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Fibroblast-mediated contraction in actinically exposed and actinically protected aging skin
M W Marks1, M J Morykwas, M J Wheatley
1Department of Plastic and Reconstructive Surgery, Bowman Gray School of Medicine, Winston, Salem, N.C.
Plastic and Reconstructive Surgery
|August 1, 1990
Summary
Skin aging accelerates with environmental exposure, particularly actinic radiation. Fibroblasts from sun-exposed facial skin show reduced collagen contraction ability with age, impacting skin structure.
Area of Science:
- Dermatology
- Cell Biology
- Aging Research
Background:
- Skin aging results from chronological aging and environmental factors like actinic radiation.
- Actinic radiation is known to exacerbate visible skin aging.
- Fibroblast function, including collagen contraction, is crucial for skin integrity.
Purpose of the Study:
- To investigate the impact of aging and actinic radiation on fibroblast collagen contraction.
- To compare fibroblast function between sun-exposed (preauricular) and less-exposed (postauricular) skin areas.
- To determine the relationship between age, sun exposure, and fibroblast contractile capacity.
Main Methods:
- Skin samples were obtained from preauricular and postauricular sites of patients aged 49-74.
- Fibroblasts were cultured from these skin samples.
- Collagen-fibroblast lattices were constructed and their contraction was measured over 7 days.
Main Results:
- Preauricular fibroblasts demonstrated greater collagen lattice contraction than postauricular fibroblasts.
- The difference in contraction between the two sites was most pronounced in younger patients.
- This difference decreased linearly with increasing donor age (r = -0.96).
Conclusions:
- Fibroblasts from sun-exposed facial skin lose their collagen contraction ability with age.
- This loss of function may contribute to the visible aging effects of chronic actinic radiation.
- Age and cumulative sun exposure significantly impair fibroblast-mediated skin remodeling.