scholarly journals Neural Cell Adhesion Molecule 2 Promotes the Formation of Filopodia and Neurite Branching by Inducing Submembrane Increases in Ca2+ Levels

2015 ◽  
Vol 35 (4) ◽  
pp. 1739-1752 ◽  
Author(s):  
L. Sheng ◽  
I. Leshchyns'ka ◽  
V. Sytnyk
Keyword(s):  
Cell Adhesion ◽  
Adhesion Molecule ◽  
Cell Adhesion Molecule ◽  
Neural Cell Adhesion Molecule ◽  
Neural Cell ◽  
Neural Cell Adhesion

Expression of Neural Cell Adhesion Molecule and Polysialic Acid in Cultured Spiral Ganglion Neurons

Skull Base ◽  
2007 ◽  
Vol 17 (S 1) ◽  
Author(s):  
Kyoung Ho Park ◽  
Ki Hong Jang ◽  
Sang Yeo ◽  
Helge Rask-Andersen ◽  
Frederic Troy, II
Keyword(s):  
Cell Adhesion ◽  
Adhesion Molecule ◽  
Cell Adhesion Molecule ◽  
Neural Cell Adhesion Molecule ◽  
Polysialic Acid ◽  
Spiral Ganglion ◽  
Neural Cell ◽  
Spiral Ganglion Neurons ◽  
Neural Cell Adhesion ◽  
Ganglion Neurons

scholarly journals Regulation of Neural Cell Adhesion Molecule Polysialylation: Evidence for Nontranscriptional Control and Sensitivity to an Intracellular Pool of Calcium

1998 ◽  
Vol 140 (5) ◽  
pp. 1177-1186 ◽  
Author(s):  
Juan L. Brusés ◽  
Urs Rutishauser
Keyword(s):  
Cell Adhesion ◽  
Adhesion Molecule ◽  
Cell Adhesion Molecule ◽  
Neural Cell Adhesion Molecule ◽  
Calcium Ionophore ◽  
Cytosolic Calcium ◽  
Neural Cell ◽  
Ciliary Ganglion ◽  
Cellular Mechanisms ◽  
Neural Cell Adhesion

The up- and downregulation of polysialic acid–neural cell adhesion molecule (PSA–NCAM) expression on motorneurons during development is associated respectively with target innervation and synaptogenesis, and is regulated at the level of PSA enzymatic biosynthesis involving specific polysialyltransferase activity. The purpose of this study has been to describe the cellular mechanisms by which that regulation might occur. It has been found that developmental regulation of PSA synthesis by ciliary ganglion motorneurons is not reflected in the levels of polysialyltransferase-1 (PST) or sialyltransferase-X (STX) mRNA. On the other hand, PSA synthesis in both the ciliary ganglion and the developing tectum appears to be coupled to the concentration of calcium in intracellular compartments. This study documents a calcium dependence of polysialyltransferase activity in a cell-free assay over the range of 0.1–1 mM, and a rapid sensitivity of new PSA synthesis, as measured in a pulse–chase analysis of tissue explants, to calcium ionophore perturbation of intracellular calcium levels. Moreover, the relevant calcium pool appears to be within a specific intracellular compartment that is sensitive to thapsigargin and does not directly reflect the level of cytosolic calcium. Perturbation of other major second messenger systems, such as cAMP and protein kinase–dependent pathways, did not affect polysialylation in the pulse chase analysis. These results suggest that the shuttling of calcium to different pools within the cell can result in the rapid regulation of PSA synthesis in developing tissues.

scholarly journals Neural cell adhesion molecule promotes accumulation of TGN organelles at sites of neuron-to-neuron contacts

2002 ◽  
Vol 159 (4) ◽  
pp. 649-661 ◽  
Author(s):  
Vladimir Sytnyk ◽  
Iryna Leshchyns'ka ◽  
Markus Delling ◽  
Galina Dityateva ◽  
Alexander Dityatev ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Adhesion Molecule ◽  
Hippocampal Neurons ◽  
Cell Adhesion Molecule ◽  
Neural Cell Adhesion Molecule ◽  
Neural Cell ◽  
Initial Contact ◽  
Neural Cell Adhesion ◽  
Intracellular Organelles ◽  
Cultured Hippocampal Neurons

Transformation of a contact between axon and dendrite into a synapse is accompanied by accumulation of the synaptic machinery at this site, being delivered in intracellular organelles mainly of TGN origin. Here, we report that in cultured hippocampal neurons, TGN organelles are linked via spectrin to clusters of the neural cell adhesion molecule (NCAM) in the plasma membrane. These complexes are translocated along neurites and trapped at sites of initial neurite-to-neurite contacts within several minutes after initial contact formation. The accumulation of TGN organelles at contacts with NCAM-deficient neurons is reduced when compared with wild-type cells, suggesting that NCAM mediates the anchoring of intracellular organelles in nascent synapses.

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