title: Damage from periorbital ageing to the multilayered structures and resilience of the skin in Chinese population.
abstract: Ageing dynamically disrupts the multilayered supporting components of the skin that are held together by cell adhesion molecules (CAMs). Skin specimens from 33 female Chinese patients undergoing lower blepharoplasty were divided into three age groups and examined by haematoxylin and eosin (H&E) staining, immunohistochemistry (IHC) and Elastica-van Gieson (EVG) stains, western blotting, surface electron microscopy (SEM) and biomechanical tension analysis. The SEM density (skin surface topology) showed a negative linear relationship with age. The triangular pattern of the skin surface in the younger group gradually broke down into quadrangular and irregular patterns in the older group. Collagens and elastic fibres in the dermis showed anisotropy and decreased density in the older groups compared with the younger group, especially in the papillary dermis. Anisotropy means that physical properties differ according to the direction of measurement. E-cadherin and integrin αv (whose functions are to bind epidermal and dermal elements respectively) increased and decreased, respectively, in the oldest group. Skin resilience decreased significantly in this group under repetitive stress. In conclusion, a loss of skin surface textures, integrin αv expressions, epidermal-dermal connections and dermal compactness led to the multilayered structure of the skin becoming separated. This in turn decreased resilience during ageing. These findings may therefore explain why aged skins cannot tolerate repetitive facial expressions, and why this action produces further dynamic wrinkles.
authors: Graduate Institute of Medical Sciences, Department of Family Medicine, Taipei Municipal Wan Fang Hospital, College of Medicine, Taipei Medical University, Taipei, Taiwan. curator@tmu.edu.tw
authors: Chuh-Kai
authors: CK
authors: Liao
authors: Feng-Chou
authors: FC
authors: Tsai
authors: Tsorng-Harn
authors: TH
authors: Fong
authors: Chien-Ming
authors: CM
authors: Hu
authors: Po-Li
authors: PL
authors: Wei
authors: Ching-Hua
authors: CH
authors: Su
mesh_terms: D000328:Adult; D044466:Asian People; D001696:Biomechanical Phenomena / Q000502:physiology; D015815:Cell Adhesion Molecules / Q000378:metabolism; D003094:Collagen / Q000378:metabolism; D020405:Dermis / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D046169:Dermoscopy; D004547:Elastic Tissue / Q000378:metabolism / Q000473:pathology*; D004548:Elasticity / Q000502:physiology; D054459:Elasticity Imaging Techniques; D005143:Eyelids / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D005145:Face / Q000473:pathology; D005149:Facial Expression; D005260:Female; D006801:Humans; D008854:Microscopy, Electron; D008875:Middle Aged; D015595:Skin Aging / Q000473:pathology*
chemical_list: D015815:Cell Adhesion Molecules; D003094:Collagen