Dietary resveratrol administration increases MnSOD expression and activity in mouse brain

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• trans-Resveratrol (RES) shows promise for neurodegenerative diseases, potentially via antioxidant effects.
• In vitro studies link RES to increased antioxidant enzyme activity, like mitochondrial superoxide dismutase (MnSOD).
• The in vivo efficacy of RES in boosting endogenous antioxidant enzymes remains to be fully elucidated.

Purpose of the Study:

• To investigate if RES administration in vivo increases endogenous antioxidant enzyme activity.
• To assess the impact of different RES delivery methods on antioxidant capacity in the brain.
• To determine the effect of RES on MnSOD protein levels and activity.

Main Methods:

• RES was administered via standard diet, high-fat diet, or subcutaneous osmotic minipump.
• Brain antioxidant capacity was measured, focusing on MnSOD protein levels and activity.
• Mitochondrial abundance was assessed using Citrate Synthase activity.

Main Results:

• RES delivered via a high-fat diet significantly increased brain antioxidant capacity.
• MnSOD protein levels rose by 140% and activity by 75% with high-fat diet RES.
• Mitochondrial abundance increased by only 10%, indicating MnSOD increase wasn't solely due to mitochondrial proliferation.

Conclusions:

• Dietary administration of RES, particularly in a high-fat diet, effectively enhances brain antioxidant capacity in vivo.
• RES increases both the expression and activity of MnSOD, a key antioxidant enzyme.
• These findings support the potential neuroprotective role of dietary RES through enhanced endogenous antioxidant defenses.