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Front. Physiol. | doi: 10.3389/fphys.2018.00266

Stanniocalcin 2 regulates non-capacitative Ca2+ entry and aggregation in mouse platelets.

Esther Lopez1, Luis Gómez-Gordo1,  Carlos Cantonero1, Nuria Bermejo2, Antonio J. Corbacho3,  Jorge Perez4, María P. Granados5,  Gines M. Salido1,  JUAN A. ROSADO DIONISIO1 and  Pedro C. Redondo Liberal1*
  • 1Physiology, University of Extremadura, Spain
  • 2Hematology Unit. San Pedro de Alcantara Hospital, Extremadura Health Service, Spain
  • 3Blood Donation Bank, Extremadura Health Service, Spain
  • 4Department of Didactics of Music, Plastic and Body Expression, Universidad de Extremadura, Spain
  • 5Pharmacology Deparment, Extremadura Health Service, Spain

Stanniocalcin 2 (STC2) is a fish protein that controls body Ca2+ and phosphate metabolism. STC2 has also been described in mammals, and as platelet function highly depends on both extracellular and intracellular Ca2+, we have explored its expression and function in these cells. STC2-/- mice exhibit shorter tail bleeding time than WT mice. Platelets from STC2-deficient mice showed enhanced aggregation, as well as enhanced Ca2+ mobilization in response to the physiological agonist thrombin (Thr) and the diacylglycerol analog, OAG, a selective activator of the non-capacitative Ca2+ entry channels. Interestingly, platelets from STC2-/- mice exhibit attenuated interaction between STIM1 and Orai1 in response to Thr, thus suggesting that STC2 is required for Thr-evoked STIM1-Orai1 interaction and the subsequent store-operated Ca2+ entry (SOCE). We have further assessed possible changes in the expression of the most relevant channels involved in non-capacitative Ca2+ entry in platelets. Then, protein expression of Orai3, TRPC3 and TRPC6 were evaluated by Western blotting, and the results revealed that while the expression of Orai3 was enhanced in the STC2-deficient mice, others like TRPC3 and TRPC6 remains almost unaltered. Summarizing, our results provide for the first time evidence for a role of STC2 in platelet physiology through the regulation of agonist-induced Ca2+ entry, which might be mediated by the regulation of Orai3 channel expression.

Keywords: STC-2, platelets, non-SOCE, Orai3, TRPC3, TRPC6

Received: 08 Nov 2017; Accepted: 08 Mar 2018.

Edited by:

Agustín Guerrero-Hernández, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico

Reviewed by:

Nicolas Demaurex, Université de Genève, Switzerland
Olivier MIGNEN, Université de Bretagne Occidentale, France  

Copyright: © 2018 Lopez, Gómez-Gordo, Cantonero, Bermejo, Corbacho, Perez, Granados, Salido, ROSADO DIONISIO and Redondo Liberal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Pedro C. Redondo Liberal, University of Extremadura, Physiology, Avenida de la Universidad S/N, Cáceres, 10003, Extremadura, Spain,