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Effects of lead on growth plate chondrocyte phenotype

D G Hicks1, R J O'Keefe, K J Reynolds

  • 1Department of Orthopaedics, University of Rochester School of Medicine, New York 14642, USA.

Toxicology and Applied Pharmacology
|September 1, 1996
PubMed

Insights

Lead exposure negatively impacts children's stature by affecting growth plate chondrocytes. This study reveals low lead doses disrupt collagen synthesis and cell proliferation, indicating a key mechanism for lead-induced skeletal development issues.

Area of Science:

  • Skeletal Biology
  • Environmental Health
  • Toxicology

Background:

  • Lead toxicity is a significant public health concern in the U.S.
  • The skeleton is the primary reservoir for ingested lead.
  • Epidemiological data link lead exposure to adverse effects on children's stature.

Purpose of the Study:

  • To investigate the effects of lead on cartilage biology in isolated chondrocytes.
  • To assess changes in growth plate chondrocyte phenotype using an avian model.
  • To determine if lead directly impacts skeletal development at the cellular level.

Main Methods:

  • Isolated avian growth plate chondrocytes were cultured.
  • Cells were treated with low, sublethal doses of lead.
  • Key markers of chondrocyte phenotype, including alkaline phosphatase, collagen expression (type II and X), and thymidine incorporation, were assessed at the protein and mRNA levels.
  • Proteoglycan synthesis was also measured.

Main Results:

  • Lead exposure significantly suppressed alkaline phosphatase and collagen types II and X expression.
  • Thymidine incorporation, a marker of cell proliferation, decreased in lead-treated cells.
  • Proteoglycan synthesis was paradoxically stimulated, suggesting effects beyond general cytotoxicity.
  • These findings indicate lead directly regulates growth plate chondrocytes.

Conclusions:

  • Lead exposure exerts regulatory effects on growth plate chondrocytes in vitro.
  • Lead exposure inhibits endochondral bone formation, a critical process for skeletal development.
  • The growth plate is identified as a potential key target tissue responsible for lead's adverse effects on skeletal development in children.

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