| Entry |
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| Name |
Alcoholism
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| Description |
Alcoholism, also called dependence on alcohol (ethanol), is a chronic relapsing disorder that is progressive and has serious detrimental health outcomes. As one of the primary mediators of the rewarding effects of alcohol, dopaminergic ventral tegmental area (VTA) projections to the nucleus accumbens (NAc) have been identified. Acute exposure to alcohol stimulates dopamine release into the NAc, which activates D1 receptors, stimulating PKA signaling and subsequent CREB-mediated gene expression, whereas chronic alcohol exposure leads to an adaptive downregulation of this pathway, in particular of CREB function. The decreased CREB function in the NAc may promote the intake of drugs of abuse to achieve an increase in reward and thus may be involved in the regulation of positive affective states of addiction. PKA signaling also affects NMDA receptor activity and may play an important role in neuroadaptation in response to chronic alcohol exposure.
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| Class |
Human Diseases; Substance dependence
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| Pathway map |

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| Other DBs |
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| Orthology |
| | | aromatic-L-amino-acid decarboxylase [EC: 4.1.1.28] | | MFS transporter, DHA1 family, solute carrier family 18 (vesicular amine transporter), member 1/2 | | | | solute carrier family 6 (neurotransmitter transporter, dopamine) member 3 | | glutamate receptor ionotropic, NMDA 1 | | glutamate receptor ionotropic, NMDA 2A | | glutamate receptor ionotropic, NMDA 2B | | glutamate receptor ionotropic, NMDA 2C | | glutamate receptor ionotropic, NMDA 2D | | glutamate receptor ionotropic, NMDA 3A | | glutamate receptor ionotropic, NMDA 3B | | | | | | | | | | | | | | | | | | histone H2A | | histone H2B | | histone H3 | | histone H4 | | histone acetyltransferase 1 [EC: 2.3.1.48] | | dopamine receptor D1 | | guanine nucleotide-binding protein G(s) subunit alpha | | dopamine receptor D2 | | guanine nucleotide-binding protein G(i) subunit alpha | | guanine nucleotide-binding protein G(o) subunit alpha | | guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 | | guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-2 | | guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-3 | | guanine nucleotide-binding protein subunit beta-4 | | guanine nucleotide-binding protein subunit beta-5 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-3 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-4 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-5 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-7 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-8 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-10 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-11 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-12 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-13 | | guanine nucleotide-binding protein G(T) subunit gamma-T1 | | guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-T2 | | adenosine receptor A2a | | adenosine receptor A2b | | | | cyclic AMP-responsive element-binding protein 1 | | cyclic AMP-dependent transcription factor ATF-2 | | cyclic AMP-dependent transcription factor ATF-4 | | cyclic AMP-responsive element-binding protein 3 | | cyclic AMP-responsive element-binding protein 5 | | cyclic AMP-dependent transcription factor ATF-6 beta | | corticotropin-releasing hormone | | neuropeptide Y | | brain-derived neurotrophic factor | | neurotrophic tyrosine kinase receptor type 2 [EC: 2.7.10.1] | | src homology 2 domain-containing transforming protein C | | growth factor receptor-binding protein 2 | | son of sevenless | | GTPase HRas | | GTPase KRas | | GTPase NRas | | A-Raf proto-oncogene serine/threonine-protein kinase [EC: 2.7.11.1] | | B-Raf proto-oncogene serine/threonine-protein kinase [EC: 2.7.11.1] | | RAF proto-oncogene serine/threonine-protein kinase [EC: 2.7.11.1] | | mitogen-activated protein kinase kinase 1 [EC: 2.7.12.2] | | extracellular signal-regulated kinase 1/2 [EC: 2.7.11.24] | | prodynorphin | | calmodulin | | calcium/calmodulin-dependent protein kinase kinase [EC: 2.7.11.17] | | calcium/calmodulin-dependent protein kinase IV [EC: 2.7.11.17] | | protein FosB | | protein phosphatase 1 regulatory subunit 1B | | protein phosphatase 1, catalytic subunit [EC: 3.1.3.16] | | cAMP-dependent protein kinase inhibitor alpha |
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| Compound |
| L-Glutamate | | Hydrogen peroxide | | Calcium cation | | L-Tyrosine | | Adenosine | | 3,4-Dihydroxy-L-phenylalanine | | Ethanol | | 3',5'-Cyclic AMP | | 3,4-Dihydroxyphenylacetate | | Dopamine |
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| Reference |
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| Authors |
Spanagel R |
| Title |
Alcoholism: a systems approach from molecular physiology to addictive behavior. |
| Journal |
Physiol Rev 89:649-705 (2009) |
| Reference |
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| Authors |
Newton PM, Messing RO |
| Title |
Intracellular signaling pathways that regulate behavioral responses to ethanol. |
| Journal |
Pharmacol Ther 109:227-37 (2006) |
| Reference |
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| Authors |
Mailliard WS, Diamond I |
| Title |
Recent advances in the neurobiology of alcoholism: the role of adenosine. |
| Journal |
Pharmacol Ther 101:39-46 (2004) |
| Reference |
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| Authors |
Ron D, Jurd R |
| Title |
The "ups and downs" of signaling cascades in addiction. |
| Journal |
Sci STKE 2005:re14 (2005) |
| Reference |
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| Authors |
Diana M, Brodie M, Muntoni A, Puddu MC, Pillolla G, Steffensen S, Spiga S, Little HJ |
| Title |
Enduring effects of chronic ethanol in the CNS: basis for alcoholism. |
| Journal |
Alcohol Clin Exp Res 27:354-61 (2003) |
| Reference |
|
| Authors |
Moonat S, Starkman BG, Sakharkar A, Pandey SC |
| Title |
Neuroscience of alcoholism: molecular and cellular mechanisms. |
| Journal |
Cell Mol Life Sci 67:73-88 (2010) |
| Reference |
|
| Authors |
Pandey SC |
| Title |
The gene transcription factor cyclic AMP-responsive element binding protein: role in positive and negative affective states of alcohol addiction. |
| Journal |
Pharmacol Ther 104:47-58 (2004) |
| Reference |
|
| Authors |
Zhang TA, Maldve RE, Morrisett RA |
| Title |
Coincident signaling in mesolimbic structures underlying alcohol reinforcement. |
| Journal |
Biochem Pharmacol 72:919-27 (2006) |
| Reference |
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| Authors |
Maldve RE, Zhang TA, Ferrani-Kile K, Schreiber SS, Lippmann MJ, Snyder GL, Fienberg AA, Leslie SW, Gonzales RA, Morrisett RA |
| Title |
DARPP-32 and regulation of the ethanol sensitivity of NMDA receptors in the nucleus accumbens. |
| Journal |
Nat Neurosci 5:641-8 (2002) |
| Reference |
|
| Authors |
Lovinger DM |
| Title |
NMDA receptors lose their inhibitions. |
| Journal |
Nat Neurosci 5:614-6 (2002) |
| Reference |
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| Authors |
Hyman SE, Malenka RC, Nestler EJ |
| Title |
Neural mechanisms of addiction: the role of reward-related learning and memory. |
| Journal |
Annu Rev Neurosci 29:565-98 (2006) |
| Reference |
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| Authors |
Berke JD, Hyman SE |
| Title |
Addiction, dopamine, and the molecular mechanisms of memory. |
| Journal |
Neuron 25:515-32 (2000) |
| Reference |
|
| Authors |
Clapp P, Bhave SV, Hoffman PL |
| Title |
How Adaptation of the Brain to Alcohol Leads to Dependence: A Pharmacological Perspective. |
| Journal |
Alcohol Res Health 31:310-339 (2008) |
| Reference |
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| Authors |
Jeanes ZM, Buske TR, Morrisett RA |
| Title |
In vivo chronic intermittent ethanol exposure reverses the polarity of synaptic plasticity in the nucleus accumbens shell. |
| Journal |
J Pharmacol Exp Ther 336:155-64 (2011) |
| Reference |
|
| Authors |
Lee AM, Messing RO |
| Title |
Protein kinases and addiction. |
| Journal |
Ann N Y Acad Sci 1141:22-57 (2008) |
| Reference |
|
| Authors |
Repunte-Canonigo V, Lutjens R, van der Stap LD, Sanna PP |
| Title |
Increased expression of protein kinase A inhibitor alpha (PKI-alpha) and decreased PKA-regulated genes in chronic intermittent alcohol exposure. |
| Journal |
Brain Res 1138:48-56 (2007) |
| Reference |
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| Authors |
Logrip ML, Janak PH, Ron D |
| Title |
Dynorphin is a downstream effector of striatal BDNF regulation of ethanol intake. |
| Journal |
FASEB J 22:2393-404 (2008) |
| Reference |
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| Authors |
Shukla SD, Velazquez J, French SW, Lu SC, Ticku MK, Zakhari S |
| Title |
Emerging role of epigenetics in the actions of alcohol. |
| Journal |
Alcohol Clin Exp Res 32:1525-34 (2008) |
| Reference |
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| Authors |
Pascual M, Boix J, Felipo V, Guerri C |
| Title |
Repeated alcohol administration during adolescence causes changes in the mesolimbic dopaminergic and glutamatergic systems and promotes alcohol intake in the adult rat. |
| Journal |
J Neurochem 108:920-31 (2009) |
| Reference |
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| Authors |
Li J, Cheng Y, Bian W, Liu X, Zhang C, Ye JH |
| Title |
Region-specific induction of FosB/DeltaFosB by voluntary alcohol intake: effects of naltrexone. |
| Journal |
Alcohol Clin Exp Res 34:1742-50 (2010) |