Both kappa and mu opioid agonists inhibit glutamatergic input to ventral tegmental area neurons.

Journal of neurophysiology

Margolis EB, Hjelmstad GO, Bonci A, Fields HL. Both kappa and mu opioid agonists inhibit glutamatergic input to ventral tegmental area neurons. J Neurophysiol. 2005 Jun; 93(6):3086-93.

2004
http://profiles.ucsf.edu/profile/321368
15615834

Margolis EB, Hjelmstad GO, Bonci A, Fields HL