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Sabra L. Klein
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Chidambaram V, Ruelas Castillo J, Kumar A, Wei J, Wang S, Majella MG, Gupte A, Wang JY, Karakousis PC. The association of atherosclerotic cardiovascular disease and statin use with inflammation and treatment outcomes in tuberculosis. Sci Rep 2021; 11:15283. [PMID: 34315941 PMCID: PMC8316554 DOI: 10.1038/s41598-021-94590-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 05/12/2021] [Accepted: 07/06/2021] [Indexed: 11/10/2022] Open
Abstract
Tuberculosis (TB) and atherosclerotic cardiovascular disease (ASCVD) have a close epidemiological and pathogenetic overlap. Thus, it becomes essential to understand the relationship between ASCVD and TB outcomes. From our retrospective cohort on drug-susceptible TB patients at the National Taiwan University Hospital, we assessed the association of pre-existing ASCVD (coronary artery disease (CAD) and atherothrombotic stroke (ATS)) with 9-month all-cause and infection-related mortality and the extent of mediation by systemic inflammatory markers. We determined the effect of pre-existing ASCVD on 2-month sputum microbiological status. Among ASCVD patients, we assessed the association of statin use on mortality. Nine-month all-cause mortality was higher in CAD patients with prior acute myocardial infarction (CAD+AMI+) (adjusted HR 2.01, 95%CI 1.38–3.00) and ATS patients (aHR 2.79, 95%CI 1.92–4.07) and similarly, for infection-related mortality was higher in CAD+AMI+ (aHR 1.95, 95%CI 1.17–3.24) and ATS (aHR 2.04, 95%CI 1.19–3.46) after adjusting for confounding factors. Pre-existing CAD (AMI- or AMI+) or ATS did not change sputum culture conversion or sputum smear AFB positivity at 2 months. The CAD+AMI+ group had significantly higher levels of CRP at TB diagnosis in the multivariable linear regression analysis (Adjusted B(SE) 1.24(0.62)). CRP mediated 66% (P = 0.048) and 25% (P = 0.033) of the association all-cause mortality with CAD+AMI− and CAD+AMI+, respectively. In summary, patients with ASCVD have higher hazards of 9-month all-cause and infection-related mortality, with elevated serum inflammation mediating one to three-quarters of this association when adjusted for confounders. Statin use was associated with lower all-cause mortality among patients with ASCVD.
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Affiliation(s)
- Vignesh Chidambaram
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA
| | - Jennie Ruelas Castillo
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA
| | - Amudha Kumar
- Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Justin Wei
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA
| | - Siqing Wang
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA
| | - Marie Gilbert Majella
- Department of Preventive and Social Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry, India
| | - Akshay Gupte
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA
| | - Jann-Yuan Wang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Petros C Karakousis
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Koch Cancer Research Building, 1550 Orleans St., Room 110, Baltimore, MD, 21287, USA. .,Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
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8
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Chidambaram V, Zhou L, Ruelas Castillo J, Kumar A, Ayeh SK, Gupte A, Wang JY, Karakousis PC. Higher Serum Cholesterol Levels Are Associated With Reduced Systemic Inflammation and Mortality During Tuberculosis Treatment Independent of Body Mass Index. Front Cardiovasc Med 2021; 8:696517. [PMID: 34239907 PMCID: PMC8257940 DOI: 10.3389/fcvm.2021.696517] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 05/19/2021] [Indexed: 01/04/2023] Open
Abstract
Background: Lipids play a central role in the pathogenesis of tuberculosis (TB). The effect of serum lipid levels on TB treatment (ATT) outcomes and their association with serum inflammatory markers have not yet been characterized. Methods: Our retrospective cohort study on drug-susceptible TB patients, at the National Taiwan University Hospital, assessed the association of baseline serum lipid levels such as low-density lipoprotein (LDL), high-density lipoprotein (HDL), total cholesterol (TC) and triglycerides (TG) with all-cause and infection-related mortality during first 9 months of ATT and baseline inflammatory markers namely C-reactive protein (CRP), total leukocyte count (WBC), and neutrophil-lymphocyte ratio (NL ratio). Results: Among 514 patients, 129 (26.6%) died due to any-cause and 72 (14.0%) died of infection. Multivariable Cox-regression showed a lower adjusted hazard ratio (aHR) of all-cause mortality in the 3rd tertiles of HDL (aHR 0.17, 95% CI 0.07-0.44) and TC (aHR 0.30, 95% CI 0.14-0.65), and lower infection-related mortality in the 3rd tertile of HDL (aHR 0.30, 95% CI 0.14-0.65) and TC (aHR 0.30, 95% CI 0.14-0.65) compared to the 1st tertile. The 3rd tertiles of LDL and TG showed no association in multivariable analysis. Similarly, 3rd tertiles of HDL and TC had lower levels of baseline inflammatory markers such as CRP, WBC, and NL ratio using linear regression analysis. Body mass index (BMI) did not show evidence of confounding or effect modification. Conclusions: Higher baseline serum cholesterol levels were associated with lower hazards of all-cause and infection-related mortality and lower levels of inflammatory markers in TB patients. BMI did not modify or confound this association.
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Affiliation(s)
- Vignesh Chidambaram
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Lucas Zhou
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Jennie Ruelas Castillo
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Amudha Kumar
- Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Samuel K. Ayeh
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Akshay Gupte
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Jann-Yuan Wang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Petros C. Karakousis
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, United States
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
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9
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Parker H, Lorenc R, Ruelas Castillo J, Karakousis PC. Mechanisms of Antibiotic Tolerance in Mycobacterium avium Complex: Lessons From Related Mycobacteria. Front Microbiol 2020; 11:573983. [PMID: 33101247 PMCID: PMC7554310 DOI: 10.3389/fmicb.2020.573983] [Citation(s) in RCA: 8] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 09/01/2020] [Indexed: 11/13/2022] Open
Abstract
Mycobacterium avium complex (MAC) species are the most commonly isolated nontuberculous mycobacteria to cause pulmonary infections worldwide. The lengthy and complicated therapy required to cure lung disease due to MAC is at least in part due to the phenomenon of antibiotic tolerance. In this review, we will define antibiotic tolerance and contrast it with persistence and antibiotic resistance. We will discuss physiologically relevant stress conditions that induce altered metabolism and antibiotic tolerance in mycobacteria. Next, we will review general molecular mechanisms underlying bacterial antibiotic tolerance, particularly those described for MAC and related mycobacteria, including Mycobacterium tuberculosis, with a focus on genes containing significant sequence homology in MAC. An improved understanding of antibiotic tolerance mechanisms can lay the foundation for novel approaches to target antibiotic-tolerant mycobacteria, with the goal of shortening the duration of curative treatment and improving survival in patients with MAC.
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Affiliation(s)
- Harley Parker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Rachel Lorenc
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Jennie Ruelas Castillo
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Petros C Karakousis
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
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10
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Russell SL, Pepper-Tunick E, Svedberg J, Byrne A, Ruelas Castillo J, Vollmers C, Beinart RA, Corbett-Detig R. Horizontal transmission and recombination maintain forever young bacterial symbiont genomes. PLoS Genet 2020; 16:e1008935. [PMID: 32841233 PMCID: PMC7473567 DOI: 10.1371/journal.pgen.1008935] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [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: 11/10/2019] [Revised: 09/04/2020] [Accepted: 06/16/2020] [Indexed: 12/30/2022] Open
Abstract
Bacterial symbionts bring a wealth of functions to the associations they participate in, but by doing so, they endanger the genes and genomes underlying these abilities. When bacterial symbionts become obligately associated with their hosts, their genomes are thought to decay towards an organelle-like fate due to decreased homologous recombination and inefficient selection. However, numerous associations exist that counter these expectations, especially in marine environments, possibly due to ongoing horizontal gene flow. Despite extensive theoretical treatment, no empirical study thus far has connected these underlying population genetic processes with long-term evolutionary outcomes. By sampling marine chemosynthetic bacterial-bivalve endosymbioses that range from primarily vertical to strictly horizontal transmission, we tested this canonical theory. We found that transmission mode strongly predicts homologous recombination rates, and that exceedingly low recombination rates are associated with moderate genome degradation in the marine symbionts with nearly strict vertical transmission. Nonetheless, even the most degraded marine endosymbiont genomes are occasionally horizontally transmitted and are much larger than their terrestrial insect symbiont counterparts. Therefore, horizontal transmission and recombination enable efficient natural selection to maintain intermediate symbiont genome sizes and substantial functional genetic variation.
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Affiliation(s)
- Shelbi L. Russell
- Department of Molecular Cellular and Developmental Biology. University of California Santa Cruz, Santa Cruz, California, United States of America
- Department of Biomolecular Engineering. University of California Santa Cruz, Santa Cruz, California, United States of America
| | - Evan Pepper-Tunick
- Department of Biomolecular Engineering. University of California Santa Cruz, Santa Cruz, California, United States of America
- Genomics Institute, University of California, Santa Cruz, California, United States of America
| | - Jesper Svedberg
- Department of Biomolecular Engineering. University of California Santa Cruz, Santa Cruz, California, United States of America
- Genomics Institute, University of California, Santa Cruz, California, United States of America
| | - Ashley Byrne
- Department of Molecular Cellular and Developmental Biology. University of California Santa Cruz, Santa Cruz, California, United States of America
| | - Jennie Ruelas Castillo
- Department of Molecular Cellular and Developmental Biology. University of California Santa Cruz, Santa Cruz, California, United States of America
| | - Christopher Vollmers
- Department of Biomolecular Engineering. University of California Santa Cruz, Santa Cruz, California, United States of America
- Genomics Institute, University of California, Santa Cruz, California, United States of America
| | - Roxanne A. Beinart
- Graduate School of Oceanography. University of Rhode Island, Narragansett, Rhode Island, United States of America
| | - Russell Corbett-Detig
- Department of Biomolecular Engineering. University of California Santa Cruz, Santa Cruz, California, United States of America
- Genomics Institute, University of California, Santa Cruz, California, United States of America
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11
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Abstract
Bacteria participate in a wide diversity of symbiotic associations with eukaryotic hosts that require precise interactions for bacterial recognition and persistence. Most commonly, host-associated bacteria interfere with host gene expression to modulate the immune response to the infection. However, many of these bacteria also interfere with host cellular differentiation pathways to create a hospitable niche, resulting in the formation of novel cell types, tissues, and organs. In both of these situations, bacterial symbionts must interact with eukaryotic regulatory pathways. Here, we detail what is known about how bacterial symbionts, from pathogens to mutualists, control host cellular differentiation across the central dogma, from epigenetic chromatin modifications, to transcription and mRNA processing, to translation and protein modifications. We identify four main trends from this survey. First, mechanisms for controlling host gene expression appear to evolve from symbionts co-opting cross-talk between host signaling pathways. Second, symbiont regulatory capacity is constrained by the processes that drive reductive genome evolution in host-associated bacteria. Third, the regulatory mechanisms symbionts exhibit correlate with the cost/benefit nature of the association. And, fourth, symbiont mechanisms for interacting with host genetic regulatory elements are not bound by native bacterial capabilities. Using this knowledge, we explore how the ubiquitous intracellular Wolbachia symbiont of arthropods and nematodes may modulate host cellular differentiation to manipulate host reproduction. Our survey of the literature on how infection alters gene expression in Wolbachia and its hosts revealed that, despite their intermediate-sized genomes, different strains appear capable of a wide diversity of regulatory manipulations. Given this and Wolbachia's diversity of phenotypes and eukaryotic-like proteins, we expect that many symbiont-induced host differentiation mechanisms will be discovered in this system.
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Affiliation(s)
- Shelbi L Russell
- Department of Molecular Cell and Developmental Biology, University of California, Santa Cruz, CA, USA.
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12
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Bolea E, Jiménez-Lamana J, Laborda F, Abad-Álvaro I, Bladé C, Arola L, Castillo JR. Detection and characterization of silver nanoparticles and dissolved species of silver in culture medium and cells by AsFlFFF-UV-Vis-ICPMS: application to nanotoxicity tests. Analyst 2014; 139:914-22. [PMID: 24162133 DOI: 10.1039/c3an01443f] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A methodology based on Asymmetric Flow Field-Flow Fractionation (AsFlFFF) coupled with UV-Vis absorption spectrometry and ICP mass spectrometry (ICPMS) has been developed and applied to the study of silver nanoparticles (AgNPs) and dissolved species of silver in culture media and cells used in cytotoxicity tests. The effect of a nano-silver based product (protein stabilized silver nanoparticles ca. 15 nm average diameter) on human hepatoma (HepG2) cell viability has been studied. UV-Vis absorption spectrometry provided information about the nature (organic vs. nanoparticle) of the eluted species, whereas the silver was monitored by ICPMS. A shift towards larger hydrodynamic diameters was observed in the AgNPs after a 24 hour incubation period in the culture medium, which suggests a "protein corona" effect. Silver(I) associated with proteins present in the culture medium has also been detected, as a consequence of the oxidation process experimented by the AgNPs. However, the Ag(I) released into the culture medium did not justify the toxicity levels observed. AgNPs associated with the cultured HepG2 cells were also identified by AsFlFFF, after applying a solubilisation process based on the use of tetramethylammonium hydroxide (TMAH) and Triton X-100. These results have been confirmed by transmission electronic microscopy (TEM) analysis of the fractions collected from the AsFlFFF. The effect of AgNPs on HepG2 cells has been compared to that caused by silver(I) as AgNO3 under the same conditions. The determination of the total content of silver in the cells confirms that a much larger mass of silver as AgNPs with respect to AgNO3 (16 to 1) is needed to observe a similar toxicity.
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Affiliation(s)
- E Bolea
- Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
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13
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Galbán J, Andreu Y, Almenara MJ, de Marcos S, Castillo JR. Direct determination of uric acid in serum by a fluorometric-enzymatic method based on uricase. Talanta 2012; 54:847-54. [PMID: 18968307 DOI: 10.1016/s0039-9140(01)00335-6] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2000] [Revised: 01/24/2001] [Accepted: 01/24/2001] [Indexed: 12/01/2022]
Abstract
The present paper describes a method for the fluorometric determination of uric acid in blood serum by its reaction with uricase (UOx). The procedure is based on the changes in fluorescence that take place during the enzymatic reaction of UOx with uric acid when the solution is excited at 287 nm and the emission is measured at 330 nm. A mathematical model which relates the analytical signal to the analyte concentration was developed and the model also served to obtain some of the thermodynamic constants of the system (the Michaelis constant and the turnover number). The optimum reaction conditions and its analytical characteristics were studied, linear response range (3x10(-5)-6x10(-4) M) and reproducibility (4%, n=7). The method was applied to the determination of uric acid in three blood serum samples. The results were compared with those obtained by a commercial clinical analyzer and no systematic errors were observed.
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Affiliation(s)
- J Galbán
- GEAS, Analytical Spect. and Sensors Group, Department of Analytical Chemistry, Science Faculty, University of Zaragoza, Zaragoza E-50009, Spain
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14
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Bolea E, Gorriz MP, Bouby M, Laborda F, Castillo JR, Geckeis H. Multielement characterization of metal-humic substances complexation by size exclusion chromatography, asymmetrical flow field-flow fractionation, ultrafiltration and inductively coupled plasma-mass spectrometry detection: a comparative approach. J Chromatogr A 2006; 1129:236-46. [PMID: 16859692 DOI: 10.1016/j.chroma.2006.06.097] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [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: 11/21/2005] [Revised: 06/26/2006] [Accepted: 06/30/2006] [Indexed: 11/21/2022]
Abstract
The use of three different separation techniques, ultrafiltration (UF), high performance size exclusion chromatography (HPSEC) and asymmetrical flow field-flow fractionation (AsFlFFF), for the characterization of a compost leachate is described. The possible interaction of about 30 elements with different size fractions of humic substances (HS) has been investigated coupling these separation techniques with UV-vis absorption spectrophotometry and inductively coupled plasma-mass spectrometry (ICP-MS) as detection techniques. The organic matter is constituted by a polydisperse mixture of humic substances ranging from low molecular weights (around 1kDa) to significantly larger entities. Elements can be classified into three main groups with regard to their interaction with HS. The first group is constituted by primarily the monovalent alkaline metal ions and anionic species like B, W, Mo, As existing as oxyanions all being not significantly associated to HS. The second group consists of elements that are at least partly associated to a smaller HS size fraction (such as Ni, Cu, Cr and Co). A third group of mainly tri- and tetravalent metal ions like Al, Fe, the lanthanides, Sn and Th are rather associated to larger-sized HS fractions. The three separation techniques provide a fairly consistent size classification for most of the metal ions, even though slight disagreements were observed. The number-average molecular weight (Mn), the weight-average molecular weight (Mw) and the polydispersity (rho) parameters have been calculated both from AsFlFFF and HPSEC experiments and compared for HS and some metal-HS species. Differences in values can be partly explained by an overloading effect observed in the AsFlFFF experiments induced by electrostatic repulsion effects in the low ionic strength, high pH carrier solution. Size information obtained from ultrafiltration is not as resolved as for the other methods. Molecular weight cut-offs (MWCO) of the individual filter membranes refer to globular proteins and molecular weight information may therefore, deviate from that given by the other methods after calibration with polystyrene sulfonate (PSS) standards.
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Affiliation(s)
- E Bolea
- Analytical Spectroscopy and Sensors Group, Department of Analytical Chemistry, University of Zaragoza, Pedro Cerbuna 12, Zaragoza, Spain.
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15
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Vidal JC, Garcia-Ruiz E, Espuelas J, Aramendia T, Castillo JR. Comparison of biosensors based on entrapment of cholesterol oxidase and cholesterol esterase in electropolymerized films of polypyrrole and diaminonaphthalene derivatives for amperometric determination of cholesterol. Anal Bioanal Chem 2003; 377:273-80. [PMID: 12923606 DOI: 10.1007/s00216-003-2120-x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [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: 03/07/2003] [Revised: 06/10/2003] [Accepted: 06/13/2003] [Indexed: 10/26/2022]
Abstract
Cholesterol amperometric biosensors constructed with enzymes entrapped in electropolymerized layers of polypyrrole and poly-naphthalene derivative polymers are compared. The biosensors are based on entrapment of cholesterol oxidase and/or cholesterol esterase in monolayer or multilayer films electrochemically synthesised from pyrrole, 1,8-diaminonaphthalene (1,8-DAN), and 1,5-diaminonaphthalene (1,5-DAN) monomers. Seven configurations were assayed and compared, and different analytical properties were obtained depending on the kind of polymer and the arrangement of the layers. The selectivity properties were evaluated for the different monolayer and bilayer configurations proposed as a function of the film permeation factor. All the steps involved in the preparation of the biosensors and determination of cholesterol were carried out in a flow system. Sensitivity and selectivity depend greatly on hydrophobicity, permeability, compactness, thickness, and the kind of the polymer used. In some cases a protective outer layer of non-conducting poly( o-phenylenediamine) polymer improves the analytical characteristics of the biosensor. A comparative study was made of the analytical performance of each of the configurations developed. The biosensors were also applied to the flow-injection determination of cholesterol in a synthetic serum.
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Affiliation(s)
- J C Vidal
- Analytical Chemistry Department, Faculty of Science, University of Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain.
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16
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Sadi BBM, Wrobel K, Wrobel K, Kannamkumarath SS, Castillo JR, Caruso JA. SEC-ICP-MS studies for elements binding to different molecular weight fractions of humic substances in compost extract obtained from urban solid waste. J Environ Monit 2002; 4:1010-6. [PMID: 12509059 DOI: 10.1039/b206985g] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, the speciation of elements in compost was studied with emphasis on their binding to humic substances. In order to assess the distribution of As, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, U, Th and Zn among molecular weight fractions of humic substances, the compost extract (extracted by 0.1 mol l(-1) sodium pyrophosphate) was analyzed by size exclusion chromatography coupled on-line with UV-Vis spectrophotometric and ICP-MS detection. Similar chromatograms were obtained for standard humic acid (Fluka) and for compost extract (254 nm, 400 nm) and three size fractions were operationally defined that corresponded to the apparent molecular weight ranges > 15 kDa, 1-15 kDa and < 1 kDa. The percentage of total element content in compost that was leached to the extract ranged from 30% up to 100% for different elements. The elution profiles of Co, Cr, Cu, Ni and Pb (ICP-MS) followed that of humic substances, while for other elements the bulk elution peak matched the retention time observed for the element in the absence of compost extract. Spiking experiments were carried out to confirm elements' binding and to estimate the affinity of individual elements for humic substances derived from compost. The results obtained indicated the following order of decreasing affinity: Cu > Ni > Co > Pb > Cd > (Cr, U, Th) >> (As, Mn, Mo, Zn). After standard addition, further binding of Cu, Ni and Co with the two molecular weight fractions of humic substances was observed, indicating that humic substances derived from compost were not saturated with these elements.
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Affiliation(s)
- Baki B M Sadi
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
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17
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Lopez-Molinero A, Mendoza O, Callizo A, Chamorro P, Castillo JR. Chemical vapor generation for sample introduction into inductively coupled plasma atomic emission spectroscopy: vaporization of antimony(III) with bromide. Analyst 2002; 127:1386-91. [PMID: 12430615 DOI: 10.1039/b206556h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [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: 11/21/2022]
Abstract
A new method for antimony determination in soils is proposed. It is based on the chemical vapor generation of Sb(III) with bromide, after a reaction in sulfuric acid media and transport of the gaseous phase into an inductively coupled plasma for atomic emission spectrometry. The experimental variables influencing the method were delimited by experimental design and the most important were finally optimized by the modified Simplex method. In optimized conditions the method involves the reaction of 579 microl concentrated sulfuric acid with 120 microl 5% w/v KBr and 250 microl antimony solution. Measurement of antimony emission intensity at 217.581 nm provides a method with an absolute detection limit of 3.5 ng and a precision (RSD) of 5.8% for the injection of five replicates of 175 ng Sb(III) (250 microl of 0.7 microg ml(-1) solution). The interference of common anions and cations on the antimony signal was evaluated. A 21% Sb(III) volatilization efficiency was calculated from the mean of six experiments at optimum conditions. The accuracy of the methodology was checked by the analysis of one standard reference soil after acid decomposition heating in a microwave oven.
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Affiliation(s)
- A Lopez-Molinero
- Department of Analytical Chemistry, Faculty of Science, University of Zaragoza, Spain.
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18
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Baranguan MT, Laborda F, Castillo JR. Reagent injection FIA system for lead determination by hydride generation - quartz-tube atomic absorption spectrometry. Anal Bioanal Chem 2002; 374:115-9. [PMID: 12207251 DOI: 10.1007/s00216-002-1465-x] [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: 02/07/2002] [Revised: 06/19/2002] [Accepted: 06/21/2002] [Indexed: 10/27/2022]
Abstract
A method is proposed for the determination of lead by generation of its hydride and detection by quartz-tube AAS using a reagent injection FIA system based on the injection of sodium tetrahydroborate. Lead hydride generation was carried out using a combination of 0.5 M nitric acid, 10% m/ v hydrogen peroxide and 10% m/ v sodium tetrahydroborate. The characteristic concentration obtained was 3.1 ng mL(-1) and the detection limit was 2.6 ng mL(-1) for an injected volume of 0.125 mL of tetrahydroborate.
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Affiliation(s)
- M T Baranguan
- Analytical Spectroscopy and Sensors Group, Department of Analytical Chemistry, University of Zaragoza, Spain
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19
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Galbán J, Andreu Y, Sierra JF, de Marcos S, Castillo JR. Intrinsic fluorescence of enzymes and fluorescence of chemically modified enzymes for analytical purposes: a review. LUMINESCENCE 2001; 16:199-210. [PMID: 11312548 DOI: 10.1002/bio.633] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [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: 11/09/2022]
Abstract
In recent years our research group has developed new alternatives for fluorescence enzymatic determinations. First, we observed that the intrinsic fluorescence of enzymes changes during enzymatic reactions, proportionally to the substrate concentration, avoiding the combination of the enzymatic reaction with a fluorophore-involving reaction. The main disadvantage of this method is that the excitation and emission wavelengths of the enzymes are in the UV region of the spectrum. An alternative to overcome this problem consisted of covalently bonding the enzyme to a fluorophore. In this paper, an overview is given of all of the applications and future developments on both types of alternatives that we have developed. Apart from the analytical characteristics of the methods, we have also reviewed all of the information about mathematical models we have elaborated to date.
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Affiliation(s)
- J Galbán
- Analytical Spectroscopy and Sensors Group (GEAS), Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, -E-50009 Zaragoza, Spain.
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Vidal JC, Garcia-Ruiz E, Castillo JR. Strategies for the improvement of an amperometric cholesterol biosensor based on electropolymerization in flow systems: use of charge-transfer mediators and platinization of the electrode. J Pharm Biomed Anal 2000; 24:51-63. [PMID: 11108539 DOI: 10.1016/s0731-7085(00)00395-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [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: 11/30/2022]
Abstract
Different configurations based on an amperometric biosensor with cholesterol oxidase entrapped in a polypyrrole film have been developed with a view to improving the analytical properties of this biosensor. The alternatives considered involve the simultaneous entrapment of the enzyme and a charge-transfer mediator as well as previous platinization of the surface of the Pt electrode. Both artificial (a ferrocene derivative) and natural (flavin nucleotides) mediators were studied as constituents of the charge-transfer process between the enzyme and the electrode. The comparative study of these biosensors, which were prepared in situ in a continuous flow system, made it possible to determine the advantages and disadvantages of each configuration when applied to flow-injection determination of cholesterol.
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Affiliation(s)
- J C Vidal
- Department of Analytical Chemistry, Analytical Spectroscopy and Sensors Group (GEAS), Faculty of Sciences, University of Zaragoza, Spain.
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21
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Andreu Y, Galbán J, de Marcos S, Castillo JR. Determination of direct-bilirubin by a fluorimetric-enzymatic method based on bilirubin oxidase. Fresenius J Anal Chem 2000; 368:516-21. [PMID: 11227536 DOI: 10.1007/s002160000503] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A method for the determination of direct bilirubin by reaction with bilirubin oxidase (BOx) is reported. The procedure is based on the changes in fluorescence which take place during the enzymatic reaction of BOx with any of the three forms of bilirubin (free, conjugated and with albumin) when the solution is excited at 240 nm and the emission is measured at 440 nm. The change in fluorescence was studied thoroughly. It seems mainly due to the fluorescence of one of the reaction products. A theoretical study was carried out to relate the changes in fluorescence observed to the species taking part in the reaction and to establish some of the enzymatic reaction constants. The optimum reaction conditions were studied for each of the three types of bilirubin together with their analytical characteristics (linear range and precision). Selective determination of direct bilirubin was carried out for various synthetic samples with good results. A linear response up to 7 mg L(-1) of direct bilirubin was obtained. Using optimum conditions, the precision for free and conjugated bilirubin was 3.4% (n = 5) and 3.0% (n = 5), respectively.
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Affiliation(s)
- Y Andreu
- GEAS, Department of Analytical Chemistry, Science Faculty, University of Zaragoza, Spain
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22
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Lopez-Molinero A, Castro A, Pino J, Perez-Arantegui J, Castillo JR. Classification of ancient Roman glazed ceramics using the neural network of Self-Organizing Maps. Fresenius J Anal Chem 2000; 367:586-9. [PMID: 11225836 DOI: 10.1007/s002160000433] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Artificial neural networks with unsupervised learning strategy known as Self-Organizing Maps were applied to classify ancient Roman glazed ceramics. Their clay ceramic bodies were analyzed by Inductively Coupled Plasma-Atomic Emission Spectroscopy and the chemical composition obtained was processed by this neural algorithm. The results obtained provide two types of information: firstly, classification of ceramic samples with identification of several groups and secondly, differentiation between the elemental chemical information. It was found that there are certain chemical elements which can be considered as principal and which can serve to differentiate between ceramics, whereas other elements give redundant information and do not contribute to sample differentiation. Seven chemical elements were considered principal and provide the necessary information. Two types of element were identified: 1- a group formed by common elements, such as: Ca, Fe, Mg, Mn and 2- another formed by optional elements: K or Na and Ba or Sr and Al or Ti.
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Affiliation(s)
- A Lopez-Molinero
- Department of Analytical Chemistry, University of Zaragoza, Spain
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23
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Castillo JR, Torelló J, Hernandez A. Liver injury caused by ebrotidine: a new example of the utility of the postmarketing surveillance. Eur J Clin Pharmacol 2000; 56:187-9. [PMID: 10877015 DOI: 10.1007/s002280050739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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de Abajo F, Alvarez Requejo A, Ayani I, Carrillo JA, Carvajal A, Castillo JR, Cuchi T, Esteban Calvo C, Figueras A, García del Pozo J, González S, González Ruiz M, Herrero FT, Hidalgo A, Giménez Guillén C, Khalid H, Martínez MA, Madurga M, Martins MM, Mallén MM, de Diego IM, Martín-Serrano G, Montero D, Navarro M, Pedrós C. [Safety of meningococcal A and C vaccine. Data from the Spanish drug surveillance system. Meningococcal Vaccine Research Group of the Spanish System of Drug Surveillance]. Gac Sanit 1999; 13:462-7. [PMID: 10620316 DOI: 10.1016/s0213-9111(99)71407-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Data on meningococcal vaccines safety are scanty. In 1997 several vaccination campaign took place in Spain. Thus, this situation was used to improve our knowledge about the safety profile of this vaccine. METHODS An inquiry was carried out to the Regional Centers of the Spanish Pharmacovigilance System to know the number of vaccinated people and the type and number of suspected cases of adverse reactions. RESULTS There were 133 identified cases of suspected adverse reactions associated with meningococcal A and C vaccine until June 1st, 1998. Most of them affected the skin (25,3%) or nervous system (similar proportion). Those of allergic reactions accounted for 35,2%. Two cases were considered as severe, although they were resolved without secuelae. CONCLUSIONS Serious risks were not detected. The Spanish Pharmacosurveillance System as an epidemiological surveillance resource has been useful to know the safety problems associated with antimeningococcal vaccine in the community.
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25
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Vidal JC, García E, Méndez S, Yarnoz P, Castillo JR. Three approaches to the development of selective bilayer amperometric biosensors for glucose by in situ electropolymerization. Analyst 1999; 124:319-24. [PMID: 10605893 DOI: 10.1039/a805533e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [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: 11/21/2022]
Abstract
Three different glucose oxidase biosensors for the enzymatic determination of glucose, based on bilayer polymer coatings consisting of polypyrrole (PPy) and poly(o-phenylenediamine), were developed. The electrode substrates are Pt metal, carbon paste and an organic conducting salt (tetrathiafulvalene-tetracyanoquinodimethane), which introduces appreciable variability in the electrode construction process. The three sensors were compared with one another and with bare and PPy monolayer-coated sensors in terms of performance in the determination of glucose in a synthetic serum sample. These configurations provide improved selectivity against the interferences of electroactive species such as ascorbic acid and uric acid, frequently present in biological samples, and the differences between them can be taken advantage of in application to different kinds of samples.
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Affiliation(s)
- J C Vidal
- Department of Analytical Chemistry, GEAS, Faculty of Sciences, University of Zaragoza, Spain
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26
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Castillo JR, Jiménez MC, Torelló J, Merino N. [Prescriptions of omeprazole in primary health care]. Gastroenterol Hepatol 1998; 21:371. [PMID: 9808905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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27
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Vidal JC, Garcia E, Castillo JR. Electropolymerization of pyrrole and immobilization of glucose oxidase in a flow system: influence of the operating conditions on analytical performance. Biosens Bioelectron 1998; 13:371-82. [PMID: 9642772 DOI: 10.1016/s0956-5663(97)00116-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The in situ potentiostatic electropolymerization of pyrrole (Py) on a Pt electrode in a thin-layer amperometric cell and the entrapment of the enzyme glucose oxidase (GOx) for the determination of glucose are reported. Polypyrrole (PPy) is directly formed by continuous passage of a buffered solution of the monomer (0.4 M) and enzyme (250 U mL-1) at pH 7 at a flow rate of 0.05-0.1 mL min-1 under a constant applied potential of +0.85 V vs Ag/AgCl decreases. The electrosynthesis of PPy by injection of 500 microL of a Py + GOx solution in a carrier electrolyte consisting of 0.05 M phosphate buffer and 0.1 M KCl at pH 7.0 was also assayed. The influence of the electropolymerization conditions on the analytical response of the sensor to glucose was investigated. The analytical performance of the PPy/GOx sensor was also studied in terms of durability and storage life, as well as selectivity against electroactive species such as ascorbic acid and uric acid as a function of the thickness of the polymer film formed.
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Affiliation(s)
- J C Vidal
- Department of Analytical Chemistry, GEAS, Faculty of Sciences, University of Zaragoza, Spain
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28
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de Marcos S, Galbán J, Alonsa C, Castillo JR. Intrinsic molecular fluorescence of lactate dehydrogenase: an analytical alternative for enzymic determination of pyruvate. Analyst 1997; 122:355-9. [PMID: 9177079 DOI: 10.1039/a606508b] [Citation(s) in RCA: 16] [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] [Indexed: 02/04/2023]
Abstract
A method for the enzymic determination of pyruvate based on changes in the fluorescence intensity of lactate dehydrogenase (LDH) is described. These changes are due to the differential quenching effect produced by NAD and NADH on the LDH fluorescence. The NADH quenching is due to both an inner filter effect and LDH-NADH complex formation; the LDH-NADH complex is also fluorescent. However, the NAD quenching is based only on the inner filter effect. From these suppositions, the equilibrium constant of the reaction and the formation constant of the LDH-NADH complex were obtained. Given this, an appropriate analytical signal for the quantification of pyruvate and a mathematical model explaining the effect of each parameter are proposed. The linear response range of the method depends on the NADH concentration used during the determination; it is possible to determine pyruvate concentrations down to 8.8 x 10(-7) mol dm-3. The method was applied to the determination of pyruvate in synthetic blood samples with good accuracy.
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Affiliation(s)
- S de Marcos
- Analytical Chemistry Department, Faculty of Sciences, University of Zaragoga, Spain
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29
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Cañas E, Pachon J, Garcia-Pesquera F, Castillo JR, Viciana P, Cisneros JM, Jimenez-Mejias ME. Absence of effect of trimethoprim-sulfamethoxazole on pharmacokinetics of zidovudine in patients infected with human immunodeficiency virus. Antimicrob Agents Chemother 1996; 40:230-3. [PMID: 8787912 PMCID: PMC163089 DOI: 10.1128/aac.40.1.230] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Pharmacokinetic parameters of zidovudine (ZDV) were not altered in 16 patients receiving concomitant therapy with ZDV and trimethoprim-sulfamethoxazole by oral administration. ZDV areas under the concentration-time curves were (means +/- standard deviations) 1.80 +/- 0.70 and 1.69 +/- 0.64 micrograms.h/ml in the absence and presence of trimethoprim-sulfamethoxazole, respectively. ZDV clearances were 1.57 +/- 0.61 and 1.74 +/- 0.66 liters/h/kg, respectively.
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Affiliation(s)
- E Cañas
- Infectious Diseases Unit, Hospital Universitario Virgen del Rocio, Seville, Spain
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30
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Foster JA, Klotz KL, Flickinger CJ, Thomas TS, Wright RM, Castillo JR, Herr JC. Human SP-10: acrosomal distribution, processing, and fate after the acrosome reaction. Biol Reprod 1994; 51:1222-31. [PMID: 7888499 DOI: 10.1095/biolreprod51.6.1222] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [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] [Indexed: 01/27/2023] Open
Abstract
SP-10 is a testis-specific acrosomal protein that has been detected in several species including humans. Extracts from whole human testis and epididymal, ejaculated, and capacitated sperm were analyzed by Western blot for SP-10 polypeptides. The testis extracts contained a full-length SP-10 protein at approximately 45 kDa as well as other immunoreactive SP-10 peptides at 32, 30, 28, and 26 kDa. Extracts from epididymal, ejaculated, and capacitated sperm contained several immunoreactive SP-10 peptides that co-migrated with the 32-26-kDa SP-10 peptides in the testis extracts. Epididymal, ejaculated, and capacitated sperm extracts did not contain the 45-kDa SP-10 peptide observed in testis extracts, but did contain immunoreactive SP-10 peptides from 25 to 18 kDa that were not detected in testis extracts. These results indicate that a full-length 45-kDa SP-10 precursor protein is present in the testis and that SP-10 peptides of 32, 30, 28, and 26 kDa result from proteolytic processing of the SP-10 precursor protein in the testis and/or alternative splicing. In addition, SP-10 peptides of 25-18 kDa were first detected in extracts of caput epididymal sperm and probably resulted from the proteolytic processing of the 45- and 32-26-kDa SP-10 peptides in the initial segment or caput epididymidis. Also, no additional SP-10 bands were detected in extracts of cauda epididymal, ejaculated, or capacitated sperm, suggesting that no further processing of the 32-18-kDa SP-10 peptides occurred during epididymal transit, ejaculation, and capacitation. Electron microscopic immunocytochemical observations of epididymal, ejaculated, and capacitated sperm revealed that colloidal gold labeling of SP-10 was most abundant within the principal segment and posterior bulb of the equatorial segment of the acrosome, while the colloidal gold labeling of SP-10 was sparse in the anterior equatorial segment of the acrosome. After a follicular fluid-induced acrosome reaction, SP-10 was detected on the inner acrosomal membrane in the equatorial segment and was associated with hybrid vesicles. This localization after the acrosome reaction is consistent with the hypothesis that SP-10 may be involved in sperm-zona binding or penetration.
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Affiliation(s)
- J A Foster
- Department of Cell Biology, University of Virginia, Charlottesville 22908
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31
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Reddi PP, Castillo JR, Klotz K, Flickinger CJ, Herr JC. Production in Escherichia coli, purification and immunogenicity of acrosomal protein SP-10, a candidate contraceptive vaccine. Gene 1994; 147:189-95. [PMID: 7926798 DOI: 10.1016/0378-1119(94)90064-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [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] [Indexed: 01/27/2023]
Abstract
The testis-specific human sperm antigen, SP-10, has been designated a 'primary vaccine candidate' by the World Health Organization Taskforce on Contraceptive Vaccines. Molecular cloning and sequencing of the cDNAs coding for human (h) and baboon (b) SP-10 have been reported. To produce large amounts of pure antigen for ongoing studies of the immunogenicity and anti-fertility effects of SP-10, we used an efficient Escherichia coli expression system. The full-length open reading frames for hSP-10 and bSP-10 were placed under the inducible T7 bacteriophage RNA polymerase/promoter system. An in-frame fusion was made such that a His6 stretch was produced at the C terminus of SP-10. Upon induction of gene expression, large amounts of hSP-10 or bSP-10 were synthesized and the recombinant (re-) protein segregated into an insoluble fraction. The protein was then solubilized in 6 M guanidine.HCl and purified by immobilized metal affinity chromatography (IMAC). The yield of purified bSP-10 preparation was approx. 20 micrograms/ml of culture. Immunoreactivity of the purified re-SP-10 with MHS-10, a monoclonal antibody specific to SP-10, and rabbit polyclonal sera raised against SP-10, indicated that the synthesized antigen was suitable for immunization studies. Four female baboons were then immunized with the re-bSP-10 antigen. Immunoblots using pre-immune and immune sera from these animals indicated that all four baboons produced antibodies that reacted with native SP-10 extracted from human sperm in a manner identical to that of MHS-10, the positive control. Immune sera also stained the acrosome region of human and baboon sperm heads by immunofluorescence.(ABSTRACT TRUNCATED AT 250 WORDS)
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MESH Headings
- Acrosome
- Animals
- Antigens/genetics
- Antigens/immunology
- Antigens/isolation & purification
- Base Sequence
- Blotting, Western
- Chromatography, Affinity
- Cloning, Molecular
- Contraception, Immunologic
- DNA, Complementary
- Electrophoresis, Polyacrylamide Gel
- Escherichia coli
- Female
- Gonadal Steroid Hormones/genetics
- Gonadal Steroid Hormones/immunology
- Gonadal Steroid Hormones/isolation & purification
- Humans
- Membrane Proteins
- Microscopy, Fluorescence
- Molecular Sequence Data
- Papio
- Vaccines, Synthetic/genetics
- Vaccines, Synthetic/immunology
- Vaccines, Synthetic/isolation & purification
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Affiliation(s)
- P P Reddi
- Dept. of Anatomy and Cell Biology, University of Virginia, Charlottesville 22908
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32
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Peraza SD, Carrillo E, López G, Castro D, Andrade O, Cano E, Oliver W, Castillo JR, Petrilli A, Romero Ferrero F. [Gastric leiomyoblastoma. Histomorphologic and immunologic analysis of 3 cases]. G E N 1994; 48:92-7. [PMID: 7774791] [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: 01/27/2023]
Abstract
We present three cases of Leiomioblastomas of stomach, diagnosed at the unit of Pathology of the Gastrointestinal Cancer Center "Dr Luis E. Anderson" -San Cristóbal-Táchira State Venezuela. The lesions are analyzed from the clinical, morphological and immunohistological points of view, utilizing Queratine and Vimentin techniques. This neoplasm is not frequent but it is interesting because its biologic behavior not always correspond to its histology-pattern.
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Affiliation(s)
- S D Peraza
- Centro de Control de Cáncer Gastrointestinal Dr. Luis E. Anderson San Cristóbal, Estado Tachira, Venezuela
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Abstract
This paper presents a procedure for fluorometric-enzymatic lactate determination based on the modification of the fluorometric properties of the enzyme L-lactic dehydrogenase (cytochrome b2). during the enzymatic oxidation of the analyte with ferricyanide. During the reaction one can observe an irreversible fall in the intensity of the enzyme's fluorescence, the rate of which is proportional to the concentration of the lactate. The source of this signal has been investigated and it has been shown that, besides the formation of a complex between the enzyme and the ferricyanide (the constant of which can be determined), this signal loss can be explained by simultaneous inner filter effects caused by the ferricyanide and the ferrocyanide (generated in the enzymatic reaction). A mathematical model has been developed which makes it possible to establish a linear response between the enzyme's analytical signal of fluorescence and the concentrations of the lactate, the cytochrome, and the ferricyanide. The procedure makes it possible to determine the lactate in concentrations ranging from 0.2 to 45 mg/L. Determination of the analyte has been carried out in milk samples with great precision and accuracy.
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Affiliation(s)
- J Galbán
- Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, Spain
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Pachón J, Viciana P, Cisneros JM, García Pesquera F, Castillo JR, Cañas E. [Pharmacokinetic study of zidovudine in parenteral drug addicts with human immunodeficiency virus infection]. Med Clin (Barc) 1993; 100:46-9. [PMID: 8429708] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND The aim of this study was to know the pharmacokinetics of zidovudine (ZDV) in steady state in patients with infection by the human immunodeficiency virus (HIV) in whom the risk factor was intravenous drug use. METHODS The study was carried out in 8 patients in stage IV of the Centers for Disease Control (CDC) with no acute intercurrent process, with normal liver and renal function, orally receiving 250 mg of ZDV every 6 hours. Blood samples were taken between 30 and 360 minutes from the last doses taken during fasting. Plasma concentrations of ZDV and glucuronide zidovudine (G-ZDV) were determined by radioimmunoassay with the data being adapted to a monocompartmental pharmacokinetic model. RESULTS The maximum concentration (Cmax) of ZDV was 0.81 +/- 0.38 microgram/ml demonstrating high interindividual variability with values between 0.35 microgram/ml and 1.45 microgram/ml. The mean Cmax of G-ZDV was 1.44 +/- 0.64 microgram/ml. The mean t1/2 of ZDV and G-ZDV was 1.63 +/- 0.75 hours and 1.12 +/- 0.32 hours, respectively, with values oscillating between 0.99 and 3.14 h in the case of ZDV. The area below the curve concentration/time (AUC) of ZDV was 1.43 +/- 0.34 microgram-h/ml and in the case of G-ZDV the AUC was 2.73 +/- 0.91 microgram-h/ml. Total body clearance (Clb) of ZDV was 2.11 +/- 0.64 l/kg/h and the volume of distribution (Vd) of ZDV was 5.6 +/- 1.73 l/kg. CONCLUSIONS The results of this study demonstrate that there is a marked interindividual variability in the pharmacokinetics of zidovudine suggesting the need for adapting dosage to patients weight and monitoring plasma concentration.
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Affiliation(s)
- J Pachón
- Unidad de Enfermedades Infecciosas, Hospital Universitario Virgen del Rocío, Sevilla
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Abstract
OBJECTIVE To study the pharmacokinetics of zidovudine (ZDV) and its glucoronide metabolite (G-ZDV) in a patient with end-stage renal disease in haemodialysis. DESIGN Pharmacokinetics study performed during and between haemodialysis sessions. METHODS The patient was treated with oral ZDV (100 mg every 8 h). Concentrations of ZDV and G-ZDV were measured by radioimmunoassay. A monocompartmental model was used to calculate pharmacokinetic parameters. RESULTS The peak plasma concentrations of ZDV and G-ZDV after drug administration between haemodialysis sessions were 0.57 and 10.01 micrograms/ml, respectively. The half-lives of ZDV and G-ZDV rose to 3.2 and 14.2 h, respectively. The total body clearance for ZDV in the period between haemodialysis sessions (0.44 l/kg/h) was 66% lower than normal values. The ZDV half-life was normalized by haemodialysis, the total body clearance of ZDV increased (1.12 l/kg/h) and the G-ZDV half-life shortened (5.9-7.9 h). Neither G-ZDV accumulation nor derived ZDV toxicity occurred. CONCLUSIONS Our data suggest that ZDV is safe and an efficient drug when administered at a dosage of 100 mg three times daily in patients with end-stage renal disease in haemodialysis sessions, and that ZDV and G-ZDV are cleared by haemodialysis.
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Affiliation(s)
- J Pachon
- Infectious Diseases Unit, Hospital Universitario Virgen del Rocio, Sevilla, Spain
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36
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Serrano JS, Hevia A, Fernández-Alonso A, Castillo JR. Effect of PK 11195, an antagonist of benzodiazepine receptors, on platelet aggregation in a model of anxiety in the rat. Gen Pharmacol 1988; 19:573-7. [PMID: 2842219 DOI: 10.1016/0306-3623(88)90166-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
1. Anxiety induced by forced swimming increases maximal intensity (h) of platelet aggregation (PAG) and time to reach it (t). 2. PK 11195 pretreatment (12.5 and 25 mg/kg) reverses anxiety-induced PAG changes. At 6.25 mg/kg it inhibits PAG. 3. Changes induced by anxiety on PAG may be mediated by peripheral-benzodiazepine receptors.
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Affiliation(s)
- J S Serrano
- Departamento de Farmacologia y Terapéutica, Facultad de Medicina, Sevilla, Spain
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