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Modulation of antioxidant enzyme expression and function by estrogen.

Kerstin Strehlow¹, Simone Rotter, Sven Wassmann

¹Medizinische Klinik und Poliklinik, Innere Medizin III, Universitätskliniken des Saarlandes, Homburg/Saar, Germany.

Circulation Research

|June 21, 2003

Summary

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Estrogen, specifically 17beta-estradiol, reduces harmful free radicals in blood vessels by boosting antioxidant enzymes like manganese superoxide dismutase (MnSOD) and extracellular superoxide dismutase (ecSOD). This supports its protective role in cardiovascular health.

Area of Science:

Cardiovascular Biology
Endocrinology
Oxidative Stress Research

Background:

Oxidative stress is a key factor in atherosclerosis development.
Estrogens possess potential vasoprotective properties linked to antioxidant capabilities.

Purpose of the Study:

To investigate the impact of 17beta-estradiol on reactive oxygen species production.
To determine the effects of 17beta-estradiol on radical scavenging enzyme expression and activity.

Main Methods:

Assessed free radical production using DCF fluorescence laser microscopy.
Quantified superoxide dismutase (SOD) enzyme expression and activity via Northern/Western blotting and photometric assays.
Analyzed gene transcription rates and mRNA stability using nuclear run-on assays and mRNA half-life studies.

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Main Results:

17beta-estradiol decreased angiotensin II-induced free radical production in vascular smooth muscle cells.
Upregulated manganese superoxide dismutase (MnSOD) and extracellular superoxide dismutase (ecSOD) expression and activity in a time- and concentration-dependent manner.
Increased MnSOD and ecSOD transcription rates, with estrogen stabilizing ecSOD mRNA.

Conclusions:

Estrogen enhances antioxidant defense by stimulating MnSOD and ecSOD expression and activity.
Estrogen deficiency leads to increased vascular oxidative stress, which is reversed by estrogen.
These antioxidative effects of estrogen contribute to its vasoprotective actions, particularly in atherosclerosis.