Photoaging Decoded: Extracellular Matrix Alterations and Mechanisms via Mitogen-Activated Protein Kinase/Matrix Metalloproteinase, Transforming Growth Factor-β Pathways, and Glycosaminoglycan Metabolism.

Enyi Liu, Zhixin Xue, Ye Li, Yunjun Liao

Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, PR China.Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, PR China. · pubmed

Paper

Abstract

Photoaged skin features an appearance of premature aging induced by external factors, mainly ultraviolet (UV) irradiation. Visible aging signs and increased susceptibility to skin-related diseases triggered by UV irradiation have raised widespread concern. As a critical component of human skin, the extracellular matrix (ECM) provides essential structural, mechanical, and functional support to the tissue. Consequently, UV-induced ECM deterioration is a major contributor to photoaging. This review begins by analyzing the structural and functional changes between healthy and photoaged skin in prominent ECM components, including collagens, glycosaminoglycans (GAGs), proteoglycans, basement membrane proteins, and elastic fibers. Furthermore, we explore the key mechanisms driving ECM deterioration in response to UV irradiation, focusing on mitogen-activated protein kinase/matrix metalloproteinase and transforming growth factor-β/Smad signaling pathways, as well as the synthesis and degradation of GAGs. A comprehensive understanding of these changes and underlying mechanisms is crucial for elucidating the biological influence of UV on the ECM, ultimately providing more reliable evidence for the prevention and treatment of skin photoaging.

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Research summary

The paper discusses the mechanisms of photoaging and the alterations in the extracellular matrix due to UV irradiation, which are relevant to understanding the biological processes of aging. However, it primarily focuses on the symptoms of photoaging rather than addressing the root causes of aging or proposing solutions for lifespan extension. Thus, while it contributes to the field of aging research, its impact is limited and more incremental than transformative.

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