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Published on: July 6, 2019
Analysis of CaM-kinase signaling in cells
Gary A Wayman1, Hiroshi Tokumitsu, Monika A Davare
1Program in Neuroscience, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, WA, USA. waymang@vetmed.wsu.edu
Abstract:
A change in intracellular free calcium is a common signaling mechanism that modulates a wide array of physiological processes in most cells. Responses to increased intracellular Ca(2+) are often mediated by the ubiquitous protein calmodulin (CaM) that upon binding Ca(2+) can interact with and alter the functionality of numerous proteins including a family of protein kinases referred to as CaM-kinases (CaMKs). Of particular interest are multifunctional CaMKs, such as CaMKI, CaMKII, CaMKIV and CaMKK, that can phosphorylate multiple downstream targets. This review will outline several protocols we have used to identify which members and/or isoforms of this CaMK family mediate specific cellular responses with a focus on studies in neurons. Many previous studies have relied on a single approach such as pharmacological inhibitors or transfected dominant-negative kinase constructs. Since each of these protocols has its limitations, that will be discussed, we emphasize the necessity to use multiple, independent approaches in mapping out cellular signaling pathways.
Insights
Understanding calcium signaling pathways is crucial for cell function. This review highlights methods to identify calmodulin-kinases (CaMKs) involved in cellular responses, emphasizing the need for multiple approaches.
Area of Science:
- Cellular Biology
- Neuroscience
- Biochemistry
Background:
- Intracellular calcium (Ca2+) changes are key signaling events modulating cellular processes.
- Calmodulin (CaM) mediates Ca2+ signaling by interacting with numerous proteins, including Ca2+/calmodulin-dependent protein kinases (CaMKs).
- Multifunctional CaMKs (e.g., CaMKI, CaMKII, CaMKIV, CaMKK) phosphorylate multiple downstream targets, playing significant roles in cellular regulation.
Purpose of the Study:
- To review protocols for identifying specific CaMK members and isoforms mediating cellular responses.
- To focus on the application of these protocols in neuronal studies.
- To emphasize the importance of using multiple, independent methods for pathway elucidation.
Main Methods:
- Discussion of various experimental protocols used to investigate CaMK function.
- Examination of limitations associated with single-approach studies, such as pharmacological inhibitors or dominant-negative constructs.
- Highlighting the necessity of employing diverse, independent methodologies.
Main Results:
- Identification of specific CaMKs and isoforms requires careful consideration of experimental limitations.
- No single method is sufficient for definitively mapping CaMK-mediated signaling pathways.
- A multi-pronged approach provides more robust and reliable results.
Conclusions:
- Mapping CaMK signaling pathways in cellular responses, particularly in neurons, necessitates the integration of multiple independent experimental strategies.
- Combining different techniques overcomes the limitations inherent in any single method.
- This integrated approach is essential for accurately deciphering complex cellular signaling networks.
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