Appropriate dosing regimens for treating juvenile rats with desipramine for neuropharmacological and behavioral studies

The tricyclic antidepressants, including desipramine (DMI), are no better than placebo in treating childhood and adolescent depression, but are effective in adult depression. Animal studies comparing the effects of DMI in juveniles and adults are complicated by age-related variations in elimination...

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Veröffentlicht in:Journal of neuroscience methods 2007-06, Vol.163 (1), p.83-91
Hauptverfasser: Kozisek, Megan E., Deupree, Jean D., Burke, William J., Bylund, David B.
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container_title Journal of neuroscience methods
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creator Kozisek, Megan E.
Deupree, Jean D.
Burke, William J.
Bylund, David B.
description The tricyclic antidepressants, including desipramine (DMI), are no better than placebo in treating childhood and adolescent depression, but are effective in adult depression. Animal studies comparing the effects of DMI in juveniles and adults are complicated by age-related variations in elimination rates. Thus, different dosing regiments are needed to achieve similar brain drug levels in juvenile and adult rats. We compared the half-life of DMI as well as the brain and serum concentrations of DMI and its active metabolite desmethyldesipramine in juvenile and adult rats after various drug administration paradigms. After acute i.p. administration DMI is eliminated from the brain more slowly in postnatal day (PND) 21 and 28 rats as compared to adults. After chronic i.p. administration (for 4–5 days between PND 9 and 28), lower doses of DMI are needed with juvenile rats to obtain the same brain DMI concentrations as adults. By contrast, 2 weeks of continuous drug delivery (minipump) to PND 21–35 and adult rats result in similar brain DMI concentrations. Thus, the pharmacokinetic properties of DMI varies with the age of the animal and dosing of DMI and needs to be carefully adjusted in order to have appropriate brain levels of the drug.
doi_str_mv 10.1016/j.jneumeth.2007.02.015
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Animal studies comparing the effects of DMI in juveniles and adults are complicated by age-related variations in elimination rates. Thus, different dosing regiments are needed to achieve similar brain drug levels in juvenile and adult rats. We compared the half-life of DMI as well as the brain and serum concentrations of DMI and its active metabolite desmethyldesipramine in juvenile and adult rats after various drug administration paradigms. After acute i.p. administration DMI is eliminated from the brain more slowly in postnatal day (PND) 21 and 28 rats as compared to adults. After chronic i.p. administration (for 4–5 days between PND 9 and 28), lower doses of DMI are needed with juvenile rats to obtain the same brain DMI concentrations as adults. By contrast, 2 weeks of continuous drug delivery (minipump) to PND 21–35 and adult rats result in similar brain DMI concentrations. 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source MEDLINE; Elsevier ScienceDirect Journals
subjects Adult
Age Factors
Animals
Animals, Newborn
Antidepressant
Antidepressive Agents, Tricyclic - metabolism
Antidepressive Agents, Tricyclic - pharmacokinetics
Behavior, Animal - drug effects
Brain - drug effects
Brain - metabolism
Brain Chemistry - drug effects
Chromatography, High Pressure Liquid - methods
Depression
Desipramine
Desipramine - metabolism
Desipramine - pharmacokinetics
Desmethyldesipramine
Dose-Response Relationship, Drug
Drug Administration Schedule
Half-Life
Imipramine - analogs & derivatives
Imipramine - metabolism
Juvenile
Male
Pharmacokinetics
Protein Binding - drug effects
Rats
Rats, Sprague-Dawley
Swimming
Time Factors
title Appropriate dosing regimens for treating juvenile rats with desipramine for neuropharmacological and behavioral studies
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