E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isofo...
- Autores
- Pataccini, Gabriela; Lanari, Claudia; Giulianelli, Sebastian Jesus
- Año de publicación
- 2022
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Palbociclib (PALBO), a CDK 4/6 inhibitor, is currently used in combination with endocrine therapy targeting estrogen receptors to treat advanced luminal breast cancer. However, with time tumors become resistant to these treatments highlighting the need to develop other therapeutic strategies. Our laboratory focuses on the use of therapies targeting progesterone receptors (PR). We have previously shown that PALBO inhibits luminal breast cancer cell proliferation regardless of the prevailing PR isoform expressed and that mifepristone (MFP), an antiprogestin, potentiates this effect only in cells expressing PR isoform A (PRA). The aim of this study was to evaluate the role of two key cell cycle proteins, RB and E2F1 as mediators of this effect. T47D-YA or T47D-YB cells, expressing respectively PRA or PRB were treated with MFP, PALBO, or MFP+PALBO. The expression of E2F1 and pRB was evaluated by western blots. In agreement with data obtained in cell proliferation studies, a significant decrease of both protein levels (p<0.05) was observed only in T47D-YA cells treated with MFP+PALBO, whereas slight decreases were noted with single treatments. Contrarily, in T47D-YB cells, the effects of combined drugs were similar to those induced by PALBO. The in vivo growth of T47D cells expressing equimolar levels of PRA and PRB was also inhibited by the combined therapies and the strongest inhibition of pRB was registered by immunohistochemistry in tumors treated with both agents. Our results suggest that E2F1 and RB are key players mediating the inhibition of cell proliferation induced by PALBO and MFP combination exclusively in PRA-expressing cells. Mechanistic studies are underway to explore the direct involvement of PRA on the E2F1 promoter.
Fil: Pataccini, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Fil: Lanari, Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Fil: Giulianelli, Sebastian Jesus. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina
Reunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de Fisiología
Mar del Plata
Argentina
Sociedad Argentina de Investigación Clínica
Sociedad Argentina de Inmunología
Sociedad Argentina de Fisiología - Materia
-
PALBOCICLIB
BREAST CANCER
PROGESTERONE RECEPTOR
E2F RB - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/250344
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E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform APataccini, GabrielaLanari, ClaudiaGiulianelli, Sebastian JesusPALBOCICLIBBREAST CANCERPROGESTERONE RECEPTORE2F RBhttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3Palbociclib (PALBO), a CDK 4/6 inhibitor, is currently used in combination with endocrine therapy targeting estrogen receptors to treat advanced luminal breast cancer. However, with time tumors become resistant to these treatments highlighting the need to develop other therapeutic strategies. Our laboratory focuses on the use of therapies targeting progesterone receptors (PR). We have previously shown that PALBO inhibits luminal breast cancer cell proliferation regardless of the prevailing PR isoform expressed and that mifepristone (MFP), an antiprogestin, potentiates this effect only in cells expressing PR isoform A (PRA). The aim of this study was to evaluate the role of two key cell cycle proteins, RB and E2F1 as mediators of this effect. T47D-YA or T47D-YB cells, expressing respectively PRA or PRB were treated with MFP, PALBO, or MFP+PALBO. The expression of E2F1 and pRB was evaluated by western blots. In agreement with data obtained in cell proliferation studies, a significant decrease of both protein levels (p<0.05) was observed only in T47D-YA cells treated with MFP+PALBO, whereas slight decreases were noted with single treatments. Contrarily, in T47D-YB cells, the effects of combined drugs were similar to those induced by PALBO. The in vivo growth of T47D cells expressing equimolar levels of PRA and PRB was also inhibited by the combined therapies and the strongest inhibition of pRB was registered by immunohistochemistry in tumors treated with both agents. Our results suggest that E2F1 and RB are key players mediating the inhibition of cell proliferation induced by PALBO and MFP combination exclusively in PRA-expressing cells. Mechanistic studies are underway to explore the direct involvement of PRA on the E2F1 promoter.Fil: Pataccini, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Lanari, Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Giulianelli, Sebastian Jesus. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaReunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de FisiologíaMar del PlataArgentinaSociedad Argentina de Investigación ClínicaSociedad Argentina de InmunologíaSociedad Argentina de FisiologíaFundación Revista Medicina2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/250344E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A; Reunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de Fisiología; Mar del Plata; Argentina; 2022; 249-2490025-7680CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.medicinabuenosaires.com/indices-de-2020/volumen-82-ano-2022-s5/Nacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:43:37Zoai:ri.conicet.gov.ar:11336/250344instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:43:37.536CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
title |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
spellingShingle |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A Pataccini, Gabriela PALBOCICLIB BREAST CANCER PROGESTERONE RECEPTOR E2F RB |
title_short |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
title_full |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
title_fullStr |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
title_full_unstemmed |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
title_sort |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A |
dc.creator.none.fl_str_mv |
Pataccini, Gabriela Lanari, Claudia Giulianelli, Sebastian Jesus |
author |
Pataccini, Gabriela |
author_facet |
Pataccini, Gabriela Lanari, Claudia Giulianelli, Sebastian Jesus |
author_role |
author |
author2 |
Lanari, Claudia Giulianelli, Sebastian Jesus |
author2_role |
author author |
dc.subject.none.fl_str_mv |
PALBOCICLIB BREAST CANCER PROGESTERONE RECEPTOR E2F RB |
topic |
PALBOCICLIB BREAST CANCER PROGESTERONE RECEPTOR E2F RB |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
dc.description.none.fl_txt_mv |
Palbociclib (PALBO), a CDK 4/6 inhibitor, is currently used in combination with endocrine therapy targeting estrogen receptors to treat advanced luminal breast cancer. However, with time tumors become resistant to these treatments highlighting the need to develop other therapeutic strategies. Our laboratory focuses on the use of therapies targeting progesterone receptors (PR). We have previously shown that PALBO inhibits luminal breast cancer cell proliferation regardless of the prevailing PR isoform expressed and that mifepristone (MFP), an antiprogestin, potentiates this effect only in cells expressing PR isoform A (PRA). The aim of this study was to evaluate the role of two key cell cycle proteins, RB and E2F1 as mediators of this effect. T47D-YA or T47D-YB cells, expressing respectively PRA or PRB were treated with MFP, PALBO, or MFP+PALBO. The expression of E2F1 and pRB was evaluated by western blots. In agreement with data obtained in cell proliferation studies, a significant decrease of both protein levels (p<0.05) was observed only in T47D-YA cells treated with MFP+PALBO, whereas slight decreases were noted with single treatments. Contrarily, in T47D-YB cells, the effects of combined drugs were similar to those induced by PALBO. The in vivo growth of T47D cells expressing equimolar levels of PRA and PRB was also inhibited by the combined therapies and the strongest inhibition of pRB was registered by immunohistochemistry in tumors treated with both agents. Our results suggest that E2F1 and RB are key players mediating the inhibition of cell proliferation induced by PALBO and MFP combination exclusively in PRA-expressing cells. Mechanistic studies are underway to explore the direct involvement of PRA on the E2F1 promoter. Fil: Pataccini, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Fil: Lanari, Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Fil: Giulianelli, Sebastian Jesus. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; Argentina Reunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de Fisiología Mar del Plata Argentina Sociedad Argentina de Investigación Clínica Sociedad Argentina de Inmunología Sociedad Argentina de Fisiología |
description |
Palbociclib (PALBO), a CDK 4/6 inhibitor, is currently used in combination with endocrine therapy targeting estrogen receptors to treat advanced luminal breast cancer. However, with time tumors become resistant to these treatments highlighting the need to develop other therapeutic strategies. Our laboratory focuses on the use of therapies targeting progesterone receptors (PR). We have previously shown that PALBO inhibits luminal breast cancer cell proliferation regardless of the prevailing PR isoform expressed and that mifepristone (MFP), an antiprogestin, potentiates this effect only in cells expressing PR isoform A (PRA). The aim of this study was to evaluate the role of two key cell cycle proteins, RB and E2F1 as mediators of this effect. T47D-YA or T47D-YB cells, expressing respectively PRA or PRB were treated with MFP, PALBO, or MFP+PALBO. The expression of E2F1 and pRB was evaluated by western blots. In agreement with data obtained in cell proliferation studies, a significant decrease of both protein levels (p<0.05) was observed only in T47D-YA cells treated with MFP+PALBO, whereas slight decreases were noted with single treatments. Contrarily, in T47D-YB cells, the effects of combined drugs were similar to those induced by PALBO. The in vivo growth of T47D cells expressing equimolar levels of PRA and PRB was also inhibited by the combined therapies and the strongest inhibition of pRB was registered by immunohistochemistry in tumors treated with both agents. Our results suggest that E2F1 and RB are key players mediating the inhibition of cell proliferation induced by PALBO and MFP combination exclusively in PRA-expressing cells. Mechanistic studies are underway to explore the direct involvement of PRA on the E2F1 promoter. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Reunión Journal http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/250344 E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A; Reunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de Fisiología; Mar del Plata; Argentina; 2022; 249-249 0025-7680 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/250344 |
identifier_str_mv |
E2f1 and RB are common mediators of the inhibitory effects prompted by the combination of Mifepristone and Palbociclib on breast cancer cells expressing progesterone receptor Isoform A; Reunión Conjunta SAIC SAI & FAIC SAFIS 2022; LXVII Reunión Anual de la Sociedad Argentina de Investigación Clínica; LXX Reunión Anual de la Sociedad Argentina de Inmunología; 3er Congreso Franco Argentino de Inmunología; Reunión Anual 2022 de la Sociedad Argentina de Fisiología; Mar del Plata; Argentina; 2022; 249-249 0025-7680 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.medicinabuenosaires.com/indices-de-2020/volumen-82-ano-2022-s5/ |
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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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Fundación Revista Medicina |
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Fundación Revista Medicina |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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