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Articles 1 - 9 of 9

Full-Text Articles in Cell Biology

Virulence Of An Emerging Respiratory Pathogen, Genus Pandoraea, In Vivo And Its Interactions With Lung Epithelial Cells, Gillian Herbert, Anne Costello, Lydia Fabunmi, Kirsten Schaffer, Kevin Kavanagh, Emma M. Caraher, Máire Callaghan, Siobhan Mcclean Nov 2010

Virulence Of An Emerging Respiratory Pathogen, Genus Pandoraea, In Vivo And Its Interactions With Lung Epithelial Cells, Gillian Herbert, Anne Costello, Lydia Fabunmi, Kirsten Schaffer, Kevin Kavanagh, Emma M. Caraher, Máire Callaghan, Siobhan Mcclean

Articles

Pandoraea species have emerged as opportunistic pathogens among cystic fibrosis (CF) and non-CF patients. Pandoraea pulmonicola is the predominant Pandoraea species among Irish CF patients. The objective of this study was to investigate the pathogenicity and potential mechanisms of virulence of Irish P. pulmonicola isolates and strains from other Pandoraea species. Three patients from whom the P. pulmonicola isolates were isolated have since died. The in vivo virulence of these and other Pandoraea strains was examined by determining the ability to kill Galleria mellonella larvae. The P. pulmonicola strains generally were the most virulent of the species tested, with three ...


Distinct Macrophage Subpopulations Regulate Viral Encephalitis But Not Viral Clearance In The Cns, Christina D. Steel, Woong-Ki Kim, Larry Sanford, Laurie Wellman, Sandra Burnett, Nico Van Rooijen, Rochard P. Ciavarra Sep 2010

Distinct Macrophage Subpopulations Regulate Viral Encephalitis But Not Viral Clearance In The Cns, Christina D. Steel, Woong-Ki Kim, Larry Sanford, Laurie Wellman, Sandra Burnett, Nico Van Rooijen, Rochard P. Ciavarra

Biological Sciences Faculty Publications

Intranasal application of vesicular stomatitis virus (VSV) induces acute encephalitis characterized by a pronounced myeloid and T cell infiltrate. The role of distinct phagocytic populations on VSV encephalitis was therefore examined in this study. Ablation of peripheral macrophages did not impair VSV encephalitis or viral clearance from the brain, whereas, depletion of splenic marginal dendritic cells impaired this response and enhanced morbidity/mortality. Selective depletion of brain perivascular macrophages also suppressed this response without altering viral clearance. Thus, two anatomically distinct phagocytic populations regulate VSV encephalitis in a non-redundant fashion although neither population is essential for viral clearance in the ...


Regulation Of Morphogenesis In Filamentous Fungi, Haoyu Si May 2010

Regulation Of Morphogenesis In Filamentous Fungi, Haoyu Si

Dissertations and Theses in Biological Sciences

One of the distinguishing features of fungal cells is their highly polarized model of growth. Both yeast cells and hyphal cells grow by cell surface expansion at specified cortical sites. Although the same general mechanisms are likely to be involved in controlling the establishment of hyphal polarity in budding yeast and filamentous fungi, it is noticeable that hyphal cells are organized in a fundamentally different manner to yeast dells. For example, hyphal cells organize formins, septins and actins at the division site while simultaneously retain the same machinery at the tip; whereas yeast cells undergo a transient period of isotropic ...


Macroh2a1 Regulation During The Cell Cycle Of Mouse Embryonic Stem Cells, Persis S. Thomas May 2010

Macroh2a1 Regulation During The Cell Cycle Of Mouse Embryonic Stem Cells, Persis S. Thomas

Honors Scholar Theses

MacroH2A is a core histone variant that plays an important role in the X-inactivation process during differentiation of embryonic stem cells. It has been shown that macroH2A changes in localization during the cell cycle of somatic cells. This study aims to determine how macroH2A changes during the cell cycle of embryonic stem cells. Male and female mouse embryonic stem cells were transfected with a GFP::macroH2A construct and the relationship between macroH2A and the cell cycle was determined using FACS. This study shows that macroH2A is altered during the cell cycle of embryonic stem cells as it is in somatic ...


Analysis Of Apoptosis Of Memory T Cells And Dendritic Cells During The Early Stages Of Viral Infection Or Exposure To Toll-Like Receptor Agonists, Kapil Bahl, Anette Hubner, Roger J. Davis, Raymond M. Welsh May 2010

Analysis Of Apoptosis Of Memory T Cells And Dendritic Cells During The Early Stages Of Viral Infection Or Exposure To Toll-Like Receptor Agonists, Kapil Bahl, Anette Hubner, Roger J. Davis, Raymond M. Welsh

Davis Lab Publications

Profound type I interferon (IFN-I)-dependent attrition of memory CD8 and CD4 T cells occurs early during many infections. It is dramatic at 2 to 4 days following lymphocytic choriomeningitis virus (LCMV) infection of mice and can be elicited by the IFN-inducing Toll receptor agonist poly(I:C). We show that this attrition occurs in many organs, indicating that it is due to T cell loss rather than redistribution. This loss correlated with elevated intracellular staining of T cells ex vivo for activated caspases but with only low levels of ex vivo staining with annexin V, probably due to the ...


Cellular Immunity In Mouse Models Of Viral Encephalitis, Christina Dawn Steel Apr 2010

Cellular Immunity In Mouse Models Of Viral Encephalitis, Christina Dawn Steel

Theses and Dissertations in Biomedical Sciences

Evidence is presented herein that intranasal application of vesicular stomatitis virus (VSV) caused acute infection of the murine central nervous system (CNS) with associated morbidity and significant mortality in mice. However, VSV encephalitis was not invariably fatal, suggesting that the CNS contained a professional antigen-presenting cell (APC) capable of inducing or propagating a protective antiviral immune response. To examine this possibility, we administered VSV via the intranasal route and then characterized the cellular elements that infiltrate the brain as well as the activation status of resident microglia, cells widely believed to represent the major APC population in the CNS. To ...


The Saccharomyces Sun Gene, Uth1, Is Involved In Cell Wall Biogenesis, Father Nicanor Austriaco Feb 2010

The Saccharomyces Sun Gene, Uth1, Is Involved In Cell Wall Biogenesis, Father Nicanor Austriaco

Rev. Nicanor Austriaco, O.P.

Deletion of the Saccharomyces gene, UTH1, a founding member of the SUN family of fungal genes, has pleiotropic effects. Several phenotypes of Δuth1 cells including their decreased levels of mitochondrial proteins, their impaired autophagic degradation of mitochondria, and their increased viability in the presence of mammalian BAX, a proapoptotic regulator localized to the mitochondria, have prompted others to propose that the Uth1p functions primarily at the mitochondria. In this report, we show that cells lacking UTH1 have more robust cell walls with higher levels of β-d-glucan that allows them to grow in the presence of calcofluor white or sodium dodecyl ...


Real-Time Pcr Method For The Quantification Of Burkholderia Cepacia Complex Attached To Lung Epithelial Cells And Inhibitionn Of That Attachment, Ciara Wight, Gillian Herbert, Ruth Pilkington, Máire Callaghan, Siobhan Mcclean Jan 2010

Real-Time Pcr Method For The Quantification Of Burkholderia Cepacia Complex Attached To Lung Epithelial Cells And Inhibitionn Of That Attachment, Ciara Wight, Gillian Herbert, Ruth Pilkington, Máire Callaghan, Siobhan Mcclean

Articles

To develop a rapid method to quantify the attachment of the cystic fibrosis pathogen, Burkholderia multivorans, to lung epithelial cells (16HBE14o(-)) using real-time PCR with a view to monitoring potential inhibition of lung cell attachment. Mammalian and bacterial DNA were purified from bacteria attached to lung epithelial cells. The relative amount of bacteria attached was determined by amplification of the recA gene relative to the human GAPDH gene, in the presence of SYBR Green. The method was thoroughly validated and shown to correlate well with traditional plating techniques. Inhibition of bacterial attachment with simple sugars was then evaluated by real-time ...


Pattern Recognition In Cytopathology For Papanicolaou Screening, Jonathan Blackledge, Dmitriy Dubovitskiy Jan 2010

Pattern Recognition In Cytopathology For Papanicolaou Screening, Jonathan Blackledge, Dmitriy Dubovitskiy

Conference papers

A unique space oriented filer is presented in order to detect and isolate the cell of a nucleus for applications in cytopathology. A classification method for nuclei is then considered based on the application of a set of features which includes certain fractal parameters. Segmentation algorithms are considered in which a self-adjustable sharpening filter is designed to enhance object location. Although the methods discussed and the algorithms developed have a range of applications, in this work we focus the engineering of a system for automating a Papanicolaou screening test using standard optical images