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ZnR/GPR39 upregulation of K+/Cl−-cotransporter 3 in tamoxifen resistant breast cancer cells

Mero, Maayan, Asraf, Hila, Sekler, Israel, Taylor, Kathryn M. ORCID: and Hershfinkel, Michal 2019. ZnR/GPR39 upregulation of K+/Cl−-cotransporter 3 in tamoxifen resistant breast cancer cells. Cell Calcium 81 , pp. 12-20. 10.1016/j.ceca.2019.05.005

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Expression of the zinc receptor, ZnR/GPR39, is increased in higher grade breast cancer tumors and cells. Zinc, its ligand, is accumulated at larger concentrations in the tumor tissue and can therefore activate ZnR/GPR39-dependent Ca2+ signaling leading to tumor progression. The K+/Cl− co-transporters (KCC), activated by intracellular signaling, enhance breast cancer cell migration and invasion. We asked if ZnR/GPR39 enhances breast cancer cell malignancy by activating KCC. Activation of ZnR/GPR39 by Zn2+ upregulated K+/Cl− co-transport activity, measured using NH4+ as a surrogate to K+ while monitoring intracellular pH. Upregulation of NH4+ transport was monitored in tamoxifen resistant cells with functional ZnR/GPR39-dependent Ca2+ signaling but not in MCF-7 cells lacking this response. The NH4+ transport was Na+-independent, and we therefore focused on KCC family members. Silencing of KCC3, but not KCC4, expression abolished Zn2+-dependent K+/Cl− co-transport, suggesting that KCC3 is mediating upregulated NH4+ transport. The ZnR/GPR39-dependent KCC3 activation accelerated scratch closure rate, which was abolished by inhibiting KCC transport with [(DihydroIndenyl) Oxy] Alkanoic acid (DIOA). Importantly, silencing of either ZnR/GPR39 or KCC3 attenuated Zn2+-dependent scratch closure. Thus, a novel link between KCC3 and Zn2+, via ZnR/GPR39, promotes breast cancer cell migration and proliferation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Publisher: Elsevier
ISSN: 0143-4160
Date of First Compliant Deposit: 28 May 2019
Date of Acceptance: 20 May 2019
Last Modified: 07 Mar 2024 16:43

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