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Plasma membrane calcium channels in the regulation of hypoxia events in breast cancer cells

Citation

Azimi, I, Plasma membrane calcium channels in the regulation of hypoxia events in breast cancer cells, ASCEPT-MPGPCR Joint Scientific Meeting 2016: Therapeutic targeting: right place, right time, right effect, 27-30 November 2016, Melbourne, Australia, pp. 2. (2016) [Conference Extract]


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Abstract

Introduction: Calcium signalling plays a crucial role in a variety of cellular processes important in tumorigenesis including migration, invasion and proliferation. Calcium influx pathways in cancer cells are often mediated by plasma membrane calcium channels including Orai proteins and transient receptor potential (TRP) channels. Hypoxia is a hallmark of the tumour microenvironment and is associated with increased metastasis and poor patient survival. The association between hypoxia and Ca2+ influx in breast cancer cells has not been fully explored.

Aims: To assess the role of TRP and Orai-mediated calcium entry in hypoxia mediated cellular events in basal breast cancer cells.

Methods: Basal breast cancer cell lines assessed included MDA-MB-468, HCC1569 and MDA-MB-231. Pharmacological activators or inhibitors or siRNA were used to activate or block channel activity or expression. A Fluorescence Imaging Plate Reader (FLIPRTETRA) was used to assess intracellular free Ca2+ ([Ca2+]CYT). RNA and protein levels were quantified using real-time RT-PCR and immunoblotting respectively. Real time RT-PCR and/or next-generation sequencing was used to identify targets that were sensitive to ion channel modulation during hypoxia.

Results: Specific TRP channels were identified as regulators of vimentin protein expression induced by hypoxia and epidermal growth factor (EGF) in basal breast cancer cells. Orai proteins were demonstrated to be isoform dependent regulators of cellular events associated with cell migration and inflammatory responses during hypoxia.

Discussion: The isoform specific roles of Orai and TRP proteins suggests that the hypoxic phenotype exploits different ion channels to achieve different cellular functions. These studies suggest that specific Orai and TRP isoforms may represent potential therapeutic targets for the control of processes associated with breast cancer progression.

Item Details

Item Type:Conference Extract
Keywords:calcium channels, hypoxia, breast cancer cells
Research Division:Biomedical and Clinical Sciences
Research Group:Pharmacology and pharmaceutical sciences
Research Field:Basic pharmacology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the health sciences
UTAS Author:Azimi, I (Dr Iman Azimi)
ID Code:151226
Year Published:2016
Deposited By:Pharmacy
Deposited On:2022-07-25
Last Modified:2022-07-28
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