Nucleo-cytoplasmic transport of estrogen receptor alpha in breast cancer cells.
Approximately 70% cases of breast cancers exhibit high expression and activity levels of estrogen receptor alpha (ERα), a transcription regulator that induces the expression of genes associated with cellular proliferation and survival. These nuclear functions of the receptor are associated with the development of breast cancer. However, ERα localization is not static, but rather, dynamic with continuous shuttling between the nucleus and the cytoplasm. Interestingly, both the nuclear import and export of ERα are modulated by several stimuli that include estradiol, antiestrogens, and growth factors. As ERα nuclear accumulation is critical to the regulation of gene expression, nuclear export of this receptor modulates the intensity and duration of its transcriptional activity. Thus, the subcellular spatial distribution of ERα ensures tight modulation of its concentration in cellular compartments, as well as of its nuclear and extranuclear functions. In this review, we will discuss current findings regarding the biological importance of molecular mechanisms of, and proteins responsible for, the nuclear import and export of ERα in breast cancer cells.
Programa de Investigación de Cáncer de Mama, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apdo Postal, México D.F. 04510, Mexico. Electronic address: atecalco@iibiomedicas.unam.mx.
Angeles C
AC
Tecalco-Cruz
Programa de Investigación de Cáncer de Mama, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apdo Postal, México D.F. 04510, Mexico.
Issis A
IA
Pérez-Alvarado
Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Apdo Postal, México D.F. 04510, Mexico.
Josué O
JO
Ramírez-Jarquín
Programa de Investigación de Cáncer de Mama, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apdo Postal, México D.F. 04510, Mexico.
Leticia
L
Rocha-Zavaleta
D021581:Active Transport, Cell Nucleus; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology*; D047628:Estrogen Receptor alpha / Q000737:chemistry / Q000378:metabolism*; D005260:Female; D006801:Humans; D028861:Nuclear Pore Complex Proteins / Q000378:metabolism; D015398:Signal Transduction; D014158:Transcription, Genetic
D047628:Estrogen Receptor alpha; D028861:Nuclear Pore Complex Proteins
Breast cancer; Estrogen receptor alpha; Nuclear export; Nuclear import