Heal Yourself At Home
DIY SOLUTIONS FOR YOUR HEALTH
Body's Enzymatic Antioxidants

(1)Enzymatic Antioxidants

(Biochemical enzyme catalysts, found in organisms' healthy cells)

Superoxide Dismutase (SOD) - this water-soluble enzyme needs Manganese, Zinc, Copper (marginal to deficient in US diet), depending on location (Zinc-Copper SOD in the cytosol, Manganese SOD in the mitochondria.

Removes the Superoxide Radical H2O2 and OH) –by catalyzing the dismutation of O2⁻ intooxygen and hydrogen peroxide

O2⁻ +O2⁻

O2 +H2O2

Mn/ZnCu-SOD

Concentration of SOD in mammals is directly proportional to their life span

Found in the cells' cytoplasm and mitochondria (energy factory)

Catalase (CAT) found in membranes of eukaryotic cells (thus not in bacteria); Requires Iron to function

Catalyze decomposition of Hydrogen Peroxide (H2O2 ) to oxygen and water

2 H2O2

O2 + 2

CAT

Highly reactive enzyme found in peroxisomes (cellular organelles containing enzymes)

Glutathione Peroxidase (GPx) - Contains and Requires Selenium to function; actually a family of 8 isoforms: Gpx1 (in cytoplasm ofmost all mammalian cells), GPx2 (intestines) - --GPx8, each found in specific areas of the body)

-Two main functions (in reactions requiring glutathione (GSH)):

Catalyze reduction of lipid hydroperoxides (ROOH) to their corresponding alcohols

2GSH + ROOH

GS-SG + ROH + H2O

GPx

Alcohol

Catalyze reduction of free Hydrogen Peroxide (H2O2) (source of hydroxyl radicals) to water - H2O2 is the preferred substrate of GPx1

2GSH + H2O2

GS-SG + 2 H2O

GPx

Without GPx or CAT to remove Hydrogen peroxide, SOD is of little value.

To deal with specific problems, such as wound healing, the body produces H2O2, which must then be removed from where it is not needed, to prevent damage.

AOX - ROS Related Links

ANTIOXIDANT / OXIDANT BALANCE Related Links

Health is a Balancing Act Between OXIDANTS and ANTIOXIDANTS

-A Powerful bioxidative tool

- LIFE'S OXYGEN PARADOX

- Meet Dr. ROS Jeckyll

and Mr. ROS Hyde

Dr. ROS Jeckyll

Mr. ROS Hyde

- Where do Body's ROS Come From?

Ÿ ROS Chart

- Antioxidants - Oxidant Damage Control

ENZYMATIC ANTIOXIDANTS

NON-ENZYMATIC ANTIOXIDANTS