Mechanistic investigations on the antioxidant action of a neuroprotective estrogen derivative
摘要:
Antioxidant action is an important component of the complex neuroprotective effect of estrogens. Combining theoretical prediction and subsequent experimental confirmation by chemical and in vitro paradigms, this study focused on the mechanistic aspects of hydroxyl radical scavenging by 17 beta-butoxy-1,3,5(10)-estratrien-3-ol, a synthetic derivative of 17 beta-estradiol with increased potency to inhibit lipid peroxidation and reduced affinity to estrogen-receptors compared to the endogenous hormone. In the process that acts as a "chemical shield," the phenolic A-ring turns into 10 beta-hydroxy-17 beta-butoxy-1,3,5(10)-estratrien-3-one, a non-aromatic paro-quinol, upon capturing hydroxyl radicals, which results in the complete loss of estrogen-receptor affinity and antioxidant activity. However, the parent compound is apparently recovered in brain tissue from this para-quinol via enzyme-catalyzed NAD(P)H-dependent reductive aromatization without causing oxidative stress. Taken together, our report argues for a previously unrecognized antioxidant cycle for estrogen-derived compounds. (C) 2007 Elsevier Inc. All rights reserved.
Steroidal quinols and their use for antioxidant therapy
申请人:——
公开号:US20030229060A1
公开(公告)日:2003-12-11
The present invention relates to novel estrogen-related steroidal quinols and their use as prodrugs for phenolic estrogens and estrogen analogs. The quinols of the present invention provide improved physicochemical properties, increased bioavailability, and improved distribution into tissues and penetration across the blood-brain barrier when compared to phenolic estrogens and estrogen analogs.