Dermal stiffness governs the topography of the epidermis and the underlying basement membrane in young and old human skin.

Kruppel-like factors cell-matrix junctions cellular mechanotransduction extracellular matrix skin aging ultrastructure

Journal

Aging cell
ISSN: 1474-9726
Titre abrégé: Aging Cell
Pays: England
ID NLM: 101130839

Informations de publication

Date de publication:
12 Mar 2024
Historique:
revised: 05 01 2024
received: 12 10 2023
accepted: 08 01 2024
medline: 13 3 2024
pubmed: 13 3 2024
entrez: 13 3 2024
Statut: aheadofprint

Résumé

The epidermis is a stratified epithelium that forms the outer layer of the skin. It is composed primarily of keratinocytes and is constantly renewed by the proliferation of stem cells and their progeny that undergo terminal differentiation as they leave the basal layer and migrate to the skin surface. Basal keratinocytes rest on a basement membrane composed of an extracellular matrix that controls their fate via integrin-mediated focal adhesions and hemidesmosomes which are critical elements of the epidermal barrier and promote its regenerative capabilities. The distribution of basal cells with optimal activity provides the basement membrane with its characteristic undulating shape; this configuration disappears with age, leading to epidermal weakness. In this study, we present an in-depth imaging analysis of basal keratinocyte anchorage in samples of human skin from participants across the age spectrum. Our findings reveal that skin aging is associated with the depletion of hemidesmosomes that provide crucial support for stem cell maintenance; their depletion correlates with the loss of the characteristic basement membrane structure. Atomic force microscopy studies of skin and in vitro experiments revealed that the increase in tissue stiffness observed with aging triggers mechanical signals that alter the basement membrane structure and reduce the extent of basal keratinocyte anchorage, forcing them to differentiate. Genomic analysis revealed that epidermal aging was associated with mechanical induction of the transcription factor Krüppel-like factor 4. The altered mechanical properties of tissue being a new hallmark of aging, our work opens new avenues for the development of skin rejuvenation strategies.

Identifiants

pubmed: 38475908
doi: 10.1111/acel.14096
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

e14096

Subventions

Organisme : Région Auvergne-Rhône-Alpes

Informations de copyright

© 2024 The Authors. Aging Cell published by Anatomical Society and John Wiley & Sons Ltd.

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Auteurs

Eva Roig-Rosello (E)

Laboratoire de Biologie Tissulaire et Ingénierie Thérapeutique, CNRS UMR 5305, Université de Lyon, Lyon, France.
Native Laboratoire, Bezons, France.

Guila Dayan (G)

Laboratoire de Biologie Tissulaire et Ingénierie Thérapeutique, CNRS UMR 5305, Université de Lyon, Lyon, France.

Simone Bovio (S)

RDP, Université de Lyon, ENS de Lyon, UCBL1, INRAE, CNRS, Lyon, France.
PLATIM-LyMIC, Université de Lyon, ENS de Lyon, Inserm, CNRS, Lyon, France.

Patricia Manissier (P)

Native Laboratoire, Bezons, France.

Elisabeth Errazuriz (E)

Ciqle, Faculté de Médecine Lyon-Est, Lyon, France.

Patricia Rousselle (P)

Laboratoire de Biologie Tissulaire et Ingénierie Thérapeutique, CNRS UMR 5305, Université de Lyon, Lyon, France.

Classifications MeSH