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Related Experiment Videos

Assembly of the tendon extracellular matrix during development

D E Birk1, E Zycband

  • 1Department of Anatomy and Cellular Biology, Tufts University School of Medicine, Boston, MA 02111.

Journal of Anatomy
|June 1, 1994
PubMed
Summary

Tendon fibroblasts create compartments to manage collagen fibril assembly. Fibril segments fuse and grow, forming mature collagen structures during avian tendon development.

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Area of Science:

  • Connective tissue biology
  • Developmental biology
  • Biochemistry

Background:

  • The extracellular matrix (ECM) is crucial for tissue structure and function.
  • Collagen is the primary structural protein in tendons, providing tensile strength.
  • Understanding collagen fibril assembly is key to tendon development and repair.

Purpose of the Study:

  • To investigate the mechanisms of collagen fibril growth during tendon development.
  • To determine how tendon fibroblasts influence ECM assembly.
  • To characterize the structural intermediates in collagen fibril formation.

Main Methods:

  • Structural, immunochemical, and biochemical analyses of developing avian metatarsal tendons.
  • Isolation and characterization of collagen fibril segments using transmission electron microscopy.
  • Assessment of segment length and extractability during embryonic development (12-18 days).

Main Results:

  • Tendon fibroblasts establish distinct extracellular compartments for matrix assembly.
  • A discontinuous fibrillar matrix composed of segments (10-20 microns) is initially deposited.
  • Segment length increased from 22 to 33 microns between 12-15 days, with fusion observed.
  • By 16-18 days, segments became unextractable, indicating mature fibril formation and increased diameter.

Conclusions:

  • Fibroblast-defined compartments regulate extracellular matrix assembly.
  • Collagen fibril segments serve as intermediates for orderly fibril development and growth.
  • Lateral and/or linear fusion of these segments leads to the formation of mature, continuous collagen fibrils.

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