Matching Items (534)
Description
Strategies are needed to improve repopulation of decellularized lung scaffolds with stromal and functional epithelial cells. We demonstrate that decellularized mouse lungs recellularized in a dynamic low fluid shear suspension bioreactor, termed the rotating wall vessel (RWV), contained more cells with decreased apoptosis, increased proliferation and enhanced levels of total RNA compared to static recellularization conditions. These results were observed with two relevant mouse cell types: bone marrow-derived mesenchymal stromal (stem) cells (MSCs) and alveolar type II cells (C10). In addition, MSCs cultured in decellularized lungs under static but not bioreactor conditions formed multilayered aggregates. Gene expression and immunohistochemical analyses suggested differentiation of MSCs into collagen I-producing fibroblast-like cells in the bioreactor, indicating enhanced potential for remodeling of the decellularized scaffold matrix. In conclusion, dynamic suspension culture is promising for enhancing repopulation of decellularized lungs, and could contribute to remodeling the extracellular matrix of the scaffolds with subsequent effects on differentiation and functionality of inoculated cells.
ContributorsCrabbe, Aurelie (Author) / Liu, Yulong (Author) / Sarker, Shameema (Author) / Bonenfant, Nicholas R. (Author) / Barrila, Jennifer (Author) / Borg, Zachary D. (Author) / Lee, James J. (Author) / Weiss, Daniel J. (Author) / Nickerson, Cheryl (Author) / ASU Biodesign Center Immunotherapy, Vaccines and Virotherapy (Contributor) / Biodesign Institute (Contributor)
Created2015-05-11
Description
Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain χ7122 (O78∶K80∶H9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-2 (IncFII), and pChi7122-3 (IncI2)]; and a small plasmid pChi7122-4 (ColE2-like), has been used for many years as a model strain to study the molecular mechanisms of ExPEC pathogenicity and zoonotic potential. We previously sequenced and characterized the plasmid pChi7122-1 and determined its importance in systemic APEC infection; however the roles of the other pChi7122 plasmids were still ambiguous. Herein we present the sequence of the remaining pChi7122 plasmids, confirming that pChi7122-2 and pChi7122-3 encode an ABC iron transport system (eitABCD) and a putative type IV fimbriae respectively, whereas pChi7122-4 is a cryptic plasmid. New features were also identified, including a gene cluster on pChi7122-2 that is not present in other E. coli strains but is found in Salmonella serovars and is predicted to encode the sugars catabolic pathways. In vitro evaluation of the APEC χ7122 derivative strains with the three large plasmids, either individually or in combinations, provided new insights into the role of plasmids in biofilm formation, bile and acid tolerance, and the interaction of E. coli strains with 3-D cultures of intestinal epithelial cells. In this study, we show that the nature and combinations of plasmids, as well as the background of the host strains, have an effect on these phenomena. Our data reveal new insights into the role of extra-chromosomal sequences in fitness and diversity of ExPEC in their phenotypes.
ContributorsMellata, Melha (Author) / Maddux, Jacob (Author) / Nam, Timothy (Author) / Thomson, Nicholas (Author) / Hauser, Heidi (Author) / Stevens, Mark P. (Author) / Mukhopadhyay, Suman (Author) / Sarker, Shameema (Author) / Crabbe, Aurelie (Author) / Nickerson, Cheryl (Author) / Santander, Javier (Author) / Curtiss, Roy (Author) / ASU Biodesign Center Immunotherapy, Vaccines and Virotherapy (Contributor) / Biodesign Institute (Contributor)
Created2012-01-04
Description
The two chapters of this thesis focus on different aspects of DNA and the properties of nucleic acids as the whole. Chapter 1 focuses on the structure of DNA and its relationship to enzymatic efficiency. Chapter 2 centers itself on threose nucleic acid and optimization of a step in the path to its synthesis. While Chapter 1 discusses DNA and Uracil-DNA Glycosylase with regards to the base excision repair pathway, Chapter 2 focuses on chemical synthesis of an intermediate in the pathway to the synthesis of TNA, an analogous structure with a different saccharide in the sugar-phosphate backbone.
Chapter 1 covers the research under Dr. Levitus. Four oligonucleotides were reacted for zero, five, and thirty minutes with uracil-DNA glycosylase and subsequent addition of piperidine. These oligonucleotides were chosen based on their torsional rigidities as predicted by past research and predictions. The objective was to better understand the relationship between the sequence of DNA surrounding the incorrect base and the enzyme’s ability to remove said base in order to prepare the DNA for the next step of the base excision repair pathway. The first pair of oligonucleotides showed no statistically significant difference in enzymatic efficiency with p values of 0.24 and 0.42, while the second pair had a p value of 0.01 at the five-minute reaction. The second pair is currently being researched at different reaction times to determine at what point the enzyme seems to equilibrate and react semi-equally with all sequences of DNA.
Chapter 2 covers the research conducted under Dr. Chaput. Along the TNA synthesis pathway, the nitrogenous base must be added to the threofuranose sugar. The objective was to optimize the original protocol of Vorbrüggen glycosylation and determine if there were better conditions for the synthesis of the preferred regioisomer. This research showed that toluene and ortho-xylene were more preferable as solvents than the original anhydrous acetonitrile, as the amount of preferred isomer product far outweighed the amount of side product formed, as well as improving total yield overall. The anhydrous acetonitrile reaction had a final yield of 60.61% while the ortho-xylene system had a final yield of 94.66%, an increase of approximately 32%. The crude ratio of preferred isomer to side product was also improved, as it went from 18% undesired in anhydrous acetonitrile to 4% undesired in ortho-xylene, both values normalized to the preferred regioisomer.
Chapter 1 covers the research under Dr. Levitus. Four oligonucleotides were reacted for zero, five, and thirty minutes with uracil-DNA glycosylase and subsequent addition of piperidine. These oligonucleotides were chosen based on their torsional rigidities as predicted by past research and predictions. The objective was to better understand the relationship between the sequence of DNA surrounding the incorrect base and the enzyme’s ability to remove said base in order to prepare the DNA for the next step of the base excision repair pathway. The first pair of oligonucleotides showed no statistically significant difference in enzymatic efficiency with p values of 0.24 and 0.42, while the second pair had a p value of 0.01 at the five-minute reaction. The second pair is currently being researched at different reaction times to determine at what point the enzyme seems to equilibrate and react semi-equally with all sequences of DNA.
Chapter 2 covers the research conducted under Dr. Chaput. Along the TNA synthesis pathway, the nitrogenous base must be added to the threofuranose sugar. The objective was to optimize the original protocol of Vorbrüggen glycosylation and determine if there were better conditions for the synthesis of the preferred regioisomer. This research showed that toluene and ortho-xylene were more preferable as solvents than the original anhydrous acetonitrile, as the amount of preferred isomer product far outweighed the amount of side product formed, as well as improving total yield overall. The anhydrous acetonitrile reaction had a final yield of 60.61% while the ortho-xylene system had a final yield of 94.66%, an increase of approximately 32%. The crude ratio of preferred isomer to side product was also improved, as it went from 18% undesired in anhydrous acetonitrile to 4% undesired in ortho-xylene, both values normalized to the preferred regioisomer.
ContributorsTamirisa, Ritika Sai (Author) / Levitus, Marcia (Thesis director) / Stephanopoulos, Nicholas (Committee member) / Windman, Todd (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This study aimed to ascertain and measure the effect of news media on the public perception of crime scene investigation. Experimental subjects participated in a survey that collected relative demographic information, media habits, knowledge of crime scene investigation techniques, and relative accuracy of forensic science. The subjects were then exposed to excerpts of news media that diminished accuracy of DNA analysis and blood spatter analysis techniques, after which subjects answered questions about their opinions of crime scene investigation procedures after reading the materials presented. A total of 258 subjects were surveyed, after which data was compiled and analyzed using Chi-squared test as well as the McNemar test. Experimental data found that 52% of all respondents that participated in the survey had their opinions changed regarding the accuracy of crime scene investigation procedures following exposure to media. Further analysis of the data found that respondents in the 18-24 age demographic were significantly more likely to have their opinions changed following exposure to media as well as respondents with less education (defined as having earned less than an undergraduate degree). There was also significance found for the relationship between the amount of time spent per week watching CSI/Law Enforcement programs and opinions changed following exposure to media as well as the relationship between the amount of time spent per week viewing local news programs and opinions changed following exposure to media. Finally, there was significance found for the relationship between the time spent per week visiting social media sites and opinions changed following exposure to media.
ContributorsKemper, Jessica Danielle (Author) / Kobojek, Kimberly (Thesis director) / Jacobson, David (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This thesis project investigated the linguistic competence of four brothers in an attempt to evaluate the effects that assimilation in the United States has on language loss within second generation speakers. The project employed the use of a case study and autoethnography in order to take a closer look at the concepts of assimilation, acculturation, and language loss, as well to provide a real world example of their interrelatedness. The second generation, or the heritage speakers in the family, were the focus of the study in order to provide a closer look at how the heritage language was retained within said generation. The project found that although there has historically been a push to assimilate immigrants into the American society, my brothers and I are not being assimilated as much as we are being acculturated. The project also found that although we grew up speaking Spanish at home, education in the language was essential in developing fluency in the subcategories of reading and writing, which are often neglected in the household.
ContributorsDreher, Brian Francis (Author) / Ovando, Carlos (Thesis director) / Martin, Thomas (Committee member) / School of Molecular Sciences (Contributor) / School of International Letters and Cultures (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Circular Dichroism (CD) and electron paramagnetic resonance (EPR) were used to investigate the metal-binding sites of five different four-helix bundles, which have slight differences in the population of their side chains. Of the four-helix bundles, three have central dinuclear metal binding sites; two of these three also have outer dinuclear metal binding sites. The other two peptides have two identical, non-central, dinuclear metal binding sites. The CD spectra showed changes in the secondary structure of the peptides, and X-band EPR spectra of these peptides revealed the unique four peak signal of Cu(II). These findings improve our understanding of the metal binding environments of these peptides.
ContributorsCanarie, Elizabeth Rose (Author) / Allen, James (Thesis director) / Wolf, George (Committee member) / School of Mathematical and Statistical Sciences (Contributor) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This study uses an exploratory questionnaire to identify major barriers that Syrian refugees face when obtaining basic healthcare. To supplement questionnaire data, providers were also interviewed in order to understand whether identified barriers were internal, due to refugee perceptions, or external, due to gaps in the system that prevented refugees from obtaining healthcare. The study also proposes solutions to enhance health services in order to achieve health equity.
ContributorsShah, Marzia (Author) / Haines, Chad (Thesis director) / Saikia, Yasmin (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Breast cancer is the leading cause of cancer-related deaths of women in the united states. Traditionally, Breast cancer is predominantly treated by a combination of surgery, chemotherapy, and radiation therapy. However, due to the significant negative side effects associated with these traditional treatments, there has been substantial efforts to develop alternative therapies to treat cancer. One such alternative therapy is a peptide-based therapeutic cancer vaccine. Therapeutic cancer vaccines enhance an individual's immune response to a specific tumor. They are capable of doing this through artificial activation of tumor specific CTLs (Cytotoxic T Lymphocytes). However, in order to artificially activate tumor specific CTLs, a patient must be treated with immunogenic epitopes derived from their specific cancer type. We have identified that the tumor associated antigen, TPD52, is an ideal target for a therapeutic cancer vaccine. This designation was due to the overexpression of TPD52 in a variety of different cancer types. In order to start the development of a therapeutic cancer vaccine for TPD52-related cancers, we have devised a two-step strategy. First, we plan to create a list of potential TPD52 epitopes by using epitope binding and processing prediction tools. Second, we plan to attempt to experimentally identify MHC class I TPD52 epitopes in vitro. We identified 942 potential 9 and 10 amino acid epitopes for the HLAs A1, A2, A3, A11, A24, B07, B27, B35, B44. These epitopes were predicted by using a combination of 3 binding prediction tools and 2 processing prediction tools. From these 942 potential epitopes, we selected the top 50 epitopes ranked by a combination of binding and processing scores. Due to the promiscuity of some predicted epitopes for multiple HLAs, we ordered 38 synthetic epitopes from the list of the top 50 epitope. We also performed a frequency analysis of the TPD52 protein sequence and identified 3 high volume regions of high epitope production. After the epitope predictions were completed, we proceeded to attempt to experimentally detected presented TPD52 epitopes. First, we successful transduced parental K562 cells with TPD52. After transduction, we started the optimization process for the immunoprecipitation protocol. The optimization of the immunoprecipitation protocol proved to be more difficult than originally believed and was the main reason that we were unable to progress past the transduction of the parental cells. However, we believe that we have identified the issues and will be able to complete the experiment in the coming months.
ContributorsWilson, Eric Andrew (Author) / Anderson, Karen (Thesis director) / Borges, Chad (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
As the economy becomes more technologically driven the need for people in science, technology, engineering, and mathematical (STEM) fields also increases. STEM fields have been overrun with white males. Congress has been trying to promote minority groups in these fields for thirty years with little success. One of the largest underrepresented groups is individuals with disabilities. This thesis project focuses on STEM outreach for a particular group of disabled, the deaf and hard of hearing. There is a long history of deaf and hard of hearing children being poorly educated due to actions by the hearing community. Deaf and hard of hearing children are isolated not only from other deaf individuals but from their natural language, sign language. The goal of this project is to promote better educational practices and opportunities for deaf and hard of hearing children that also encourage an interest in STEM fields and education. This goal is met through the creation of the website deafstem.com. The website promotes the ideals set by the Bill of Rights for Deaf and Hard of Hearing Children established in part by the National Association of the Deaf (NAD). These include the ideals that a deaf or hard of hearing child has the same ability and capacity for language as any other child and that language pertains to both English and American Sign Language (ASL), that the families of these children play a significant role in their success, and that these children should have access and exposure to deaf and hard of hearing adults. The website build a bridge between deaf children, their hearing family, and the deaf community while promoting STEM fields by providing ASL dictionaries for both STEM and everyday vocabulary, biographies of influential deaf adults in STEM fields, and extracurricular activities for deaf and hard of hearing children.
ContributorsAlbi, Shannon Melissa (Author) / Howard, Pamela (Thesis director) / Barnett, Juliet (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Currently, treatment for multiple myeloma (MM), a hematological cancer, is limited to post-symptomatic chemotherapy combined with other pharmaceuticals and steroids. Even so, the immuno-depressing cancer can continue to proliferate, leading to a median survival period of two to five years. B cells in the bone marrow are responsible for generating antigen-specific antibodies, but in MM the B cells express mutated, non-specific monoclonal antibodies. Therefore, it is hypothesized that antibody-based assay and therapy may be feasible for detecting and treating the disease. In this project, 330k peptide microarrays were used to ascertain the binding affinity of sera antibodies for MM patients with random sequence peptides; these results were then contrasted with normal donor assays to determine the "immunosignatures" for MM. From this data, high-binding peptides with target-specificity (high fluorescent intensity for one patient, low in all other patients and normal donors) were selected for two MM patients. These peptides were narrowed down to two lists of five (10 total peptides) to analyze in a synthetic antibody study. The rationale behind this originates from the idea that antibodies present specific binding sites on either of their branches, thus relating high binding peptides from the arrays to potential binding targets of the monoclonal antibodies. Furthermore, these peptides may be synthesized on a synthetic antibody scaffold with the potential to induce targeted delivery of radioactive or chemotherapeutic molecular tags to only myelomic B cells. If successful, this would provide a novel alternative to current treatments that is less invasive, has fewer side effects, more specifically targets the cause of MM, and reliably diagnoses the cancer in the presymptomatic stage.
ContributorsBerry, Jameson (Co-author) / Buelt, Allison (Co-author) / Johnston, Stephen (Thesis director) / Diehnelt, Chris (Committee member) / School of Molecular Sciences (Contributor) / School of International Letters and Cultures (Contributor) / Division of Teacher Preparation (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05