TY - JOUR
T1 - Loss of BDNF signaling in D1R-expressing NAc neurons enhances morphine reward by reducing GABA inhibition
AU - Koo, Ja Wook
AU - Lobo, Mary Kay
AU - Chaudhury, Dipesh
AU - Labonté, Benoit
AU - Friedman, Allyson
AU - Heller, Elizabeth
AU - Peña, Catherine Jensen
AU - Han, Ming Hu
AU - Nestler, Eric J.
N1 - Publisher Copyright:
© 2014 American College of Neuropsychopharmacology. All rights reserved.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - The nucleus accumbens (NAc) has a central role in the mechanism of action of drugs of abuse. The major neuronal type within the NAc is the GABAergic medium spiny neuron (MSN), with two major subpopulations defined - termed D1-type and D2-type MSNs - based on the predominant dopamine receptor expressed. However, very little is known about the contribution of altered GABAergic function in NAc MSNs to the neural and behavioral plasticity that contributes to the lasting actions of drugs of abuse. In the present study, we show that GABAergic activity is selectively modulated in D1-type MSNs of the NAc by signaling of brain-derived neurotrophic factor (BDNF) and its receptor, tyrosine receptor kinase B (TrkB), and that such adaptations control rewarding responses to morphine. Optical activation of D1-type MSNs, or the knockout of TrkB from D1-type MSNs (D1-TrkB KO), enhances morphine reward, effects not seen for D2-type MSNs. In addition, D1-TrkB KO mice, but not D2-TrkB KO mice, display decreased GABAA receptor (GABAAR) subunit expression and reduced spontaneous inhibitory postsynaptic currents (sIPSCs) in D1-type, but not D2-type, MSNs in the NAc. Furthermore, we found that GABAAR antagonism in the NAc enhances morphine reward and that morphine exposure decreases TrkB expression as well as GABAergic activity in D1-type MSNs. Together, these data provide evidence for the enhancement of morphine reward through reduction of inhibitory GABA A R responses, an adaptation mediated by morphine-induced reduction of BDNF-TrkB signaling in D1-type MSNs.
AB - The nucleus accumbens (NAc) has a central role in the mechanism of action of drugs of abuse. The major neuronal type within the NAc is the GABAergic medium spiny neuron (MSN), with two major subpopulations defined - termed D1-type and D2-type MSNs - based on the predominant dopamine receptor expressed. However, very little is known about the contribution of altered GABAergic function in NAc MSNs to the neural and behavioral plasticity that contributes to the lasting actions of drugs of abuse. In the present study, we show that GABAergic activity is selectively modulated in D1-type MSNs of the NAc by signaling of brain-derived neurotrophic factor (BDNF) and its receptor, tyrosine receptor kinase B (TrkB), and that such adaptations control rewarding responses to morphine. Optical activation of D1-type MSNs, or the knockout of TrkB from D1-type MSNs (D1-TrkB KO), enhances morphine reward, effects not seen for D2-type MSNs. In addition, D1-TrkB KO mice, but not D2-TrkB KO mice, display decreased GABAA receptor (GABAAR) subunit expression and reduced spontaneous inhibitory postsynaptic currents (sIPSCs) in D1-type, but not D2-type, MSNs in the NAc. Furthermore, we found that GABAAR antagonism in the NAc enhances morphine reward and that morphine exposure decreases TrkB expression as well as GABAergic activity in D1-type MSNs. Together, these data provide evidence for the enhancement of morphine reward through reduction of inhibitory GABA A R responses, an adaptation mediated by morphine-induced reduction of BDNF-TrkB signaling in D1-type MSNs.
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U2 - 10.1038/npp.2014.118
DO - 10.1038/npp.2014.118
M3 - Article
C2 - 24853771
AN - SCOPUS:84939893302
SN - 0893-133X
VL - 39
SP - 2646
EP - 2653
JO - Neuropsychopharmacology
JF - Neuropsychopharmacology
IS - 11
ER -