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Full-Text Articles in Microbiology

Determining The Role Of Saly In Streptococcus Pyogenes Immune Evasion Using Fluorescence Microscopy, Taaniel Kiidli May 2018

Determining The Role Of Saly In Streptococcus Pyogenes Immune Evasion Using Fluorescence Microscopy, Taaniel Kiidli

Honors College

Streptococcus pyogenes, the etiologic agent for several life-threatening invasive diseases, utilizes numerous mechanisms to evade the host immune response and establish a successful infection causing a significant source of morbidity and mortality risks for patients. The bacterium is known to cause necrotizing fasciitis in both humans and zebrafish, with extensive necrotic damage to tissues but surprisingly lacking in an inflammatory response for a systemic infection. This suggests that the recruitment of inflammatory cells to the site of infection is inhibited. To observe this in real-time, we used the zebrafish model of Streptococcal pathogenesis to analyze immune cell recruitment in …


Characterization Of A Putative Hemolysin Expressed By Sneathia Amnii, A Preterm Birth-Associated Pathogen, Lizette Carrasco, Kimberly Jefferson Jan 2017

Characterization Of A Putative Hemolysin Expressed By Sneathia Amnii, A Preterm Birth-Associated Pathogen, Lizette Carrasco, Kimberly Jefferson

Undergraduate Research Posters

The gram-negative bacteria Sneathia amnii is a poorly-characterized commensal of the female urogenital tract frequently associated with adverse clinical outcomes such as bacterial vaginosis (BV), amnionitis, and preterm labor. To investigate its potential role in virulence, we sought to identify and characterize virulence determinants produced by S. amnii in an effort to better understand the pathogenesis of infectious preterm birth. Through sequencing of the Sn35 genome (type strain of S. amnii), we identified two genes with amino acid sequence similarity and structural similarity to the filamentous hemagglutinin (FHA) protein of Bordetella pertussis and its Type Vb transporter. Because S. amnii …


A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars Jun 2013

A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars

Yulia Dementieva

The effects of the polyunsaturated omega-3 (n-3) and omega-6 (n-6) fatty acids (FA) on hematopoiesis are complex in that both FA forms are processed into leukotrienes, eicosanoids, and prostaglandins, which can have independent effects. These FA have antagonistic effects in that n-6 FA prostaglandins tend to be pro-proliferative and pro-inflammatory, while the effects of n-3 FA prostaglandins are the opposite. We have previously shown that diets high in n-3 FA reduce the size of the middle to later stage myeloid progenitor compartment in FVB X sv129 F1hybrid mice. To assay the effects of high n-3 FA diets on earlier stages …


A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars Aug 2012

A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars

Elaine Hardman Ph.D.

The effects of the polyunsaturated omega-3 (n-3) and omega-6 (n-6) fatty acids (FA) on hematopoiesis are complex in that both FA forms are processed into leukotrienes, eicosanoids, and prostaglandins, which can have independent effects. These FA have antagonistic effects in that n-6 FA prostaglandins tend to be pro-proliferative and pro-inflammatory, while the effects of n-3 FA prostaglandins are the opposite. We have previously shown that diets high in n-3 FA reduce the size of the middle to later stage myeloid progenitor compartment in FVB X sv129 F1hybrid mice. To assay the effects of high n-3 FA diets on earlier stages …


A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars Aug 2012

A High Omega-3 Fatty Acid Diet Has Different Effects On Early And Late Stage Myeloid Progenitors, Melinda Varney, James Buchanan, Yulia Dementieva, W. Hardman, Vincent Sollars

Vincent E Sollars

The effects of the polyunsaturated omega-3 (n-3) and omega-6 (n-6) fatty acids (FA) on hematopoiesis are complex in that both FA forms are processed into leukotrienes, eicosanoids, and prostaglandins, which can have independent effects. These FA have antagonistic effects in that n-6 FA prostaglandins tend to be pro-proliferative and pro-inflammatory, while the effects of n-3 FA prostaglandins are the opposite. We have previously shown that diets high in n-3 FA reduce the size of the middle to later stage myeloid progenitor compartment in FVB X sv129 F1hybrid mice. To assay the effects of high n-3 FA diets on earlier stages …