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[Quantification of type I and III collagen content in normal human skin in different age groups]
Yan-Hua Rong1, Gun-An Zhang, Cheng Wang
1Department of Burns, JiShuiTan Hospital, Beijing 100035, PR China.
Insights
Collagen in human skin changes with age. Type III collagen decreases after birth, while type I collagen dominates until age 8, then declines.
Area of Science:
- Dermatology and aging research.
- Biochemistry of extracellular matrix.
- Human skin physiology.
Context:
- Collagen is crucial for skin structure and elasticity.
- Age-related changes in skin composition are significant.
- Understanding collagen dynamics is key to addressing skin aging.
Purpose:
- To quantify type I and type III collagen content and their ratio in human skin across different age groups.
- To investigate the regulatory mechanisms behind age-related collagen alterations.
Summary:
- Total collagen content decreases with age, being highest in fetuses.
- Type III collagen is highest in fetuses and declines post-birth.
- Type I collagen is dominant in early childhood, with its synthesis decreasing after age 8.
- The ratio of type I to type III collagen increases with age.
Impact:
- Provides insights into the differential aging of collagen types in human skin.
- Highlights potential mechanisms for age-related skin changes.
- Informs future research on interventions for skin aging and wound healing.
Objective:
To quantify the content of type I, III collagen and their ratio in normal human skin of different age, and to explore the regulation of changes.
Methods:
The normal human skin specimens were obtained from 6 spontaneously aborted fetus and 56 burn patients of different ages, including infants (newborn -3 years), pre-school group ( > 3, < or =7 years), adolescent group ( >7, < or = 18 years), youth and middle age group ( > 18, < or = 50 years), and elderly group ( > 50 years), were studied. The total collagen content were determined by hydroxyproline method. The contents of type I, Ill collagen and their ratio were examined by immunohistochemistry.
Results:
The total collagen content decreased along with increase in age, and it was highest in fetus [(543 +/- 13) microg/g]. The ratio between type I and Ill collagen increased along with increase in age. The content of type III collagen was highest in fetus [(278 +/- 7) microg/g], and it decreased along with increase in age. The content of type I collagen content was [(265 +/- 7) microg/g] in fetus, and it was increased slightly in infant and pre-school groups, then decreased along with advance in age.
Conclusion:
Decomposition of type III collagen in normal human skin may exceed its synthesis after birth immediately, leading to its reduction. Synthesis of type I collagen in normal human skin is dominant before 8 years old, and it shows an opposite tendency afterwards.
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