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Related Experiment Videos

Ca2+ binding properties of type X collagen.

T Kirsch1, K von der Mark

  • 1Max-Planck-Society, Clinical Research Units for Rheumatology, University of Erlangen-Nürnberg, Germany.

FEBS Letters
|December 2, 1991
PubMed
Summary

Type X collagen synthesis precedes cartilage calcification. This collagen specifically binds calcium, suggesting a key role in bone development and the mineralization process.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Developmental Biology

Background:

  • Type X collagen is a developmentally regulated protein found in hypertrophic and calcifying zones of fetal cartilage.
  • Existing literature suggests a potential role for type X collagen in cartilage calcification.

Purpose of the Study:

  • To investigate the temporal relationship between type X collagen synthesis and calcium deposition in fetal human chondrocytes.
  • To determine if type X collagen directly binds calcium.

Main Methods:

  • Culturing fetal human chondrocytes to form mineralizing nodules.
  • Utilizing a binding assay with bovine type X collagen immobilized on beads and radiolabeled calcium-45 (45Ca2+).

Main Results:

  • Type X collagen synthesis was observed to precede calcium deposition in cultured chondrocyte nodules.
  • The binding assay demonstrated that type X collagen binds calcium in a specific and dose-dependent manner.
  • Approximately 15 binding sites per alpha 1(X) chain with a dissociation constant (Kd) of 32 microM were determined.

Conclusions:

  • Type X collagen synthesis is an early event preceding cartilage calcification.
  • Type X collagen possesses direct calcium-binding properties, supporting its role in cartilage mineralization.
  • These findings elucidate a novel mechanism for collagen's involvement in skeletal development.

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