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A role for estrogen receptor-α and estrogen receptor-β in collagen biosynthesis in mouse skin

Margaret Markiewicz1, Sergey Znoyko, Lukasz Stawski

  • 1Medical University of South Carolina, Charleston, SC, USA. markiewi@musc.edu

The Journal of Investigative Dermatology
|August 17, 2012
PubMed

Insights

Estrogen receptors (ERs) play distinct roles in skin collagen. Estrogen receptor alpha (ERα) deficiency increases collagen, while ERβ deficiency decreases it, impacting tissue structure and homeostasis.

Area of Science:

  • Dermatology
  • Endocrinology
  • Molecular Biology
  • Extracellular Matrix Research

Background:

  • Hormonal regulation of the dermal extracellular matrix is crucial for skin homeostasis.
  • The specific roles of estrogen receptors (ERs) in regulating collagen biosynthesis remain incompletely understood.

Purpose of the Study:

  • To investigate the distinct roles of estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ) in regulating collagen biosynthesis and dermal structure in mice.

Main Methods:

  • Analysis of collagen content in the skin of ERα knockout (ERα(-/-)) and ERβ knockout (ERβ(-/-)) mice using acetic acid extraction and hydroxyproline assay.
  • Quantification of matrix metalloproteinases (MMPs) and small leucine proteoglycans (lumican and decorin).
  • Assessment of collagen fibril structure and fibroblast collagen production.

Main Results:

  • ERα(-/-) mice showed increased skin collagen content, decreased MMP-15, and elevated fibroblast collagen production.
  • ERβ(-/-) mice exhibited decreased skin collagen content despite increased fibroblast collagen production, with elevated MMPs (MMP-8, MMP-15) suggesting increased degradation.
  • ERβ(-/-) mice had reduced lumican and decorin, leading to collagen fibrillogenesis defects, while ERα(-/-) mice showed irregular collagen fibrils associated with increased lumican and decorin.

Conclusions:

  • Estrogen receptor alpha and beta have distinct and opposing roles in regulating collagen biosynthesis and dermal extracellular matrix integrity in mouse skin.
  • ERα appears to promote collagen accumulation, whereas ERβ influences collagen degradation and fibril organization through proteoglycan regulation.

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