Nancy Bigley (Advisor), Barbara Hull (Committee Member), Dawn Wooley (Committee Member)
Master of Science (MS)
Innate immune system plays an important role in individual's protection against pathogens and in activation of adaptive immune system. Utilizing RAW 264.7 murine macrophages as an innate immune response representative in this study, we analyzed the effect of invasive pathogen's components (e.g. flagellin) on the arrangement of macrophage's cytoskeleton, on viability of immune cells and on secretion of pro-inflammatory and anti-inflammatory cytokines and on fluorescence intensity of cytoskeleton after rearrangement. Additionally, we studied the similarity and differences between bacterial (Salmonella typhimurium) and synthetic TLR4 agonist (synthetic lipid-A) on viability, fluorescence intensity, cytokine secretion, and cytoskeleton rearrangements. Similarly, we studied the differences between TLR2 receptor agonist from gram-negative and the TLR2/6 receptor agonist from gram-positive bacteria. Flagellin at highest concentration (10 [micro]g/ml) decreased the macrophages viability significantly and increased the tubulin fluorescence intensity significantly. S. typhimurium's LPS and highest concentration of synthetic lipid A (10 [micro]g/ml) decreased the cell viability dramatically. However, the intensity of microtubules was dramatically lower in the S. typhimurium's LPS compared to synthetic lipid A at 5 and 10 [micro]g/ml concentrations. Both bacterial and synthetic TLR4 agonists elevate fluorescence intensity of microfilaments significantly. TLR2/6 agonists from grampositive bacteria decrease the cell viability more than TLR2 agonist from gram negative but not significantly; however, the fluorescence intensity of microtubules was significantly increased in TLR2 agonist in compared to TLR2/6 agonists at all concentrations. S. typhimurium at a concentration (106 cell/ml) that activates TLR4 induced production of IL-6, IL-10, and TNF-[alpha] significantly. Additionally, di-acylated lipoprotein at 5[micro]l induced very high levels of IL-10 secretion compared to control.
Department or Program
Microbiology and Immunology
Year Degree Awarded
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