en
Scientific article
English

NO-donor melatonin derivatives: synthesis and in vitro pharmacological characterization

Published inJournal of pineal research, vol. 42, no. 4, p. 371-385
Publication date2007
Abstract

Numerous studies document that melatonin possesses a broad-spectrum antioxidant activity. It traps a number of reactive oxygen species (ROS) such as hydroxyl and peroxyl radicals, singlet oxygen and hypochlorous acid. It also inhibits peroxynitrite-induced reactions. It is known that atherosclerosis progression involves ROS-induced oxidation of low-density lipoproteins in sub-endothelial space and the depletion of nitric oxide (NO) in blood vessels, as well as a decreased sensitivity of the vessels to the actions of NO. Considering this, a series of new NO-donor antioxidants were designed and synthesized by joining melatonin with NO-donor nitrooxy and furoxan moieties as polyvalent agents potentially useful for the treatment of cardiovascular diseases involving atherosclerotic vascular changes. The in vitro antioxidant properties of the resulting products were assessed in the thiobarbituric acid reactive substances assay (TBARS), the ABTS(+.) as well as in the alkaline phosphatase (ALP) assay. The antioxidant capacities of NO-donor melatonins to inhibit lipoperoxidation (TBARS-IC(50)) was predominantly dependent on their lipophilicity, and therefore on their partitioning process into membranes. On the other hand, their comparable capacity to inhibit protein oxidation (ALP-IC(50)) was independent of their lipophilicity and was consistent with their similar ability to participate in electron transfer reactions. All the NO-donor melatonins were also evaluated for their ability to relax rat aorta strips precontracted with 1 microM phenylephrine. Finally, binding affinities and intrinsic activity studies, carried out at MT(1) and MT(2) receptor subtypes, showed a rather complex picture in need of further investigation.

Keywords
  • Alkaline Phosphatase/metabolism
  • Animals
  • Antioxidants/chemical synthesis/chemistry/pharmacology
  • Humans
  • Lipid Peroxidation/drug effects
  • Male
  • Melatonin/analogs & derivatives/chemical synthesis/pharmacology
  • Microsomes, Liver/drug effects/metabolism
  • Molecular Structure
  • Nitric Oxide Donors/chemical synthesis/chemistry/pharmacology
  • Rats
  • Rats, Wistar
  • Receptor, Melatonin, MT1/metabolism
  • Receptor, Melatonin, MT2/metabolism
  • Recombinant Proteins/metabolism
  • Thiobarbituric Acid Reactive Substances/metabolism
  • Vasodilation/drug effects
Citation (ISO format)
CHEGAEV, Konstantin et al. NO-donor melatonin derivatives: synthesis and in vitro pharmacological characterization. In: Journal of pineal research, 2007, vol. 42, n° 4, p. 371–385. doi: 10.1111/j.1600-079X.2007.00429.x
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Article (Published version)
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Identifiers
ISSN of the journal0742-3098
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