The abbreviated chemical reactions below illustrate the accumulation of free radical damage and oxidative stress.
For our first free radical, we’ll use the oxygen radical, written with an asterisk (*) indicating it contains very high energy.
The O* is of such high energy that it immediately combines with whatever structure it first touches.
- In combining with this structure, it damages it and, in the process, another free radical is created.
- This second free radical, being also of very high energy, combines with the first structure it touches.
The process continues as shown below.
- O* + cell membrane / damaged cell membrane + A*
cell membrane protects integrity of cell.
- A* + mitochondria / damaged mitochondria + B*
mitochondria produces energy for the cell.
- B* + DNA damaged DNA + D*
DNA is the genetic mechanism of the cell which directs all cellular function and reproduces itself to create another cell — damaged DNA leads to a cancerous or malignant cell.
- D* + cellular protein/collagen/elastin / damaged elastic tissue (wrinkles) + E*
This process continues forever as cellular structures are damaged by free radicals and more free radicals are created.
However, an antioxidant combines with O* at the beginning of this process, neutralizing this entire cascade and preventing all of the ensuing damage.
For this reason, antioxidants are crucial to maintaining cellular function as we age (and, from the time of birth, we are all aging).
Below is a very simple drawing of a cell to illustrate the location of the cellular components mentioned above in the reaction describing damage from oxidative stress.
Any of the body’s cells could be used to illustrate these general principles, but a skin cell is illustrated here.
Remember that a skin cell, being near the surface of the body, is bombarded with additional stressors from the environment that fail to reach other cells far within the organism’s interior.
