Potent neuroprotective properties against the Alzheimer β-amyloid by an endogenous melatonin-related indole structure, indole-3-propionic acid

Yau Jan Chyan, Burkhard Poeggeler, Rawhi A. Omar, Daniel G. Chain, Blas Frangione, Jorge Ghiso, Miguel Pappolla

Research output: Contribution to journalArticle

208 Citations (Scopus)

Abstract

Widespread cerebral deposition of a 40- 43-amino acid peptide called the amyloid β-protein (Aβ) in the form of amyloid fibrils is one of the most prominent neuropathologic features of Alzheimer's disease. Numerous studies suggest that Aβ is toxic to neurons by free radical-mediated mechanisms. We have previously reported that melatonin prevents oxidative stress and death of neurons exposed to Aβ. In the process of screening indole compounds for neuroprotection against Aβ, potent neuroprotective properties were uncovered for an endogenous related species, indole-3-propionic acid (IPA). This compound has previously been identified in the plasma and cerebrospinal fluid of humans, but its functions are not known. IPA completely protected primary neurons and neuroblastoma cells against oxidative damage and death caused by exposure to Aβ, by inhibition of superoxide dismutase, or by treatment with hydrogen peroxide. In kinetic competition experiments using free radical- trapping agents, the capacity of IPA to scavenge hydroxyl radicals exceeded that of melatonin, an indoleamine considered to be the most potent naturally occurring scavenger of free radicals. In contrast with other antioxidants, IPA was not converted to reactive intermediates with pro-oxidant activity. These findings may have therapeutic applications in a broad range of clinical situations.

Original languageEnglish (US)
Pages (from-to)21937-21942
Number of pages6
JournalJournal of Biological Chemistry
Volume274
Issue number31
DOIs
StatePublished - Jul 30 1999
Externally publishedYes

Fingerprint

Melatonin
Amyloid
Neurons
Free Radicals
Cerebrospinal fluid
Serum Amyloid A Protein
Free Radical Scavengers
Oxidative stress
Poisons
Neuroblastoma
Hydroxyl Radical
Hydrogen Peroxide
Superoxide Dismutase
Cerebrospinal Fluid
Reactive Oxygen Species
Alzheimer Disease
Screening
Oxidative Stress
Antioxidants
indole

ASJC Scopus subject areas

  • Biochemistry

Cite this

Potent neuroprotective properties against the Alzheimer β-amyloid by an endogenous melatonin-related indole structure, indole-3-propionic acid. / Chyan, Yau Jan; Poeggeler, Burkhard; Omar, Rawhi A.; Chain, Daniel G.; Frangione, Blas; Ghiso, Jorge; Pappolla, Miguel.

In: Journal of Biological Chemistry, Vol. 274, No. 31, 30.07.1999, p. 21937-21942.

Research output: Contribution to journalArticle

Chyan, Yau Jan ; Poeggeler, Burkhard ; Omar, Rawhi A. ; Chain, Daniel G. ; Frangione, Blas ; Ghiso, Jorge ; Pappolla, Miguel. / Potent neuroprotective properties against the Alzheimer β-amyloid by an endogenous melatonin-related indole structure, indole-3-propionic acid. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 31. pp. 21937-21942.
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