Your browser doesn't support javascript.
loading
Expression of calcium pumps is differentially regulated by histone deacetylase inhibitors and estrogen receptor alpha in breast cancer cells.
Varga, Karolina; Hollósi, Anna; Pászty, Katalin; Hegedus, Luca; Szakács, Gergely; Tímár, József; Papp, Béla; Enyedi, Ágnes; Padányi, Rita.
Afiliação
  • Varga K; 2nd Department of Pathology, Semmelweis University, Budapest, Hungary.
  • Hollósi A; 2nd Department of Pathology, Semmelweis University, Budapest, Hungary.
  • Pászty K; Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary.
  • Hegedus L; Department of Thoracic Surgery, Ruhrlandklinik, University Clinic Essen, University Duisburg-Essen, Duisburg, Germany.
  • Szakács G; Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.
  • Tímár J; Institute of Cancer Research, Medical University Vienna, Vienna, Austria.
  • Papp B; 2nd Department of Pathology, Semmelweis University, Budapest, Hungary.
  • Enyedi Á; U978, Institut National de la Santé et de la Recherche Médicale, and Université Paris-13, PRES Sorbonne Paris-Cité, Bobigny, France.
  • Padányi R; 2nd Department of Pathology, Semmelweis University, Budapest, Hungary.
BMC Cancer ; 18(1): 1029, 2018 Oct 23.
Article em En | MEDLINE | ID: mdl-30352569
ABSTRACT

BACKGROUND:

Remodeling of Ca2+ signaling is an important step in cancer progression, and altered expression of members of the Ca2+ signaling toolkit including the plasma membrane Ca2+ ATPases (PMCA proteins encoded by ATP2B genes) is common in tumors.

METHODS:

In this study PMCAs were examined in breast cancer datasets and in a variety of breast cancer cell lines representing different subtypes. We investigated how estrogen receptor alpha (ER-α) and histone deacetylase (HDAC) inhibitors regulate the expression of these pumps.

RESULTS:

Three distinct datasets displayed significantly lower ATP2B4 mRNA expression in invasive breast cancer tissue samples compared to normal breast tissue, whereas the expression of ATP2B1 and ATP2B2 was not altered. Studying the protein expression profiles of Ca2+ pumps in a variety of breast cancer cell lines revealed low PMCA4b expression in the ER-α positive cells, and its marked upregulation upon HDAC inhibitor treatments. PMCA4b expression was also positively regulated by the ER-α pathway in MCF-7 cells that led to enhanced Ca2+ extrusion capacity in response to 17ß-estradiol (E2) treatment. E2-induced PMCA4b expression was further augmented by HDAC inhibitors. Surprisingly, E2 did not affect the expression of PMCA4b in other ER-α positive cells ZR-75-1, T-47D and BT-474. These findings were in good accordance with ChIP-seq data analysis that revealed an ER-α binding site in the ATP2B4 gene in MCF-7 cells but not in other ER-α positive tumor cells. In the triple negative cells PMCA4b expression was relatively high, and the effect of HDAC inhibitor treatment was less pronounced as compared to that of the ER-α positive cells. Although, the expression of PMCA4b was relatively high in the triple negative cells, a fraction of the protein was found in intracellular compartments that could interfere with the cellular function of the protein.

CONCLUSIONS:

Our results suggest that the expression of Ca2+ pumps is highly regulated in breast cancer cells in a subtype specific manner. Our results suggest that hormonal imbalances, epigenetic modifications and impaired protein trafficking could interfere with the expression and cellular function of PMCA4b in the course of breast cancer progression.
Assuntos
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Neoplasias da Mama / Sinalização do Cálcio / Receptor alfa de Estrogênio / ATPases Transportadoras de Cálcio da Membrana Plasmática / Inibidores de Histona Desacetilases Limite: Female / Humans Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Neoplasias da Mama / Sinalização do Cálcio / Receptor alfa de Estrogênio / ATPases Transportadoras de Cálcio da Membrana Plasmática / Inibidores de Histona Desacetilases Limite: Female / Humans Idioma: En Ano de publicação: 2018 Tipo de documento: Article