Related Experiment Videos
Differential effects of protein kinase inhibitors and activators on memory formation in the 2-day-old chick
P A Serrano1, D S Beniston, M G Oxonian
1Department of Psychology, University of California at Berkeley 94720.
Abstract:
Thirteen protein kinase inhibitors (PKIs) were investigated in chicks for their in vitro effects on PKC activity and for their in vivo effects on memory formation for a peak-avoidance task. Amnesia occurred by 15-30 min post-training when agents that inhibit primarily Ca2+/calmodulin were injected into brain. Amnesia occurred by 60 min post-training when agents that inhibit PKC-, PKA-, and/or PKG-dependent protein kinases, but not Ca2+/calmodulin, were injected. Enhancement of memory formation was accomplished by injecting bradykinin, but not forskolin. Both of these agents, however, attenuated the amnesia produced by H-7. These results are discussed as relevant neural processes involved in memory and synaptic plasticity.
Insights
Protein kinase inhibitors (PKIs) impact chick memory formation. Inhibiting Ca2+/calmodulin caused rapid amnesia, while inhibiting other kinases caused delayed amnesia, suggesting distinct roles in memory processes.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Protein kinases play crucial roles in cellular signaling pathways.
- Understanding the specific roles of different kinases in memory formation is essential for neuroscience research.
- Synaptic plasticity, the ability of synapses to strengthen or weaken over time, is a key mechanism underlying learning and memory.
Purpose of the Study:
- To investigate the in vitro effects of thirteen protein kinase inhibitors (PKIs) on protein kinase C (PKC) activity.
- To examine the in vivo effects of these PKIs on memory formation in chicks using a peak-avoidance task.
- To elucidate the involvement of specific kinase pathways in memory consolidation and potential therapeutic targets.
Main Methods:
- In vitro assays were performed to assess the inhibitory effects of PKIs on PKC activity.
- Chicks were trained on a peak-avoidance task, and PKIs were administered intracranially at various time points post-training.
- Behavioral responses were monitored to evaluate memory retention and induce amnesia or memory enhancement.
Main Results:
- Inhibition of Ca2+/calmodulin-dependent kinases led to amnesia within 15-30 minutes post-training.
- Inhibition of PKC-, PKA-, and/or PKG-dependent kinases resulted in amnesia at 60 minutes post-training.
- Bradykinin administration enhanced memory formation and attenuated H-7-induced amnesia, while forskolin did not enhance memory.
Conclusions:
- Distinct protein kinase pathways differentially regulate memory consolidation in chicks.
- Ca2+/calmodulin-dependent kinases appear to be involved in the early stages of memory processing.
- PKC, PKA, and PKG pathways are implicated in later stages of memory consolidation, offering potential targets for memory modulation.