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  • 1.
    Saxenborn, Patricia
    University of Skövde, School of Health and Education.
    Investigating the Effect of 1,25-Dihydroxyvitamin D3 and Retinoic acid on Viability, Differentiation and Migration in NB69 and T47D cells.2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Cancer is a well-known disease that many people encounter in their lifetime. There is constantly research being performed on cancer to find treatments for those types where none has been found, or even find better or more efficient treatments for those cancer types where there already is treatment available. Two types of cancer that have been studied in this thesis are neuroblastoma, which is a form of cancer that affects children and infants, and breast cancer. The 13-cis retinoic acid is presently used as treatment for neuroblastoma post-surgery and post-chemo therapy, but the treatment is quite invasive. It has been shown that 1,25-dihydroxyvitamin D3 is a good candidate for cancer treatment, and the aim of this study was to investigate whether a combination of 1,25-dihydroxyvitamin D3 and two forms of retinoic acid, all-trans and 13-cis, could cause synergistic effects on cell viability, invasion, and differentiation of the cells. The two vitamins were combined at different concentrations and ratios to make the different treatments. A proliferation assay with absorbance measurement was performed to determine cell viability, and a migration assay was performed to observe the migratory properties of the cells after treatment. The results concluded that the combined treatments had greater effect than the single treatments on cell viability in both neuroblastoma and breast cancer cells. The results showed that single treatment of 13-cis retinoic acid and combined treatments had the highest effect on invasion and differentiation on neuroblastoma cells.

  • 2.
    Saxenborn, Patricia
    University of Skövde, School of Bioscience.
    Sepsis: Genotypic analysis of clinical Klebsiella spp. using next-generation sequencing2018Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response system and can occur when the immune system over- or under- reacts to an infection. Klebsiella spp. has been found to be one of the leading causes of sepsis, and the increasing occurrence of antibiotic resistance observed has become a major concern in clinical care. To study the genome and increase knowledge of the biodiversity of K. pneumoniae, K. variicola, and K. oxytoca, bacterial isolates were collected from blood, urine, nasopharynx, and wounds of patients with suspected sepsis. Next-generation sequencing was performed, and the presence of antibiotic resistance genes and plasmids were studied. Furthermore, a prediction of traits for each phylogroup was performed and the results from whole-genome sequencing were compared to phenotypic results. Among the K. pneumoniae isolates obtained, almost half had been misidentified by standard phenotypic methods and were found to be K. variicola, K. quasipneumoniae, and K. quasivariicola. A significant difference in the number of antibiotic resistance genes were observed between K. pneumoniae and K. variicola compared to K. oxytoca, however no significant difference was observed between K. pneumoniae and K. variicola, suggesting the underestimated pathogenicity of K. variicola. A genetic agreement was observed between the type of beta-lactamase harboured and presence or absence of nitrogen-fixation genes to the phylogroup, providing a way of species identification. Further studies should be conducted on the pathogenicity and virulence of K. variicola and K. quasipneumoniae to avoid misidentification, find organism-specific treatments, and narrow down the antibiotic prescription.

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