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Journal of Neuroscience, Vol 15, 6552-6561, Copyright © 1995 by Society for Neuroscience
Cannabinoids activate an inwardly rectifying potassium conductance and inhibit Q-type calcium currents in AtT20 cells transfected with rat brain cannabinoid receptor
K Mackie, Y Lai, R Westenbroek and R Mitchell
Department of Anesthesiology, University of Washington, Seattle 98195, USA.
Rat brain cannabinoid receptor (CB-1) was stably transfected into the
murine tumor line AtT-20 to study its coupling to inwardly rectifying
potassium currents (Kir) and high voltage-activated calcium currents (ICa).
In cells expressing CB-1 ("A-2" cells), cannabinoid agonist potently and
stereospecifically activated Kir via a pertussis toxin- sensitive G
protein. ICa in A-2 cells was sensitive to dihydropyridines and omega CTX
MVIIC, less so to omega CgTX GVIA and insensitive to omega Aga IVa. In CB-1
expressing cells, cannabinoid agonist inhibited only the omega CTX
MVIIC-sensitive component of ICa. Inhibition of Q- type ICa was voltage
dependent and PTX sensitive, thus similar in character to the well-studied
modulation of N-type ICa. An endogenous cannabinoid, anandamide, activated
Kir and inhibited ICa as efficaciously as potent cannabinoid agonist.
Immunocytochemical studies with antibodies specific for class A, B, C, D,
and E voltage-dependent calcium channel alpha 1 subunits revealed that
AtT-20 cells express each of these major classes of alpha 1 subunit.
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