Abstract：
BACKGROUND:Because methamphetamine (METH) pharmacokinetics after single iv doses show significant differences between male and female rats, we hypothesized that pharmacokinetic differences in METH disposition could be a contributing factor to the patterns of METH self-administration behaviors in rats. METHODS:For the studies, we used a passive (non-contingent) METH dosing schedule consisting of 27 METH iv bolus injections (0.048mg/kg) over 2h derived from a previous active (contingent) METH self-administration behavioral study in male rats. After METH dosing of male and female Sprague-Dawley rats (n=5/group), METH and amphetamine serum concentrations were determined by LC-MS/MS. Pharmacokinetic analysis, including predictive mathematical simulations of the data, was then conducted. RESULTS:Male and female rats achieved relatively stable METH serum concentrations within 20min, which remained constant from 20 to 120min. While not statistically different, METH clearance and volume of distribution values for females were 25% and 33% lower (respectively) than males. Linear regression analysis of predicted METH concentrations from pharmacokinetic simulations versus observed concentrations showed a substantially better correlation with male data than female data (r(2)=0.71 vs. 0.56; slope=0.95 vs. 0.45, respectively). At 120min, the time of predicted peak METH serum concentrations, female values were 42% higher than expected, while male values were within 3%. CONCLUSIONS:Unlike METH male pharmacokinetic data, the female data was less predictable during multiple METH administrations and produced overall higher than expected METH concentrations. These findings demonstrate that METH pharmacokinetics could contribute to differences in METH self-administration behaviors in rats.
journal_name
Drug Alcohol Dependjournal_title
Drug and alcohol dependenceauthors
Milesi-Hallé A,Hambuchen MD,McMillan DE,Michael Owens Sdoi
10.1016/j.drugalcdep.2015.02.032subject
Has Abstractpub_date
2015-05-01 00:00:00pages
164-9eissn
0376-8716issn
1879-0046pii
S0376-8716(15)00134-9journal_volume
150pub_type
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