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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Correlação dos parâmetros endócrinos e comportamentais em cadelas abandonadas em programa de ressocialização / Correlation of endocrine and behavioral parameters in abandoned dogs during ressocialization program

Lesnau, Giuliano Gustavo 14 April 2014 (has links)
O mecanismo do estresse já é conhecido e apresenta dois momentos: o estresse agudo que libera fatores termogênicos e inflamatórios mediados por Interleucina 6 (IL6) e o crônico que busca a supressão da reação inflamatória e é mediado pela presença de cortisol. Quando cães abandonados são alojados em abrigos, também passam por um momento de adaptação, entretanto não existe até o momento um programa de ressocialização destes cães instituído em nível governamental, visando o bem estar junto a seus novos donos. A intervenção da ressocialização neste momento, a correlação do comportamento de cães com parâmetros fisiológicos e endócrinos relativos ao estresse ainda não foram descritas, o que suscita a hipótese de que a mesma possa amenizar os impactos traumáticos do abandono. Foram utilizadas 27 cadelas divididas em 3 grupos: com donos, abandonadas não treinadas e abandonadas treinadas. As cadelas abandonadas e treinadas foram depois adotadas. O adestramento durou 15 min/dia por 21 dias. A avaliação comportamental (etograma e etoteste) foi realizada a cada 7 dias e a avaliação dos parâmetros fisiológicos (frequência cardíaca, frequência respiratória, taxa de oxigenação sanguínea, pulsação) bem como a coleta de saliva, diariamente. Após a adoção, os grupos foram acompanhados por mais uma semana. Os dados foram analisados por ANOVA, após verificação da normalidade dos mesmos. A correlação entre os parâmetros foi analisada por meio do teste de correlação de Pearson. Os valores foram considerados diferentes para p<0,05. O resultado mais surpreendente foi a manutenção da IL6 em níveis baixos após a cirurgia de castração nas cadelas treinadas, enquanto os outros dois grupos, submetidos à mesma cirurgia tiveram elevação significativa desta citocina. Os resultados do treinamento foram mais evidentes nos etogramas após a adoção: houve melhora da interação dos cães com a nova família, aumento das atitudes de brincadeira, e maior receptividade aos novos donos. O abanar de cauda como comportamento de comunicação apareceu com frequência muito maior nas cadelas treinadas depois de adotadas. Cadelas não treinadas após a adoção manifestaram mais comportamento de ociosidade, desestímulo e depressão, reduzindo seu estado de alerta. Estes resultados sugerem que o evento do adestramento tranquiliza as cadelas no ambiente estressante do abrigo, melhora seus parâmetros fisiológicos, controla comportamentos de medo tornando-as mais aptas a se adaptarem melhor após a adoção. Não houve diferenças no cortisol entre os três grupos (p > 0,05). No entanto, a concentração de IL6 foi menor nos cães treinados em relação aos demais (p < 0,05). No que diz respeito ao etoteste, houve correlação negativa entre IL6, sociabilidade e treinabilidade em todos os grupos (r=-0,48 a -0,72; p<0,04) e com temperamento somente nos cães abandonados (r=-0,72; p=0,02). Após a adoção, observou-se correlação positiva entre o cortisol e treinabilidade no grupo de cães treinados (r = 0,99; p<0,0001). O adestramento permitiu maior aprendizado e concentração e maior socialização dos cães após a adoção. O aumento de IL6 interfere negativamente nesta ressocialização. Sugerimos que o cortisol contribua para a treinabilidade e aumento de IL6 seja um indicativo de falta de bem-estar. / The mechanism of stress is already known and can be divided in two stages: acute stress, which releases thermogenic factors and inflammatory -mediated interleukin 6 (IL6) and chronic stress, which suppresses the inflammatory response and is mediated by the presence of cortisol. When stray dogs are housed in shelters, they undergo a period of adaptation; however, until now there is not a ressocialization program at the governmental level aiming to improve their welfare along with their new owners. The ressocialization program beginning when dogs arrive to the shelter and the correlation of dogs´ behavior with physiological and endocrine parameters related to stress have not yet been described , which raises the hypothesis that it can decrease the traumatic impact of abandonment. Twenty seven healthy bitches were divided into 3 groups: with owners, abandoned not trained and abandoned trained. The trained and abandoned dogs were later adopted. The training lasted 15 min / day for 21 days. The behavioral assessment (ethogram and ethotest) was performed every 7 days and physiological parameters assessment (heart rate, respiratory rate, blood oxygenation rate, pulse) as well as saliva collection, daily. After the adoption, the bitches were evaluated for 7 additional days. Data were analyzed by ANOVA, after testing the results for normality. The correlation between parameters was analyzed using the Pearson correlation test. Values were considered different at p < 0.05. The most surprisingly result was the maintenance of low levels of IL6 in trained dogs after neutering, whereas the other two groups showed a significant increase of IL6. The consequences of training were evident in ethograms after adoption: there was an improvement of the interaction of dogs with the new family, attitudes of playing were more numerous, and dogs showed a greater receptivity to the new owners. The tail wagging, as communication behavior, appeared much more frequently in trained dogs after adoption. Abandoned dogs after adoption manifested more idleness, discouragement and depression behaviors and reduced alertness. These results suggest that the training reassures bitches in the stressful shelter environment, improves their physiological parameters, controls fear behaviors making them more able to adapt to the new environment after adoption. There were no differences in cortisol among the groups (p > 0.05). However, IL-6 concentration was lower in trained than in abandoned or owned dogs (p < 0.05). Concerning the ethotest, there was a negative correlation between IL6, sociability and trainability in all groups (r = -0.48 to -0.72; p <0.04) and only in relation to temper in abandoned dogs (r = - 0.72; p = 0.02). Upon adoption, there was a positive correlation between cortisol and trainability in trained dogs (r = 0.99, p < 0.0001). Training allowed greater learning and concentration and greater socialization of dogs after adoption. The increase in IL6 seems to impair this re-socialization. We suggest that cortisol contributes to the trainability and increases of IL6 denote lack of welfare.
2

Correlação dos parâmetros endócrinos e comportamentais em cadelas abandonadas em programa de ressocialização / Correlation of endocrine and behavioral parameters in abandoned dogs during ressocialization program

Giuliano Gustavo Lesnau 14 April 2014 (has links)
O mecanismo do estresse já é conhecido e apresenta dois momentos: o estresse agudo que libera fatores termogênicos e inflamatórios mediados por Interleucina 6 (IL6) e o crônico que busca a supressão da reação inflamatória e é mediado pela presença de cortisol. Quando cães abandonados são alojados em abrigos, também passam por um momento de adaptação, entretanto não existe até o momento um programa de ressocialização destes cães instituído em nível governamental, visando o bem estar junto a seus novos donos. A intervenção da ressocialização neste momento, a correlação do comportamento de cães com parâmetros fisiológicos e endócrinos relativos ao estresse ainda não foram descritas, o que suscita a hipótese de que a mesma possa amenizar os impactos traumáticos do abandono. Foram utilizadas 27 cadelas divididas em 3 grupos: com donos, abandonadas não treinadas e abandonadas treinadas. As cadelas abandonadas e treinadas foram depois adotadas. O adestramento durou 15 min/dia por 21 dias. A avaliação comportamental (etograma e etoteste) foi realizada a cada 7 dias e a avaliação dos parâmetros fisiológicos (frequência cardíaca, frequência respiratória, taxa de oxigenação sanguínea, pulsação) bem como a coleta de saliva, diariamente. Após a adoção, os grupos foram acompanhados por mais uma semana. Os dados foram analisados por ANOVA, após verificação da normalidade dos mesmos. A correlação entre os parâmetros foi analisada por meio do teste de correlação de Pearson. Os valores foram considerados diferentes para p<0,05. O resultado mais surpreendente foi a manutenção da IL6 em níveis baixos após a cirurgia de castração nas cadelas treinadas, enquanto os outros dois grupos, submetidos à mesma cirurgia tiveram elevação significativa desta citocina. Os resultados do treinamento foram mais evidentes nos etogramas após a adoção: houve melhora da interação dos cães com a nova família, aumento das atitudes de brincadeira, e maior receptividade aos novos donos. O abanar de cauda como comportamento de comunicação apareceu com frequência muito maior nas cadelas treinadas depois de adotadas. Cadelas não treinadas após a adoção manifestaram mais comportamento de ociosidade, desestímulo e depressão, reduzindo seu estado de alerta. Estes resultados sugerem que o evento do adestramento tranquiliza as cadelas no ambiente estressante do abrigo, melhora seus parâmetros fisiológicos, controla comportamentos de medo tornando-as mais aptas a se adaptarem melhor após a adoção. Não houve diferenças no cortisol entre os três grupos (p > 0,05). No entanto, a concentração de IL6 foi menor nos cães treinados em relação aos demais (p < 0,05). No que diz respeito ao etoteste, houve correlação negativa entre IL6, sociabilidade e treinabilidade em todos os grupos (r=-0,48 a -0,72; p<0,04) e com temperamento somente nos cães abandonados (r=-0,72; p=0,02). Após a adoção, observou-se correlação positiva entre o cortisol e treinabilidade no grupo de cães treinados (r = 0,99; p<0,0001). O adestramento permitiu maior aprendizado e concentração e maior socialização dos cães após a adoção. O aumento de IL6 interfere negativamente nesta ressocialização. Sugerimos que o cortisol contribua para a treinabilidade e aumento de IL6 seja um indicativo de falta de bem-estar. / The mechanism of stress is already known and can be divided in two stages: acute stress, which releases thermogenic factors and inflammatory -mediated interleukin 6 (IL6) and chronic stress, which suppresses the inflammatory response and is mediated by the presence of cortisol. When stray dogs are housed in shelters, they undergo a period of adaptation; however, until now there is not a ressocialization program at the governmental level aiming to improve their welfare along with their new owners. The ressocialization program beginning when dogs arrive to the shelter and the correlation of dogs´ behavior with physiological and endocrine parameters related to stress have not yet been described , which raises the hypothesis that it can decrease the traumatic impact of abandonment. Twenty seven healthy bitches were divided into 3 groups: with owners, abandoned not trained and abandoned trained. The trained and abandoned dogs were later adopted. The training lasted 15 min / day for 21 days. The behavioral assessment (ethogram and ethotest) was performed every 7 days and physiological parameters assessment (heart rate, respiratory rate, blood oxygenation rate, pulse) as well as saliva collection, daily. After the adoption, the bitches were evaluated for 7 additional days. Data were analyzed by ANOVA, after testing the results for normality. The correlation between parameters was analyzed using the Pearson correlation test. Values were considered different at p < 0.05. The most surprisingly result was the maintenance of low levels of IL6 in trained dogs after neutering, whereas the other two groups showed a significant increase of IL6. The consequences of training were evident in ethograms after adoption: there was an improvement of the interaction of dogs with the new family, attitudes of playing were more numerous, and dogs showed a greater receptivity to the new owners. The tail wagging, as communication behavior, appeared much more frequently in trained dogs after adoption. Abandoned dogs after adoption manifested more idleness, discouragement and depression behaviors and reduced alertness. These results suggest that the training reassures bitches in the stressful shelter environment, improves their physiological parameters, controls fear behaviors making them more able to adapt to the new environment after adoption. There were no differences in cortisol among the groups (p > 0.05). However, IL-6 concentration was lower in trained than in abandoned or owned dogs (p < 0.05). Concerning the ethotest, there was a negative correlation between IL6, sociability and trainability in all groups (r = -0.48 to -0.72; p <0.04) and only in relation to temper in abandoned dogs (r = - 0.72; p = 0.02). Upon adoption, there was a positive correlation between cortisol and trainability in trained dogs (r = 0.99, p < 0.0001). Training allowed greater learning and concentration and greater socialization of dogs after adoption. The increase in IL6 seems to impair this re-socialization. We suggest that cortisol contributes to the trainability and increases of IL6 denote lack of welfare.
3

Genetic control of Interleukin-6 gene

Terry, Catherine January 2000 (has links)
No description available.
4

Impacto da obesidade em camundongos Balb/c machos infectados com Trypanosoma cruzi e sua relação com aspectos imunológicos e histopatológicos

Arruda, Camila Maria de January 2019 (has links)
Orientador: Paulo Câmara Marques Pereira / Resumo: A Doença de Chagas, causada pelo Trypanosoma cruzi (T. cruzi), é uma patologia infecciosa crônica que apresenta grande incidência no Brasil e, nos últimos anos, passou a ser endêmica em centros urbanos. É acompanhada por alterações no sistema imune com variações nos níveis séricos das citocinas pró-inflamatórias. O tratamento disponível no Brasil é o benzonidazol, com baixa eficácia na fase crônica e efeitos colaterais importantes. Sabe-se que os adipocitos são reservatórios de T. cruzi, aspecto importante que é a relação com as citocinas pro-inflamatórias e com o aumento de T.cruzi nos adipocitos interferindo na evolução da doença. Sendo assim, o objetivo do presente estudo foi avaliar os efeitos da obesidade e das citocinas pro inflamatórias em camundongos balb/c machos infectados com T. cruzi tratados ou não com benzonidazol. Foram utilizados 120 animais, divididos em seis grupos, sendo 3 com dieta normal e 3 com dieta hipercalórica. Esses foram avaliados em cinco momentos: M1-1°dia, M2-3°dia, M3-5°dia, M4-7°dia e M5-8°dia. Para infecção utilizou a cepa aguda Y, com pico de parasitemia no sétimo dia (M4). A eutanásia foi realizada em cinco animais de cada grupo, em cada momento. Para determinação das citocinas utilizou o Kits de CBA –Cytometric Beads Array, através de citômetro de fluxo. Além disso, foi verificado o peso da gordura. O medicamento foi ofertado na dosagem de 100 mg/Kg/dia. A análise estatística foi realizada por medidas descritivas com o cálculo de média, de... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Chagas disease, caused by Trypanosoma cruzi (T. cruzi), is a chronic infectious disease that has a high incidence in Brazil and, in recent years, has become endemic in urban centers. It is accompanied by changes in the immune system with variations in serum levels of pro-inflammatory cytokines. The available treatment in Brazil is benzonidazole, with low efficacy in the chronic phase and important side effects. It is known that the adipocytes are reservoirs of T. cruzi, an important aspect that is the relation with the pro-inflammatory cytokines and with the increase of T. cruzi in the adipocytes interfering in the evolution of the disease. Therefore, the objective of the present study was to evaluate the effects of obesity and proinflammatory cytokines in T. cruzi infected or non-treated male balb / c mice with benzonidazole. A total of 120 animals were used, divided into six groups: 3 with normal diet and 3 with hypercaloric diet. These were evaluated in five moments: M1-1 day, M2-3 day, M3-5 day, M4-7 day and M5-8 day. For infection, the acute Y strain was used, with a peak of parasitemia on the seventh day (M4). Euthanasia was performed in five animals from each group, at each moment. In order to determine the cytokines, the CBA-Cytometric Beads Array Kits were used by flow cytometer. In addition, the fat weight was checked. The drug was offered in the dosage of 100 mg / kg / day. Statistical analysis was performed by descriptive measures with mean, standard deviation, mi... (Complete abstract click electronic access below) / Doutor
5

Regulation of Platelet-Activating Factor Acetylhydrolase by Oxidized Phospholipids and Proinflammatory Cytokines

Mukkamala, Muralikrishna 01 January 2008 (has links)
Platelet-Activating Factor Acetylhydrolase (PAFAH) is a monocyte-derived phospholipase A2 that catalyzes the hydrolysis of platelet-activating factor (PAF) and has been implicated in atherosclerosis. Although PAF and other proinflammatory stimuli are postulated to induce the enzyme, mechanisms controlling PAFAH expression are largely unknown at present. We have shown that PAFAH induction in monocytes is increased in response to oxidized phospholipids. The PAFAH 5' flanking region has at least 10 putative Stat elements, and IL-6 has been shown to be downstream from the prostaglandin receptor, EP2, which has been shown to bind oxidized phospholipids, prompting the hypothesis that Stat proteins might regulate its expression. To test this hypothesis, we treated human monocytes with IL-6, a monocyte-derived cytokine that activates Stat3, IL-8, a monocyte-derived cytokine induced by Stat3, and oxidized 1-palmitoyl-2-arachidonoyl-sn-3-phosphocholine (oxPAPC), a major component of the oxidized LDL particle. Two monocyte-derived cell types, macrophages (MO) and dendritic cells (DC) were prepared from primary human monocytes. The cells were treated with various doses of IL-6, IL-8, or oxPAPC for various time frames in the absence of serum. Culture supernatants from the cytokine-treated cells were harvested and screened for PAFAH protein and activity and cell monolayers were assessed for PAFAH mRNA by quantitative real time PCR (qPCR). Cells treated with oxPAPC were further analyzed for secreted IL-6 using ELISA and activation of Stat3 using Western Blot. Both IL-6 and IL-8 induced PAFAH expression in a dose-dependent manner. Although both MO and DC responded to the cytokines, preliminary experiments suggested that induction of PAFAH is more robust in DC than MO. Cytokine-treated cells exhibited increased PAFAH activity in their culture supernatants that correlated with increased PAFAH protein levels. Treatment with oxPAPC induced IL-6 secretion and subsequent Stat3 activation in DC. Together, these data support the hypothesis that PAFAH expression is regulated by oxidized phospholipids and proinflammatory cytokines in developing atheromas.
6

Relação entre dieta e polimorfismos dos genes IL6R e IL6 sobre marcadores biológicos do metabolismo

Bastian, Rafaela Mundstock de Azevedo 12 December 2013 (has links)
Submitted by FERNANDA DA SILVA VON PORSTER (fdsvporster@univates.br) on 2016-02-02T16:47:09Z No. of bitstreams: 3 license_text: 22064 bytes, checksum: ef48816a10f2d45f2e2fee2f478e2faf (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) 2013RafaelaMundstockdeAzevedoBastian.pdf: 749375 bytes, checksum: b76d59045d784f0c33faadd0accae511 (MD5) / Approved for entry into archive by Ana Paula Lisboa Monteiro (monteiro@univates.br) on 2016-02-03T16:52:14Z (GMT) No. of bitstreams: 3 license_text: 22064 bytes, checksum: ef48816a10f2d45f2e2fee2f478e2faf (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) 2013RafaelaMundstockdeAzevedoBastian.pdf: 749375 bytes, checksum: b76d59045d784f0c33faadd0accae511 (MD5) / Made available in DSpace on 2016-02-03T16:52:14Z (GMT). No. of bitstreams: 3 license_text: 22064 bytes, checksum: ef48816a10f2d45f2e2fee2f478e2faf (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) 2013RafaelaMundstockdeAzevedoBastian.pdf: 749375 bytes, checksum: b76d59045d784f0c33faadd0accae511 (MD5) / A obesidade é uma doença crônica de origem multifatorial que pode se desenvolver a partir de fatores comportamentais, metabólicos, psicológicos, e genéticos. A nutrigenética estuda os efeitos da variação genética na interação dieta-doença, o que inclui a identificação e caracterização dos genes relacionados ou até mesmo responsáveis pelas diferentes respostas aos nutrientes. Objetivo: Investigar a relação entre a dieta e os polimorfismos rs2228145 do gene IL6R e rs2069845 do gene IL6 sobre marcadores biológicos do metabolismo (parâmetros bioquímicos e antropométricos, através da técnica da PCR-Real Time. Metodologia: A amostra foi composta por indivíduos provenientes do Ambulatório de Nutrição do Universidade do Vale do Taquari Univates. O consumo alimentar foi avaliado através do recordatório 24 horas pelo software Dietwin 2008. A análise da composição corporal foi realizada através da avaliação antropométrica e do exame de bioimpedância. Foram dosados os parâmetros bioquímicos de glicemia, colesterol total, HDL e triglicerídeos, e calculada a fração LDL. As interações dos polimorfismos rs2228145 e rs2069845 entre o consumo de macro e micronutrientes para os desfechos dos parâmetros bioquímicos e antropométricos foram analisadas através do procedimento backward stepwise pelo software SPSS 19.0. Resultados: A amostra foi composta por um total de 344 indivíduos, dos quais 77% eram do gênero feminino e 23% do gênero masculino, com idade média de 25,8 anos (±6,9). Observaram-se associações entre dieta e o polimorfismo rs2228145 do gene IL6R para os desfechos de glicemia, HDL, IMC e circunferência da cintura. Já o polimorfismo rs2069845 do gene IL6 mostrou associação entre dieta para o desfecho de circunferência da cintura. Conclusão: Após a análise do consumo de macro e micronutrientes, dos parâmetros bioquímicos e antropométricos, juntamente com a análise molecular da amostra pode-se observar diversos efeitos e associações entre esses fatores e os polimorfismos. Essas associações dos polimorfismos com a dieta nos remete ao fato de que cada indivíduo é único e pode apresentar respostas dietéticas diferentes de acordo com seu genótipo. / Obesity is a chronic disease of multifactorial origin that can develop from behavioral, metabolic, psychological, and genetic factors. Nutrigenetic study the effects of genetic variation in diet-disease interaction, which includes the identification and characterization of the genes related or even responsible for the different responses to nutrients. Objective: To investigate the relationship between diet and the polymorphisms rs2228145 of the gene IL6R and rs2069845 of the gene IL6 on biochemical and anthropometric parameters, through the technique of Real - Time PCR. Methods: The sample consisted of individuals from the nutrition clinic of the University Center Univates. Dietary intake was assessed by the 24-hour recall by software Dietwin 2008. The body composition analysis was performed using anthropometric and bioimpedance exams. The biochemical parameters measured were blood glucose, total cholesterol, HDL and triglycerides and LDL calculated. The interactions of polymorphisms rs2228145 and rs2069845 between the consumption of macro and micronutrients for the outcomes of anthropometric and biochemical parameters were analyzed by backward stepwise procedure by SPSS 19.0 software. Results: The sample comprised a total of 344 individuals, of whom 77% were female and 23% male, with mean age of 25.8 years (± 6.9). Associations were observed between diet and the polymorphism rs2228145 of IL6R gene for glucose, HDL, BMI and waist circumference outcomes. The polymorphism rs2069845 of the IL6 gene showed an association between diet for the outcome of waist circumference. Conclusion: After analyzing the consumption of macro and micronutrients, biochemical and anthropometric parameters, together with the molecular analysis of the sample different effects and associations between these factors and polymorphisms can be observed. These associations relates to the fact that each individual is unique and may have different dietary responses according to their genotype
7

Novel mechanisms of Stat3 activation

Arulanandam, Rozanne 23 February 2010 (has links)
Stat3 (signal transducer and activator of transcription-3) is activated by a number of receptor and non-receptor tyrosine kinases, while a constitutively active form of Stat3 alone is sufficient to induce neoplastic transformation. Results presented in this thesis reveal that Stat3 can also be activated through homophilic interactions by the epithelial (E)-cadherin and cadherin-11, two members of the classical type I and II cadherin family of surface receptors, responsible for the formation of cell to cell junctions. Indeed, by plating cells onto surfaces coated with fragments encompassing the two outermost domains of these cadherins, we definitively demonstrate that cadherin engagement can activate Stat3, even in the absence of direct cell to cell contact. At the same time, levels of the extracellular signal regulated kinase (Erk)1/2, which is often coordinately activated by growth factor receptors and oncogenes, remain unchanged upon cadherin ligation. Most importantly, we report, for the first time, an unexpected surge in total Rac1 and Cdc42 protein levels, triggered by cadherin engagement, and an increase in Rac1 and Cdc42 activity, which is responsible for the Stat3 stimulation observed. Inhibition of cadherin interactions reduced Rac/Cdc42 and Stat3 levels and induced apoptosis, pointing to a significant role of this pathway in cell survival signalling, a finding which could also have important therapeutic implications. To better understand the role of Rac/Cdc42 in the cadherin-mediated Stat3 activation, we compared Stat3 activity in mouse HC11 cells before and after expression of the mutationally activated, RacV12. We demonstrate a dramatic increase in protein levels and activity of both the endogenous Rac and RacV12 with cell density, which was due to inhibition of proteasomal degradation. Moreover, we clearly show that RacV12 expression can activate Stat3 through an increase in expression of members of the IL6 family of cytokines, known potent Stat3 activators. In fact, knockdown experiments indicate that gp130 receptor function, and Stat3 activation, are essential for the migration and proliferation of RacV12-expressing cells, thereby demonstrating that the gp130/Stat3 axis represents an essential target of activated Rac in the regulation of both of these fundamental cellular functions. / Thesis (Ph.D, Pathology & Molecular Medicine) -- Queen's University, 2010-02-18 10:38:29.549
8

The Impact of Two Truncated STAT5B on Signaling Pathway and Human Growth

Gao, Wen 01 April 2021 (has links)
No description available.
9

The Functional Role of Hsp20 in the Heart

Gardner, George 02 October 2018 (has links)
No description available.
10

Einfluss von Interleukin 17 auf chondrogene Vorläuferzellen in der rheumatoiden Arthritis / Influences of interleukin 17 on chondrogenic progenitor cells in rheumatoid arthritis

Johannleweling, Jens 10 February 2014 (has links)
Die rheumatoide Arthritis ist eine chronisch entzündliche Gelenkentzündung, deren Ursachen bis dato ungeklärt bleibt. Der Verlauf der Erkrankung führt zu irreversiblem Zerstörung von Knorpel, Knochen und umgebenden Geweben in den betroffenen Gelenken. Es scheint jedoch klar, dass Synovialzellen, Knorpelzellen und Zytokine eine entscheidende Rolle im Fortschreiten der Erkrankung spielen. IL17 ist ein kürzlich entdecktes Zytokine, welches im besonderen Maßen mit der rheumatoiden Arthritis in Verbindung gebracht wird. Es liegt in der Synovialflüssigkeit und im Serum von Patienten mit rheumatoider Arthritis in deutlich höherer Konzentration vor als in anderen Gelenks-zerstörenden Erkrankungen wie z.B. der Osteoarthritis. Eine kürzlich entdeckte Zellpopulation konnte als chondrogene Vorläuferzellen charakterisiert werden. Da sie einen IL17-Rezeptorkomplex exprimieren, ist anzunehmen, dass eine IL17 Stimulation der chondrogenen Vorläuferzellen zu Veränderungen in deren Synthesemustern führt. Methode: Chondrogenen Vorläuferzellen konnten aus menschlichem Knorpel von Patientin mit rheumatoider Arthritis gewonnen und in Kultur gehalten werden. Die Zellen wurden mit IL17 inkubiert und deren Reaktion durch Zellkulturstudien, real-time-PCR, Immunfluoreszenz und western blot untersucht. Ergebnisse: Die IL17 Stimulation der chondrogenen Vorläuferzellen führte zu einer Suppression des Zellwachstums in den ersten Tagen der Zellkultur. Folgende mRNA Moleküle konnten erstmals in den chondrogenen Vorläuferzellen nachgewiesen werden: IL6, IL1,MMP3, MMP14,MMP15, MMP17 NFkB, , MAPK1, IL1, Aggrecan, ADAMTS-5 und TIMP3. Die IL17 Stimulation führte zu einer Erhöhung der Expression von MMP3, MMP17, IL6 und NFkB in den chondrogenen Vorläuferzellen. MMP14 und MMP15 zeigten sich nicht beeinflusst in ihrem Expressionsmuster. Anschließend konnten die Proteine MMP3 und IL6 stellvertretend in den chondrogenen Vorläuferzellen nachgewiesen werden. Ein IL17 Antikörper konnte den zuvor gezeigten Effekt von IL17 auf die IL6 Expression erfolgreich blocken. Schlussvolgerung: chondrogenen Vorläuferzellen scheinen in einem bestimmten Expressionsmuster auf die IL17 Stimulation zu reagieren. Gerade diese Reaktion scheint zum weiteren Fortschreiten der rheumatoiden Arthritis zu führen. Aufgrund der vielen bereits gezeigten Effekte von IL17 auf Gewebe in der rheumatoiden Arthritis scheint IL17 ein vielversprechendes Ziel in der zukünftigen Therapie der Erkrankung darzustellen.

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