The difference in cocaine response was, if anything, more pronounced in female mice from A1R KO genotype than in the WT group of the same sex (Ha, accumulated beam breaks from 46 135 min after cocaine injection: WT 51.6±3.7, n = 12, A1R KO: 71.6±6.9, n = 4, p = 0.009, df = 14 Student's t test), in part as a consequence of a higher basal activity (Figure 3B).
Another important observation was that although 300 nM isradipine modified the cocaine response, it did not significantly reduce basal pacemaker frequency or its precision in juvenile or adult SN DA neurons (Fig. 4D and E, and Supplementary Table 5).
Instead the aim was to use the genetic model to try to elucidate whether the enhancement of cocaine responses in the offspring was due to a primary effect on the mother or the fetus/pup.
Words such as cocaine, brain, response, behavior, kg, mg, reinforce and nach prove this.
The 8-OHDPAT treatments, however, did not enhance all cocaine behavioral responses.
Intermittent mild footshock punishment of the cocaine-seeking response was then introduced.
Responding for sucrose allowed for the assessment of general suppression of appetitive behaviour by, and thus the specificity of the effects of, the subsequent introduction of intermittent punishment of the cocaine-seeking response.
In further exploring cocaine users' responses to food stimuli, we observed significant relationships between disgust-induced decrease in SCRs and overall IL-6 levels (r = −.43, p <.05) and between disgust-induced change in response latency and the frequency of cocaine use (Spearmen's r =.61, p <.001).
This has been modelled in rats with procedures whereby, in order for them to self-administer cocaine, seeking responses must be made despite the threat of (Vanderschuren & Everitt, 2004) or actual punishment of seeking (Pelloux et al., 2007, 2012) or taking (Deroche-Gamonet et al., 2004) responses.
Furthermore, central β-adrenoceptors may be responsible for the reported effects of intravenous propranolol on cocaine-induced responses.
However, at the intermediate stage of training, cocaine-seeking responses were decreased by DLS dopamine receptor blockade specifically in LI but not HI rats.
