Kynuramines, metabolites of melatonin and other indoles

The resurrection of an almost forgotten class of biogenic amines

Rüdigger Hardeland, Dun Xian Tan, Russel J Reiter

Research output: Contribution to journalArticle

346 Citations (Scopus)

Abstract

Kynuramines represent their own class of biogenic amines. They are formed either by decarboxylation of kynurenines or pyrrole ring cleavage of indoleamines. N2-formylated compounds formed in this last reaction can be deformylated either enzymatically by arylamine formamidases or hemoperoxidases, or photochemically. The earlier literature mainly focussed on cardiovascular effects of kynuramine, 5-hydroxykynuramine and their N 1,N1-dimethylated analogs, including indirect effects via release of catecholamines or acetylcholine and interference with serotonin receptors. After the discovery of N1-acetyl-N2-formyl-5- methoxykynuramine (AFMK) and N1-acetyl-5-methoxykynuramine (AMK) as major brain metabolites of melatonin, these compounds became of particular interest. They were shown to be produced enzymatically, pseudoenzymatically, by various free radical-mediated and via photochemical processes. In recent years, AFMK and AMK were shown to scavenge reactive oxygen and nitrogen species, thereby forming several newly discovered 3-indolinone, cinnolinone and quinazoline compounds, and to protect tissues from damage by reactive intermediates in various models. AMK is of special interest due to its properties as a potent cyclooxygenase inhibitor, NO scavenger forming a stable nitrosation product, inhibitor and/or downregulator of neuronal and inducible NO synthases, and a mitochondrial metabolism modulator. AMK easily interacts with aromates, forms adducts with tyrosyl and tryptophanyl residues, and may modify proteins.

Original languageEnglish (US)
Pages (from-to)109-126
Number of pages18
JournalJournal of Pineal Research
Volume47
Issue number2
DOIs
StatePublished - Sep 2009

Fingerprint

Kynuramine
Indoles
Biogenic Amines
formamidase
Melatonin
Photochemical Processes
Nitrosation
Quinazolines
Kynurenine
Reactive Nitrogen Species
Pyrroles
Decarboxylation
Cyclooxygenase Inhibitors
Serotonin Receptors
Nitric Oxide Synthase
Acetylcholine
Free Radicals
Catecholamines
Reactive Oxygen Species
Brain

Keywords

  • 5-hydroxykynuramine
  • AFMK
  • AMK
  • Inflammation
  • Mitochondria
  • Pyrrole ring cleavage
  • Reactive nitrogen species
  • Reactive oxygen species

ASJC Scopus subject areas

  • Endocrinology

Cite this

Kynuramines, metabolites of melatonin and other indoles : The resurrection of an almost forgotten class of biogenic amines. / Hardeland, Rüdigger; Tan, Dun Xian; Reiter, Russel J.

In: Journal of Pineal Research, Vol. 47, No. 2, 09.2009, p. 109-126.

Research output: Contribution to journalArticle

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