Abstract
Vascular calcification may result from stimulation of osteogenic signalling with upregulation of the transcription factors CBFA1, MSX2 and SOX9, as well as alkaline phosphatase (ALPL), which degrades and thus inactivates the calcification inhibitor pyrophosphate. Osteogenic signalling further involves upregulation of the Ca2+-channel ORAI1. The channel is activated by STIM1 and then accomplishes store-operated Ca2+ entry. ORAI1 and STIM1 are upregulated by the serum & glucocorticoid inducible kinase 1 (SGK1) which is critically important for osteogenic signalling. Stimulators of vascular calcification include vasopressin. The present study explored whether exposure of human aortic smooth muscle cells (HAoSMCs) to vasopressin upregulates ORAI1 and/or STIM1 expression, store-operated Ca2+ entry and osteogenic signalling. To this end, HAoSMCs were exposed to vasopressin (100 nM, 24 h) without or with additional exposure to ORAI1 blocker MRS1845 (10 μM) or SGK1 inhibitor GSK-650394 (1 μM). Transcript levels were measured using q-RT-PCR, cytosolic Ca2+-concentration ([Ca2+]i) by Fura-2-fluorescence, and store-operated Ca2+ entry from increase of [Ca2+]i following re-addition of extracellular Ca2+ after store depletion with thapsigargin (1 μM). As a result, vasopressin enhanced the transcript levels of ORAI1 and STIM1, store-operated Ca2+ entry, as well as the transcript levels of CBFA1, MSX2, SOX9 and ALPL. The effect of vasopressin on store-operated Ca2+ entry as well as on transcript levels of CBFA1, MSX2, SOX9 and ALPL was virtually abrogated by MRS1845 and GSK-650394. In conclusion, vasopressin stimulates expression of ORAI1/STIM1, thus augmenting store-operated Ca2+ entry and osteogenic signalling. In HAoSMCs, vasopressin (VP) upregulates Ca2+ channel ORAI1 and its activator STIM1. VP upregulates store-operated Ca2+ entry (SOCE) and osteogenic signalling (OS). VP-induced SOCE, OS and Ca2+-deposition are disrupted by ORAI1 inhibitor MRS1845. VP-induced SOCE, OS and Ca2+-deposition are disrupted by SGK1 blocker GSK-650394.
Key messages
• In HAoSMCs, vasopressin (VP) upregulates Ca2+ channel ORAI1 and its activator STIM1.
• VP upregulates store-operated Ca2+ entry (SOCE) and osteogenic signalling (OS).
• VP-induced SOCE, OS and Ca2+-deposition are disrupted by ORAI1 inhibitor MRS1845.
• VP-induced SOCE, OS and Ca2+-deposition are disrupted by SGK1 blocker GSK-650394.
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The authors gratefully acknowledge the meticulous preparation of the manuscript by Lejla Subasic.
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Xuexue Zhu, Kuo Zhou and Jibin Liu are supported by the Chinese Scholarship Council. The sponsor(s) had no role in study design, the collection, analysis and interpretation of data, in the writing of the report, and in the decision to submit the article for publication.
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XZ, KM, KZ and JL performed the experiments and analysed the data; FL and BN designed the research, FL drafted and wrote the manuscript. All authors corrected and approved the manuscript.
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Zhu, X., Ma, K., Zhou, K. et al. Vasopressin-stimulated ORAI1 expression and store-operated Ca2+ entry in aortic smooth muscle cells. J Mol Med 99, 373–382 (2021). https://doi.org/10.1007/s00109-020-02016-4
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DOI: https://doi.org/10.1007/s00109-020-02016-4