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Tuesday, 29 October 2013

Dementia Preventions - Antioxidants Against Dementia

I. Dementia
About 5-8% of all people over the age of 65 have some form of dementia, and this number doubles every five years above that age. Dementia is the loss of mental ability that is severe enough to interfere with people's every life and Alzheimer's disease is the most common type of dementia in aging people. American typical diet contains high amount of saturated and trans fat, artificial ingredients with less fruits and vegetable which can lead to dementia and other kind of diseases.

II. Antioxidants
Antioxidant is defined as a molecule inhibited the oxidation of other molecules by a chemical reaction that transfers electrons or hydrogen from a substance to an oxidizing agent in preventing the occurrence of oxidation. A free radical is any atom or molecule that has a single unpaired electron in an outer shell and highly reactive to react with other cell, which in turn, causes oxidative damage to the enzymes, other protein, unsaturated fatty acid, phospho-lipids, DNA and RNA, etc., leading to aging of the organisms, as a result of widespread damage due to set of a chain reaction auto-catalytically after attacking the lipid bilayers of the cell walls.

III. Antioxidants and Dementia
A. Antioxidant enzymes
Antioxidant enzymes are chemical substances found in plants that can protect the body from damage of free radicals by terminating the chain reactions by removing free radical intermediates and inhibiting other oxidation reactions.
1. Catalase
Catalase is an enzyme, found in most living organisms that are exposed to oxygen helped to converse hydrogen peroxide (free radicals) to water and oxygen as a rate of 40 million molecules of hydrogen peroxide to water and oxygen each second, using either an iron or manganese cofactor.

2. Glutathione peroxidase
The function of glutathione peroxidase is to protect the organism from oxidative damage by reducing lipid hydroperoxides, an oxidation of lipid cell membranes which can easily break and form free radicals of the form RO and converting free hydrogen peroxide to oxygen and water.

3. Glutathione reductase
Glutathione reductase, an enzyme reduces pair of sulfur atoms glutathione to the a organosulfur compound form of antioxidant (consisting of three amino acids joined by peptide bonds) which helps to prevent damage of important cellular components caused by free radicals and peroxides.

4. Super oxide dismutase (both Cu-Zn and Mn)
Super oxide dismutase is an important antioxidant defense in nearly all cells exposed to oxygen by converting superoxide into oxygen and hydrogen peroxide depending on the metal cofactor such as both Cu-Zn and Mn.

B. Metals binding proteins 
1. Ceruloplasmin
Ceruloplasmin, the major copper-carrying protein in the blood plays a role in iron metabolism. It prevents the oxidation that leads to the forming of oxidation from Fe2+ (ferrous iron) into Fe3+ (ferric iron) by exhibiting a copper-dependent oxidase activity, causing mutations in the ceruloplasmin gene cause of iron overload in the brain, liver, pancreas, and retina.

2. Ferritin
Ferritin, the protein produced by almost all living organisms, acts as a component to fight against iron deficiency and iron overload, keep in a soluble and non-toxic form and transport it to the body needs, including organs. It enhances the immune system in the presence of an infection or cancer and prevent the infectious agent attempts to bind iron to become free radicals by migrating from the plasma to within cells.

3. Lactoferrin
Lactoferrin, a multifunctional protein of the transferrin family, is one of the components of the immune system of the body by fighting against foreign invasion of bacteria and virus and lipid oxidation by inhibiting oxidation in a concentration-dependent manner even at concentrations beyond its capacity.

4. Metallotheinein
Metallotheinein, a family of cysteine-rich, low molecular weight proteins helps to bind both physiological heavy metals through the organosulfur compound of its cysteine residues. It also captures harmful superoxide and hydroxyl radicals by liberating the metal ions which were bound to cysteine.

5. Transferrin
Transferrin is a glycoprotein that binds iron very tightly but reversibly. It enhance the immune system in fighting against infection, inflammation by creating an environment low in free iron that impedes bacteria survival and cell oxidation.

6. Hemoglobin
Hemoglobin is the protein molecule in red blood cells that enhances the carrying of oxygen from the lungs to the body's tissues and return CO2 from the tissues to the lungs.
During oxidate stress, the cell membrane is protected by intraerythrocytic hemoglobin from the forming of free radical.

7. Myoglobin
Myoglobin is an iron- and oxygen-binding protein found in the muscle tissue of vertebrates. The binding of oxygen by myoglobin is unaffected by the oxidation or chain of oxidative reaction in the surrounding tissue, thus reducing the free radicals damage caused by oxidate stress.

8. Etc.

C. Common Free Radical Scavengers 
Bilirubin is a prosthetic group which helps to break down molecules into smaller units in releasing energy, excreted in bile and urine. It is a cellular antioxidant, by reverting to biliverdin, a green tetrapyrrolic bile pigment, once again when oxidized that inhibits the effects of mutagens.

2. Carotenoids
Carotenoids are organic pigments, occurring in the chloroplasts and chromoplasts of plants and some other photosynthetic organisms like algae, some bacteria.
a. Beta-carotene
Beta-Carotene, an organic compound and classified as a terpenoid, a strongly-coloured red-orange pigment in plants and fruits.
a.1. It is not toxic and stored in liver for the production of vitamin A that inhibits cancer cell in experiment. Beta-carotene also neutralize singlet oxygen before giving rise of free radicals which can damage of DNA, leading to improper cell DNA replication, causing cancers.
a.2. Cell communication
Researcher found that beta-carotene enhances the communication between cell can reduce the risk of cancer by making cells division more reliable.
a.3. Immune system
Beta-carotene promotes the immune system in identifying the foreign invasion such as virus and bacteria by increasing the quality of MHC2 protein in maintaining optimal function of white cells.
a.4. Polyunsaturated fat
Researchers found that beta-carotene also inhibits the oxidation of polyunsaturated fat and lipoprotein in the blood that reduce the risk of plaques build up onto the arterial walls, causing heart diseases and stroke.
a.5. There are more benefits of beta-carotene.

3. Flavonoids
Flavonoids also known as Vitamin P and citrin are a yellow pigments having a structure similar to that of flavones occurred in varies plants. it has been in human history for over thousands of years and discovered by A. S. Szent-Gyorgi in 1930. As he used vitamin C and flavonoids to heal the breakage of capillaries, which caused swelling and obstruction of blood flow. Most plants have more than one group or type act as predominate.
Flavonoids process a property as antioxidants. it helps to neutralize many of reactive oxygen species (ROS), including singlet oxygen, hydroxyl and superoxide radicals.
Although nitric oxide is considered a free radical produced by immune system to destroy bacteria and cancerous cells, but when it is over produced, it causes the production peroxynitrite which may attack protein, lipid and DNA, Flavonoids inhibit NO production of peroxynitrite due to reduction of enzyme expression.

4. Vitamin A, C, E. D.
a. Vitamin A
Vitamin A occurs in the form retinol and is best known for its function in maintaining the health of cell membrane, hair, skin, bone, teeth and eyes. It also plays an important role as an antioxidant as it scavenges free radicals in the lining of the mouth and lungs; prevents its depletion in fighting the increased free radicals activity by radiation; boosts immune system in controlling of free radicals; prevents oxidation of LDL and enhances the productions of insulin pancreas.

b. Vitamin C
Vitamin C beside plays an important role in formation and maintenance of body tissues, it as an antioxidant and water soluble vitamin, vitamin C can be easily carry in blood, operate in much of the part of body. By restoring vitamin E, it helps to fight against forming of free radicals. By enhancing the immune system, it promotes against the microbial and viral and irregular cell growth causes of infection and inflammation.
Vitamin C also is a scavenger in inhibiting pollution cause of oxidation.

c. Vitamin E
Vitamin E is used to refer to a group of fat-soluble compounds that include both tocopherols and tocotrienols discovered by researchers Herbert Evans and Katherine Bishop. It beside is important in protecting muscle weakness, repair damage tissues, lower blood pressure and inducing blood clotting in healing wound, etc, it also is one of powerful antioxidant, by moving into the fatty medium to prevent lipid peroxidation, resulting in lessening the risk of chain reactions by curtailing them before they can starts.

5. Etc.

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