Channelpedia

G protein-gated K+ channel (GIRK1) protein is expressed presynaptically in the paraventricular nucleus of the hypothalamus.

K I Morishige, A Inanobe, N Takahashi, Y Yoshimoto, H Kurachi, A Miyake, Y Tokunaga, T Maeda, Y Kurachi

Biochem. Biophys. Res. Commun., 1996 Mar 18 , 220, 300-5

We prepared a specific antibody against GIRK1, the major subunit of the G protein-gated K+ (KG) channel. Immunohistochemical study revealed that GIRK1 immunoreactivity was detected in the presynaptic, but not in the postsynaptic, region in the paraventricular nucleus of the rat hypothalamus (PVN). Therefore, activation of the KG channel may underlie presynaptic inhibition of neurotransmitter release by various agonists, such as dopamine, noradrenaline, opioids, and histamine, in PVN.

http://www.ncbi.nlm.nih.gov/pubmed/8645300