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Related Experiment Videos

Thrombin effects on osteoblastic cells. II. Structure-function relationships.

D N Tatakis1, C Dolce, R Dziak

  • 1Department of Oral Biology, School of Dental Medicine, State University of New York, Buffalo 14214.

Biochemical and Biophysical Research Communications
|January 15, 1991
PubMed
Summary
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Thrombin

Area of Science:

  • Biochemistry
  • Cell Biology
  • Bone Biology

Background:

  • Thrombin, a key enzyme in coagulation, influences bone metabolism.
  • Previous studies indicate thrombin's role in bone resorption and osteoblast activity.

Purpose of the Study:

  • To investigate the critical role of thrombin's active site in its effects on osteoblastic cells.
  • To determine if catalytic activity is essential for thrombin's influence on bone cells.

Main Methods:

  • Utilized specific thrombin inhibitors (hirudin, PMSF) to block active site activity.
  • Assessed effects on human osteosarcoma cell lines (G292, Saos-2) and primary rat osteoblasts.
  • Measured cell proliferation, phosphoinositide turnover, and cytosolic calcium levels.

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Main Results:

  • Thrombin inhibitors dose-dependently blocked thrombin-induced cell proliferation, calcium signaling, and phosphoinositide metabolism.
  • Inhibitors alone did not affect basal osteoblast function.
  • Proteolytic forms of thrombin (zeta, gamma) also stimulated osteoblastic cells, suggesting active site involvement.

Conclusions:

  • Thrombin's actions on osteoblast-like cells are critically dependent on its catalytic site.
  • The active site of thrombin is essential for mediating its effects on bone cell proliferation and signaling pathways.