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Published on: July 16, 2009
Lack of platelet monoamine oxidase activity in Cebus monkeys (Cebus albifrons)
R Heintz1, M A Richardson, A S Perumal
1Dept. of Psychiatry, Oregon Health Sciences University, Portland.
Abstract:
1. Recent evidence suggests that monoamine oxidase (MAO) plays an important role modulating the extrapyramidal syndromes produced by neuroleptic drugs in both human and nonhuman primates. 2. To evaluate the possibility of using peripheral blood platelet MAO-B levels as indices of central nervous system MAO-B effects, we measured platelet MAO-B levels in Cebus monkeys that were previously tested with neuroleptics (N = 36) or drug naive (N = 6). 3. No platelet MAO-B was consistently detectable in these blood samples. 4. Thus platelet measures of MAO-B do not reliably reflect brain MAO-B function in nonhuman primates and do not offer a useful model for studying blood-brain MAO-B relationships.
Insights
Platelet monoamine oxidase-B (MAO-B) levels do not reliably indicate central nervous system MAO-B activity in nonhuman primates. This finding limits the use of platelet MAO-B as a model for studying neuroleptic drug effects.
Area of Science:
- Neuroscience
- Pharmacology
- Primate Research
Background:
- Monoamine oxidase (MAO) is implicated in modulating extrapyramidal syndromes caused by neuroleptic drugs.
- Understanding central nervous system (CNS) MAO activity is crucial for neuroleptic drug research.
Purpose of the Study:
- To investigate if peripheral blood platelet monoamine oxidase-B (MAO-B) levels can serve as reliable indicators of central MAO-B effects in nonhuman primates.
- To assess the utility of platelet MAO-B as a biomarker for CNS MAO-B function.
Main Methods:
- Platelet MAO-B levels were measured in Cebus monkeys.
- Monkeys included those previously treated with neuroleptics (N=36) and drug-naive individuals (N=6).
Main Results:
- Consistent detection of platelet MAO-B was not achieved in the analyzed blood samples.
- The study found no reliable correlation between peripheral platelet MAO-B levels and central MAO-B function.
Conclusions:
- Platelet MAO-B measurements are not a valid surrogate for assessing brain MAO-B function in nonhuman primates.
- This study does not support the use of platelet MAO-B as a model for investigating blood-brain MAO-B relationships in primate models.
