Title : Inhibition of mTOR activity restores tamoxifen response in breast cancer cells with aberrant Akt Activity.

Pub. Date : 2004 Dec 1

PMID : 15585641






6 Functional Relationships(s)
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1 Inhibition of mTOR activity restores tamoxifen response in breast cancer cells with aberrant Akt Activity. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
2 This study evaluated the efficacy of mTOR inhibition in the treatment of tamoxifen-resistant breast carcinoma characterized by high Akt activity. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
3 We found that MCF-7 breast cancer cell lines expressing a constitutively active Akt are able to proliferate under reduced estrogen conditions and are resistant to the growth inhibitory effects of tamoxifen, both in vitro as well as in vivo in xenograft models. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
4 These data corroborate prior findings indicating that Akt activation induces resistance to tamoxifen in breast cancer cells. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
5 Importantly, these data indicate a novel mechanism for tamoxifen resistance and suggest that blockage of the phosphatidylinositol 3"-kinase/Akt signaling pathway by mTOR inhibition effectively restores the susceptibility of these cells to tamoxifen. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
6 Importantly, these data indicate a novel mechanism for tamoxifen resistance and suggest that blockage of the phosphatidylinositol 3"-kinase/Akt signaling pathway by mTOR inhibition effectively restores the susceptibility of these cells to tamoxifen. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens