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Adenosine A

Francisco M Mouro1,2, Diogo M Rombo1,2, Raquel B Dias1,2

  • 1Instituto de Farmacologia e Neurociências, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.

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|September 17, 2018
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This summary is machine-generated.

Adenosine A2A receptors positively modulate synaptic NMDA receptors in the hippocampus, enhancing synaptic plasticity. This effect is postsynaptic and does not influence extrasynaptic NMDA receptors, suggesting a role in promoting neural plasticity.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Signaling

Background:

  • NMDA receptors are crucial for synaptic plasticity and neurodegeneration.
  • Adenosine A2A receptors modulate neuronal function, influencing plasticity and cell death.

Purpose of the Study:

  • Investigate the impact of adenosine A2A receptors on NMDA receptor activity in CA1 hippocampal neurons.
  • Differentiate effects on synaptic versus extrasynaptic NMDA receptors.

Main Methods:

  • Whole-cell patch-clamp recordings in rat hippocampal CA1 pyramidal neurons.
  • Pharmacological manipulation using A2A receptor agonists (CGS 21680) and antagonists (SCH58261).
  • Involvement of PKA and NMDA receptor blockers (MK-801, memantine) were assessed.

Main Results:

  • A2A receptor activation facilitated both chemically-evoked (NMDA-PSCs) and afferent-evoked (NMDA-EPSCs) NMDA receptor currents.
  • This facilitation was postsynaptic, as indicated by no change in paired pulse ratio, and prevented by PKA inhibition.
  • The effect was observed on synaptic NMDA receptors but not extrasynaptic ones.

Conclusions:

  • Adenosine A2A receptors exert a positive postsynaptic modulatory effect on synaptic NMDA receptors in CA1 neurons.
  • This action may promote synaptic plasticity under non-pathological conditions.
  • A2A receptors do not modulate extrasynaptic NMDA receptors, distinguishing their roles.