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Qualitative GC-MS assessment of TCP and TAMORF elimination in rats
Maja Jelena Petek1, Ana Lucić Vrdoljak, Gordan Mrsić
1Forensic Science Centre "Ivan Vucetić", Zagreb, Croatia. mpetek@mup.hr
Abstract:
Nerve agents are highly toxic organophosphorus (OP) compounds. They inhibit acetylcholinesterase (AChE), an enzyme that hydrolyses acetycholine (ACh) in the nervous system. Pathophysiological changes caused by OP poisonings are primarily the consequence of surplus ACh on cholinergic receptors and in the central nervous system. Standard treatment of OP poisoning includes combined administration of carbamates, atropine, oximes and anticonvulsants. In order to improve therapy, new compounds have been synthesised and tested. Tenocyclidine (TCP) and its adamantane derivative 1-[2-(2-thienyl)-2-adamantyl] morpholine (TAMORF) have shown interesting properties against soman poisoning. In this study, we developed a qualitative GC-MS method to measure elimination of TCP and TAMORF through rat urine in order to learn more about the mechanisms through which TCP protects an organism from OP poisoning and to determine the duration of this protective effect. GC-MS showed that six hours after treatment with TCP, rat urine contained only its metabolite 1-thienylcyclohexene, while urine of rats treated with TAMORF contained both TAMORF and its metabolites.
Insights
This study investigated the elimination of Tenocyclidine (TCP) and TAMORF in rats following organophosphorus poisoning. GC-MS analysis revealed distinct metabolic profiles, aiding in understanding their protective mechanisms and duration.
Area of Science:
- Toxicology
- Pharmacology
- Analytical Chemistry
Background:
- Organophosphorus (OP) compounds, like nerve agents, are highly toxic due to acetylcholinesterase (AChE) inhibition.
- OP poisoning leads to excess acetylcholine, causing severe pathophysiological changes.
- Current treatments involve carbamates, atropine, oximes, and anticonvulsants, but new therapeutic agents are sought.
Purpose of the Study:
- To develop a qualitative GC-MS method for measuring TCP and TAMORF elimination in rat urine.
- To investigate the pharmacokinetic profiles of TCP and TAMORF.
- To gain insights into the protective mechanisms and duration of action of TCP against OP poisoning.
Main Methods:
- Gas Chromatography-Mass Spectrometry (GC-MS) was employed for qualitative analysis.
- Rat urine samples were analyzed after administration of TCP and TAMORF.
- Metabolite identification and quantification were performed.
Main Results:
- Six hours post-treatment, rat urine contained only the metabolite of TCP (1-thienylcyclohexene).
- Urine samples from TAMORF-treated rats contained both TAMORF and its metabolites.
- This indicates differential elimination pathways and durations for TCP and TAMORF.
Conclusions:
- The developed GC-MS method effectively tracks the elimination of TCP and TAMORF.
- TCP is rapidly metabolized, while TAMORF exhibits a different elimination profile.
- Understanding these elimination patterns is crucial for elucidating the neuroprotective mechanisms of these compounds against OP agents.
