Arachidonic acid-induced Ca
2+ entry and migration in a neuroendocrine cancer cell line.
Cancer Cell Int 2018;
18:30. [PMID:
29507531 PMCID:
PMC5834873 DOI:
10.1186/s12935-018-0529-8]
[Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 02/24/2018] [Indexed: 12/16/2022] Open
Abstract
Background
Store-operated Ca2+ entry (SOCE) has been implicated in the migration of some cancer cell lines. The canonical SOCE is defined as the Ca2+ entry that occurs in response to near-maximal depletion of Ca2+ within the endoplasmic reticulum. Alternatively, arachidonic acid (AA) has been shown to induce Ca2+ entry in a store-independent manner through Orai1/Orai3 hetero-multimeric channels. However, the role of this AA-induced Ca2+ entry pathway in cancer cell migration has not been adequately assessed.
Methods
The present study investigated the involvement of AA-induced Ca2+ entry in migration in BON cells, a model gastro-enteropancreatic neuroendocrine tumor (GEPNET) cell line using pharmacological and gene knockdown methods in combination with live cell fluorescence imaging and standard migration assays.
Results
We showed that both the store-dependent and AA-induced Ca2+ entry modes could be selectively activated and that exogenous administration of AA resulted in Ca2+ entry that was pharmacologically distinct from SOCE. Also, whereas homomeric Orai1-containing channels appeared to largely underlie SOCE, the AA-induced Ca2+ entry channel required the expression of Orai3 as well as Orai1. Moreover, we showed that AA treatment enhanced the migration of BON cells and that this migration could be abrogated by selective inhibition of the AA-induced Ca2+ entry.
Conclusions
Taken together, these data revealed that an alternative Orai3-dependent Ca2+ entry pathway is an important signal for GEPNET cell migration.
Electronic supplementary material
The online version of this article (10.1186/s12935-018-0529-8) contains supplementary material, which is available to authorized users.
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