Morphoregulatory activities of NCAM and N-cadherin can be accounted for by G protein-dependent activation of L- and N-type neuronal Ca2+ channels
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Summary
This summary is machine-generated.Neural cell adhesion molecules (NCAM) and N-cadherin directly trigger cell shape changes and alter cell phenotype by activating intracellular pathways. These cell adhesion molecules mediate rapid, transcription-independent neuronal differentiation in PC12 cells.
Area Of Science
- Cell Biology
- Neuroscience
- Molecular Biology
Background
- Cell adhesion molecules (CAMs) play critical roles in regulating cell behavior.
- Neural cell adhesion molecule (NCAM) and N-cadherin are key CAMs involved in neural development.
- The intracellular signaling mechanisms underlying CAM-mediated morphoregulation are not fully understood.
Purpose Of The Study
- To investigate the role of NCAM and N-cadherin in regulating cell morphology and phenotype.
- To elucidate the intracellular second messenger pathways involved in CAM-mediated signaling.
- To provide direct evidence for transmembrane signaling by CAMs.
Main Methods
- PC12 cells were cultured on 3T3 cell monolayers expressing N-cadherin or NCAM.
- Morphological changes were assessed, and specific protein immunoreactivity (Thy-1, L1/NILE, low affinity NGF receptor) was measured.
- The effects of pertussis toxin, calcium channel antagonists, and kinase inhibitors (K-252b) were evaluated.
Main Results
- NCAM and N-cadherin induced a rapid, transcription-independent shift of PC12 cells from an adrenal to a neuronal phenotype.
- These CAMs specifically increased Thy-1 immunoreactivity.
- The morphological response was inhibited by pertussis toxin and calcium channel blockers, and by K-252b, suggesting involvement of G-proteins and calcium signaling, but not broad-spectrum kinases.
Conclusions
- Cell adhesion molecules like NCAM and N-cadherin can directly alter cell phenotype.
- Transmembrane signaling pathways, involving G-proteins and calcium, mediate the morphological and biochemical responses induced by NCAM and N-cadherin.
- These findings highlight a novel mechanism of cell-cell interaction in regulating cell fate and differentiation.