title: Improvement of skin condition by oral administration of collagen hydrolysates in chronologically aged mice.
abstract: BACKGROUND
  Collagen hydrolysates (CHs) have been demonstrated to have positive effects on skin photoaging by topical application or oral ingestion. However, there has been little research on their influence on skin chronological aging. In this study, 9-month-old female ICR mice were given normal AIN-93M diets containing CHs (2.5, 5 and 10% w/w) from Nile tilapia scale.
  
  
  RESULTS
  After 6 months, the collagen content and antioxidant enzyme (superoxide dismutase and glutathione peroxidase) activities increased significantly (P < 0.05), while the survival rate, viscera indices and contents of moisture, fat and non-collagenous protein in skin did not change (P > 0.05). The color, luster and quantity of hair were obviously ameliorated. Moreover, the structure of epidermis and dermis, the density and distribution of collagen fibers and the ratio of type I to type III collagen were improved in a dose-dependent manner as shown by histochemical staining.
  
  
  CONCLUSIONS
  Oral ingestion of CHs increased the collagen content and antioxidant enzyme activities and improved the appearance and structure of skin. These results suggest the potential of CHs as an anti-skin-aging ingredient in nutraceuticals or functional foods. © 2016 Society of Chemical Industry.
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Zhenbin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Pharmacy, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Xu
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: He
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Yunliang
authors.initials: Y
authors.lastname: Li
authors.affiliation: Lianyungang Haideyi Food Company Limited, Lianyungang, 222113, China.
authors.forename: Song
authors.initials: S
authors.lastname: He
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Haile
authors.initials: H
authors.lastname: Ma
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D003094:Collagen / Q000737:chemistry / Q000378:metabolism*; D005260:Female; D029941:Fish Proteins / Q000737:chemistry / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D051379:Mice; D008813:Mice, Inbred ICR; D011492:Protein Hydrolysates / Q000737:chemistry / Q000378:metabolism*; D012867:Skin / Q000201:enzymology / Q000378:metabolism* / Q000528:radiation effects; D015595:Skin Aging / Q000528:radiation effects*; D013482:Superoxide Dismutase / Q000378:metabolism; D017210:Tilapia; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D029941:Fish Proteins; D011492:Protein Hydrolysates; D003094:Collagen; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase
keywords: chronological aging; collagen hydrolysates; histological structure; oxidative stress; skin condition; visual appearance