Abstract
The dermal extracellular matrix (ECM) comprises the bulk of skin and confers strength and resiliency. In young skin, fibroblasts produce and adhere to the dermal ECM, which is composed primarily of type I collagen fibrils. Adherence allows fibroblasts to spread and exert mechanical force on the surrounding ECM. In this state, fibroblasts display a “youthful” phenotype characterized by maintenance of the composition and structural organization of the dermal ECM. During aging, fibroblast-ECM interactions become disrupted due to fragmentation of collagen fibrils. This disruption causes loss of fibroblast spreading and mechanical force, which inextricably lead to an “aged” phenotype; fibroblasts synthesize less ECM proteins and more matrix-degrading metalloproteinases. This imbalance of ECM homeostasis further drives collagen fibril fragmentation in a self-perpetuating cycle. This article summarizes age-related changes in the dermal ECM and the mechanisms by which these changes alter the interplay between fibroblasts and their extracellular matrix microenvironment that drive the aging process in human skin.
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Abbreviations
- UV:
-
ultraviolet
- ECM:
-
extracellular matrix
- GAG:
-
glycoseaminoglycan
- PG:
-
prostaglandin
- Lys:
-
lysine
- Hyl:
-
hydroxylysine
- LOX:
-
lysyl oxidase
- MMP:
-
matrix metalloprotease
- ROS:
-
reactive oxygen species
- PTP:
-
protein tyrosine phosphatase
- RTK:
-
receptor tyrosine kinase
- MAPK:
-
mitogen activated protein kinase
- ERK:
-
extracellular signal-regulated kinase
- JNK:
-
c-Jun N-terminal kinase
- AP-1:
-
activated protein 1
- CCN1:
-
cysteine-rich protein 61
- TNF- α:
-
tumor necrosis factor alpha
- TGF- β:
-
transforming growth factor beta
- GzmB:
-
granzyme B
- AADM:
-
age-associated dermal microenvironment
- IGFBP:
-
insulin-like growth factor binding protein
- VWC:
-
von Willebrand factor type C
- TSP1:
-
thrombospondin type 1
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Acknowledgements
This work was supported by funding from the National Institute of Health (grant R01-AG051849 and RO1-AG054835 to GJF and TQ and T32-AM07197 to MAC – PI: JT Elder).
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Cole, M.A., Quan, T., Voorhees, J.J. et al. Extracellular matrix regulation of fibroblast function: redefining our perspective on skin aging. J. Cell Commun. Signal. 12, 35–43 (2018). https://doi.org/10.1007/s12079-018-0459-1
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DOI: https://doi.org/10.1007/s12079-018-0459-1