Les UV de tous les jours représentent la principale cause des rides profondes
Si vous doutiez de l’effet du soleil sur votre visage…
Cet homme a conduit un camion pendant 28 ans : le côté gauche de son visage a été surexposé aux rayons UV du soleil. Le côté gauche de son visage est très ridé, le côté droit, beaucoup moins.
Images in Clinical Medicine Unilateral Dermatoheliosis
Jennifer R.S. Gordon, M.D., and Joaquin C. Brieva, M.D.
N Engl J Med 2012; 366:e25 April 19, 2012
A 69-year-old man presented with a 25-year history of gradual, asymptomatic thickening and wrinkling of the skin on the left side of his face. The physical examination showed hyperkeratosis with accentuated ridging, multiple open comedones, and areas of nodular elastosis. Histopathological analysis showed an accumulation of elastolytic material in the dermis and the formation of milia within the vellus hair follicles. Findings were consistent with the Favre–Racouchot syndrome of photodamaged skin, known as dermatoheliosis. The patient reported that he had driven a delivery truck for 28 years. Ultraviolet A (UVA) rays transmit through window glass, penetrating the epidermis and upper layers of dermis. Chronic UVA exposure can result in thickening of the epidermis and stratum corneum, as well as destruction of elastic fibers. This photoaging effect of UVA is contrasted with photocarcinogenesis. Although exposure to ultraviolet B (UVB) rays is linked to a higher rate of photocarcinogenesis, UVA has also been shown to induce substantial DNA mutations and direct toxicity, leading to the formation of skin cancer. The use of sun protection and topical retinoids and periodic monitoring for skin cancer were recommended for the patient.
Documents FMC 2014 :
Fmc pharmaciens 2014 :FMC Vieillissement cutané – Antirides HVL 2014
Autre exemple des effets des UV
Modification 15 juin 2014 Dr Hervé VAN LANDUYT Asfoder 2014