Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/61274 |
Resumo: | Rac1b, an alternative isoform of the small GTPase RAC1, has recently be shown to be present in thyroid tissue and overexpressed in thyroid cancer cells, particularly in a subset of papillary thyroid carcinomas carrying the activating mutation BRAFV600E that are associated with an unfavorable outcome. On the other hand, RAC1 seems to be involved in the upregulation of NIS, the glycoprotein responsible for iodide uptake that allows the use of 131 I as a diagnostic and therapeutic tool, in thyroid cancer. However, NIS expression levels and iodine uptake in thyroid cancer cells are reduced when compared to normal tissue. Also, B-Raf V600E mutation has been shown to correlate with a lower expression of NIS. RAC1b overexpression has also been documented in breast cancer. This hyperactivatable variant was shown to be able to compete with and inhibit RAC1 endogenous activity in several signaling pathways. Breast carcinomas also express NIS but at levels too low to warrant treatment with 131I. Thus, in order to understand the regulatory mechanisms of NIS expression we aimed to evaluate the balance of RAC1/1b effect in NIS mRNA expression in follicular cell derived thyroid tumor samples, as well as, in a cell line derived from normal thyroid and in breast cancer cell lines. Understanding the necessary switch to increase NIS expression in cancer cells, would open a new window of opportunity to fight thyroid tumor resistance to radioiodine therapy and develop and possible treatment by the radiodide uptake therapy in breast cancer in a selective way. |
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Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancersRAC1bSodium Iodide SymporterThyroid: BreastCancerDomínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e TecnologiasRac1b, an alternative isoform of the small GTPase RAC1, has recently be shown to be present in thyroid tissue and overexpressed in thyroid cancer cells, particularly in a subset of papillary thyroid carcinomas carrying the activating mutation BRAFV600E that are associated with an unfavorable outcome. On the other hand, RAC1 seems to be involved in the upregulation of NIS, the glycoprotein responsible for iodide uptake that allows the use of 131 I as a diagnostic and therapeutic tool, in thyroid cancer. However, NIS expression levels and iodine uptake in thyroid cancer cells are reduced when compared to normal tissue. Also, B-Raf V600E mutation has been shown to correlate with a lower expression of NIS. RAC1b overexpression has also been documented in breast cancer. This hyperactivatable variant was shown to be able to compete with and inhibit RAC1 endogenous activity in several signaling pathways. Breast carcinomas also express NIS but at levels too low to warrant treatment with 131I. Thus, in order to understand the regulatory mechanisms of NIS expression we aimed to evaluate the balance of RAC1/1b effect in NIS mRNA expression in follicular cell derived thyroid tumor samples, as well as, in a cell line derived from normal thyroid and in breast cancer cell lines. Understanding the necessary switch to increase NIS expression in cancer cells, would open a new window of opportunity to fight thyroid tumor resistance to radioiodine therapy and develop and possible treatment by the radiodide uptake therapy in breast cancer in a selective way.Silva, AnaRUNCapinha, Liliana Mónica Santos2019-02-22T14:34:30Z2015-0920152015-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/61274enginfo: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:RCAAP2024-03-11T04:29:09Zoai:run.unl.pt:10362/61274Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:33:36.737686Repositório 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 |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
title |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
spellingShingle |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers Capinha, Liliana Mónica Santos RAC1b Sodium Iodide Symporter Thyroid: Breast Cancer Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias |
title_short |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
title_full |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
title_fullStr |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
title_full_unstemmed |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
title_sort |
Interplay between Rac1b and Sodium Iodide symporter expression in thyroid and breast cancers |
author |
Capinha, Liliana Mónica Santos |
author_facet |
Capinha, Liliana Mónica Santos |
author_role |
author |
dc.contributor.none.fl_str_mv |
Silva, Ana RUN |
dc.contributor.author.fl_str_mv |
Capinha, Liliana Mónica Santos |
dc.subject.por.fl_str_mv |
RAC1b Sodium Iodide Symporter Thyroid: Breast Cancer Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias |
topic |
RAC1b Sodium Iodide Symporter Thyroid: Breast Cancer Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias |
description |
Rac1b, an alternative isoform of the small GTPase RAC1, has recently be shown to be present in thyroid tissue and overexpressed in thyroid cancer cells, particularly in a subset of papillary thyroid carcinomas carrying the activating mutation BRAFV600E that are associated with an unfavorable outcome. On the other hand, RAC1 seems to be involved in the upregulation of NIS, the glycoprotein responsible for iodide uptake that allows the use of 131 I as a diagnostic and therapeutic tool, in thyroid cancer. However, NIS expression levels and iodine uptake in thyroid cancer cells are reduced when compared to normal tissue. Also, B-Raf V600E mutation has been shown to correlate with a lower expression of NIS. RAC1b overexpression has also been documented in breast cancer. This hyperactivatable variant was shown to be able to compete with and inhibit RAC1 endogenous activity in several signaling pathways. Breast carcinomas also express NIS but at levels too low to warrant treatment with 131I. Thus, in order to understand the regulatory mechanisms of NIS expression we aimed to evaluate the balance of RAC1/1b effect in NIS mRNA expression in follicular cell derived thyroid tumor samples, as well as, in a cell line derived from normal thyroid and in breast cancer cell lines. Understanding the necessary switch to increase NIS expression in cancer cells, would open a new window of opportunity to fight thyroid tumor resistance to radioiodine therapy and develop and possible treatment by the radiodide uptake therapy in breast cancer in a selective way. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09 2015 2015-09-01T00:00:00Z 2019-02-22T14:34:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/61274 |
url |
http://hdl.handle.net/10362/61274 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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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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1799137958206373888 |