Linked Life Data

9918777

Source:http://linkedlifedata.com/resource/pubmed/id/9918777

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1999-2-9
pubmed:abstractText
In the current study, we characterized a urinary melatonin metabolite which could provide a safe and effective method to monitor generation of HO* in humans. Using mass spectrometry (MS), proton nuclear magnetic resonance (1H NMR), COSY 1H NMR analysis, and calculations on the relative thermodynamic stability, a novel melatonin metabolite was identified as cyclic 3-hydroxymelatonin (3-OHM). 3-OHM is the product of the reaction of melatonin with HO* which was generated in two different cell-free in vitro systems. Interestingly, this same metabolite, 3-OHM, was also identified in the urine of both rats and humans. A proposed reaction pathway suggests that 3-OHM is the footprint product that results when a melatonin molecule scavenges two HO*. When rats were challenged with ionizing radiation which results in HO* generation, urinary 3-OHM increased dramatically compared to that of controls. These results strongly indicate that the quantity of 3-OHM produced is associated with in vivo HO* generation. Since melatonin exists in virtually all animal species and has a wide intracellular distribution and 3-OHM is readily detected noninvasively in urine, we suggest that 3-OHM is a valuable biomarker that can be used to monitor in vivo HO* levels in humans and other species. The measurement of urinary 3-OHM as a biomarker of HO* generation could provide clinical benefits in the diagnosis and treatment of diseases.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
30
pubmed:volume
253
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
614-20
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
A novel melatonin metabolite, cyclic 3-hydroxymelatonin: a biomarker of in vivo hydroxyl radical generation.
pubmed:affiliation
Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78284-7762, USA.
pubmed:publicationType
Journal Article