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Articles 151 - 161 of 161
Full-Text Articles in Cell and Developmental Biology
Identification Of Oxygen Optima For Mouse Trophoblast Stem Cells And Human Embryos And The Stress Responses Upon Departing Optima, Yu Yang
Wayne State University Dissertations
Low level of oxygen (O2) occurs physiologically during in vivo embryo development. As developing embryos moving from fallopian tube to uterus, oxygen level gradually decreases to ≤ 5% at the time of blastocyst implantation. Blastocysts are made of two major cell populations, trophoblast cells and inner cell mass, from which trophoblast stem cells (TSCs) and embryonic stem cells (ESCs) are derived respectively. TSCs serve as placental stem cells that later on proliferate and differentiate into placenta. Previous study has shown that 2% O2 is the optimal O2 level for mTSC in vitro growth and potency maintenance, which agrees with their …
Studies Of Sumoylation In Regulating Mif Stability And Rangap1 Nucleo-Cytoplasmic Shuttling In Controlling Its Sumo Modification, Progga Sen
Wayne State University Dissertations
SUMOylation is an essential post-translational modification that regulates a variety of critical cellular pathways ranging from nuclear transport to protein stability. Accumulating lines of evidence have shown that a perturbation of the SUMOylation pathway is associated with human diseases, especially various types of cancer. Our recent proteomic studies revealed a drastic increase in levels of SUMO2/3 modification on the proinflammatory cytokine MIF in the metastatic breast cancer cell line compared to the non-metastatic control cell line. Interestingly, the increase in levels of both MIF and global SUMO-2/3 modification in the metastatic cells are positively correlated to that of unmodified MIF …
The Localization And Function Of Novel Tetrahymena Thermophila Cytoskeletal Genes Bbc29 And Bbc39, Emily K. Moore, Nicole C. Zanolli
The Localization And Function Of Novel Tetrahymena Thermophila Cytoskeletal Genes Bbc29 And Bbc39, Emily K. Moore, Nicole C. Zanolli
Undergraduate Research Symposium Posters
Ciliary function is known to play an important role in many human conditions, including chronic sinus and pulmonary diseases and problems with infertility. Cilia are cytoskeletal structures that protrude from the cell body to facilitate movement. Ciliary structure is conserved throughout eukaryotes, from unicellular to multicellular organisms, including humans. A clear understanding the proteins that compose cilia and how they interact with one another will increase our knowledge about important cytoskeletal elements. Because cilia are difficult to study in multicellular organisms, the unicellular eukaryote Tetrahymena thermophila serves as a useful model for the study of cytoskeletal genes, due to their …
A Family Of Genus-Specific Rnas In Tandem With Dna-Binding Proteins Control Expression Of The Bada Major Virulence Factor Gene In Bartonella Henselae, Nhan Tu, Ronan K. Carroll, Andy Weiss, Lindsey N. Shaw, Gael Nicolas, Sarah Thomas, Amorce Lima, Udoka Okaro, Burt Anderson
A Family Of Genus-Specific Rnas In Tandem With Dna-Binding Proteins Control Expression Of The Bada Major Virulence Factor Gene In Bartonella Henselae, Nhan Tu, Ronan K. Carroll, Andy Weiss, Lindsey N. Shaw, Gael Nicolas, Sarah Thomas, Amorce Lima, Udoka Okaro, Burt Anderson
Molecular Biosciences Faculty Publications
Bartonella henselae is a gram-negative zoonotic bacterium that causes infections in humans including endocarditis and bacillary angiomatosis. B. henselae has been shown to grow as large aggregates and form biofilms in vitro. The aggregative growth and the angiogenic host response requires the trimeric autotransporter adhesin BadA. We examined the transcriptome of the Houston-1 strain of B. henselae using RNA-seq revealing nine novel, highly-expressed intergenic transcripts (Bartonella regulatory transcript, Brt1-9). The Brt family of RNAs is unique to the genus Bartonella and ranges from 194 to 203 nucleotides with high homology and stable predicted secondary structures. Immediately downstream of each …
The E. Coli Protein Ybgl: A Novel Dna Repair Enzyme?, Mason H. Conen, Brooke D. Martin, Kent Sugden, Savannah Whitfield
The E. Coli Protein Ybgl: A Novel Dna Repair Enzyme?, Mason H. Conen, Brooke D. Martin, Kent Sugden, Savannah Whitfield
Undergraduate Theses, Professional Papers, and Capstone Artifacts
Cr(V) is a carcinogen that oxidizes guanine aggressively to form spiroiminodihydantion (Sp) and guanidinohydantoin (Gh), both of which contain an unusual hydantoin moiety that cause G→T transversion mutations at a high rate. Endonuclease VIII (nei) can recognize and excise these oxidation products from DNA and is translated as one of five protein products of the Nei operon in Escherichia coli (E. coli). However, the functions of the other four proteins remain unknown. To address this gap in knowledge, we focused on one of the four that immediately precedes nei, the ybgL protein. Previous work by our group has suggested a …
The Role Of N-Myc Downstream Regulated Gene 1 In Breast Cancer Lipid Metabolism, Christopher James Sevinsky
The Role Of N-Myc Downstream Regulated Gene 1 In Breast Cancer Lipid Metabolism, Christopher James Sevinsky
Legacy Theses & Dissertations (2009 - 2024)
Altered carbohydrate and lipid metabolism are increasingly well characterized hallmarks of aggressive breast cancers. While aerobic glycolysis, or “the Warburg effect”, is a well-established metabolic adaptation exploited by tumor cells, the understanding of unique aspects of cancer lipid metabolism lags behind. This is especially true regarding the coordination of complex lipid synthesis and trafficking pathways, which remains poorly understood. N-Myc Downstream Regulated Gene1 (NDRG1) is overexpressed in many solid tumors, but its function is unclear. The importance of NDRG1 is best exemplified by the effect of null mutations on human physiology: inactivating mutations give rise to the severe autosomal recessive …
The Role Of Inflammasomes In Asbestos-Induced Mesothelial To Fibroblastic Transition, Joyce K. Thompson
The Role Of Inflammasomes In Asbestos-Induced Mesothelial To Fibroblastic Transition, Joyce K. Thompson
Graduate College Dissertations and Theses
Malignant Mesothelioma (MM) is a fatal disease with a low median survival between 8 to 12 months after diagnosis. MM has a long latency period (10-60 years), is causally related to asbestos exposure, and is refractory to all available modes of therapy. Despite the causal association between asbestos exposure and MM however, the mechanisms by which asbestos induces this deadly disease remain unclear. Chronic inflammation due to the presence of asbestos fibers is believed to play an important role in all aspects of MM pathogenesis, from development to progression and resistance. Chronic inflammation has been shown to promote dysregulated wound …
Towards The Complete Proteinaceous Regulome Of Acinetobacter Baumannii, Leila G. Casella, Andy Weiss, Ernesto Pérez-Rueda, J Antonio Ibarra, Lindsey N. Shaw
Towards The Complete Proteinaceous Regulome Of Acinetobacter Baumannii, Leila G. Casella, Andy Weiss, Ernesto Pérez-Rueda, J Antonio Ibarra, Lindsey N. Shaw
Molecular Biosciences Faculty Publications
The emergence of Acinetobacter baumannii strains, with broad multidrug-resistance phenotypes and novel virulence factors unique to hypervirulent strains, presents a major threat to human health worldwide. Although a number of studies have described virulence-affecting entities for this organism, very few have identified regulatory elements controlling their expression. Previously, our group has documented the global identification and curation of regulatory RNAs in A. baumannii. As such, in the present study, we detail an extension of this work, the performance of an extensive bioinformatic analysis to identify regulatory proteins in the recently annotated genome of the highly virulent AB5075 strain. In so …
Functional And Mechanistic Consequences Of Dual Oxidase 1 Suppression In Lung Cancer, Andrew Charles Little
Functional And Mechanistic Consequences Of Dual Oxidase 1 Suppression In Lung Cancer, Andrew Charles Little
Graduate College Dissertations and Theses
The NADPH oxidase homolog, dual oxidase 1 (DUOX1), is an H2O2 producing transmembrane enzyme highly expressed in the airway epithelium. DUOX1-dependent redox signaling has been characterized to regulate many homeostatic processes in the lung epithelium, such as host defense, wound healing, and type II immune responses. Intriguingly, DUOX1 has been found to be suppressed in many epithelial cancers, including lung cancer, by hypermethylation of its promoter. Epigenetic silencing of DUOX1 in cancer is paradoxical to the understanding that tumors harbor elevated levels of reactive oxygen species (ROS), suggesting that DUOX1 may be a tumor suppressor.
Since DUOX1 loss occurs in …
Myo2 Motor Function In The Contractile Ring And The Regulation Of Fission Yeast Cytokinesis, Luther Woodrow Pollard
Myo2 Motor Function In The Contractile Ring And The Regulation Of Fission Yeast Cytokinesis, Luther Woodrow Pollard
Graduate College Dissertations and Theses
Animals, fungi, and amoebas require an actomyosin contractile ring at the division site to perform cytokinesis. The contractile ring initiates and guides the invagination of the plasma membrane as it forms new barriers between the nuclei at the cell equator. Defects in the contractile ring can result in misdirected, delayed, or premature cytokinesis, which leads to abnormal chromosome numbers. Aneuploidies resulting from failed cytokinesis sometimes lead to aggressive forms of cancer. This dissertation was motivated by the goal of better understanding the properties of the contractile ring and how it drives cytokinesis.
Actomyosin is initially recruited to the cell equator …
Changes In Threonyl-Trna Synthetase Expression And Secretion In Response To Endoplasmic Reticulum Stress By Monensin In Ovarian Cancer Cells, Jared Louis Hammer
Changes In Threonyl-Trna Synthetase Expression And Secretion In Response To Endoplasmic Reticulum Stress By Monensin In Ovarian Cancer Cells, Jared Louis Hammer
Graduate College Dissertations and Theses
Aminoacyl-tRNA synthetases (ARS) are a family of enzymes that catalyze the charging of amino acids to their cognate tRNA in an aminoacylation reaction. Many members of this family have been found to have secondary functions independent of their primary aminoacylation function. Threonyl-tRNA synthetase (TARS), the ARS responsible for charging tRNA with threonine, is secreted from endothelial cells in response to both vascular endothelial growth factor (VEGF) and tumor necrosis factor-α (TNF-α), and stimulates angiogenesis and cell migration. Here we show a novel experimental approach for studying TARS secretion, and for observing the role of intracellular TARS in the endoplasmic reticulum …