The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/6691 |
Resumo: | The last years have witnessed the emergence of metabolic reprogramming as a hallmark of cancer. The changes in cancer cell metabolism include, among others, a shift in glucose metabolism from oxidative phosphorylation to aerobic glycolysis, which culminates in an increased lactate production and acidification of microenvironment favoring tumor progression. We and others previous work have shown that steroid hormones play a relevant role driven the metabolic changes associated with development and progression of prostate cancer. Nevertheless, the panoply of metabolic (de)regulators linked with prostate cancer remains poorly known. Endocrine-disrupting chemicals are a group of compounds that interfere with the synthesis, secretion, and metabolism of natural hormones, which have also been implicated in carcinogenesis. Methoxychlor (MXC) is a chlorinated pesticide widely dispersed in the environment by its use in agricultural activities, and several reports have demonstrated its estrogenic properties. However, the MXC effects inducing metabolic alterations in prostate cells are largely unknown. This study aimed to analyze the effect of MXC on cell viability, apoptosis and glycolytic metabolism of neoplastic (LNCaP and PC3) and non-neoplastic (PNT1A) human prostate cells. For this purpose, LNCaP, PC3, and PNT1A cells were cultured in the presence or absence of a range of MXC concentrations (0, 0.1, 1, 10 and 100 µM) for 48 and 72 hours. MTT assays performed for all experimental conditions demonstrated that MXC diminished the viability of both neoplastic and non-neoplastic prostate cells in a time- and concentration-dependent manner. The 100 µM concentration and a treatment period of 48 hours were the conditions selected for evaluation of the effect of MXC on apoptosis and glycolytic metabolism of all cell lines under study. Protein expression and activity of target modulators of these biological processes were assessed by means of Western blot analysis and biochemical assays. The obtained results showed that MXC-treatment decreased the apoptotic rate of PNT1A cells, despite the observed decrease in cell proliferation. Curiously, in LNCaP- and PC3-treated cells MXC had an opposite effect increasing caspase-3 activity, the effector protein of apoptosis, and up-regulating the expression of apoptotic regulators. Regarding metabolism, measurement of glucose and lactate levels by spectrophotometric assays showed that MXC stimulated the glycolytic flux in both non-neoplastic and neoplastic human prostate cell lines, as indicated by the enhanced glucose consumption and lactate production. This metabolic response was underpinned by the increased expression of glucose transporters and activity of glycolytic enzymes. The present findings demonstrated that MXC may have a role in the development and progression of prostate cancer by suppressing apoptosis in non-neoplastic prostate epithelial cells and stimulating the glycolytic pathway in both non-neoplastic and neoplastic cells. Moreover, the evidence gathered herein highlights for the impact of MXC in other human diseases, such as diabetes, obesity, and infertility, since they are all associated with alterations in apoptosis and metabolism also. |
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The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlorApoptoseCancro da PróstataLncapMetabolismo GlicolíticoMetoxicloroPc3Pnt1aDomínio/Área Científica::Ciências Médicas::Ciências BiomédicasThe last years have witnessed the emergence of metabolic reprogramming as a hallmark of cancer. The changes in cancer cell metabolism include, among others, a shift in glucose metabolism from oxidative phosphorylation to aerobic glycolysis, which culminates in an increased lactate production and acidification of microenvironment favoring tumor progression. We and others previous work have shown that steroid hormones play a relevant role driven the metabolic changes associated with development and progression of prostate cancer. Nevertheless, the panoply of metabolic (de)regulators linked with prostate cancer remains poorly known. Endocrine-disrupting chemicals are a group of compounds that interfere with the synthesis, secretion, and metabolism of natural hormones, which have also been implicated in carcinogenesis. Methoxychlor (MXC) is a chlorinated pesticide widely dispersed in the environment by its use in agricultural activities, and several reports have demonstrated its estrogenic properties. However, the MXC effects inducing metabolic alterations in prostate cells are largely unknown. This study aimed to analyze the effect of MXC on cell viability, apoptosis and glycolytic metabolism of neoplastic (LNCaP and PC3) and non-neoplastic (PNT1A) human prostate cells. For this purpose, LNCaP, PC3, and PNT1A cells were cultured in the presence or absence of a range of MXC concentrations (0, 0.1, 1, 10 and 100 µM) for 48 and 72 hours. MTT assays performed for all experimental conditions demonstrated that MXC diminished the viability of both neoplastic and non-neoplastic prostate cells in a time- and concentration-dependent manner. The 100 µM concentration and a treatment period of 48 hours were the conditions selected for evaluation of the effect of MXC on apoptosis and glycolytic metabolism of all cell lines under study. Protein expression and activity of target modulators of these biological processes were assessed by means of Western blot analysis and biochemical assays. The obtained results showed that MXC-treatment decreased the apoptotic rate of PNT1A cells, despite the observed decrease in cell proliferation. Curiously, in LNCaP- and PC3-treated cells MXC had an opposite effect increasing caspase-3 activity, the effector protein of apoptosis, and up-regulating the expression of apoptotic regulators. Regarding metabolism, measurement of glucose and lactate levels by spectrophotometric assays showed that MXC stimulated the glycolytic flux in both non-neoplastic and neoplastic human prostate cell lines, as indicated by the enhanced glucose consumption and lactate production. This metabolic response was underpinned by the increased expression of glucose transporters and activity of glycolytic enzymes. The present findings demonstrated that MXC may have a role in the development and progression of prostate cancer by suppressing apoptosis in non-neoplastic prostate epithelial cells and stimulating the glycolytic pathway in both non-neoplastic and neoplastic cells. Moreover, the evidence gathered herein highlights for the impact of MXC in other human diseases, such as diabetes, obesity, and infertility, since they are all associated with alterations in apoptosis and metabolism also.A capacidade de reprogramação metabólica apresentada pelas células tumorais tem emergido, nos últimos anos, como um dos “Hallmarks” do cancro. As alterações metabólicas típicas das células cancerígenas caracterizam-se essencialmente pela utilização da via glicolítica anaeróbia em detrimento da fosforilação oxidativa, o que culmina no aumento da produção de lactato, e na, consequente, acidificação do microambiente tumoral, o que favorece a progressão do cancro. Estudos anteriores do nosso grupo de investigação e outros demonstraram que as hormonas esteróides desempenham um papel relevante no estabelecimento das alterações metabólicas associadas ao desenvolvimento e progressão do cancro da próstata. Contudo, a panóplia completa dos potenciais (des)reguladores metabólicos relacionados com o cancro da próstata é ainda desconhecida. Os disruptores endócrinos são um grupo de compostos que interfere na síntese, secreção e metabolismo das hormonas naturais, os quais têm igualmente sido implicados na carcinogénese. O metoxicloro (MXC) é um pesticida organoclorado largamente disseminado no ambiente através do seu uso na atividade agrícola, tendo vários estudos demonstrado as suas propriedades estrogénicas. No entanto, os efeitos do MXC na indução de alterações metabólicas em células da próstata são totalmente desconhecidos. A presente dissertação tem como objetivo analisar o efeito do MXC na viabilidade celular, apoptose e metabolismo glicolítico de células da próstata humana, neoplásicas (LNCaP e PC3) e não neoplásicas (PNT1A). Com este propósito, as células LNCaP, PC3 e PNT1A foram mantidas em cultura na presença ou ausência de MXC (0, 0.1, 1, 10 and 100 µM) durante 48 e 72 horas. Os ensaios de (3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide) (MTT) realizados para todas as condições experimentais demonstraram que o MXC diminui a viabilidade das células da próstata neoplásicas, assim como das não neoplásicas, e de uma forma dependente do tempo de exposição e da concentração. A concentração de 100 µM e o tempo de tratamento de 48 horas foram as condições selecionadas para avaliação dos efeitos do MXC na apoptose e no metabolismo glicolítico de todas as linhas celulares em estudo. A expressão proteica e a atividade de moduladores alvo destes processos foram analisadas por Western Blot e ensaios bioquímicos. Os resultados obtidos revelaram que o tratamento com MXC diminuiu a taxa de apoptose das células PNT1A, apesar da diminuição da proliferação celular observada. Curiosamente, nas células LNCaP e PC3 tratadas com MXC verificou-se o oposto, ou seja, o aumento da atividade da caspase-3, a proteína efetora da apoptose, bem como da expressão de reguladores apoptóticos. No que diz respeito ao metabolismo, a medição dos níveis de glicose e de lactato por ensaios espectrofotométricos mostrou que o MXC estimulou o fluxo glicolítico quer nas linhas celulares de próstata neoplásicas quer nas não neoplásicas, como indicado pelos aumentos observados no consumo de glicose e na produção de lactato. Esta resposta metabólica foi suportada pelo aumento da expressão dos transportadores de glicose e pela atividade de enzimas glicolíticas. Os resultados obtidos demonstram que o MXC pode ter um papel no desenvolvimento e na progressão do cancro da próstata, suprimindo a apoptose nas células epiteliais de próstata não neoplásicas e estimulando a via glicolítica quer nas células não neoplásicas quer nas neoplásicas. Para além disso, estas evidências alertam para o impacto que o MXC também pode ter noutras doenças igualmente associadas a alterações na apoptose e metabolismo, como, por exemplo, a diabetes, a obesidade e a infertilidade.Socorro, Sílvia Cristina da Cruz MarquesVaz, Cátia Alexandra VicenteuBibliorumCarvalho, Tiago Miguel Amaral2019-01-04T17:05:54Z2017-10-262017-10-22017-10-26T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.6/6691TID:202107663enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-15T09:45:24Zoai:ubibliorum.ubi.pt:10400.6/6691Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:47:21.520153Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
title |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
spellingShingle |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor Carvalho, Tiago Miguel Amaral Apoptose Cancro da Próstata Lncap Metabolismo Glicolítico Metoxicloro Pc3 Pnt1a Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
title_short |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
title_full |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
title_fullStr |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
title_full_unstemmed |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
title_sort |
The “ins and outs” of prostate metabolism towards carcinogenesis: the case of methoxychlor |
author |
Carvalho, Tiago Miguel Amaral |
author_facet |
Carvalho, Tiago Miguel Amaral |
author_role |
author |
dc.contributor.none.fl_str_mv |
Socorro, Sílvia Cristina da Cruz Marques Vaz, Cátia Alexandra Vicente uBibliorum |
dc.contributor.author.fl_str_mv |
Carvalho, Tiago Miguel Amaral |
dc.subject.por.fl_str_mv |
Apoptose Cancro da Próstata Lncap Metabolismo Glicolítico Metoxicloro Pc3 Pnt1a Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
topic |
Apoptose Cancro da Próstata Lncap Metabolismo Glicolítico Metoxicloro Pc3 Pnt1a Domínio/Área Científica::Ciências Médicas::Ciências Biomédicas |
description |
The last years have witnessed the emergence of metabolic reprogramming as a hallmark of cancer. The changes in cancer cell metabolism include, among others, a shift in glucose metabolism from oxidative phosphorylation to aerobic glycolysis, which culminates in an increased lactate production and acidification of microenvironment favoring tumor progression. We and others previous work have shown that steroid hormones play a relevant role driven the metabolic changes associated with development and progression of prostate cancer. Nevertheless, the panoply of metabolic (de)regulators linked with prostate cancer remains poorly known. Endocrine-disrupting chemicals are a group of compounds that interfere with the synthesis, secretion, and metabolism of natural hormones, which have also been implicated in carcinogenesis. Methoxychlor (MXC) is a chlorinated pesticide widely dispersed in the environment by its use in agricultural activities, and several reports have demonstrated its estrogenic properties. However, the MXC effects inducing metabolic alterations in prostate cells are largely unknown. This study aimed to analyze the effect of MXC on cell viability, apoptosis and glycolytic metabolism of neoplastic (LNCaP and PC3) and non-neoplastic (PNT1A) human prostate cells. For this purpose, LNCaP, PC3, and PNT1A cells were cultured in the presence or absence of a range of MXC concentrations (0, 0.1, 1, 10 and 100 µM) for 48 and 72 hours. MTT assays performed for all experimental conditions demonstrated that MXC diminished the viability of both neoplastic and non-neoplastic prostate cells in a time- and concentration-dependent manner. The 100 µM concentration and a treatment period of 48 hours were the conditions selected for evaluation of the effect of MXC on apoptosis and glycolytic metabolism of all cell lines under study. Protein expression and activity of target modulators of these biological processes were assessed by means of Western blot analysis and biochemical assays. The obtained results showed that MXC-treatment decreased the apoptotic rate of PNT1A cells, despite the observed decrease in cell proliferation. Curiously, in LNCaP- and PC3-treated cells MXC had an opposite effect increasing caspase-3 activity, the effector protein of apoptosis, and up-regulating the expression of apoptotic regulators. Regarding metabolism, measurement of glucose and lactate levels by spectrophotometric assays showed that MXC stimulated the glycolytic flux in both non-neoplastic and neoplastic human prostate cell lines, as indicated by the enhanced glucose consumption and lactate production. This metabolic response was underpinned by the increased expression of glucose transporters and activity of glycolytic enzymes. The present findings demonstrated that MXC may have a role in the development and progression of prostate cancer by suppressing apoptosis in non-neoplastic prostate epithelial cells and stimulating the glycolytic pathway in both non-neoplastic and neoplastic cells. Moreover, the evidence gathered herein highlights for the impact of MXC in other human diseases, such as diabetes, obesity, and infertility, since they are all associated with alterations in apoptosis and metabolism also. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-10-26 2017-10-2 2017-10-26T00:00:00Z 2019-01-04T17:05:54Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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http://hdl.handle.net/10400.6/6691 TID:202107663 |
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http://hdl.handle.net/10400.6/6691 |
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TID:202107663 |
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eng |
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eng |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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