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Immunology and Infectious Disease Commons™
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Biochemistry, Biophysics, and Structural Biology
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Articles 1 - 10 of 10
Full-Text Articles in Immunology and Infectious Disease
Mechanisms Of Natural Killer Cell Anti-Tumor Function And Homeostasis, Julia Alexandra Wagner
Mechanisms Of Natural Killer Cell Anti-Tumor Function And Homeostasis, Julia Alexandra Wagner
Arts & Sciences Electronic Theses and Dissertations
Natural killer (NK) cells are innate lymphoid cells (ILCs) that mediate anti-tumor and anti-viral immune responses. They do so via two primary effector functions: cytokine production and direct cytotoxicity. Unlike adaptive T and B lymphocytes, NK cells do not rearrange their DNA to express a predominant antigen-specific receptor, and instead express a variety of stochastically-expressed, germline DNA-encoded activating and inhibitory receptors whose signals integrate to govern their functional responses. What results is a diverse repertoire of NK cells capable of recognizing a variety of malignantly-transformed or virally-infected cells. Studies from several groups have established the anti-tumor potential of NK cells, …
Etv2/Myct1 Axis In The Regulation Of Tumor Angiogenesis And Anti-Tumor Immunity, Ashraf Ul Kabir
Etv2/Myct1 Axis In The Regulation Of Tumor Angiogenesis And Anti-Tumor Immunity, Ashraf Ul Kabir
Arts & Sciences Electronic Theses and Dissertations
Angiogenesis is a critical determinant of neoplastic growth and metastatic spread. As such, anti-angiogenic approaches have long been tried to throttle down tumor progression. However, current anti-angiogenic treatments so far have produced modest clinical benefits. Further in-depth research has provided rationales behind these disappointing and apparent perplexing clinical outcomes. It is now established that VEGF (vascular endothelial growth factor) and other prominent current angiogenic targets are neither specific to the vascular system nor the pathological conditions explaining the sub-optimal angiogenic control following the existing treatments. This suggests that anti-angiogenesis could still be a viable strategy for cancer patients should there …
Homeostatic T Cell Receptor Interactions With Self-Peptide Tune Cd4+ T Cell Function, Juliet Marie Bartleson
Homeostatic T Cell Receptor Interactions With Self-Peptide Tune Cd4+ T Cell Function, Juliet Marie Bartleson
Arts & Sciences Electronic Theses and Dissertations
Homeostatic T Cell Receptor Interactions with Self-Peptide Tune CD4+ T Cell Function
by
Juliet Marie Bartleson
Doctor of Philosophy in Biology and Biomedical Sciences
Immunology
Washington University in St. Louis, 2021
Professor Paul M. Allen, Chair
Mature CD4+ T cells circulate throughout peripheral secondary lymphoid organs using their T cell receptor (TCR) to surveil peptide presented on major histocompatibility complex class II molecules (pMHC) in search of cognate, antigenic peptide. In the absence of an immune challenge, however, the TCR is continuously interacting with self-pMHC, which induces a relatively weak TCR signal known as tonic signaling. These homeostatic TCR:self-pMHC interactions …
Protein Synthesis Adaptation To The Au-Rich Transcriptome Of Plasmodium Falciparum, Jessey Lee Erath
Protein Synthesis Adaptation To The Au-Rich Transcriptome Of Plasmodium Falciparum, Jessey Lee Erath
Arts & Sciences Electronic Theses and Dissertations
The process of protein synthesis whereby a messenger RNA is decoded into an amino acid chainis conserved among the domains. Fastidious protein synthesis is necessary for organism survival. However, exceptions negatively affecting the mRNA translation cycle – inadvertently or by design – may occur. Polyadenosine tracts are one such motif causing ribosomal stalling and frameshifting in almost all organisms tested thus far; save Plasmodium spp. Thus, with ~60% of their protein-coding genome harboring polyadenosine tracts, the elucidation of such paradigm-breaking adaptations enabling Plasmodium spp. to translate this typically problematic motif without issue is salient from both basic science and clinical …
A Mechanistic And Genomic Analysis Of Molluscum Contagiosum Virus Immune Evasion, Ian Benjamin Harvey
A Mechanistic And Genomic Analysis Of Molluscum Contagiosum Virus Immune Evasion, Ian Benjamin Harvey
Arts & Sciences Electronic Theses and Dissertations
Molluscum contagiosum virus (MCV) is a common human-specific poxvirus with a proclivity for
infecting children and the immune-compromised. A characteristic MCV infection is restricted to
the epidermal layers of the skin and can persist for weeks to years in an otherwise healthy
individual. The high clinical burden of MCV is at odds with our limited knowledge regarding how
it successfully evades the human immune response, which is in part due to the lack of an animal
model or cell line to propagate the virus. Through this dissertation, we have uncovered and
characterized a novel mechanism by which MC80, a protein …
Mechanisms Of Cross-Presentation By Cdc1s, Derek James Theisen
Mechanisms Of Cross-Presentation By Cdc1s, Derek James Theisen
Arts & Sciences Electronic Theses and Dissertations
Classical dendritic cells (cDCs) are specialized antigen presenting cells that can be divided into distinct subsets based on the types of pathogens they respond to and the type of immune response they generate. The cDC1 subset is specialized in priming CD8 T cell responses through the process of cross-presentation. During cross-presentation, exogenous protein antigens are taken up by cDC1 and presented on MHCI molecules, allowing for the priming of CD8 T cells during conditions when DCs themselves are not directly infected. The ability to cross-present in vivo is unique to cDC1, and is essential for anti-viral responses and rejection of …
Dendritic Cell Development And Function, Vivek Durai
Dendritic Cell Development And Function, Vivek Durai
Arts & Sciences Electronic Theses and Dissertations
Dendritic cells (DCs) are a group of immune cells that include both classical dendritic cells (cDCs) and plasmacytoid dendritic cells (pDCs). cDCs are further comprised of two distinct subsets, cDC1s and cDC2s, which play critical roles in the initiation of innate and adaptive immune responses. Understanding how these lineages develop and function is therefore paramount. All DCs require the receptor tyrosine kinase Flt3 and its ligand Flt3L for their development, but the loss of Flt3L in mice leads to a more severe DC deficiency than does the loss of Flt3. This has led to speculation that Flt3L can bind to …
The Enzymatic Function Of The Tir Domain: From Axon Degeneration To Innate Immunity, Kow Essuman
The Enzymatic Function Of The Tir Domain: From Axon Degeneration To Innate Immunity, Kow Essuman
Arts & Sciences Electronic Theses and Dissertations
The Toll/Interleukin-1 Receptor (TIR) domain is an evolutionarily ancient protein domain conserved from bacteria to eukaryotes, and is an essential signaling component of innate immunity pathways. In animal innate immunity, TIR domains have primarily been described for their scaffolding function in assembling protein complexes in host defense. In plant immunity, TIR domains are key components of the intracellular Nucleotide Binding Leucine rich repeat (NLR) immune receptors that confer resistance to pathogens. These NLR receptors trigger cell death and an immune response upon activation, but their mechanism has remained elusive. In bacteria, TIR domain proteins have been suggested to function as …
Antiviral Nucleoside Inhibitors Of Leishmania Rna Virus 1: Discovery And Mechanism, John Isaac Robinson
Antiviral Nucleoside Inhibitors Of Leishmania Rna Virus 1: Discovery And Mechanism, John Isaac Robinson
Arts & Sciences Electronic Theses and Dissertations
Some Leishmania parasites in the Viannia sub-genus are persistently infected with Leishmania RNA virus 1 (LRV1), a single-segmented double-stranded RNA virus belonging to the family Totiviridae. Infected parasites cause greater pathology and reach higher populations in mouse models of Leishmania infection. In human disease, LRV1+ parasites are correlated with increased frequency of treatment failure and relapse. Efficient methods to detect LRV1 and eliminate it from parasites are required to better understand the role of LRV1 in Leishmania infection. We optimized multiple techniques to measure LRV1 levels in parasites, most notably using flow cytometry to measure the amount of viral capsid …
The Role Of Rna Interference In The Control Of Leishmania Rna Virus 1 Infection, Erin Acino Brettmann
The Role Of Rna Interference In The Control Of Leishmania Rna Virus 1 Infection, Erin Acino Brettmann
Arts & Sciences Electronic Theses and Dissertations
The presence of Leishmania RNA virus 1 (LRV1) in parasites of the Leishmania (Viannia) subgenus increases the virulence of the parasite in mouse models of leishmaniasis and is correlated with treatment failure, relapse, and the development of mucocutaneous disease in humans. LRV1 is not shed or infectious; rather, the infection is persistent, and as yet it is unknown how the parasite controls virus levels. Many eukaryotic organisms use RNA interference (RNAi) to limit virus replication, and Leishmania (Viannia) parasites have an active RNAi pathway. To determine whether Leishmania are capable of using RNAi to control LRV1, we sequenced sRNAs from …