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DOI: 10.1055/a-1476-7873
Fine-Tuning of Platelet Responses by Serine/Threonine Protein Kinases and Phosphatases—Just the Beginning
Funding K.J. and U.W. are supported by the German Federal Ministry of Education and Research (BMBF 01EO1003 and 01EO1503).![](https://www.thieme-connect.de/media/10.1055-s-00034925/202103/lookinside/thumbnails/10-1055-a-1476-7873_200096-1.jpg)
Abstract
Comprehensive proteomic analyses of human and murine platelets established an extraordinary intracellular repertoire of signaling components, which control crucial functions. The spectrum of platelet serine/threonine protein kinases (more than 100) includes the AGC family (protein kinase A, G, C [PKA, PKG, PKC]), the mitogen-activated protein kinases (MAPKs), and others. PKA and PKG have multiple significantly overlapping substrates in human platelets, which possibly affect functions with clear “signaling nodes” of regulation by multiple protein kinases/phosphatases. Signaling nodes are intracellular Ca2+ stores, the contractile system (myosin light chains), and other signaling components such as G-proteins, protein kinases, and protein phosphatases. An example for this fine-tuning is the tyrosine kinase Syk, a crucial component of platelet activation, which is controlled by several serine/threonine and tyrosine protein kinases as well as phosphatases. Other protein kinases including PKA/PKG modulate protein phosphatase 2A, which may be a master regulator of MAPK signaling in human platelets. Protein kinases and in particular MAPKs are targeted by an increasing number of clinically used inhibitors. However, the precise regulation and fine-tuning of these protein kinases and their effects on other signaling components in platelets are only superficially understood—just the beginning. However, promising future approaches are in sight.
Publikationsverlauf
Eingereicht: 23. Dezember 2020
Angenommen: 06. April 2021
Artikel online veröffentlicht:
30. Juni 2021
© 2021. Thieme. All rights reserved.
Georg Thieme Verlag KG
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