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Arimoto H.,Japan National Institute of Advanced Industrial Science and Technology | Yanai M.,Shiseido Research Center Yokohama Japan | Egawa M.,Shiseido Research Center Yokohama Japan
Skin Research and Technology | Year: 2016

Background/purpose: Near-infrared (NIR) light with high water absorption enables us to visualize the water content distribution appeared in the superficial skin layer. The light penetration depth with the wavelength of 1920 nm is almost 100 μm from the skin surface. Thus, the water distribution in the stratum corneum can be effectively imaged by detecting the wavelength band around 1920 nm. The aim of this article was to measure the time-lapse behavior of the tiny droplet of the moisturizer spreading on the skin surface by imaging in 1920 nm wavelength band for investigating the correlation with the traditional index of the skin condition such as the water content and transepidermal water loss (TEWL). Methods: Experiment is performed with three moisturizer products and seven volunteer subjects. The NIR image is acquired by an originally designed imaging scope equipped with the white light of the strong brightness [super continuum (SC) light], the bandpass filter with the center wavelength of 1920 nm, and the NIR image sensor. A tiny droplet of the moisturizer is put on the surface of the skin and the time-lapse images are saved. Each acquired image is analyzed from a view point of the droplet area and elapsed time for absorption into the skin. The water content and TEWL of all subjects are measured by the conventional electrical method for investigating the relationship with the measured droplet dynamics parameters. Results: Elapsed time for moisturizer droplet to be absorbed into the skin, the droplet area just before absorption for three moisturizer products, skin water contents, and TEWL for seven subjects were measured and correlation coefficients for each parameters were calculated. It was found that the skin with higher water contents or lower TEWL absorbed the moisturizer faster and spreads moisturizer wider. Also absorption and spreading speed depend on moisturizer property (moisturizing or fresh) which is originated from the moisturizer constituents. Conclusion: The correlation values between the moisturizer dynamics on the skin surface and the traditional index of the skin property were clarified. It was found that the skin with the high water content or low TEWL absorbs the moisturizer droplet fast. The spreading area depends not only on the skin property but on the constituents of the moisturizers. © 2016 John Wiley & Sons A/S. Source


Kadoya K.,Shiseido Research Center Yokohama Japan | Amano S.,Shiseido Research Center Yokohama Japan | Nishiyama T.,Tokyo University of Agriculture and Technology | Inomata S.,Shiseido Research Center Yokohama Japan | And 3 more authors.
International Wound Journal | Year: 2015

This study investigated the recovery process during which grafted cultured epithelium generated skin elasticity and skin surface microarchitecture. The subjects were 18 patients whose burn scars were excised at a depth not exposing the fat layer and who subsequently received cultured epithelial autografts. A total of 24 samples were obtained from the grafted sites: 6 samples within 6weeks (stage 1), 5 samples after 6weeks and within 6months (stage 2), 6 samples after 6months and within 18months (stage 3) and 7 samples beyond 18months (stage 4) of transplantation. These samples were evaluated by taking replicas of skin surface, and histological changes of fibrillin-1 and elastin. The expression patterns were classified using a grading scale. The grade of skin surface texture was significantly higher at stage 3 and marginally significantly higher at stage 4 compared with stage 1. The grade of fibrillin-1 was marginally significantly higher at stage 3 and significantly higher at stage 4 compared with stage 1. The grade of elastin was marginally significantly higher at stage 4 compared with stage 1. These results showed that it is important for patients to have skin care and avoid external forces for at least 18months after transplantation. © 2015 Medicalhelplines.com Inc and John Wiley & Sons Ltd. Source


Hanzawa N.,Shiseido Research Center Yokohama Japan | Ishino A.,Shiseido Research Center Yokohama Japan | Nakazawa Y.,Shiseido Research Center Yokohama Japan | Ogo M.,Shiseido Research Center Yokohama Japan | And 2 more authors.
International Journal of Cosmetic Science | Year: 2015

Synopsis: Objective: Hair thickness is more important than hair density in the appearance of baldness in male with androgenetic alopecia (AGA). Adenosine improves hair loss by stimulating hair growth and by thickening hair shafts in women. The objective of this study was to evaluate the hair growth efficacy and safety of topical adenosine in men with AGA. Methods: A lotion containing either adenosine or niacinamide was administered to the scalps of 102 Japanese men twice daily for 6 months in a double-blind, randomized study. Efficacy was evaluated by dermatologists who assessed the quality of the hair and by calculating the percentages of vellus-like and thick hairs among the vertex hairs, as well as hair density. Results: Adenosine was significantly (P < 0.05) superior to niacinamide in terms of global improvement of AGA, increase in the percentage of thick hairs (at least 60 μm) and self-assessment of hair thickness by the study participants. No causal adverse event due to the adenosine lotion was observed. Conclusion: These data indicate that adenosine increases thick hair ratio in Japanese men with AGA, and this compound is useful for the improvement of AGA. © 2015 Society of Cosmetic Scientists and the Société Française de Cosmétologie. Source

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