scholarly journals The cholinergic mesopontine tegmentum is a relatively neglected nicotinic master modulator of the dopaminergic system: relevance to drugs of abuse and pathology

2008 ◽  
Vol 153 (S1) ◽  
pp. S438-S445 ◽  
Author(s):  
U Maskos
2009 ◽  
Vol 24 (S1) ◽  
pp. 1-1
Author(s):  
C. Flores

Dysfunctions of the midbrain dopaminergic system are implicated in the psychopathology of schizophrenia and other disorders including drug addiction. Abnormalities in brain development play an etiological role in schizophrenia leading to altered dopaminergic function in adulthood and increased vulnerability to the effects of stimulant drugs. Netrins are proteins that organize neuronal connectivity during development and their receptors are highly expressed in dopaminergic neurons. We find that adult netrin-1 receptor deficient mice exhibit altered dopamine-related behaviors and show profound molecular and anatomical changes in dopamine systems that appear opposite to those observed in developmental animal models of schizophrenia or following chronic use of drugs of abuse. Significantly, the signs of this apparently ‘protective’ phenotype are not evident in pre-pubertal mice. We propose that variations in netrin-1 receptor function at critical periods in development could contribute to individual differences in susceptibility to psychopathology.


2015 ◽  
Vol 20 (3) ◽  
pp. 155-166 ◽  
Author(s):  
Larissa J. Maier ◽  
Michael P. Schaub

Abstract. Pharmacological neuroenhancement, defined as the misuse of prescription drugs, illicit drugs, or alcohol for the purpose of enhancing cognition, mood, or prosocial behavior, is not widespread in Europe – nevertheless, it does occur. Thus far, no drug has been proven as safe and effective for cognitive enhancement in otherwise healthy individuals. European studies have investigated the misuse of prescription and illicit stimulants to increase cognitive performance as well as the use of tranquilizers, alcohol, and cannabis to cope with stress related to work or education. Young people in educational settings report pharmacological neuroenhancement more frequently than those in other settings. Although the regular use of drugs for neuroenhancement is not common in Europe, the irregular and low-dose usage of neuroenhancers might cause adverse reactions. Previous studies have revealed that obtaining adequate amounts of sleep and using successful learning techniques effectively improve mental performance, whereas pharmacological neuroenhancement is associated with ambiguous effects. Therefore, non-substance-related alternatives should be promoted to cope with stressful situations. This paper reviews the recent research on pharmacological neuroenhancement in Europe, develops a clear definition of the substances used, and formulates recommendations for practitioners regarding how to react to requests for neuroenhancement drug prescriptions. We conclude that monitoring the future development of pharmacological neuroenhancement in Europe is important to provide effective preventive measures when required. Furthermore, substance use to cope with stress related to work or education should be studied in depth because it is likely more prevalent and dangerous than direct neuroenhancement.


1993 ◽  
Author(s):  
Mary Ann Wilson ◽  
◽  
Laura A. Mamounas ◽  
Kenneth H. Fasman ◽  
Karen J. Axt ◽  
...  
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