Presynaptic G Protein-Coupled Receptors: Gatekeepers of Addiction?

被引:38
作者
Johnson, Kari A. [1 ]
Lovinger, David M. [1 ]
机构
[1] NIAAA, Sect Synapt Pharmacolocy, Lab Integrat Neurosci, NIH, Bethesda, MD 20892 USA
基金
美国国家卫生研究院;
关键词
addiction; self-administration; presynaptic; GPCR; dopamine receptor; CB1; receptor; metabotropic glutamate receptor; allosteric modulator; LONG-TERM DEPRESSION; METABOTROPIC GLUTAMATE RECEPTORS; CANNABINOID CB1 RECEPTOR; VENTRAL TEGMENTAL AREA; POSITIVE ALLOSTERIC MODULATOR; CONDITIONED PLACE PREFERENCE; NICOTINE-SEEKING BEHAVIOR; MGLUR(2/3) AGONIST LY379268; MEDIAL PREFRONTAL CORTEX; NUCLEUS-ACCUMBENS SHELL;
D O I
10.3389/fncel.2016.00264
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Drug abuse and addiction cause widespread social and public health problems, and the neurobiology underlying drug actions and drug use and abuse is an area of intensive research. Drugs of abuse alter synaptic transmission, and these actions contribute to acute intoxication as well as the chronic effects of abused substances. Transmission at most mammalian synapses involves neurotransmitter activation of two receptor subtypes, ligand-gated ion channels that mediate fast synaptic responses and G protein-coupled receptors (GPCRs) that have slower neuromodulatory actions. The GPCRs represent a large proportion of neurotransmitter receptors involved in almost all facets of nervous system function. In addition, these receptors are targets for many pharmacotherapeutic agents. Drugs of abuse directly or indirectly affect neuromodulation mediated by GPCRs, with important consequences for intoxication, drug taking and responses to prolonged drug exposure, withdrawal and addiction. Among the GPCRs are several subtypes involved in presynaptic inhibition, most of which are coupled to the G(i/o), class of G protein. There is increasing evidence that these presynaptic G(i/o)-coupled GPCRs have important roles in the actions of drugs of abuse, as well as behaviors related to these drugs. This topic will be reviewed, with particular emphasis on receptors for three neurotransmitters, Dopamine (DA; D-1 and D-2 -like receptors), Endocannabinoids (eCBs; CB1 receptors) and glutamate (group II metabotropic glutamate (mGlu) receptors). The focus is on recent evidence from laboratory animal models (and some evidence in humans) implicating these receptors in the acute and chronic effects of numerous abused drugs, as well as in the control of drug seeking and taking. The ability of drugs targeting these receptors to modify drug seeking behavior has raised the possibility of using compounds targeting these receptors for addiction pharmacotherapy. This topic is also discussed, with emphasis on development of mGlu(2) positive allosteric modulators (PAMs).
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页数:22
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