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Modulation of Ca2+ channel current by mu opioid receptors in prefrontal cortex pyramidal neurons in rats

Rafał Rola1, Michał Jarkiewicz, Paweł Szulczyk

  • 1Department of Physiology and Department of Experimental and Clinical Physiology, The Medical University of Warsaw, Krakowskie Przedmieście 26/28, 00-325 Warsaw, Poland.

Acta Neurobiologiae Experimentalis
|April 5, 2008
PubMed

Insights

Activation of mu opioid receptors in rat medial prefrontal cortex neurons inhibits N-type calcium channel currents. This effect involves protein kinase A, highlighting a key pathway in neuronal signaling.

Area of Science:

  • Neuroscience
  • Neuropharmacology
  • Molecular Biology

Background:

  • The medial prefrontal cortex (mPFC) plays a crucial role in executive functions.
  • Opioid receptors, particularly the mu opioid receptor (MOR), are involved in modulating neuronal activity.
  • Calcium channels are critical for neurotransmitter release and neuronal excitability.

Purpose of the Study:

  • To investigate the effects of mu opioid receptor activation on high-threshold calcium currents in rat mPFC pyramidal neurons.
  • To elucidate the specific calcium channel subtypes involved and the intracellular signaling pathways mediating these effects.

Main Methods:

  • Electrophysiological recordings (whole-cell patch-clamp) of Ca2+/Ba2+ currents in freshly dispersed rat mPFC pyramidal neurons.
  • Application of the selective MOR agonist DAMGO and antagonists naloxone and omega-Conotoxin GVIA.
  • Involvement of adenylyl cyclase and protein kinase A (PKA) investigated using specific inhibitors (SQ 22536, H-89).

Main Results:

  • DAMGO (1 microM) significantly reduced Ca2+ current amplitudes.
  • The inhibitory effect of DAMGO was reversed by naloxone and blocked by omega-Conotoxin GVIA, indicating N-type calcium channel involvement.
  • Inhibition of adenylyl cyclase and PKA also reduced Ca2+ currents, and the MOR-mediated inhibition was dependent on PKA activation.

Conclusions:

  • Activation of mu opioid receptors in mPFC pyramidal neurons inhibits N-type calcium channel currents.
  • Protein kinase A is a key component of the intracellular signaling cascade mediating this inhibitory effect.
  • These findings reveal a specific neurobiological mechanism by which opioids modulate mPFC neuronal function.

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