Article Publish Status: FREE
Abstract Title:

Pit-1 inhibits BRCA1 and sensitizes human breast tumors to cisplatin and vitamin D treatment.

Abstract Source:

Oncotarget. 2015 Jun 10 ;6(16):14456-71. PMID: 25992773

Abstract Author(s):

Samuel Seoane, Efigenia Arias, Rita Sigueiro, Juan Sendon-Lago, Anxo Martinez-Ordoñez, Esteban Castelao, Noemí Eiró, Tomás Garcia-Caballero, Manuel Macia, Rafael Lopez-Lopez, Miguel Maestro, Francisco Vizoso, Antonio Mouriño, Roman Perez-Fernandez

Article Affiliation:

Samuel Seoane


The POU class 1 homeobox 1 (POU1F1, also known as Pit-1), pertaining to the Pit-Oct-Unc (POU) family of transcription factors, has been related to tumor growth and metastasis in breast. However, its role in response to breast cancer therapy is unknown.We found that Pit-1 down-regulated DNA-damage and repair genes, and specifically inhibited BRCA1 gene expression, sensitizing breast cancer cells to DNA-damage agents. Administration of 1α, 25-dihydroxy-3-epi-vitamin D3 (3-Epi, an endogenous low calcemic vitamin D metabolite) reduced Pit-1 expression, and synergized with cisplatin, thus, decreasing cell proliferation and apoptosis in vitro, and reducing tumor growth in vivo. In addition, fifteen primary cultures of human breast tumors showed significantly decreased proliferation when treated with 3-Epi+cisplatin, compared to cisplatin alone. This response positively correlated with Pit-1 levels.Our findings demonstrate that high levels of Pit-1 and reduced BRCA1 levels increase breast cancer cell susceptibility to 3-Epi+cisplatin therapy.

Study Type : Animal Study, In Vitro Study

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