Abstract
This chapter describes signaling pathways stimulated by the P2Y2 nucleotide receptor (P2Y2R), that regulate cellular processes dependent on actin cytoskeleton dynamics in glioma C6 cells. P2Y2R coupled with G-proteins, in response to ATP or UTP, regulates the level of phosphatidylinositol-4,5-bisphosphate (PIP2) which modulates a variety of actin binding proteins and is involved in calcium response and activates Rac1 and RhoA proteins. The RhoA/ROCK signaling pathway plays an important role in contractile force generation needed for the assembly of stress fibers, focal adhesions and for tail retraction during cell migration. Blocking of this pathway by a specific Rho-kinase inhibitor induces changes in F-actin organization and cell shape and decreases the level of phosphorylated myosin II and cofilin. In glioma C6 cells these changes are reversed after UTP stimulation of P2Y2R. Signaling pathways responsible for this compensation are connected with calcium signaling. Stimulation of the Rac1 mediated pathway via Go proteins needs additional interaction between αvβ5 integrins and P2Y2Rs. Rac1 activation is necessary for cofilin phosphorylation as well as integrin activation needed for focal complexes formation and stabilization of lamellipodium. Inhibition of positive Rac1 regulation prevents glioma C6 cells from recovery of control cell like morphology.
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Abbreviations
- DAG:
-
Diacylglycerol
- EGFRs:
-
Epidermal growth factor receptors
- FAK:
-
Focal Adhesion Kinase
- GEFs:
-
Guanine nucleotide exchange factors
- GPCRs:
-
G protein-coupled receptors
- IP3 :
-
Inositol-1,4,5-trisphosphate
- LIMK:
-
LIM kinase
- MARCKS:
-
Myristoylated alanine rich C-kinase substrate
- MHC:
-
Myosin heavy chains
- MLC:
-
Myosin light chain
- MLCK:
-
Myosin light chain kinase
- MLCP:
-
Myosin light chain phosphatase
- P2Y2R:
-
P2Y2 receptor
- PAK:
-
p21 Activated kinase
- PDGFRs:
-
Platelet-derived growth factor receptors
- PI3K:
-
Phosphatidylinositol 3-kinase
- PIP2 :
-
Phosphatidylinositol-4,5-bisphosphate
- PIP 5-kinase:
-
Phosphatidylinositol-4-phosphate 5-kinase
- PIP:
-
Phosphoinositol phosphate
- PKC:
-
Protein kinase C
- PLC:
-
Phospholipase C
- P-MLC:
-
Phosphorylated myosin light chain
- PTX:
-
Pertussis toxin
- ROCK:
-
Rho-associated protein kinase
- SSH:
-
Slingshot homolog
- TESK:
-
Testis-specific kinase
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Kłopocka, W., Korczyński, J., Pomorski, P. (2013). Cytoskeleton and Nucleotide Signaling in Glioma C6 Cells. In: Barańska, J. (eds) Glioma Signaling. Advances in Experimental Medicine and Biology, vol 986. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4719-7_6
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