The use of parallel flow chamber techniques for studying cancer endothelial cell adhesion [abstract]

Abstract only availableFaculty Mentor: Dr. Vladislav Glinskii, BiologyBreast cancer is the second most common cancer in North American women. It has the propensity to metastaticize to bone and bone marrow. Such metastases, causing intractable pain, pathological fractures, and death are massive clinical problems. In order to establish secondary tumors in bones, blood-borne metastatic cells should adhere to the endothelium lining the walls of the bone marrow microvessels. In this study, we evaluated the suitability of the parallel flow chamber technique for studying metastatic breast cancer cell adhesive interaction with cultured human bone marrow microvascular cells (HBMEC). We have found that, similar to leukocytes, a fraction of breast cancer cells infuse through the parallel flow chamber over the HBMEC monolayer exhibiting rolling behavior. Some rolling cells adhere permanently to the endothelium. The rolling and stable adhesion kinetics depends on experimental conditions such as shear rate and shear stress. In conclusion, the parallel flow chamber technique represents the valuable method of choice for analyzing the adhesive interaction of metastatic cancer cells with endothelium under conditions of physiological flow conditions

Benefits and Risks of Big Data

Big data is one of the most prevalent topics in information systems today. The purpose of this paper is to explore big data, its past uses, legal history, current and potential security risks, and potential future uses. This literature review primarily focuses on the benefits of big data as well as the risks associated with big data. The research provides a general overview of big data and some of the technologies related to big data. The authors conclude with suggestions for future research of big data

A Wicked Problem: The Implementation of Clinical Guidelines Application to Optimize Patient Care (UHN OpenLab)

The purpose of our partnership with the UHN OpenLab was to discover the barriers involved with automating the sporadic release of clinical practice guidelines (CPGs) into the Innovate Guidelines Application (IGA). The problem is considered wicked—interlocking challenges cannot be addressed by a single solution. Accordingly, the goal was to explore the barriers of stakeholders and specialization groups, general guideline issues, and the considerations of healthcare professionals and public perception. An initial literature review was conducted to discover unidentified problems before a first draft of the systems map was created. Subsequently, connections were formed across problems and each was categorized based on degree of complexity. A white paper was drafted to complement the systems map, explain the problem clearly, and highlight areas to be further explored. The recommendation brief outlines where further action could be taken. Key findings of the white paper include that guideline standardization and the use of automation were significant complications with the project. The lack of standardization between guidelines makes categorizing them tedious as there are few common elements or formats. This problem is further perpetuated by new guidelines, which continue to be made without commonality between producers. A recommendation for the UHN OpenLab team is the use of automation software to sort pre-existing guidelines efficiently. Additionally, there should be a push for a checklist screen to generate commonality between future guidelines. This list for guideline producers would act as a completion and quality control marker while still allowing freedom in design and format

Decolonising Philosophy

Based on Maldonado-Torres’s formulation of the term, we conceive the decolonial turn as a form of liberating and decolonising reason beyond the liberal and Enlightened emancipation of rationality, and beyond the more radical Euro-critiques that have failed to consistently challenge the legacies of Eurocentrism and white male heteronormativity (often Eurocentric critiques of Eurocentrism). We complement Maldonado-Torres’s account of the decolonial turn in philosophy, theory and critique by providing an analysis of the trajectories of academic philosophy and clarifying the relevance of decolonising philosophy and of the decolonial turn for current efforts in transforming philosophy in face of the challenges of social movements such as the Third World Liberation Front and Black Lives Matter in the United States, and Rhodes Must Fall in South Africa and England. After a brief analysis of the trajectory and current status of philosophy as a discipline in the modern Western research university, we provide examples of the decolonial turn and of decolonising philosophy in three areas: the engagement with (1) Asian and (2) Latin American philosophies, and (3) debates in the philosophy of race and gender

Education in Cross-Cultural Settings: Psychological Underpinnings of Achievement in Papua New Guinea

Education and achievement in Papua New Guinea has received minimal attention in the psychological and educational literature. Although student motivation and achievement have been investigated in a large variety of cultures throughout the world, this has not been substantially extended to the developing world. The current study investigated a selection of psychological processes that contribute to student achievement in the context of a majority, indigenous and developing culture. Motivational goal orientations, learning and self-regulatory processes of 359 students from Papua New Guinea (PNG) were investigated. Structural equation modeling investigated the relations between the psychological variables. Results are discussed in the context of McInerney’s (2007) model of student achievement in cross-cultural settings

Challenges, Opportunities, and Adaptations of a College Preparatory 4-H Youth Development Program during COVID-19

SARS-CoV-2 (COVID-19) has proliferated across the United States, and in the process, it has disrupted all sense of normalcy. Because adolescents are in a critical period for growth and development, youth are particularly susceptible to negative impacts of disruption from COVID-19. Therefore, sustaining youth development programs is essential to ensuring positive youth development occurs despite significant challenges. Unfortunately, the implementation of programs that maintain safety precautions can be challenging. Many programs have been forced to either cancel all activities or to transition program elements to a virtual format. Rural Medical and Science Scholars (RMSS) program administrative staff made the decision to transition to a virtual delivery. Despite only having a few weeks to reshape the program, RMSS administrative staff were able to innovatively adapt to new challenges in order to deliver a successful program. The success of the program extends beyond its participants. By understanding potential program barriers and successful adaptation methods, other youth development programs will be better equipped to sustain program activities and youth outreach during the COVID-19 pandemic

Prospectus, April 13, 2005

https://spark.parkland.edu/prospectus_2005/1009/thumbnail.jp

Mutational Analysis of the Chlamydia muridarum Plasticity Zone

Pathogenically diverse Chlamydia spp. can have surprisingly similar genomes. C. trachomatis isolates that cause trachoma, sexually transmitted genital tract infections (chlamydia) and invasive lymphogranuloma venereum (LGV), and the murine strain C. muridarum share 99% of their gene content. A region of high genomic diversity between Chlamydia spp. termed the Plasticity Zone (PZ) may encode niche-specific virulence determinants that dictate pathogenic diversity. We hypothesized that PZ genes might mediate the greater virulence and IFN-γ resistance of C. muridarum compared to C. trachomatis in the murine genital tract. To test this hypothesis, we isolated and characterized a series of C. muridarum PZ nonsense mutants. Strains with nonsense mutations in chlamydial cytotoxins, guaBA-add and a phospholipase D homolog developed normally in cell culture. Two of the cytotoxin mutants were less cytotoxic than wild-type suggesting that the cytotoxins may be functional. However, none of the PZ nonsense mutants exhibited increased IFN-γ sensitivity in cell culture or were profoundly attenuated in a murine genital tract infection model. Our results suggest that C. muridarum PZ genes are transcribed and some may produce functional proteins, but are dispensable for infection of the murine genital tract

Increased serum kallistatin levels in type 1 diabetes patients with vascular complications

BACKGROUND: Kallistatin, a serpin widely produced throughout the body, has vasodilatory, anti-angiogenic, anti-oxidant, and anti-inflammatory effects. Effects of diabetes and its vascular complications on serum kallistatin levels are unknown. METHODS: Serum kallistatin was quantified by ELISA in a cross-sectional study of 116 Type 1 diabetic patients (including 50 with and 66 without complications) and 29 non-diabetic controls, and related to clinical status and measures of oxidative stress and inflammation. RESULTS: Kallistatin levels (mean(SD)) were increased in diabetic vs. control subjects (12.6(4.2) vs. 10.3(2.8) μg/ml, p = 0.007), and differed between diabetic patients with complications (13.4(4.9) μg/ml), complication-free patients (12.1(3.7) μg/ml), and controls; ANOVA, p = 0.007. Levels were higher in diabetic patients with complications vs. controls, p = 0.01, but did not differ between complication-free diabetic patients and controls, p > 0.05. On univariate analyses, in diabetes, kallistatin correlated with renal dysfunction (cystatin C, r = 0.28, p = 0.004; urinary albumin/creatinine, r = 0.34, p = 0.001; serum creatinine, r = 0.23, p = 0.01; serum urea, r = 0.33, p = 0.001; GFR, r = -0.25, p = 0.009), total cholesterol (r = 0.28, p = 0.004); LDL-cholesterol (r = 0.21, p = 0.03); gamma-glutamyltransferase (GGT) (r = 0.27, p = 0.04), and small artery elasticity, r = -0.23, p = 0.02, but not with HbA1c, other lipids, oxidative stress or inflammation. In diabetes, geometric mean (95%CI) kallistatin levels adjusted for covariates, including renal dysfunction, were higher in those with vs. without hypertension (13.6 (12.3-14.9) vs. 11.8 (10.5-13.0) μg/ml, p = 0.03). Statistically independent determinants of kallistatin levels in diabetes were age, serum urea, total cholesterol, SAE and GGT, adjusted r2 = 0.24, p < 0.00001. CONCLUSIONS: Serum kallistatin levels are increased in Type 1 diabetic patients with microvascular complications and with hypertension, and correlate with renal and vascular dysfunction

Rudimentary G-Quadruplex-Based Telomere Capping In Saccharomyces Cerevisiae

Telomere capping conceals chromosome ends from exonucleases and checkpoints, but the full range of capping mechanisms is not well defined. Telomeres have the potential to form G-quadruplex (G4) DNA, although evidence for telomere G4 DNA function in vivo is limited. In budding yeast, capping requires the Cdc13 protein and is lost at nonpermissive temperatures in cdc13-1 mutants. Here, we use several independent G4 DNA-stabilizing treatments to suppress cdc13-1 capping defects. These include overexpression of three different G4 DNA binding proteins, loss of the G4 DNA unwinding helicase Sgs1, or treatment with small molecule G4 DNA ligands. In vitro, we show that protein-bound G4 DNA at a 3\u27 overhang inhibits 5\u27-\u3e 3\u27 resection of a paired strand by exonuclease I. These findings demonstrate that, at least in the absence of full natural capping, G4 DNA can play a positive role at telomeres in vivo