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Multiple pathways of N-kinase activation in PC12 cells.
1Department of Pharmacology, New York University School of Medicine.
Journal of Neurochemistry
|February 1, 1990
Summary
N-kinase, a nerve growth factor-activated enzyme, is regulated by multiple signaling pathways in PC12 cells. Its activation by various growth factors and agents suggests a role in shared intracellular responses.
Area of Science:
- Cellular signaling
- Enzymology
- Molecular biology
Background:
- N-kinase is a nerve growth factor (NGF)-activated protein kinase with distinct substrates.
- Its regulation and specific pathways in PC12 cells were previously uncharacterized.
Purpose of the Study:
- To investigate the specificity and regulatory mechanisms of N-kinase activity.
- To elucidate the signaling pathways involved in N-kinase activation.
Main Methods:
- Utilized cell-free assays and Fast Protein Liquid Chromatography (FPLC) for enzyme characterization.
- Employed PC12 cell lines with specific enzyme deficiencies and conducted experiments with various activating agents (NGF, EGF, bFGF, phorbol ester, dibutyryl cyclic AMP).
Main Results:
- N-kinase is activated by multiple agents (NGF, EGF, bFGF, phorbol ester, dibutyryl cyclic AMP) through distinct initial pathways.
- Activated N-kinase exhibits consistent chromatographic and substrate specificity across different activators, suggesting interconvertible forms.
- Specific pathway inhibitors and cell lines confirmed independent activation routes, implicating protein kinase C and cyclic AMP-dependent protein kinase II.
Conclusions:
- N-kinase activation involves multiple second-messenger pathways.
- N-kinase may be identical to ribosomal S6 protein kinase.
- Its ability to be stimulated by diverse signals suggests a significant role in mediating shared intracellular responses.