Effects of the nonsugar fraction of brown sugar on chronic ultraviolet B irradiation-induced photoaging in melanin-possessing hairless mice.
Brown sugar has been used traditionally for the treatment of skin trouble as a component of soaps or lotions. Symptoms of aging including wrinkles and pigmentation develop earlier in sun-exposed skin than unexposed skin, a phenomenon referred to as photoaging. Ultraviolet B (UVB) radiation is one of the most important environmental factors influencing photoaging. The aim of this study was to clarify whether the nonsugar fraction of brown sugar prevents chronic UVB-induced aging of the skin using melanin-possessing hairless mice. The nonsugar fraction (1% or 3% solution, 50 mul/mouse) was applied topically to the dorsal region every day for 19 weeks. Both solutions prevented an increase in skin thickness and reduction in skin elasticity caused by the UVB. The 3% solution also prevented wrinkles and melanin pigmentation as well as increases in the diameter and length of skin blood vessels. Increases in the expression of matrix metalloproteinase-2 (MMP-2) and vascular endothelial growth factor (VEGF) in UVB-irradiated skin was inhibited by the nonsugar fraction. Prevention of UVB-induced aging of the skin by topical application of the nonsugar fraction of brown sugar may be due to inhibition of increases in MMP-2 and VEGF expression.
Sumiyoshi
Maho
M
Division of Functional Histology, Department of Functional Biomedicine, Ehime University Graduate School of Medicine, Shitsukawa, Toon City, Ehime, Japan.
Hayashi
Teruaki
T
Kimura
Yoshiyuki
Y
D000279:Administration, Cutaneous; D000818:Animals; D004305:Dose-Response Relationship, Drug; D005786:Gene Expression Regulation / Q000187:drug effects / Q000528:radiation effects; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000187:drug effects / Q000528:radiation effects; D008543:Melanins / Q000378:metabolism*; D051379:Mice; D008812:Mice, Hairless; D031786:Saccharum / Q000737:chemistry*; D012867:Skin / Q000098:blood supply / Q000187:drug effects / Q000528:radiation effects; D015595:Skin Aging / Q000187:drug effects* / Q000528:radiation effects; D012880:Skin Pigmentation / Q000187:drug effects / Q000528:radiation effects; D014466:Ultraviolet Rays / Q000009:adverse effects*; D042461:Vascular Endothelial Growth Factor A / Q000187:drug effects / Q000528:radiation effects
D008543:Melanins; D042461:Vascular Endothelial Growth Factor A; D020778:Matrix Metalloproteinase 2