As we understand more about skin damage from free-radicals, it seems that using an antioxidant would help treat post-inflammatory changes or even permanent scars. Unfortunately no good scientific studies have shown that any oral or topical antioxidant prevents or heals skin damage. As a matter of fact, Vitamin E, when applied topically to healing wounds, has been shown to cause more harm than good. As antioxidant research continues, scientists may find a formulation that effectively reverses skin damage, but until then any claims of skin rejuvenation through the use of antioxidants are merely hype.
Posted 16 February 2013 - 03:43 AM
Posted 16 February 2013 - 04:29 AM
Blocking the ROS with antioxidants, or other means, prevents the healing.
Amputation-induced reactive oxygen species are required for successful Xenopus tadpole tail regeneration.
Understanding the molecular mechanisms that promote successful tissue regeneration is critical for continued advancements in regenerative medicine. Vertebrate amphibian tadpoles of the species Xenopus laevis and Xenopus tropicalis have remarkable abilities to regenerate their tails following amputation, through the coordinated activity of numerous growth factor signalling pathways, including the Wnt, Fgf, Bmp, Notch and TGF-β pathways. Little is known, however, about the events that act upstream of these signalling pathways following injury. Here, we show that Xenopus tadpole tail amputation induces a sustained production of reactive oxygen species (ROS) during tail regeneration. Lowering ROS levels, using pharmacological or genetic approaches, reduces the level of cell proliferation and impairs tail regeneration. Genetic rescue experiments restored both ROS production and the initiation of the regenerative response. Sustained increased ROS levels are required for Wnt/β-catenin signalling and the activation of one of its main downstream targets, fgf20 (ref. ), which, in turn, is essential for proper tail regeneration. These findings demonstrate that injury-induced ROS production is an important regulator of tissue regeneration.
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Posted 16 February 2013 - 08:51 AM
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