Endogenous morphine and codeine in the brain of non human primate.
BACKGROUND
Morphine is the most used compound among narcotic analgesics. Apart from its presence in the poppy plant, morphine has been shown to be endogenously present in different tissues of mammals and lower animals.


METHODS
The presence of endogenous morphine and codeine was investigated by Gas Chromatography/ Mass Spectrometry (GC/MS) in the brain of non human primate. The release of endogenous morphine from monkey brain slices was studied in vitro in the presence of high potassium concentrations with and without calcium in the medium.


RESULTS
Endogenous morphine, and its direct precursor codeine, was for the first time detected by GC/MS in the brain of non human primate. High potassium concentrations depolarized neurons releasing endogenous morphine twofold above basal line levels in a calcium dependent mechanism.


CONCLUSIONS
This finding confirms the presence of the endogenous alkaloid throughout the phylogenesis of the nerve system of mammals and lower animals and indicates that endogenous morphine might function as a neuromodulator/neurotransmitter agent in the central nervous system (CNS) of non human primates.
Neri
Carla
C
Department of Medicine and Public Health, Institute of Forensic Medicine, University of Verona, Italy.
Guarna
Massimo
M
Bianchi
Enrica
E
Sonetti
Dario
D
Matteucci
Giacomo
G
Stefano
George B
GB
D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D001923:Brain Chemistry / Q000187:drug effects; D002521:Cercopithecus / Q000378:metabolism*; D003061:Codeine / Q000032:analysis* / Q000378:metabolism / Q000494:pharmacology; D008401:Gas Chromatography-Mass Spectrometry; D008297:Male; D009020:Morphine / Q000032:analysis* / Q000378:metabolism / Q000494:pharmacology
D009020:Morphine; D003061:Codeine