Mutants of PC12 cells with altered cyclic AMP responses

Area of Science:

• Cell Biology
• Molecular Biology
• Neuroscience

Background:

• PC12 cells, derived from rat pheochromocytoma, are a model for neuronal differentiation.
• Elevated intracellular cyclic adenosine monophosphate (cAMP) is crucial for cellular signaling and differentiation.

Purpose of the Study:

• To generate and characterize PC12 cell variants with altered cAMP accumulation.
• To investigate the utility of these mutants in studying cAMP-mediated cellular functions, including potential links to nerve growth factor (NGF).

Main Methods:

• Mutagenesis and selection of PC12 cells using agents that modulate intracellular cAMP levels (cholera toxin, 2-chloroadenosine, 8-bromo-cAMP).
• Characterization of cAMP metabolism, including adenylate cyclase activity and cyclic nucleotide phosphodiesterase activity.
• Isolation and analysis of revertant cell lines.

Main Results:

• Over 40 PC12 cell variants with deficient cAMP accumulation were isolated.
• Some variants exhibited altered adenylate cyclase responsiveness, similar to S49 lymphoma cell phenotypes lacking the Ns coupling protein.
• Other variants showed increased cyclic nucleotide phosphodiesterase activity.
• Two revertants regained responsiveness to cAMP-inducing agents.

Conclusions:

• Generated PC12 cell mutants provide a valuable tool for dissecting cAMP-dependent signaling pathways.
• These mutants can help elucidate the role of cAMP in neural crest cell functions and its interaction with nerve growth factor signaling.