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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

Regulation of glucose transport system in Ehrlich ascites tumour cells.

January 1987 (has links)
by Lam Wai Pui. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1987. / Bibliography: leaves 146-170.
2

Effect of foods and drugs on Ehrlich ascites tumour.

January 1982 (has links)
by Tim-tak Kwok. / Bibliography: leaves 157-171 / Thesis (M.Phil.)--Chinese University of Hong Kong, 1982
3

Studies of growth and initial invasion of Ehrlich ascites tumour cells on chick chorioallantoic membrane.

January 1984 (has links)
Kwan Suet-ming. / Bibliography: leaves 75-94 / Thesis (M.Ph.)--Chinese University of Hong Kong, 1984
4

Modulation of glucose transport in ehrlich ascites tumor cells.

January 1984 (has links)
Leung Siu Wai. / Bibliography: leaves 135-150 / Thesis (M.Ph.)--Chinese University of Hong Kong, 1984
5

Production of tumour necrosis factor and its effects on Ehrlich ascites tumour cells.

January 1987 (has links)
by Chung-Pui Cheng. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1987. / Bibliography: leaves 142-163.
6

A Study on the biochemical effects of hyperthermia of tumour cells.

January 1992 (has links)
by Lui Chi Pang. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1992. / Includes bibliographical references (leaves 265-281). / Acknowledgements --- p.i / Abbreviations --- p.ii / Abstract --- p.iii / Table of contents --- p.vii / Introduction / Review of Literature --- p.2 / Chapter I. --- Cellular response of hyperthermia --- p.3 / Chapter A) --- Effects on macromolecules synthesis --- p.3 / Chapter B) --- Effects on glycolysis and respiration --- p.5 / Chapter C) --- "Effects on plasma membrane, intracellular ionic level and intracellular pH" --- p.6 / Chapter II. --- Physical aspects --- p.11 / Chapter A) --- Survival curves --- p.11 / Chapter B) --- Concept of thermal dose --- p.13 / Chapter III. --- Clinical thermal theraphy --- p.21 / Chapter A) --- Hyperthermia in vivo --- p.21 / Chapter B) --- Combination of hyperthermia and radiotheraphy --- p.29 / Chapter C) --- Combination of hyperthermia and chemotherapy --- p.37 / Chapter IV. --- Thermotolerance --- p.48 / Scope of study --- p.54 / Materials and Methods / Chapter I. --- Cytotoxicity tests of cells in vitro --- p.59 / Chapter II. --- Whole body hyperthermia on Ehrlich ascite tumour (EAT)-bearing mice --- p.63 / Chapter III. --- Combination of hyperthermia and drugs --- p.66 / Chapter IV. --- Measurement of intracellular pH --- p.68 / Chapter V. --- Assay for sialic acids in the plasma membrane --- p.72 / Chapter VI. --- Assays of nucleolar proteins --- p.76 / Chapter VII. --- Acetylation of nuclear proteins --- p.80 / Chapter VIII. --- Detection of 72-kD heat shock protein --- p.93 / Results and Discussion / Chapter I. --- Cytotoxicity of hyperthermia in vitro --- p.102 / Chapter II. --- Hyperthermia on EAT cells in vivo --- p.131 / Chapter III. --- Cytotoxicity of combination of hyperthermia and drugs --- p.148 / Chapter IV. --- Intracellular pH changes during hyperthermia --- p.162 / Chapter V. --- Modification of sialic acid level in plasma membrane --- p.180 / Chapter VI. --- Conformational changes of nucleolar proteins --- p.193 / Chapter VII. --- Hyperthermic effect on acetylation of nuclear proteins --- p.209 / Chapter VIII. --- Induction of 72-kD heat shock protein --- p.223 / General Discussion / Chapter A. --- Hyperthermic cytotoxicity --- p.249 / Chapter B. --- Effects on plasma membrane and control of intracellular pH --- p.253 / Chapter C. --- Effects on the nuclear proteins --- p.256 / Chapter D. --- Conclusion --- p.263 / Bibliography --- p.264
7

A study on the expression of glucose transporters in ehrlich ascites tumor and SC180 sarcoma. / CUHK electronic theses & dissertations collection

January 1998 (has links)
by Au Kwong Keung. / Thesis (Ph.D.)--chinese University of Hong Kong, 1998. / Includes bibliographical references (p. 212-227). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
8

Atividade anticancer e mecanismo de morte celular dos extratos brutos e frações de Anacardium humile St. Hill. (Anacardiaceae) e Pothomorphe umbellata (L.) Miquel (Piperaceae) / Anticancer activity and mechanism of cell death of crude extracts and fractions obtained from Anacardium humile St. Hill. (Anacardiaceae) and Pothomorphe umbellata (L.) Miquel (Piperaceae)

Sacoman, Juliana Lessa 26 February 2007 (has links)
Orientadores: João Ernesto de Carvalho, Mary Ann Foglio / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-08T07:39:16Z (GMT). No. of bitstreams: 1 Sacoman_JulianaLessa_M.pdf: 21702719 bytes, checksum: 1522ff705d917fd77eec5e23216a58ea (MD5) Previous issue date: 2007 / Resumo: Os primeiros registros históricos da humanidade já relatavam o uso.de plantas para tratamento de diversos males e, com o aprimoramento dos estudos e técnicas de purificação, isolamento e identificação dos princípios ativos, foi possível o desenvolvimento de medicamentos para utilização em diversas patologias, inclusive na quimioterapia do câncer. Este trabalho teve como objetivo avaliar a atividade anticâncer de duas espécies da flora brasileira, Anacardium humile St. Hil. e Pothomorphe umbellata (L.) Miquel, de uso medicinal popular. Os extratos brutos diclorometânico (EBD) e etanólico (EBE) das folhas dessas espécies foram avaliados em ensaio de citotoxicidade in vitro em cultura de células tumorais humanas. Como o EBD de P. umbellata apresentou o melhor perfil de atividade in vitro, foi selecionado para avaliação em modelo de câncer murino, o tumor ascítico de Ehrlich. Nesse modelo, esse extrato apresentou atividade anti-tumoral dose dependente e, com isso, a identificação dos princípios responsáveis por essa atividade tomou-se fundamental. Desse modo, o EBD foi submetido a diversos procedimentos cromatográficos, sendo as frações obtidas biomonitoradas pelo teste de citotoxicidade. Esse procedimento permitiu a identificação de duas frações com elevada potência e seletividade anticâncer, sendo que na primeira fração (A) foram identificados derivados do ácido oxálico e na segunda (C), esteróides e triterpenos. A indução de morte celular por apoptose, avaliada por imunocitoquímica, foi significativa nas células UACC-62, OVCAR-3 e NCIADR/ RES quando tratadas pela fração A e nas células UACC-62, OVCAR-3 e 786-0, quando tratadas pela fração C. Uma outra fração (B), constituída principalmente do composto 4-nerolidilcatecol, não apresentou atividade anticâncer significativa. Esses resultados estimulam a continuidade dos estudos com a P. umbellata, com o objetivo de identificar os princípios ativos, determinar o mecanismo de ação anticâncer e comprovar sua atividade em modelos experimentais de câncer in vivo / Abstract: Plants are used in folk medicine since old times of human history, and improvements in techonology, research, purification techniques, isolation and identification of active principIes have allowed the discovery and development of new molecules as drugs for terapheutics of many diseases, such as cancer. This work aimed the evaluation of the anticancer activity of two Brazilian species, Anacardium humile St. Hil. and Pothomorphe umbellata (L.) Miquel, used in folk medicine. Dichlorometanic (DCE) and ethanolic (ECE) crude extracts obtained from leaves of both species were tested in an in vitro citotoxicity assay against human cancer celllines. As long as P. umbellata's DCE showed the best anticancer activity profile, it was also evaluated in a murine cancer model, the Ehrlich Ascite Tumor (EAT). In this experiment, DCE also demonstrated a dose response relationship anticancer activity; therefore the isolation and identification of the active principIe responsible for that activity became the major focus of this work. As a result, DCE was submitted to many cromatographic procedures which were bioguided by the anticancer assay in vitro. This chromatographic purifications permitted identification of two main fractions with high potency and selectivity: fraction A consitituted by oxalic acid derivatives, and fraction C by steroids and triterpenes. The quantification of apoptosis induction by immuncytochemical analysis were significant for UACC-62, OVCAR-3 and NCI-ADR/ RES celllines treated with fraction A, whereas UACC-62, OVCAR-3 and 786- o cells lines went to apoptosis when exposed to fraction C. A third fraction, denominated fraction B, was rich in 4-nerolidylcathecol, widely knowm for this plant specie, and did not show any significative anticancer activity. These results encouraged following up on studies with P. umbellata, priorizing the identification of active principIes, the determination of anticancer mechanism of action and to prove the anticancer activity in experimental cancer models in vivo / Mestrado / Biologia Celular / Mestre em Biologia Celular e Estrutural
9

Atividade anticancer do extratos brutos e das frações ativas obtidos de Piper regnellii (Miq.) C. DC. var. regnellii / Anticancer activity of crude extracts and active fractions obtained from Piper regnellii (Miq.) C. DC. var. regnellii

Longato, Giovanna Barbarini, 1985- 16 August 2018 (has links)
Orientadores: João Ernesto de Carvalho, Mary Ann Foglio / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-16T06:52:37Z (GMT). No. of bitstreams: 1 Longato_GiovannaBarbarini_M.pdf: 3207604 bytes, checksum: 101ab74753d736c58751655cdb930feb (MD5) Previous issue date: 2010 / Resumo: O câncer é um conjunto de doenças que atinge milhões de pessoas, sendo a segunda causa de morte da população mundial. Caracteriza-se pelo desenvolvimento de células instáveis que passam a não responder aos estímulos internos e externos que controlam a proliferação, diferenciação e morte celular. Apesar da grande quantidade de estudos relacionados ao gênero Piper e suas espécies, não há descrição sobre a atividade antiproliferativa in vitro e antitumoral in vivo da espécie P. regnellii (Miq.) C. DC. var. regnellii. O presente estudo avaliou a atividade antiproliferativa in vitro desta espécie, coletada em três épocas diferentes: junho e outubro de 2008 e fevereiro de 2009. Dentre as coletas realizadas, o extrato bruto diclorometânico de junho e suas frações de média polaridade apresentaram atividade citotóxica in vitro com boa correlação entre concentração e efeito e também seletividade para as linhagens hormônio-dependentes de ovário (OVCAR-3) e mama (MCF7), bem como para as linhagens de melanoma (UACC- 62) e próstata (PC-3). De acordo com os nossos estudos, uma das substâncias responsáveis por esta atividade é uma neolignana denominada eupomatenóide-5. Os efeitos observados in vitro pela fração rica em lignanas foram comprovados em modelo in vivo de tumor sólido de Ehrlich. Além disso, o extrato bruto diclorometânico de P. regnellii reduziu o edema de pata produzido por carragenina sugerindo uma correlação entre câncer e inflamação. Este é o primeiro trabalho que relata o efeito antiproliferativo e antiinflamatório de P. regnellii e os resultados obtidos incentivam a continuação dos estudos visando a elucidação do mecanismo de ação e identificando outros princípios ativos que, em sinergismo com o composto eupomatenóide-5, potencializem a atividade de P. regnellii. / Abstract: Cancer is a pool of many diseases diagnosed in thousands of people all over the world and represents the second major cause of death worldwide. The loss of normal cell growth control is the main event in the development of cancer and includes specific steps known as cell proliferation, differentiation and apoptosis. Despite numerous studies related to Piper genus, there is no description of any antiproliferative (in vitro) or antitumoral activity (in vivo) of Piper regnellii (Miq.) C. DC. var. regnellii. The present study evaluated the antiproliferative activity of this species, collected in three different periods: June and October, 2008 and February 2009. Among the plants evaluated, the medium polarity fractions obtained from the dichloromethanic crude extract of the plants collected in June presented concentration-effect correlation and also selectivity towards hormonedependent ovary (OVCAR-3) and breast (MCF7) cell lines, as well as melanoma (UACC- 62) and prostate (PC-3). According to our studies, one of the compounds responsible for this activity is classified as eupomatenoid-5, that is a neolignan. Effects observed in vitro for the lignans enriched fractions were confirmed through the Ehrlich solid tumor model in mice. In addition, preliminary results with dichloromethane crude extract of P. regnellii in anti-inflammatory experimental model of paw edema induced by carrageenan suggest the connection between cancer and inflammation. The present study represents the first report of both antiproliferative and anti-inflammatory promising activities of this species indicating the benefits of further studies in the search of more purified compounds and active principles that in synergism with eupomatenoid-5 can potentiate anticancer activity's result, as well as their mechanisms of action. / Mestrado / Biologia Celular / Mestre em Biologia Celular e Estrutural
10

Avaliação das atividades farmacológicas dos extratos brutos de Astronium fraxinifolium Schott. (Anacardiaceae) / Evaluation of the pharmacological activity of crude extracts of Astronium fraxinifolium Schott. (Anacardiaceae)

Zafred, Rafael Rosolen Teixeira, 1987- 08 January 2014 (has links)
Orientador: João Ernesto de Carvalho / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-25T17:18:09Z (GMT). No. of bitstreams: 1 Zafred_RafaelRosolenTeixeira_M.pdf: 2402931 bytes, checksum: 1695b8ad500015e973737d3b719cde53 (MD5) Previous issue date: 2014 / Resumo: Astronium fraxinifolium Schott., conhecido popularmente como "Gonçalo Alves", é uma espécie vegetal característica de regiões tropicais e tem sua distribuição no Cerrado Brasileiro, possui o caule e as folhas ricos em substâncias tânicas. Relatados populares indicam a utilização de A. fraxinifolium no tratamento de diarreias, disenterias, anti-séptico, anti-microbiano, antihemorrágico, cicatrizante, anti-inflamatório e antiulcerogênico. Devido o uso popular e a insuficiência de dados na literatura, este trabalho teve por objetivo avaliar as potenciais atividades farmacológicas desta espécie em modelos experimentais in vitro (atividade antiproliferativa em cultura de células) e in vivo (toxicidade aguda, modelos de nocicepção, inflamação e tumor sólido murino) O material vegetal (cascas do caule e folhas) obtido das coletas foram secos e triturados, o pó obtido foi utilizado para obtenção dos extratos por maceração mecânica e sistema Soxhlet. Estes foram avaliados conforme seu rendimento e demonstraram a presença de taninos hidrolisáveis, como compostos majoritários, e flavonoides. No teste realizado em cultura de células tumorais e não tumorais de diferentes origens os extratos apresentaram, em sua maioria, uma ação citostática na maior concentração testada (250µg/mL). Por outro lado, nos testes relacionados com atividade antinociceptiva extrato bruto das folhas demonstrou atividade nas doses de 100 e 200mg/Kg no modelo da formalina em ambas as fases. Nos modelos inflamatórios (úlcera induzida por indometacina, edema de pata induzido por carragenina e edema de orelha induzido por óleo de cróton) as doses de 100 e 200mg/Kg, no modelo de edema de pata induzido por carragenina, e as doses de 150 e 300mg/Kg, no modelo de edema de orelha induzido por óleo de cróton, demonstraram atividade anti-inflamatória. Considerando que aproximadamente 25% dos tumores estão relacionados com inflamações crônicas, o extrato das folhas de A. fraxinifolium foi avaliado no modelo experimental do tumor sólido de Ehrlich no flanco, demonstrando inibição do crescimento tumoral na dose de 100mg/Kg. Sendo assim, os resultados experimentais sugerem que a espécie A. fraxinifolium possui atividade antiinflamatória dos componentes do extrato bruto, corroborando com sua utilização popular. Além de promover inibição do crescimento tumoral indicando que os componentes do extrato podem atuar em outros processos além do inflamatório. Porém, outros estudos necessitam ser realizados para identificar a classe de compostos que promoveram as atividades farmacológicas da espécie / Abstract: Astronium fraxinifolium Schott., popularly known as "Gonçalo Alves", is a species characteristic of tropical regions with their distribution in the Brazilian Cerrado, has stems and leaves rich in tannic substances. Reported the use of folk medicinal indicate A. fraxinifolium in the treatment of diarrhea, dysentery, antiseptic, anti-microbial, antihaemorrhagic, wound healing, anti-inflammatory and antiulcerogenic. Due to popular use and insufficient data in the literature, this study aimed to evaluate potential pharmacological activities of this species in vitro experimental models (antiproliferative activity in cell culture) and in vivo (acute toxicity models of nociception, inflammation and tumor solid murine) The plant material (stems and leaves) samples were obtained from dried and crushed, the powder obtained was used to obtain the extracts, mechanical maceration and soxhlet system. These were evaluated according to their yield and showed the presence of hydrolyzable tannins, as main compounds, and flavonoids. Testing conducted on cultured tumor and non-tumor cells of different origins, the extracts showed mostly a cytostatic action at the highest concentration tested (250?g/mL). Moreover, in tests related antinociceptive crude extract of the leaves showed activity at doses of 100 and 200mg/Kg in the formalin model in both phases. In inflammatory models (indomethacin-induced ulcer, paw edema induced by carrageenan and ear edema induced by croton oil) doses of 100 and 200mg/Kg in paw edema induced by carrageenan model, and the doses of 150 and 300mg/kg, in the ear edema induced by croton oil model, demonstrated anti-inflammatory activity. Considering that approximately 25% of tumors are associated with chronic inflammation, the extract of A. fraxinifolium was assessed in the experimental model of Ehrlich solid tumor in the flank, demonstrating inhibition of tumor growth at a dose of 100mg/kg. Thus, experimental results suggest that the species A. fraxinifolium has anti-inflammatory component of the crude extract activity, confirming its popular use. In addition to promoting tumor growth inhibition indicating that extract components can act in addition to other inflammatory processes. However, other studies should be performed to identify the class of compounds that promoted the pharmacological activity of the species / Mestrado / Fármacos, Medicamentos e Insumos para Saúde / Mestre em Biociências e Tecnologia de Produtos Bioativos

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