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Related Concept Videos

GPCR Desensitization01:12

GPCR Desensitization

G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
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Related Experiment Video

Updated: Jul 18, 2026

Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
07:43

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Published on: May 12, 2015

Chronically increased Gsalpha signaling disrupts associative and spatial learning.

Rusiko Bourtchouladze1, Susan L Patterson, Michele P Kelly

  • 1Center for Neurobiology and Behavior and Howard Hughes Medical Institute, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|December 5, 2006
PubMed
Summary

Altering the cAMP/PKA pathway in mice disrupts learning and memory. Increased signaling impairs spatial and fear learning, highlighting the need for regulated G-protein alpha subunit signaling.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • The cyclic adenosine monophosphate/protein kinase A (cAMP/PKA) pathway is crucial for learning and memory across species.
  • In Drosophila, deviations from optimal cAMP/PKA signaling negatively impact olfactory learning.

Purpose of the Study:

  • To investigate the behavioral and physiological consequences of elevated cAMP/PKA pathway signaling in the mouse forebrain.
  • To provide genetic evidence for the role of this pathway in mammalian learning and memory.

Main Methods:

  • Generation of transgenic mice expressing a constitutively active Gsalpha subunit (Gsalpha* Q227L) in forebrain neurons under the CaMKIIalpha promoter.
  • Assessment of adenylyl cyclase activity, cAMP levels, phosphodiesterase activity, and basal synaptic transmission.
  • Evaluation of learning and memory performance using the Morris water maze and fear conditioning tasks.

Main Results:

  • Transgenic mice showed increased adenylyl cyclase activity but compensatory increases in phosphodiesterase activity, leading to decreased cAMP levels.
  • Enhanced basal synaptic transmission was observed in Gsalpha* transgenic mice.
  • Impaired performance in spatial learning (Morris water maze) and fear conditioning (contextual and cued) tasks was evident.

Conclusions:

  • Regulated Gsalpha protein signaling is essential for associative and spatial learning in mice.
  • The findings support the conserved role of the cAMP/PKA pathway in learning and memory from invertebrates to mammals.
  • Dysregulation of this pathway, even with compensatory mechanisms, leads to significant cognitive deficits.