Trends in Pharmacological Sciences
ReviewA ‘crash’ course on psychostimulant withdrawal as a model of depression
Section snippets
Psychostimulant withdrawal in humans
In general, both cocaine and amphetamines increase alertness, concentration and energy when taken in lower doses, whereas higher doses of these compounds produce additional euphorigenic effects that often are described as a ‘high’ or ‘rush’ [9]. These pleasurable effects decline rapidly, within minutes in the case of cocaine [10] or over a period of several hours in the case of d-amphetamine [11], depending partly on the route of self-administration. As the rewarding properties of the drug
Psychostimulant withdrawal and ‘depressive-like’ symptoms
The features of psychostimulant withdrawal bear remarkable similarity to the symptoms of unipolar depression; indeed, the semblance can be so great that the clinician might have to differentiate between the two based solely on the suspected etiology of the condition [20]. A comparison of the effects of psychostimulant withdrawal with the DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition) diagnostic criteria for MDD, independent of symptom duration, shows that almost
Psychostimulant withdrawal as a model of depression
The similarity of psychostimulant withdrawal and depressive symptoms evident in MDD in humans provides the foundation for the development of an animal model of depressive symptomatology, in which valid comparisons can be made between the behavioral, physiological and pharmacological aspects of psychostimulant withdrawal in animals and humans. Rodents self-administer similar drugs of abuse as do humans [21]. Through the use of sophisticated behavioral paradigms, it has been shown that rodents
Physiological effects of psychostimulant withdrawal
In addition to the behavioral similarities between psychostimulant withdrawal in rodents and symptoms of MDD in humans, there are also significant physiological parallels between the two situations. Numerous studies examining the neurochemical alterations associated with cocaine withdrawal, using in vivo techniques, have shown reduced extracellular levels of dopamine in limbic nuclei, such as the NAcc, during cocaine withdrawal [41], although equivocal findings in this region have been reported
Pharmacological treatment of psychostimulant withdrawal
One of the primary purposes of animal models of depression, particularly for the pharmaceutical industry, is the identification of compounds with antidepressant properties. For a model to serve this function successfully, it must respond to drugs that exhibit antidepressant effects in humans, and hence display ‘pharmacological validity’ 22., 23., 40.. The model ideally should respond to all classes of compounds [such as tricyclic drugs, monoamine oxidase inhibitors and selective 5-HT reuptake
Limitations of the model
Although recent advances in the development of the psychostimulant withdrawal model indicate substantial scientific potential for this paradigm, this model also has several inherent limitations. It should be noted that the transient nature of psychostimulant withdrawal in rodents, with effects typically observable for less than one week (and hence a narrow window for therapeutic intervention), might pose a theoretical challenge to the detection of novel antidepressant compounds because of the
Concluding remarks
The withdrawal from large doses of psychostimulant drugs in humans generates a syndrome with striking behavioral and physiological parallels to MDD. These effects have been modeled successfully in rodent paradigms, in which animals display reliable and highly reproducible behavioral and physiological alterations following withdrawal from both cocaine and amphetamines, although the effects on affective indices of withdrawal from other psychostimulants, such as MDMA, remain to be determined.
Acknowledgements
This work is supported by NIDA grant DA11946, NIMH grant MHS62527 and a Novartis Pharma AG Research grant to A.M., and a grant from the Canadian Institutes for Health Research to A.G.P. We would like to thank John F. Cryan, Novartis Pharma AG for his helpful comments on the manuscript. We would also like to thank Patricia Di Ciano, Dept of Experimental Psychology, University of Cambridge, and Pornnarin Taepavarapruk, Dept of Psychiatry, University of British Columbia for their contribution of
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