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Role of monoamine oxidase in aminopropionitrile-induced neurotoxicity
1Department of Environmental Health Sciences, School of Public Health, University of California, Los Angeles 90024.
Abstract:
Oxidation of aminopropionitriles was measured in vitro with both rat liver mitochondria and bovine plasma monoamine oxidase (MAO). The nonneurotoxic aminonitrile beta-aminopropionitrile (BAPN) was oxidized at a significantly higher rate (p less than .05) than either of the neurotoxic aminonitriles tested; 3,3'-iminodipropionitrile (IDPN) and 3,3'-dimethylaminopropionitrile (DMAPN). DMAPN was a poor substrate for both mitochondrial and plasma MAO. None of the aminonitriles tested were found to inhibit MAO activity in rat brain or liver in vivo. Inhibition of MAO activity with pargyline in vivo did not affect the pattern of IDPN- or DMAPN-induced toxicity. These results suggest that monoamine oxidase is not involved in aminonitrile-induced neurotoxicity.
Insights
Monoamine oxidase (MAO) does not appear to be involved in aminonitrile neurotoxicity. Studies showed MAO did not metabolize neurotoxic aminonitriles, and MAO inhibition did not alter toxicity patterns.
Area of Science:
- Biochemistry
- Neuroscience
- Toxicology
Background:
- Aminopropionitriles are compounds with potential neurotoxic effects.
- Monoamine oxidase (MAO) is an enzyme involved in neurotransmitter metabolism.
- The role of MAO in aminonitrile-induced neurotoxicity remains unclear.
Purpose of the Study:
- To investigate the in vitro oxidation of aminopropionitriles by MAO.
- To determine if MAO inhibition affects aminonitrile-induced neurotoxicity in vivo.
Main Methods:
- In vitro oxidation assays using rat liver mitochondria and bovine plasma MAO.
- In vivo neurotoxicity studies with aminonitriles and MAO inhibition using pargyline.
Main Results:
- Beta-aminopropionitrile (BAPN) was oxidized significantly faster than neurotoxic 3,3'-iminodipropionitrile (IDPN) and 3,3'-dimethylaminopropionitrile (DMAPN).
- DMAPN was a poor substrate for both mitochondrial and plasma MAO.
- No inhibition of MAO activity was observed in vivo with any tested aminonitriles.
- MAO inhibition in vivo did not alter the toxicity patterns of IDPN or DMAPN.
Conclusions:
- Monoamine oxidase is not involved in the neurotoxicity induced by aminopropionitriles.
- The mechanism of aminonitrile neurotoxicity likely involves pathways independent of MAO activity.