Fig 2.
From: Antioxidants as stabilizers of UV filters: an example for the UV-B filter octylmethoxycinnamate
Antioxidant response of the skin cells following oxidative stress injury. UV radiations increase the ROS levels, and oxidative stress occurs. When this process occurs, firstly, the endogenous antioxidants try to suppress the formation of ROS formation. Then, endogenous antioxidants cooperate with exogenous antioxidants and together suppress the propagation reactions. This cooperation induces the synthesis of new enzymes that will repair cell damage. Finally, if the cooperation is effective, the cell will survive after a period of re-adaptation, and the physiological antioxidants levels will be restored. Otherwise, in cases where stress is excessive or prolonged, the cell will not be able to recover and will undergo a programmed cell death