Abstract
17β-Estradiol (17β-E2) augments VEGF-A expression in various estrogen targeted organs and cells including breast tumor derived cell lines, via an ER-α mediated pathway. Ironically, 17β-E2 is able to regulate some genes via ER-α independent pathways. In the present study, we sought to determine whether 17β-E2 can modulate VEGF-A expression in absence of ER-α, and therefore, three different cell lines including ER-α+ MCF-7, and ER-α SKBR-3 and HMEC were used for this study. The present study demonstrates that 17β-E2 also induces VEGF-A mRNA expression in ER-negative SKBR-3 breast tumor cells in a manner similar to that observed in ER-positive MCF-7 cells. Blocking the induced-expression by antiestrogen ICI 182,780 indicates the induction pathway is ER dependent. While ER-α mRNA is absent in both HMEC and SKBR-3 cells, the impact of estrogen was found only in SKBR-3 cells, suggesting the existence of an analogue to ER-α or overlapping signal in these cells. Consistent with this suggestion, the present studies demonstrate the existence of an ER-αvar2 protein in MCF-7 and in SKBR-3 cells. This variant is predominantly localized in the nuclei of SKBR-3 cells. Importantly, specific binding of 17β-E2 by these cells suggest the ER-αvar2 may act as active receptor in SKBR-3 cells. (Mol Cell Biochem 262: 215–224, 2004)
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Sengupta, K., Banerjee, S., Saxena, N.K. et al. Differential expression of VEGF-A mRNA by 17β-estradiol in breast tumor cells lacking classical ER-α may be mediated through a variant form of ER-α. Mol Cell Biochem 262, 215–224 (2004). https://doi.org/10.1023/B:MCBI.0000038237.33875.d0
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DOI: https://doi.org/10.1023/B:MCBI.0000038237.33875.d0