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Pathogenic Microbiology Commons

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Full-Text Articles in Pathogenic Microbiology

Molecular Characterization Of Zebrafish Interferon, Mx, And Mx Promoter, Stephen Altmann Dec 2003

Molecular Characterization Of Zebrafish Interferon, Mx, And Mx Promoter, Stephen Altmann

Electronic Theses and Dissertations

Type I interferons (IFNs) represent a family of biological molecules whose antiviral, antitumor, and immunomodulatory role is well known. IFNs were first identified in the 1950's and have since been used extensively for the treatment of various cancers, and viral infections. In order to more fully characterize the IFN response, it is often necessary to use animal models. Although the mouse has been used extensively for IFN studies, a lower order vertebrate model is also desirable, as it would provide information about the structure and function of a more ancestral IFN. To this end, herein is described the cloning ...


Single-Cell Enumeration Of An Uncultivated Tm7 Subgroup In The, Cleber C. Ouverney, Gary C. Armitage, David A. Relman Oct 2003

Single-Cell Enumeration Of An Uncultivated Tm7 Subgroup In The, Cleber C. Ouverney, Gary C. Armitage, David A. Relman

Faculty Publications

Specific oligonucleotide hybridization conditions were established for single-cell enumeration of uncultivated TM7 and IO25 bacteria by using clones expressing heterologous 16S rRNA. In situ analysis of human subgingival crevice specimens revealed that a greater proportion of samples from sites of chronic periodontitis than from healthy sites contained TM7 subgroup IO25. In addition, IO25 bacterial cells from periodontitis site samples were more abundant and fourfold longer than IO25 cells from healthy site samples.


Cultivation Of Tropheryma Whipplei From Cerebrospinal Fluid, Matthias Maiwald, Axel Von Herbay, David N. Fredricks, Cleber C. Ouverney, Jon C. Kosek, David A. Relman Sep 2003

Cultivation Of Tropheryma Whipplei From Cerebrospinal Fluid, Matthias Maiwald, Axel Von Herbay, David N. Fredricks, Cleber C. Ouverney, Jon C. Kosek, David A. Relman

Faculty Publications

Whipple disease (WD) is a systemic disorder caused by the bacterium Tropheryma whipplei. Since the recognition of a bacterial etiology in 1961, many attempts have been made to cultivate this bacterium in vitro. It was eventually isolated, in 2000, from an infected heart valve, in coculture with human fibroblasts. Here we report the isolation of 2 new strains of T. whipplei from cerebrospinal fluid (CSF) of 2 patients with intestinal WD but no neurological signs or symptoms. One culture-positive specimen was obtained before treatment; the other was obtained 12 months after discontinuation of therapy, at a time of intestinal remission ...


Spirochete-Platelet Attachment And Thrombocytopenia In Murine Relapsing Fever Borreliosis, Kishore R. Alugupalli, Alan D. Michelson, Isabelle Joris, Tom G. Schwan, Kairbaan Hodivala-Dilke, Richard O. Hynes, John M. Leong Jul 2003

Spirochete-Platelet Attachment And Thrombocytopenia In Murine Relapsing Fever Borreliosis, Kishore R. Alugupalli, Alan D. Michelson, Isabelle Joris, Tom G. Schwan, Kairbaan Hodivala-Dilke, Richard O. Hynes, John M. Leong

Open Access Articles

Thrombocytopenia is common in persons infected with relapsing fever Borreliae. We previously showed that the relapsing fever spirochete Borrelia hermsii binds to and activates human platelets in vitro and that, after platelet activation, high-level spirochete-platelet attachment is mediated by integrin alpha IIb beta 3, a receptor that requires platelet activation for full function. Here we established that B hermsii infection of the mouse results in severe thrombocytopenia and a functional defect in hemostasis caused by accelerated platelet loss. Disseminated intravascular coagulation, immune thrombocytopenic purpura, or splenic sequestration did not play a discernible role in this model. Instead, spirochete-platelet complexes were ...


Prevalence Of Bacteria Of Division Tm7 In Human Subgingival Plaque And Their Association With Disease, Mary M. Brinig, Paul W. Lepp, Cleber C. Ouverney, Gary C. Armitage, David A. Relman Mar 2003

Prevalence Of Bacteria Of Division Tm7 In Human Subgingival Plaque And Their Association With Disease, Mary M. Brinig, Paul W. Lepp, Cleber C. Ouverney, Gary C. Armitage, David A. Relman

Faculty Publications

Members of the uncultivated bacterial division TM7 have been detected in the human mouth, but little information is available regarding their prevalence and diversity at this site. Human subgingival plaque samples from healthy sites and sites exhibiting various stages of periodontal disease were analyzed for the presence of TM7 bacteria. TM7 ribosomal DNA (rDNA) was found in 96% of the samples, and it accounted for approximately 0.3%, on average, of all bacterial rDNA in the samples as determined by real-time quantitative PCR. Two new phylotypes of this division were identified, and members of the division were found to exhibit ...


Transcriptional Control Of The Opp Operon In Clostridium Difficile, S. Lindsey Davis Jan 2003

Transcriptional Control Of The Opp Operon In Clostridium Difficile, S. Lindsey Davis

Inquiry: The University of Arkansas Undergraduate Research Journal

As a serious expense for both the hospital and the patient, nosocomial infections create a burden on the health care industry that is not easily overcome. Among the infections commonly contracted in the hospital environment, those associated with the Clostridium difficile bacterium account for millions of cases each year. Largely due to the nature of C. difficile infection as a response to the disruption of the normal flora of the colon caused by antibiotic activity, no completely effective treatment for this condition has been identified. It is this problem that forms the foundation for research devoted to the development of ...