Abstract
Flow-induced production of nitric oxide (NO) by endothelial cells plays a fundamental role in vascular homeostasis. However, the mechanisms by which shear stress activates NO production remain unclear due in part to limitations in measuring NO, especially under flow conditions. Shear stress elicits the release of ATP, but the relative contribution of autocrine stimulation by ATP to flow-induced NO production has not been established. Furthermore, the importance of calcium in shear stress-induced NO production remains controversial, and in particular the role of capacitive calcium entry (CCE) has yet to be determined. We have utilized our unique NO measurement device to investigate the role of ATP autocrine signaling and CCE in shear stress-induced NO production. We found that endogenously released ATP and downstream activation of purinergic receptors and CCE plays a significant role in shear stress-induced NO production. ATP-induced eNOS phophorylation under static conditions is also dependent on CCE. Inhibition of protein kinase C significantly inhibited eNOS phosphorylation and the calcium response. To our knowledge, we are the first to report on the role of CCE in the mechanism of acute shear stress-induced NO response. In addition, our work highlights the importance of ATP autocrine signaling in shear stress-induced NO production.
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Abbreviations
- NO:
-
Nitric oxide
- EC:
-
Endothelial cells
- BAPTA:
-
1,2-Bis(2-aminophenoxy)ethane-N,N,N,N-tetraacetic acid
- ER:
-
Endoplasmic reticulum
- BAECs:
-
Bovine aortic endothelial cells
- IP3 :
-
Inositol triphosphate
- PKC:
-
Protein kinase C
- DAG:
-
Diacylglycerol
- CCE:
-
Capacitative calcium entry
- SOCs:
-
Store operated channels
- SKF:
-
SKF-96365
- Cheler:
-
Chelerythrine
- PBS:
-
Dulbecco’s phosphate buffered saline
- l-NAME:
-
Nω-Nitro-l-arginine methyl ester
- eNOS:
-
Endothelial nitric oxide synthase.
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Acknowledgments
This work was supported by the following Grants: NIH/HL068164, NSF/BES0301446, NSF/CBET0730547, NIH U01HL116256.
Conflict of interest
Dr. Andrews has nothing to disclose. Dr. Jaron reports Grants from NIH, from NSF, during the conduct of the study. Dr. Buerk has nothing to disclose. Dr. Barbee reports Grants from NIH, Grants from NSF, during the conduct of the study.
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Associate Editor Michael R. King oversaw the review of this article.
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Andrews, A.M., Jaron, D., Buerk, D.G. et al. Shear Stress-Induced NO Production is Dependent on ATP Autocrine Signaling and Capacitative Calcium Entry. Cel. Mol. Bioeng. 7, 510–520 (2014). https://doi.org/10.1007/s12195-014-0351-x
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DOI: https://doi.org/10.1007/s12195-014-0351-x