Novel serological biomarkers to aid in the detection and clinical management of pancreatic cancer patients are urgently needed. In the present study, we performed in-depth proteomic analysis of conditioned media from six pancreatic cancer cell lines (MIA-PaCa2, PANC1, BxPc3, CAPAN1, CFPAC1 and SU.86.86), the normal pancreatic ductal epithelial cell line HPDE, and pancreatic juice samples from cancer patients for identification of novel biomarker candidates. Using 2D-LC-MS/MS, a total of 3479 non-redundant proteins were identified with ≥2 peptides. Subsequent label-free protein quantification and integrative analysis of the biological fluids resulted in the generation of candidate biomarkers, of which five proteins were shown to be significantly elevated in plasma from pancreatic cancer patients in a preliminary assessment. Further verification of two of the proteins in ~200 serum samples demonstrated the ability of these proteins to significantly improve the area under the receiver operating characteristic curve of CA19.9 from 0.84 to 0.91.

Novel serological biomarkers to aid in the detection and clinical management of pancreatic cancer patients are urgently needed. In the present study, we performed in-depth proteomic analysis of conditioned media from six pancreatic cancer cell lines (MIA-PaCa2, PANC1, BxPc3, CAPAN1, CFPAC1 and SU.86.86), the normal pancreatic ductal epithelial cell line HPDE, and pancreatic juice samples from cancer patients for identification of novel biomarker candidates. Using 2D-LC-MS/MS, a total of 3479 non-redundant proteins were identified with ≥2 peptides. Subsequent label-free protein quantification and integrative analysis of the biological fluids resulted in the generation of candidate biomarkers, of which five proteins were shown to be significantly elevated in plasma from pancreatic cancer patients in a preliminary assessment. Further verification of two of the proteins in ~200 serum samples demonstrated the ability of these proteins to significantly improve the area under the receiver operating characteristic curve of CA19.9 from 0.84 to 0.91.

Serum-free mouse embryo (SFME) cells are derived in medium in which serum is replaced with growth factors and other supplements. They display unusual properties. They do not lose proliferative potential or show gross chromosomal aberration upon extended culture, they depend on epidermal growth factor (EGF) for survival, and are reversibly growth inhibited by plasma and serum. In the presence of transforming growth factor beta (TGF-β) SFME cells express the astrocyte marker, glial fibrillary acidic protein (GFAP). The growth inhibitory activity of human plasma on serum-free mouse embryo cells was investigated. Human plasma did not inhibit SFME cells transformed with the human Ha-ras oncogene. The activity was present in delipidated plasma and was not dialyzable against 1 M acetic acid. The activity could be precipitated by methanol, bound to concanavalin Aagarose and was retarded by Sephadex G-50 in 200 mM acetic acid. A fifty to hundred fold purification was achieved, although the differential inhibition of untransformed versus transformed cells was lost in the course of the purification. Using the technique of differential screening of a cDNA library a calf serum- and TGF -β-regulated mRNA species was identified in SFME cells. This mRNA was approximately 8.5 kilobases in size and brain-specific. Picomolar quantities of TGF-β caused an increase of this message in SFME cells within four hours. This increase was reversed when TGF-β was removed from the culture medium. / Graduation date: 1993

Abstract Nutritional status affects every aspect of a child?s health. Thorough nutritional assessment is hampered by the lack of a single comprehensive tool, which can cover all aspects of nutritional assessment. In three distinct studies, this thesis investigated the nutritional status of hospitalised children, children with coeliac disease and children with inflammatory bowel disease. Study 1 The objectives of this study were to assess prevalence of malnutrition and nutritional risk, and define demographic and anthropometric factors associated with nutritional risk among hospitalized children. In this cross sectional study, 157 hospitalised children were assessed for nutritional status using nutritional risk score (NRS) and anthropometric measurements. We found that 4.5%, 8.9%, 15.1% and 10.4% children were wasted, stunted, overweight and obese respectively. However, with the NRS, 47.8% of the children were at high nutritional risk. These children at high risk had lower weight for age (p=0.02), lower BMI percentiles for age (p=0.001) and longer hospitalization (p=0.001) than children at no risk. Study 2 The objectives of this study were to determine nutritional parameters in children with coeliac disease. Twenty-five children with coeliac disease and an equal number of age and gender matched controls were enrolled and anthropometric measurements, BIA and leptin levels were analysed in all. No significant differences were found between the children with coeliac disease and controls in these parameters. BMI percentile correlated with leptin levels in children with coeliac disease. Study 3 The objectives of this study were to determine anthropometric parameters and leptin levels in children with IBD and ascertain if BMI correlates with leptin levels in these children. Thirty children with IBD and 60 age and gender matched controls were enrolled. Anthropometric measurements and leptin levels were analysed and compared with controls. IBD children had significantly low weight for age (p=0.002), BMI percentiles (p=0.001) and leptin levels (p=0.009) compared to controls. There was a correlation between BMI and leptin levels in IBD children. In conclusion, this thesis has shown that one quarter of hospitalized children were overweight or obese, and further, that half of the hospitalised children were at high risk of nutritional deterioration and these children had longer hospital stay than children at no risk. Children with coeliac disease had similar anthropometric measurements, body compartments and leptin levels to controls. However, children with IBD had lower anthropometric measurements and leptin levels, indicating under-nutrition. Nutritional assessment should be a mandatory part of clinical management with nutritional status assessed by various tools including NRS, anthropometry, BIA and leptin levels.

Abstract Nutritional status affects every aspect of a child?s health. Thorough nutritional assessment is hampered by the lack of a single comprehensive tool, which can cover all aspects of nutritional assessment. In three distinct studies, this thesis investigated the nutritional status of hospitalised children, children with coeliac disease and children with inflammatory bowel disease. Study 1 The objectives of this study were to assess prevalence of malnutrition and nutritional risk, and define demographic and anthropometric factors associated with nutritional risk among hospitalized children. In this cross sectional study, 157 hospitalised children were assessed for nutritional status using nutritional risk score (NRS) and anthropometric measurements. We found that 4.5%, 8.9%, 15.1% and 10.4% children were wasted, stunted, overweight and obese respectively. However, with the NRS, 47.8% of the children were at high nutritional risk. These children at high risk had lower weight for age (p=0.02), lower BMI percentiles for age (p=0.001) and longer hospitalization (p=0.001) than children at no risk. Study 2 The objectives of this study were to determine nutritional parameters in children with coeliac disease. Twenty-five children with coeliac disease and an equal number of age and gender matched controls were enrolled and anthropometric measurements, BIA and leptin levels were analysed in all. No significant differences were found between the children with coeliac disease and controls in these parameters. BMI percentile correlated with leptin levels in children with coeliac disease. Study 3 The objectives of this study were to determine anthropometric parameters and leptin levels in children with IBD and ascertain if BMI correlates with leptin levels in these children. Thirty children with IBD and 60 age and gender matched controls were enrolled. Anthropometric measurements and leptin levels were analysed and compared with controls. IBD children had significantly low weight for age (p=0.002), BMI percentiles (p=0.001) and leptin levels (p=0.009) compared to controls. There was a correlation between BMI and leptin levels in IBD children. In conclusion, this thesis has shown that one quarter of hospitalized children were overweight or obese, and further, that half of the hospitalised children were at high risk of nutritional deterioration and these children had longer hospital stay than children at no risk. Children with coeliac disease had similar anthropometric measurements, body compartments and leptin levels to controls. However, children with IBD had lower anthropometric measurements and leptin levels, indicating under-nutrition. Nutritional assessment should be a mandatory part of clinical management with nutritional status assessed by various tools including NRS, anthropometry, BIA and leptin levels.

Abstract Nutritional status affects every aspect of a child?s health. Thorough nutritional assessment is hampered by the lack of a single comprehensive tool, which can cover all aspects of nutritional assessment. In three distinct studies, this thesis investigated the nutritional status of hospitalised children, children with coeliac disease and children with inflammatory bowel disease. Study 1 The objectives of this study were to assess prevalence of malnutrition and nutritional risk, and define demographic and anthropometric factors associated with nutritional risk among hospitalized children. In this cross sectional study, 157 hospitalised children were assessed for nutritional status using nutritional risk score (NRS) and anthropometric measurements. We found that 4.5%, 8.9%, 15.1% and 10.4% children were wasted, stunted, overweight and obese respectively. However, with the NRS, 47.8% of the children were at high nutritional risk. These children at high risk had lower weight for age (p=0.02), lower BMI percentiles for age (p=0.001) and longer hospitalization (p=0.001) than children at no risk. Study 2 The objectives of this study were to determine nutritional parameters in children with coeliac disease. Twenty-five children with coeliac disease and an equal number of age and gender matched controls were enrolled and anthropometric measurements, BIA and leptin levels were analysed in all. No significant differences were found between the children with coeliac disease and controls in these parameters. BMI percentile correlated with leptin levels in children with coeliac disease. Study 3 The objectives of this study were to determine anthropometric parameters and leptin levels in children with IBD and ascertain if BMI correlates with leptin levels in these children. Thirty children with IBD and 60 age and gender matched controls were enrolled. Anthropometric measurements and leptin levels were analysed and compared with controls. IBD children had significantly low weight for age (p=0.002), BMI percentiles (p=0.001) and leptin levels (p=0.009) compared to controls. There was a correlation between BMI and leptin levels in IBD children. In conclusion, this thesis has shown that one quarter of hospitalized children were overweight or obese, and further, that half of the hospitalised children were at high risk of nutritional deterioration and these children had longer hospital stay than children at no risk. Children with coeliac disease had similar anthropometric measurements, body compartments and leptin levels to controls. However, children with IBD had lower anthropometric measurements and leptin levels, indicating under-nutrition. Nutritional assessment should be a mandatory part of clinical management with nutritional status assessed by various tools including NRS, anthropometry, BIA and leptin levels.

The aim of this study was to evaluate new methods to improve detection and investigation of the effects of chronic or subclinical infection with Trypanosoma evansi in various mammalian species. Some of the more resistant host species, including pigs and buffaloes, are present in large feral populations in the northern parts of Australia, the area where T. evansi is most likely to gain entry to the country. Existing tests are not sufficiently reliable to detect all cases of disease and they cannot distinguish acute from chronic infections. Furthermore, the tests have different sensitivities in different host species. Surveillance for trypanosomiasis in Australia is problematic because of the need to work in remote parts of northern Australia where provision of a cold-chain for traditional blood and serum storage is difficult. An existing dried blood storage system was modified by treating cotton lint filter paper (Whatman #903) with a commercial post coating buffer (TropBio, Queensland). This treatment increased the longevity of antibodies to T. evansi in serum and blood stored on the paper (detected using an antibody-detection ELISA) compared to samples stored on plain paper, especially when the papers were stored under humid conditions and at high ambient temperatures. Attempts were made to improve the diagnostic utility and repeatability of antibody-ELISAs through the use of 2 recombinant T. brucei antigens (PFRA and GM6) and to optimize a competitive ELISA using RoTat 1.2 variable surface antigen and its monoclonal antibody. Antibody-detection using the two recombinant proteins was not sufficiently specific to enable their use for the detection of T. evansi. The RoTat 1.2 cELISA had good sensitivity and specificity (75% and 98% respectively) when used to test serum from cattle and buffaloes experimentally infected with T. evansi and uninfected animals. However, the test was not able to detect anti-T. evansi antibodies in serum from wallabies, pigs, a dog or a horse that were experimentally infected with T. evansi. The inability of the cELISA to detect anti-T. evansi antibodies may be due to the small number of samples tested or the lack of RoTat 1.2 specific antibodies in the animals tested. The feasibility of using an enzymatic test to detect trypanosome aminotransferase or antibodies to this enzyme was evaluated. Prior publications suggested that the detection of TAT was an appropriate diagnostic tool for the detection of T. evansi infection in camels. However, the results from this study did not support the use of this test for the detection of T. evansi infection in cattle or buffaloes with low to moderate parasitaemia. Trypanosomiasis is an immunological disease that affects most of the body’s organs, with more severe disease developing over time. Attempts were made to determine key cytokine and biochemical patterns that would distinguish infected from uninfected animals and acute from chronic infections. The results from this study showed that there was no specific pattern in serum cytokines or serum biochemistry that could be used to distinguish infected from uninfected animals, or different stages of disease. Immunohistochemistry was used on tissues from buffaloes and mice experimentally infected with T. evansi and T. brucei gambiense respectively to characterise the cellular immune response that was present. The immune response was predominantly cell mediated, with CD3+ T lymphocyte and macrophage infiltration occurring in most tissues. In end stage disease there was often suppression of the immune system with disruption of the architecture of the spleen and a decrease in B lymphocytes in the circulation. Trypanosomes were rarely visible in the tissues and were only seen in those animals with high parasitaemia. Lesions generally became more severe over time, but there was a large variation between animals, which suggests that immunohistochemistry is unsuitable as a diagnostic tool.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 4 uppsatser.

Thesis (M.S.) -- Mississippi State University. Department of Chemistry. / Title from title screen. Includes bibliographical references.

Thesis (Ph. D.) -- University of Texas Southwestern Medical Center at Dallas, 2001. / Vita. Bibliography: 91-102.