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Articles 31 - 60 of 61
Full-Text Articles in Cell Biology
Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration In Mice, Matthew D. Magda
Post-Injury Calcium Chelation Rescues Skeletal Muscle Regeneration In Mice, Matthew D. Magda
Honors Scholar Theses
During aging the ability of skeletal muscle to regenerate after injury wanes until muscle integrity cannot be maintained. In this study it is shown that calcium chelation can restore young-like regenerative ability in an aged mouse model of skeletal muscle regeneration.
Dikar-Induced Synthetic Lethality In A Drosophila Model Of Cag Repeat Diseases Does Not Result From An Expression Feedback Loop, Daniel Camacho
Dikar-Induced Synthetic Lethality In A Drosophila Model Of Cag Repeat Diseases Does Not Result From An Expression Feedback Loop, Daniel Camacho
Honors Scholar Theses
Human CAG repeat diseases manifest themselves through the common pathology of neurodeneration. This pathological link is attributed to the property shared by all nine of these diseases: an expanded polyglutamine (polyQ) tract. The most evident result of polyQ expansion is protein aggregation, and it is believed that this phenomenon is partly responsible for conferring cytotoxic properties on the mutated protein. Apart from sequestering the mutated protein, cellular aggregates are able to incorporate native proteins via polyQ-mediated aggregation, thus disrupting important cellular pathways. Using Drosophila melanogaster as a disease model, researchers have been able to compile collections of these so-called disease …
Investigations In Enhancing The Reproducibility Of Implantable Amperometric Glucose Biosensors For Mass Production, Dipesh Manharbhai Patel
Investigations In Enhancing The Reproducibility Of Implantable Amperometric Glucose Biosensors For Mass Production, Dipesh Manharbhai Patel
Honors Scholar Theses
Implantable glucose sensors for Diabetes management should possess several attributes such as linearity, sensitivity, selectivity, long life time and should elicit no negative tissue response. Based on this, the UConn implantable glucose sensor team has developed a 5-layer sensor architecture that simultaneously affords the aforementioned requirements. However, the large scale production of these 5-layer sensors is inhibited by the lack of high sensor-to-sensor reproducibility. Herein, we investigate the origin of sensor-to-sensor irreproducibility and develop methodologies for large-scale fabrication of these devices.
Characterizing The Role Of Cortactin In Actin Pedestal Assembly By Enterohemorrhagic Escherichia Coli (Ehec), Sarah E. Grout
Characterizing The Role Of Cortactin In Actin Pedestal Assembly By Enterohemorrhagic Escherichia Coli (Ehec), Sarah E. Grout
Honors Scholar Theses
Enterohemorrhagic Escherichia coli (EHEC) is a major foodborne cause of bloody diarrhea and renal failure. During colonization of the intestine, EHEC injects the transmembrane receptor protein Tir and the cytoplasmic effector protein EspFU into host cells to reorganize the actin cytoskeleton into adhesion “pedestals.” EspFU has been shown to bind and activate the actin nucleation factor N-WASP to drive actin polymerization into pedestals. However, EspFU can still assemble pedestals in cells lacking N-WASP, suggesting that this effector protein is able to also trigger N-WASP-independent pathways of actin polymerization during infection. Cortactin is an atypical nucleation factor that localizes to pedestals, …
Dietary Analysis And Epigenetic Comparisons Of Drosphila Melanogaster Through Multiple Generations, Xu (Kevin) F. Zheng
Dietary Analysis And Epigenetic Comparisons Of Drosphila Melanogaster Through Multiple Generations, Xu (Kevin) F. Zheng
Holster Scholar Projects
Nutrition and the lack thereof has been a demanding issue in both the undeveloped and developed country. The unbalance diet between healthy and unhealthy diet has led to many of the problems presented in society such as obesity, heart disorders, and loss of longevity. It is now known that calorie may not provide the most accurate information in terms of the lifestyle and the well-being of humans. Rather the composition of the calorie is what becomes integral in people's understanding of the effect of food physiologically. With this knowledge, we seek to use a Drosophila melanogaster as a model organism …
Elucidating The Mechanism Of Antimigratory Activity Of Cardiac Glycosides, Joshua H. Johnson
Elucidating The Mechanism Of Antimigratory Activity Of Cardiac Glycosides, Joshua H. Johnson
Honors Scholar Theses
The focus of this research is on cell migration and how it can be better understood through the use of small molecules that modulate cell migratory activity. The results have particular relevance in the realm of cancer pharmacology. Cardiac glycosides, which are known inhibitors of the eukaryotic Na+/K+-ATPase, have been determined to have antimigratory activities through the screening of several small molecule libraries. Here we investigate the antimigratory activities of the cardiac glycoside digitoxin as well as its analogs that we synthesized. Antimigratory activity was determined by conducting a wound closure assay with MDA-MB-231 human breast …
Identifying Progenitor Cells Of Heterotopic Ossification, Eileen E. Semancik
Identifying Progenitor Cells Of Heterotopic Ossification, Eileen E. Semancik
Honors Scholar Theses
Heterotopic Ossification (HO) is the abnormal formation of bone within extraskeletal soft tissues. The condition can occur through both genetic and acquired means. Acquired cases of HO result from invasive surgery or traumatic injuries, with increasing prevalence of ectopic skeletogenesis as a result of combat-related blast injuries. HO has been characterized to some extent, including the histological features and the mutation underlying the genetic form, but the cells resident in skeletal muscle that represent the progenitors of heterotopic bone have yet to be determined. Only a few publications have attempted to definitively determine the progenitor cells in this disorder. Findings …
Improvements To The Forensic Analysis Of Mitochondrial Dna Typing, Elizabeth Montano
Improvements To The Forensic Analysis Of Mitochondrial Dna Typing, Elizabeth Montano
Honors Scholar Theses
Sequence analysis of human mitochondrial DNA (mtDNA) is an effective and reliable tool for the genetic characterization of forensic samples. The nature of the mitochondrial genome (mtgenome), its high copy number and small size (~17kb) makes it more resistant to degradation and more stable than nuclear DNA. For this reason mitochondrial DNA is often the only feasible option for the forensic analysis of environmentally compromised samples. Currently the forensic analysis of the mtgenome is restricted to the hypervariable regions, also known as the Displacement loop (d-loop). Previous studies, confirmed in the Strausbaugh lab, have demonstrated an increased variability in the …
Metallothionein Gene Dose And The Immune Response, Meaghan Roy-O-Reilly
Metallothionein Gene Dose And The Immune Response, Meaghan Roy-O-Reilly
Honors Scholar Theses
Metallothionein (MT) is a small, cysteine-rich protein with significant immunomodulatory activity. It has been shown to play a critical role in important cellular mechanisms including heavy metal detoxification, essential metal management and the inflammatory response. MT production can be induced by a number of cellular stressors and acts to lessen the harmful effects of oxidizing agents and heavy metal exposure. Previous studies have shown that the dose of the metallothionein gene present in an individual may have significant effects on the adaptive immune response, yet the mechanism behind this phenomenon remains unknown. We hypothesize that the gene dose of metallothionein …
The Expression Of T-Box (Tbx3) In The Bovine Mammary Gland, Maria L. Procopio Ms.
The Expression Of T-Box (Tbx3) In The Bovine Mammary Gland, Maria L. Procopio Ms.
Master's Theses
Development of the bovine mammary gland is a complex process that is regulated by several hormones, growth factors and transcription factors including but not limited to growth hormone (GH), insulin-like growth factor (IGF)-I and T-box (Tbx)2 and 3. Tbx2 and Tbx3 are transcription factors required for mammary gland development in humans and known to regulate cell cycle. In addition, there is recent evidence that GH increases expression of Tbx3 in osteoblasts independent of IGF-I. Based on these findings, we hypothesized GH and IGF-I will increase Tbx2 and Tbx3 expression in bovine mammary epithelial cells (MEC), the cell responsible for milk …
Characterization Of Arginine-82 Mutants With Non-Native Chromophores, Vivek Alaigh
Characterization Of Arginine-82 Mutants With Non-Native Chromophores, Vivek Alaigh
Honors Scholar Theses
Bacteriorhodopsin, found in most halobacteria, is an integral protein that contains seven transmembrane alpha helices and an organic chromophore, all-trans retinal. Light energy is captured by the protein and results in a series of spectrally discrete intermediates that conclude with a proton being pumped across the membrane from the cytoplasmic side to the extracellular milieu. The most blue-shifted photo-intermediate, the M state, has been of interest for protein-based holographic memory storage devices. Bacteriorhodopsin mutants were prepared with either a 4-hydroxy retinal or 3,4-dihydro retinal analog: R82A, R82C, R82H, R82K, R82N and R82Q. The objective of this research was to investigate …
Modeling Human Immune Response To The Lyme Disease-Causing Bacteria, Yevhen Rutovytskyy
Modeling Human Immune Response To The Lyme Disease-Causing Bacteria, Yevhen Rutovytskyy
Honors Scholar Theses
The purpose of this project is to develop and analyze a mathematical model for the pathogen-host interaction that occurs during early Lyme disease.
Based on the known biophysics of motility of Borrelia burgdorferi and a simple model for the immune response, a PDE model was created which tracks the time evolution of the concentrations of bacteria and activated immune cells in the dermis. We assume that a tick bite inoculates a highly localized population of bacteria into the dermis. These bacteria can multiply and migrate. The diffusive nature of the migration is assumed and modeled using the heat equation. Bacteria …
Expression Of The Porcine Reproductive And Respiratory Syndrome Virus Non-Structural Protein 3 (Nsp 3) In Escherichia Coli, Lidia Beka
Honors Scholar Theses
Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) is single-stranded, positive-sense RNA virus in the family Arteriviridae, order Nidovirales. PRRSV is the most economically significant viral infection of swine herds in the United States. The single-stranded RNA genome is 15 kb in length and encodes 9 open reading frames (ORF1a, ORF1b, ORF2a, ORF2b and ORFs 3 through 7). ORFs 1a and 1b encode for 13 non-structural proteins (nsp) that are suggested to be involved in transcription and viral genome replication. The exact role of non-structural proteins in PRRSV cycle is still unknown. Moreover, there is a limited availability of reagents such …
Design And Bio-Production Of A Nanoparticle Avian Influenza Vaccine, Kashif N. Ather
Design And Bio-Production Of A Nanoparticle Avian Influenza Vaccine, Kashif N. Ather
Honors Scholar Theses
Influenza is one of the most common diseases in the world and the cause for numerous deaths every year. The primary method of combating the disease is the influenza vaccine, which is produced by inoculating chicken eggs with inactivated virus. An emerging solution is to use Self-Assembling Polypeptide Nanoparticles (SAPN) to elicit an immune response in the body, rather than using inactivated viruses. This project focuses on the synthesis, purification, and refolding of two peptide constructs, BN5C and S43, which are specific protein sequences that under the right conditions will refold into the 3-dimensional structures necessary for producing an immune …
Quorum Sensing In Archaea, Charles Mackin
Quorum Sensing In Archaea, Charles Mackin
Honors Scholar Theses
Bacteria coordinate cell density dependent behaviors by communicating through chemical intermediaries in a process called quorum sensing. In a bacterial culture, individual cells will constitutively produce signal molecules, termed autoinducers, and export them into the environment. When the concentration of autoinducers reaches a threshold, the cells sense that they are in a specific situation, which requires the upregulation of certain genes. This upregulation causes the bacteria to produce proteins that allow them to take part in a coordinated population-wide behavior.
In bacteria that are naturally competent, or capable of importing DNA from the environment, the expression of competence genes is …
Characterizing The Role Of The Bacterial Metallothionein, Smta, In Mammalian Infection, Stephanie R. Davis
Characterizing The Role Of The Bacterial Metallothionein, Smta, In Mammalian Infection, Stephanie R. Davis
Honors Scholar Theses
Mammalian metallothioneins (MT) are induced by various immunomodulatory molecules and are involved in a spectrum of immune processes such as essential metal homeostasis, detoxification of certain heavy metals, inflammation, and immune cell trafficking [1-3]. A bacterial metallothionein, SmtA, shares some sequence homology with mammalian MT as well as its metal-binding capabilities [4]. In addition to its ability to sequester heavy metals, eukaryotic MT has also been shown to scavenge free radicals such as reactive oxygen and nitrogen species (ROS, RNS), interfering with their toxic effects on cells and potentially influencing their regulatory roles in cell proliferation and differentiation [5, 6]. …
Biomarker Signature Classification Of Various Stress Forms, Chana L. Rich
Biomarker Signature Classification Of Various Stress Forms, Chana L. Rich
Honors Scholar Theses
Various types of stressful conditions can have unique and important effects on immunity and can lead to dramatic consequences to health. For my University Scholar project, the characteristic biomarker signatures produced from a set of diverse stressors (e.g. psychological, biological and chemical) are being investigated. A biomarker signature is a distinctive biological indicator of a specific condition. High-throughput tools for the measurement of different cellular products have the potential to further our understanding of human disease and facilitated the identification of new biomarkers in all areas of medicine. The hypothesis that each form of stress, psychological, chemical and physical, will …
Mechanistic Study Of The Small Molecule Inhibitor Dx-52-1, Junru Cui
Mechanistic Study Of The Small Molecule Inhibitor Dx-52-1, Junru Cui
Master's Theses
Cell migration is a basic biological process that is fundamental to several normal and disease processes such as embryonic development, tissue repair, immune function, angiogenesis and cancer cell invasion and metastasis. Small organic molecules inhibiting cell migration can be used as both research probes and therapeutic agents. DX-52-1, a semisynthetic derivative of the natural product quinocarmycin (also known as quinocarcin), inhibits the migration of Madin-Darby canine kidney epithelial cells with nanomolar concentration. We have identified galectin-3, a multifunctional protein whose best-known function is its sugar binding ability, as a secondary target of DX-52-1 with functions in cell motility. In addition, …
Characterization Of The Putative Xyloglucan Glycosyltransferase Gt14 In Arabidopsis Thaliana, Najam R. Syed
Characterization Of The Putative Xyloglucan Glycosyltransferase Gt14 In Arabidopsis Thaliana, Najam R. Syed
Honors Scholar Theses
Plant cell walls largely consist of matrix polysaccharides that are linked to cellulose microfibrils. Xyloglucan, the primary hemicellulose of the cell wall matrix, consists of a repeating glucose tetramer structure with xylose residues attached to the first three units ('XXXG'). In Arabidopsis thaliana, the core XXXG structure is further modified by enzymatic addition of galactose and fucose residues to the xylose side chains to produce XLXG, XXLG, XLLG and XLFG structures. GT14 is a putative glycosyltransferase in the GT47 gene family. Initial predictions of GT14's hydrophobic regions, based on its translated amino acid sequence, are almost identical to its Arabidopsis …
Alkylphenol Contamination In Homarus Americanus, Jennifer Renee Urban
Alkylphenol Contamination In Homarus Americanus, Jennifer Renee Urban
Honors Scholar Theses
Alkylphenols are pollutants that are present in marine sediments and fishes. In earlier work it has been discovered that alkylphenols are present in the Homarus americanus, or the American lobster. Research suggests that alkylphenols could behave as endocrine disruptors as they have been found to affect juvenile hormone activity. It has been hypothesized that lobsters may be able to rid themselves of alkylphenol contamination through secreting these compounds into the environment or sequestering them in their tissues. In this study, I address the question of how lobsters may rid themselves of alkylphenols by analyzing hemolymph, muscle, gill, and shell samples …
Determination Of The Myogenic Potential Of Human Embryonic Stem Cell-Derived Mesenchymal Stem Cells, Rory Coleman
Determination Of The Myogenic Potential Of Human Embryonic Stem Cell-Derived Mesenchymal Stem Cells, Rory Coleman
Honors Scholar Theses
Human embryonic stem cells (hESCs) have the potential to
differentiate to all adult somatic cells. This property makes hESCs a very promising area of research for the treatment of disorders in which specific cell populations need to be restored. Despite this potential, research that focuses on producing mesodermally derived cell populations from hESCs is decidedly limited, notwithstanding the prevalence of disorders involving mesodermal tissues for which treatment options are limited. Skeletal muscle myoblasts are derivatives of mesodermal cells and are characterized by the expression of the MyoD gene. These cells are difficult to obtain from hESCs in a reproducible and …
Macroh2a1 Regulation During The Cell Cycle Of Mouse Embryonic Stem Cells, Persis S. Thomas
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 cells …
Contribution Of The Novel C-Terminal Domain To The Ribosome Binding Activities Of Virulence Regulator Bipa, Heeren Makanji
Contribution Of The Novel C-Terminal Domain To The Ribosome Binding Activities Of Virulence Regulator Bipa, Heeren Makanji
Honors Scholar Theses
Bacterial GTPases regulate many cell functions, including the stress response, signal recognition, protein synthesis, and cell differentiation, through a molecular switch that is activated and deactivated depending on their nucleotide bound state (1). A member of the translational family of bacterial GTPases along with LepA and EF-G, BipA is a 67 kD protein that is essential for virulence and the stress response. Crystal structures from the Robinson lab have shown a unique C-terminal domain on BipA that has been implicated in ribosome binding. Using N-terminal deletion constructs, we have shown that the C-terminal domain is necessary, but not sufficient, to …
Analysis Of The Phosphorylated Forms Of Protein Kinase R, Christine Quartararo
Analysis Of The Phosphorylated Forms Of Protein Kinase R, Christine Quartararo
Honors Scholar Theses
Protein Kinase R (PKR) is induced by interferon and activated by dsRNA. Subsequent autophosphorylation and phosphorylation of eIF2alpha inhibits viral replication. In the latent state PKR exists as an unphosphorylated monomer. Work in the Cole laboratory has shown two additional states, a phosphorylated monomeric state (pPKRm) and a phosphorylated dimeric state (pPKRd). RNA serves as a scaffold bringing two PKRs together allowing dimerization and autophosphorylation to occur. The contribution of each state to the function of PKR remains unclear. Western blots were performed to examine the phosphorylation states of the essential residues,
T446 and T451. Activity assays have shown activation …
Characterization Of A Hypothetical Protein Critical For The Symbiotic Interaction Of Aeromonas Veronii And Hirudo Verbana, Kaitlin Vaughan
Characterization Of A Hypothetical Protein Critical For The Symbiotic Interaction Of Aeromonas Veronii And Hirudo Verbana, Kaitlin Vaughan
Honors Scholar Theses
The digestive tract symbiosis of the medicinal leech, Hirudo verbana, is a model system for studying the genes required for microbial colonization of digestive tracts, as H. verbana has only two species of bacteria that dominate the crop microbiota, Aeromonas veronii and a Rikenella-like bacterium. Signature-tagged mutagenesis (STM) of the A.
veronii strain, HM21R, revealed genes required for the colonization of the digestive tract. One of these mutants, JG573, has an interrupted gene that is predicted to encode a hypothetical protein. The region flanking the transposon insertion of this mutant was sequenced by primer walking.
Comparison of the flanking DNA …
Characterizing The Role Of Phaeobacter In The Mortality Of The Squid, Euprymna Scolopes, Brian Shawn Wong Won
Characterizing The Role Of Phaeobacter In The Mortality Of The Squid, Euprymna Scolopes, Brian Shawn Wong Won
Honors Scholar Theses
The subject of our study is the Hawaiian bobtail squid, Euprymna scolopes, which is known for its model symbiotic relationship with the bioluminescent bacterium, Vibrio fischeri. The interactions between E. scolopes and V. fischeri provide an exemplary model of the biochemical and molecular dynamics of symbiosis since both members can be cultivated separately and V. fischeri can be genetically modified 1. However, in a laboratory setting, the mortality of embryonic E. scolopes can be a recurrent problem. In many of these fatalities, the egg cases display a pink-hued biofilm, and rosy pigmentation has also been noted in the deaths of …
Knockdown Of Kiaa0319 Reduces Dendritic Spine Density, Daniel Young Kim
Knockdown Of Kiaa0319 Reduces Dendritic Spine Density, Daniel Young Kim
Honors Scholar Theses
Developmental Dyslexia is a reading disorder that affects individuals that possess otherwise normal intelligence. Until the four candidate dyslexia susceptibility genes were discovered, the cause of cortical malformations found in post mortem dyslexic brains was unclear. Normal brain development is crucial for the proper wiring of the neural circuitry that allow an individual to perform cognitive tasks like reading. For years, familial and twin studies have suggested that there was a genetic basis to the causation of dyslexia. Kiaa0319 was among the candidate dyslexia susceptibility genes that were ascertained. KIAA0319 is located on Chromosome 6p22.2-22.3 and has been found to …
Effects Of Estrogen On Muscle Damage In Response To An Acute Resistance Exercise Protocol, Megan R. Wolf
Effects Of Estrogen On Muscle Damage In Response To An Acute Resistance Exercise Protocol, Megan R. Wolf
Honors Scholar Theses
Creatine Kinase (CK) is used as a measure of exercise-induced muscle membrane damage. During acute eccentric (muscle lengthening) exercise, muscle sarcolemma, sarcoplasmic reticulum, and Z-lines are damaged, thus causing muscle proteins and enzymes to leak into the interstitial fluid.
Strenuous eccentric exercise produces an elevation of oxygen free radicals, which further increases muscle damage. Muscle soreness and fatigue can be attributed to this membrane damage. Estradiol, however, may preserve membrane stability post-exercise (Brancaccio, Maffulli, & Limongelli, 2007; Carter, Dobridge, & Hackney, 2001; Tiidus, 2001). Because estradiol has a similar structure to Vitamin E, which is known to have antioxidant properties, …
Optimization Of Protein Expression Of Four Transcription Factors Using Chaperone Proteins, Kaitlin Wilson
Optimization Of Protein Expression Of Four Transcription Factors Using Chaperone Proteins, Kaitlin Wilson
Honors Scholar Theses
Embryonic stem cells are unique in their ability to grow indefinitely while maintaining both pluripotency and self-renewal capabilities. These stem cells could be the answer to solving many of the debilitating and devastating diseases suffered by humans. Recently, the use of human derived embryonic stem cells has been effective in animal models in the treatment of spinal cord injuries (Kierstead et al., 2005).
Although the study of embryonic stem cells has become increasingly popular in the last decade, there is still much research to be done to increase the expression of valuable embryonic proteins which will induce pluripotency in the …
Biological Signatures Of Vaccine Responses, Lorena Nunez
Biological Signatures Of Vaccine Responses, Lorena Nunez
Honors Scholar Theses
The set of host- and pathogen-specific molecular features of a disease comprise its “signature”. We hypothesize that biological signatures enables distinctions between vaccinated vs. infected individuals. In our research, using porcine samples, protocols were developed that could also be used to identify biological signatures of human disease. Different classes of molecular features will be tested during this project, including indicators of basic immune capacity, which are being studied at this instance.
These indicators of basic immune response such as porcine cytokines and antibodies were validated using Enzyme-linked immunosorbent assay (ELISA). This is an established method that detects antigens by their …