To test the system, the researchers injected rats with a tracer to measure dopamine levels in the brain first in a conventional PET scanner under anesthesia, then wearing RatCAP.
Unfortunately, the small amount of tissue available did not allow us to measure dopamine levels in the striatum of treated mice.
Dr. Kardaras, who grew up playing Asteroids and loved Ms. PacMan, discusses how game developers use tests to measure dopamine and adrenaline levels in order to make video games as addicting as possible.
The key data here date back to the advent of in vivo microdialysis in the 1980s, at which point it became possible to measure extracellular dopamine levels in the nucleus accumbens during exposure to different rewards.
The binding competition between D2/D3 receptor radioligands and endogenous dopamine allows measuring changes in dopamine levels following a pharmacological challenge, for example a psychostimulant.
For the measurement of dopamine levels, the brain tissues were homogenized in perchloric acid (300 μL, 1 M) and isoproterenol (100 pmol, internal standard), and dopamine levels were measured by an HPLC system [ 19].
However, basal in vivo extracellular AcbSh dopamine levels measured using classical microdialysis in fasting rats did not differ between genotypes (Fig. 6D).
To investigate whether expression of human torsinAΔE could also reduce the dopamine pool level, we measured BH4 levels and dopamine levels in extracts from brains of wild type male larvae expressing wild type human torsinA, dtorsin KO13 male larvae expressing human torsinAΔE, and dtorsin KO13 male larvae expressing both human torsinA and human torsinAΔE (Fig. 4A,B).
In contrast a remifentanil infusion has been reported to increase striatal dopamine levels measured with [F]fallypride PET in healthy volunteers and abstinent alcohol-dependent individuals, but there was no relationship to craving (Spreckelmeyer et al. 2011).
