Modulatory effects of hypocretin-1/orexin-A with glutamate and gamma-aminobutyric acid on freshly isolated pyramidal neurons from the rat prefrontal cortex.
It is widely known that hypocretins are essential for the regulation of wakefulness. Our recent reports have found that hypocretin-1 shows a direct postsynaptic excitatory effect on rat prefrontal cortex (PFC) pyramidal neurons. It remains unclear whether hypocretin-1 may interact with two classical neurotransmitter systems, glutamate and gamma-aminobutyric acid (GABA) in rat PFC. For this reason, we here investigated the modulatory actions of hypocretin-1 with these two transmitters on freshly isolated PFC pyramidal neurons using whole-cell patch-clamp recordings. We found that coadministration of hypocretin-1 and glutamate showed a synergistic effect on the recorded cells, and hypocretin-1 could excite the neurons even if GABA was present. Thus, our data suggest that there may be hypocretin-glutamate and hypocretin-GABA interactions in the PFC.
Department of Neurobiology, Third Military Medical University, Chongqing 400038, China.
Cheng-hui
CH
Song
Xiao-wei
XW
Chen
Jian-xia
JX
Xia
Zheng-ping
ZP
Yu
Zhi-an
ZA
Hu
D000200:Action Potentials; D000818:Animals; D005625:Frontal Lobe / Q000166:cytology / Q000502:physiology*; D018698:Glutamic Acid / Q000494:pharmacology / Q000502:physiology*; D066298:In Vitro Techniques; D047908:Intracellular Signaling Peptides and Proteins / Q000494:pharmacology / Q000502:physiology*; D009479:Neuropeptides / Q000494:pharmacology / Q000502:physiology*; D000068797:Orexins; D018408:Patch-Clamp Techniques; D017966:Pyramidal Cells / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D005680:gamma-Aminobutyric Acid / Q000494:pharmacology / Q000502:physiology*
D047908:Intracellular Signaling Peptides and Proteins; D009479:Neuropeptides; D000068797:Orexins; D018698:Glutamic Acid; D005680:gamma-Aminobutyric Acid