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The road to ERK activation: Do neurons take alternate routes?
Nadiatou Miningou1, Kim T Blackwell2
1Department of Chemistry and Biochemistry, George Mason University, Fairfax, VA 22030, United States of America.
Abstract:
The ERK cascade is a central signaling pathway that regulates a wide variety of cellular processes including proliferation, differentiation, learning and memory, development, and synaptic plasticity. A wide range of inputs travel from the membrane through different signaling pathway routes to reach activation of one set of output kinases, ERK1&2. The classical ERK activation pathway beings with growth factor activation of receptor tyrosine kinases. Numerous G-protein coupled receptors and ionotropic receptors also lead to ERK through increases in the second messengers calcium and cAMP. Though both types of pathways are present in diverse cell types, a key difference is that most stimuli to neurons, e.g. synaptic inputs, are transient, on the order of milliseconds to seconds, whereas many stimuli acting on non-neural tissue, e.g. growth factors, are longer duration. The ability to consolidate these inputs to regulate the activation of ERK in response to diverse signals raises the question of which factors influence the difference in ERK activation pathways. This review presents both experimental studies and computational models aimed at understanding the control of ERK activation and whether there are fundamental differences between neurons and other cells. Our main conclusion is that differences between cell types are quite subtle, often related to differences in expression pattern and quantity of some molecules such as Raf isoforms. In addition, the spatial location of ERK is critical, with regulation by scaffolding proteins producing differences due to colocalization of upstream molecules that may differ between neurons and other cells.
Insights
The extracellular signal-regulated kinase (ERK) pathway controls cell functions. Differences in ERK activation between neurons and other cells are subtle, mainly due to molecular expression and spatial organization.
Area of Science:
- Cellular signaling
- Molecular biology
- Neuroscience
Background:
- The extracellular signal-regulated kinase (ERK) cascade is a crucial pathway regulating cellular processes like proliferation, differentiation, and synaptic plasticity.
- ERK activation involves diverse inputs converging on ERK1&2 kinases, initiated by receptor tyrosine kinases or G-protein coupled receptors.
- Stimuli duration differs significantly between neurons (transient) and non-neural tissues (longer duration), raising questions about ERK activation control.
Purpose of the Study:
- To investigate factors influencing ERK activation pathways.
- To compare ERK activation mechanisms between neurons and other cell types.
- To understand the role of experimental studies and computational models in elucidating ERK regulation.
Main Methods:
- Review of experimental studies on ERK signaling.
- Analysis of computational models of ERK activation.
- Comparative analysis of molecular components and spatial organization in different cell types.
Main Results:
- Differences in ERK activation between cell types are subtle, often linked to variations in molecular expression, such as Raf isoforms.
- The spatial localization of ERK, influenced by scaffolding proteins, plays a critical role in differential regulation.
- Colocalization of upstream molecules, which can vary between neurons and other cells, contributes to cell-specific ERK activation.
Conclusions:
- Cellular differences in ERK activation are not fundamental but rather nuanced, relating to molecular expression and localization.
- Scaffolding proteins and the spatial arrangement of signaling molecules are key determinants of ERK pathway regulation.
- Understanding these subtle differences is crucial for comprehending diverse cellular responses mediated by the ERK pathway.
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