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Topic: Mesolimbic pathway

Related Topics

Nigrostriatal pathway

Tuberoinfundibular pathway

Mesocortical pathway

Ventral tegmentum

Dopamine

Dopamine hypothesis of psychosis

Nucleus accumbens

Antipsychotic

Substance abuse

Frontal lobe

Psychosis

Addiction

Avolition

Emotion

Neurotransmitter

	Mesolimbic pathway - Open Encyclopedia (Site not responding. Last check: 2007-11-06)
		The mesolimbic pathway is one of the neural pathways in the brain which links the ventral tegmentum area in the midbrain to the nucleus accumbens in the limbic system.
		It is one of the four major pathways where the neurotransmitter dopamine is found.
		The mesolimbic pathway is one of the major pathways targeted by antipsychotic medication.
	www.open-encyclopedia.com /Mesolimbic_pathway (161 words)

	Dopaminergic pathways - Freepedia (Site not responding. Last check: 2007-11-06)
		The mesocortical pathway transmits dopamine from the VTA to the frontal cortex.
		The nigrostriatal pathway transmits dopamine from the substantia nigra to the striatum.
		The tuberoinfundibular pathway transmits dopamine from the hypothalamus to the pituitary gland.
	en.freepedia.org /Dopaminergic_pathways.html (257 words)

	Neural pathway \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-11-06)
		A neural pathway is a neural tract connecting one part of the nervous system with another, usually consisting of bundles of elongated, myelin insultated neurons, known collectively as white matter.
		The first named pathways were evident even in a poorly-preserved gross brain, and were named by the great anatomists of the Renaissance using cadaver material.
		For example, the nigrostriatal pathway, which is degenerated in Parkinson's disease, runs from the substantia nigra (Latin, "fl substance") to the corpus striatum (Latin, "striped body").
	www.tutorgig.co.uk /ed/Neural_pathway (526 words)

	nigrostriatal pathway (Site not responding. Last check: 2007-11-06)
		The nigrostriatal pathway is a neural pathway which connects the substantia nigra with the striatum.
		This pathway is also implicated in producing tardive dyskinesia, one of the side effects of antipsychotic drugs.
		The desired clinical effect of reducing psychotic symptoms is thought to be associated with blocking dopamine function in the mesolimbic pathway only.
	www.yourencyclopedia.net /nigrostriatal_pathway.html (245 words)

	Encyclopedia: Dopamine (Site not responding. Last check: 2007-11-06)
		As a member of the catecholamine family, dopamine is a precursor to epinephrine (adrenaline) and norepinephrine (noradrenaline) in the biosynthetic pathways for these neurotransmitters.
		The mesocortical pathway is a neural pathway which connects the ventral tegmentum to the cortex, particularly the frontal lobes.
		Dopamine neurons in the mesolimbic pathway are particularly associated with these conditions.
	www.nationmaster.com /encyclopedia/Dopamine (4222 words)

	THE BRAIN FROM TOP TO BOTTOM
		The mesolimbic pathway is important for memory and for motivating behaviours.
		Degeneration of the neurons in this pathway is associated with the trembling and muscular rigidity symptomatic of Parkinson’s disease.
		A fourth dopaminergic pathway worth mentioning is the tuberoinfundibular pathway, which connects the hypothalamus to the pituitary gland, where it influences the secretion of hormones such as prolactin.
	thebrain.mcgill.ca /flash/a/a_03/a_03_cl/a_03_cl_que/a_03_cl_que.html (222 words)

	[No title]
		Another output from the VP is a pathway to the PPTg, a brain area that could further mediate the information from forebrain structures to the spinal cord and modulate the motor behaviour (Mogenson 1987).
		It is known that the role of these pathways in the regulation of behaviour is different and that each subsystem also has several functions, at least partly depending on the functional role of the neuronal systems they interact with (Amalric and Koob 1993; Le Moal and Simon 1991; Robbins and Everitt 1996; White 1989).
		Serotonin (5-HT) is an indolamine monoamine neurotransmitter synthesized by a pathway analogous to that of the catecholamines.
	www.cellscience.com /CCA.htm (9601 words)

	Dopamine and transporter
		"Preferential alterations in the mesolimbic dopamine pathway of heterozygous reeler mice: an emerging animal-based model of schizophrenia." Eur J Neurosci 15(7): 1197-205.
		As brain mesolimbic dopamine pathways have been proposed to be associated with the pathophysiology of psychotic disorders, we thought it would be of interest to examine whether these animals present disturbances in the mesolimbic dopamine system.
		On the contrary, the nigrostriatal pathway did not show any significant alteration in heterozygous reeler mice with regards to the dopaminergic markers examined in substantia nigra cell bodies and dorsal striatum dopamine terminal fields.
	lansbury.bwh.harvard.edu /dopamine_and_transporter.htm (18871 words)

	Effects of Nicotine on the Brain (Site not responding. Last check: 2007-11-06)
		This system is the same pathway that creates the intense cravings to indulge in certain foods or activities, such as sex.
		When the mesolimbic pathway is stimulated, the neurons secrete dopamine.
		Nicotine, like that of cocaine, causes the mesolimbic system to project from the ventral tegmental area of the midbrain to the nucleus accumbens.
	student.biology.arizona.edu /honors96/group7/studies.htm (609 words)

	Neurobiology of schizophrenia
		The general view for some time has been that the positive symptoms are related to overactivity of the mesolimbic dopamine pathway, whereas the negative symptoms are related to alterations in the dorsolateral prefrontal cortex and other neurotransmitter systems.
		mesocortical pathway, which projects from the brainstem (midbrain) areas to the cortex, particularly the prefrontal cortex which is involved in the temporal organization of behavior, in motivation, planning, attention and social behavior.
		Thus, the behavioral effects of PCP may be due in part to its ability to enhance DA release in the mesolimbic pathway while blocking DA release in the mesocortical pathway.
	www.sci.sdsu.edu /classes/psychology/psy760/schizo.htm (3825 words)

	Dopamine (Site not responding. Last check: 2007-11-06)
		As a member of the catecholamine family, dopamine is a precurser to epinephrine (adrenaline) and norepinephrine (noradrenaline) in the biosynthetic pathways for these neurotransmitters.
		Certainly dopamine is released (particularly in areas such as the nucleus accumbens and striatum) by naturally rewarding experiences such as food, sex, drugs of abuse and neutral stimuli that become associated with them.
		This theory is often discussed in terms of drugs (such as cocaine) which seem to directly produce dopamine release in these areas, and in relation to neurobiological theories of addiction, which argue that these dopamine pathways are pathologically altered in addicted persons.
	www.brainyencyclopedia.com /encyclopedia/d/do/dopamine.html (734 words)

	drug of abuse.html (Site not responding. Last check: 2007-11-06)
		In the nucleus accumbens adaptations in the cAMP pathway and regulation of transcription factors (increase in the expression of c-fos, c-jun, zif268 or related immediate early genes and increase in AP-1 binding activity) is well established in acute drug administration, whereas chronic treatment abolishes some of these abilities.
		The mesolimbic DA system is implicated in the reinforcing effects of drugs of abuse (Sklair-Tavron et al, 1996, Abbott, 1992, Stolerman I, 1992, DiChiara G.and North, 1992, Kiyatkin, 1994).
		DA neurons in turn are preferentially activated in the ventral tegmental area compared to the substantia nigra pars compacta (Pollock, 1989, Olds, 1982, Goeders, 1984, Borekkamp 1979), providing evidence that DA in general and the DA input to the nucleus accumbens in particular, plays an important role in the motor stimulant properties of opiates.
	www.unifr.ch /biochem/DREYER/drabuse.html (1581 words)

	Dopamine and tyrosine hydroxylase
		We found that Arix is constitutively phosphorylated in vivo at the basal level and that the phosphorylation level is substantially decreased upon stimulation of the PKA pathway.
		This normal daytime decrease in MBP and HR was disturbed by inducing a lesion of the ventral tegmental area (VTA) DA neurons, although the rhythms of wake-sleep duration and behavioral activity remained relatively intact.
		The mesolimbic dopamine system has been intensely studied as the neural circuit mediating the locomotor response to psychostimulants and behavioral sensitization.
	lansbury.bwh.harvard.edu /dopamine_and_tyrosine_hydroxylase.htm (18150 words)

	Genetic Influences on Smoking: Candidate Genes (Site not responding. Last check: 2007-11-06)
		Important aspects of the dopaminergic pathway include synthesis of dopamine in dopaminergic neurons, release of dopamine by presynaptic neurons, receptor activation of postsynaptic neurons, dopamine re-uptake by presynaptic neurons, and metabolism of released dopamine.
		Pathways of this system, which originate in the ventral tegmental area (VTA) and travel primarily to the nucleus accumbens (NA), are composed of dopaminergic neurons.
		Important components of the dopaminergic pathway include 1) synthesis of dopamine in dopaminergic neurons; 2) release of dopamine by presynaptic neurons; 3) receptor activation of postsynaptic neurons; 4) dopamine re-uptake by the presynaptic neuron, and 5) metabolism of released dopamine.
	ehp.niehs.nih.gov /members/1998/106p231-238rossing/rossing-full.html (8371 words)

	NIDA - Diagnosis and Treatment of Drug Abuse in Family Practice - Pathophysiology
		One specific mesolimbic "reward pathway" has been identified in the brain [31], and others may exist.
		The long-term cellular changes engendered by this recurring process seem to interact with the reinforcement pathways through mechanisms that include the endogenous opioid systems, since craving for alcohol can be at least partially blocked by the opiate antagonist naltrexone (Trexan).
		Physical dependence and withdrawal syndromes are mediated by separate anatomical pathways and are now understood not to be a central feature of addiction.
	www.nida.nih.gov /Diagnosis-Treatment/Diagnosis4.html (710 words)

	Mesolimbic pathway (Site not responding. Last check: 2007-11-06)
		The mesolimbic pathway is one of the neuralpathways in the brain which links the ventral tegmentum area in the midbrain to the nucleus accumbens in the limbic system.
		It is thought to be involved in producing pleasurable feeling and is often associated with feelings of reward and desire,particularly because of the connection to the nucleus accumbens which has also been associated with these states.
		Successful antipsychoticmedication is therefore thought to have its effect by blocking dopamine receptors in this pathway.
	www.therfcc.org /mesolimbic-pathway-94917.html (175 words)

	Recognized HTML document
		In the present study we sought to determine whether mesolimbic dopamine neurons are involved in the neurobiologic mechanisms underlying withdrawal from chronic cannabinoid exposure.
		The mesolimbic dopamine (DA) system, aside from its recognized role in the acute rewarding effects of addictive substances, has recently been implicated in the long-term aversive consequences of spontaneous and drug-induced withdrawal from major drugs of abuse such as ethanol, morphine and cocaine (11, 12).
		In line with this, it was found that the spontaneous activity of DA neurons of the meso-accumbens pathway is reduced after withdrawal from chronic administration of ethanol (18), and morphine (19), and that the reduction in their activity persists after somatic withdrawal has subsided (12, 20).
	www.drugtext.org /library/research/cannabis/behavior/behavior06/behavior06_Dir/behavior06_Page1.htm (2928 words)

	Cannabinoid activity curtails cocaine craving - Nature Medicine
		Regardless of the stimulus, relapses are accompanied by increased activity of the mesolimbic dopamine system—a neural pathway comprising a small group of dopamine-releasing cells in the midbrain connected to a much larger field of dopamine-responsive neurons in the forebrain's nucleus accumbens and prefrontal cortex (Fig.
		This pathway is thought to be activated in behaviors such as eating and mating, and to underlie the rewarding properties of many psychoactive drugs, but its exact role in drug craving and relapse is only partially understood.
		This neuromodulatory pathway projects from the ventral tegmental area (VTA) in the midbrain to the nucleus accumbens and the prefrontal cortex.
	www.nature.com /cgi-taf/DynaPage.taf?file=/nm/journal/v7/n10/full/nm1001-1099.html (1136 words)

	Zoology 214 Lecture 19: October 1, 2001 (Site not responding. Last check: 2007-11-06)
		Mesolimbic dopaminergic system has origin in ventral tegmentum and projects to the nucleus accumbens (ventral striatum)
		Parkinson's is caused by the death of some of the dopamine neurons in the nigrostriatal pathway
		Nigrostriatal pathway originates in the substantia nigra and terminates in the caudate nucleus (Fig.
	www.humboldt.edu /~bao3/214lectures/214Lecture19.htm (406 words)

	How THC Affects The Brain
		The psychoactive cannabinoids increase the activity of dopaminergic neurons in the ventral tegmental area-mesolimbic pathway.
		Since these dopaminergic circuits are known to play a pivotal role in mediating the reinforcing (rewarding) effects of the most drugs of abuse, the enhanced dopaminergic drive elicited by the cannabinoids is thought to underlie the reinforcing and abuse properties of marijuana.
		Cannabis sativa, the marijuana plant has been used for many years for recreational and therapeutic applications, although the mechanisms through which extracts of the Cannabis plant brought about their actions were obscure.
	www.a1b2c3.com /drugs/brn005.htm (961 words)

	Dopamine and substantia nigra
		"Preferential alterations in the mesolimbic dopamine pathway of heterozygous reeler mice: an emerging animal-based model of schizophrenia." Eur J Neurosci 15(7): 1197-1205.
		Sprouting of the lesioned axons was observed along the nigrostriatal pathway, precisely corresponding to the areas containing anterogradely transported GDNF.
		Evidence suggests that terminals of mesocortical, mesolimbic and nigrostriatal dopaminergic neurons of SHR release less dopamine in response to electrical stimulation and/or depolarization as a result of exposure to high extracellular K(+) concentrations, than WKY.
	lansbury.bwh.harvard.edu /da_and_substantia_nigra.htm (17143 words)

	CRISP - Computer Retrieval of Information on Scientific Projects, Abstract Display (Site not responding. Last check: 2007-11-06)
		Since the 1980's it has been known that the habenulo-interpeduncular pathway functions as a reward system that is separate from the mesolimbic pathway.
		The goal of this proposal is to examine the role of cholinergic mechanisms in the habenulo-interpeduncular pathway as a potential substrate for new treatments.
		Activation of the cholinergic habenulo-interpeduncular pathway may be an alternate or supplementary mechanism mediating or modulating the rewarding effects of drugs of abuse.
	crisp.cit.nih.gov /crisp/CRISP_LIB.getdoc?textkey=6817626&p_grant_num=1R01DA016283-01A2&p_query=&ticket=10744289&p_audit_session_id=49492089&p_keywords= (344 words)

	Jordi Ortiz, Ph.D.<B><BIG> Jordi Ortiz, Ph.D. <P></BIG></B>
		Because this neural pathway is also regulated by stress, and because stress has been shown to influence an animal's behavioral responses to drugs of abuse, it was of interest to determine whether repeated exposure to stress results in similar biochemical adaptations.
		Since this neural pathway is also implicated in the reinforcing actions of ethanol, it was of interest to determine whether chronic ethanol exposure results in similar biochemical adaptations.
		These results demonstrate that chronic ethanol exposure results in several biochemical adaptations in the mesolimbic dopamine system, which may underlie prominent changes in the structural and functional properties of this neural pathway related to alcohol abuse and alcoholism.
	servet.uab.es /jortiz/abuse.html (1889 words)

	Mesolimbic Pathway And Nicotine Addiction
		Also, neurologic pathways other than the mesolimbic pathway may be.
		Genes involved in dopaminergic neurotransmission in the mesolimbic pathway of the.
		.pathway leading to nicotine addiction has been examined in these animals: high affinity nicotine binding is completely absent in the mesolimbic.the pathway toward nicotine addiction.
	www.smoke-away-review.com /stopsmoke/mesolimbic-pathway-and-nicotine-addiction.html (483 words)

	MIDARP at Hunter College
		Therefore, METH offers an important research tool to manipulate dopaninergic pathways and study the normal activities of the brain.
		For example, mechanisms of reward (positive reinforcement) are likely to be understood by repetitive release of dopamine, especially in the mesolimbic dopaminergic pathway form the ventral tegmental area to the nucleus accumbens.
		By augmenting synaptic dopamine in the positive reinforcement centers of the brain, namely the mesolimbic system, METH affords the neuroscientist a tool to study the normal activities of the reward system of the mammalian brain.
	maxweber.hunter.cuny.edu /psych/midarp/project1.htm (826 words)

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