Abstract
Early behavioural and neurochemical studies suggested the involvement of tryptophan (TRP) in the mechanisms of analgesia. These studies were followed by an impressive number of experiments on the possible involvement of serotonin (5-HT) in this phenomenom. However the physiological role of the serotonin system(s) in pain and analgesia remained to be clarified. During the last decade the role of the excitatory amino acids in the transmisson of nociceptive messages at spinal level was clearly established. During the same period, parallel studies suggested that the second route of trytophan metabolism e.g the kynurenine pathway, is involved in the control of neuronal activity. Considered simultaneously these different studies lead to the idea that metabolites of kynurenine e.g kynurenic acid (KYN) and quinolinic acid (QUIN), endogenous ligands of excitatory amino acids receptors, might play a role in analgesia and nociception. This paper discusses some recent data related to the possible respective roles of 5-HT and kynurenine derivatives in pain mechanisms at the spinal level.
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© 1996 Plenum Press, New York
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Weil-Fugazza, J. (1996). Endogenous Kynurenine Derivatives and Pain. In: Filippini, G.A., Costa, C.V.L., Bertazzo, A. (eds) Recent Advances in Tryptophan Research. Advances in Experimental Medicine and Biology, vol 398. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0381-7_11
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DOI: https://doi.org/10.1007/978-1-4613-0381-7_11
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