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cAMP

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Cyclic Adenosine Monophosphate (cAMP)

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Overview

Cyclic adenosine monophosphate (cAMP) is a crucial second messenger involved in various biological processes. It is synthesized from Adenosine Triphosphate (ATP) by the enzyme Adenylyl cyclase, which is activated by G-protein α-subunits in response to extracellular signals such as Neurotransmitters.

Synthesis

  • Enzyme: Adenylyl cyclase
  • Substrate: Adenosine triphosphate (ATP)
  • Activation: Triggered by G-protein coupled receptors upon ligand binding (e.g., neurotransmitters).

Mechanism of Action

  • Primary Effector: Activates Protein Kinase A (PKA).
  • Phosphorylation: PKA phosphorylates various target proteins, including ion channels like potassium channels, affecting cellular activity.

Biological Roles

  • Cellular Signaling: Translates extracellular signals into cellular responses.
  • Metabolic Regulation: Involved in lipid and glucose metabolism.
  • Gene Expression: Influences gene expression by interacting with transcription factors.
  • Neurobiology: Essential for synaptic Plasticity, learning, and memory.
    • Example: In Aplysia californica, increased cAMP levels enhance neurotransmitter release, facilitating learning processes like sensitization.
    • Long-Term Potentiation (LTP): Plays a role in LTP - long term potentiation in the Hippocampus, crucial for long-term memory formation.

Physiological Effects

  • Heart Rate Modulation: Influences cardiac function.
  • Cell Division: Participates in cell cycle regulation.
  • Ion Channel Regulation: Modulates ion channels, impacting electrical properties of cells.

Comparison with cGMP

  • Primary Enzyme: cAMP is synthesized by adenylate cyclase, while cGMP is synthesized by guanylate cyclase.
  • Second Messenger Role: cAMP is primarily involved in metabolic regulation and gene expression, whereas cGMP is more involved in cardiovascular and nervous system functions.
  • Target Kinases: cAMP activates protein kinase A (PKA), while cGMP activates protein kinase G (PKG).

Importance

cAMP is a pivotal signaling molecule that mediates a wide range of physiological processes, from hormone response to memory formation, highlighting its versatility and significance in cellular communication pathways.

Sources:

see also

Tags: neurobiology science
Superlink: 051 ☣Neurobiology 050 🧠Neuroscience
Sensory Physiology

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Created: 20-07-24 16:37