Title : Tamoxifen and tamoxifen ethyl bromide induce apoptosis in acutely damaged mammary epithelial cells through modulation of AKT activity.

Pub. Date : 2004 May 6

PMID : 14990993






9 Functional Relationships(s)
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1 At equimolar concentrations, Tam and tamoxifen ethyl bromide (QTam), a membrane impermeant analog of Tam, rapidly induced apoptosis in HMEC-E6 cells associated with an even more rapid decrease in phosphorylation of AKT at serine-473. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
2 Tamoxifen and tamoxifen ethyl bromide induce apoptosis in acutely damaged mammary epithelial cells through modulation of AKT activity. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
3 Here, we show that plasma membrane-associated E2-binding sites initiate the rapid apoptotic effects of Tam in HMEC-E6 cells through modulation of AKT activity. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
4 At equimolar concentrations, Tam and tamoxifen ethyl bromide (QTam), a membrane impermeant analog of Tam, rapidly induced apoptosis in HMEC-E6 cells associated with an even more rapid decrease in phosphorylation of AKT at serine-473. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
5 The effects of both Tam and QTam were blocked by expression of constitutively active AKT (myristoylated AKT or AKT-Thr308Asp/Ser473Asp). Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
6 The effects of both Tam and QTam were blocked by expression of constitutively active AKT (myristoylated AKT or AKT-Thr308Asp/Ser473Asp). Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
7 The effects of both Tam and QTam were blocked by expression of constitutively active AKT (myristoylated AKT or AKT-Thr308Asp/Ser473Asp). Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
8 These data indicate that Tam and QTam induce apoptosis in HMEC-E6 cells through a plasma membrane-activated AKT-signaling pathway that results in (1) decreased AKT phosphorylation at Ser-473, (2) mitochondrial membrane depolarization, and (3) activated caspase-9 and -3. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens
9 These data indicate that Tam and QTam induce apoptosis in HMEC-E6 cells through a plasma membrane-activated AKT-signaling pathway that results in (1) decreased AKT phosphorylation at Ser-473, (2) mitochondrial membrane depolarization, and (3) activated caspase-9 and -3. Tamoxifen AKT serine/threonine kinase 1 Homo sapiens