4.7 Article

Cross-generational trans fat intake exacerbates UV radiation-induced damage in rat skin

Journal

FOOD AND CHEMICAL TOXICOLOGY
Volume 69, Issue -, Pages 38-45

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fct.2014.03.031

Keywords

Trans fat; Oxidative stress; Skin; Fatty acids; Trans fatty acids; Ultraviolet radiation

Funding

  1. CNPq
  2. CAPES
  3. FAPERGS
  4. PRPGP (PROAP)

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We evaluated the influence of dietary fats on ultraviolet radiation (UVR)-induced oxidative damage in skin of rats. Animals from two consecutive generations born of dams supplemented with fats during pregnancy and breastfeeding were maintained in the same supplementation: soybean-oil (SO, rich in n-6 FA, control group), fish-oil (FO, rich in n-3 FA) or hydrogenated-vegetable-fat (HVF, rich in TFA). At 90 days of age, half the animals from the 2nd generation were exposed to UVR (0.25 j/cm(2)) 3 x/week for 12 weeks. The FO group presented higher incorporation of n-3 FA in dorsal skin, while the HVF group incorporated TFA. Biochemical changes per se were observed in skin of the HVF group: greater generation of reactive oxygen species (ROS), lower mitochondrial integrity and increased Na+K+-ATPase activity. UVR exposure increased skin wrinkles scores and ROS generation and decreased mitochondrial integrity and reduced-glutathione levels in the HVF group. In FO, UVR exposure was associated with smaller skin thickness and reduced levels of protein-carbonyl, together with increased catalase activity and preserved Na+K+-ATPase function. In conclusion, while FO may be protective, trans fat may be harmful to skin health by making it more vulnerable to UVR injury and thus more prone to develop photoaging and skin cancer. (C) 2014 Elsevier Ltd. All rights reserved.

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