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Osteoblast low-molecular-weight proteinase inhibitor I. Isolation and characterization of activity from osteoblastic cells and bone

  • Molecular and Cellular Biology
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Summary

Isolated mouse calvarial cells having phenotypic characteristics of osteoblasts, mouse parietal bone segments, mouse serum, and control mouse lung fibroblasts were extracted in NaCl and ultrafiltered to recover final concentrates having nominal molecular weights between 50,000 and 1000 daltons. Final concentrates of osteoblasts and bone but not of serum or control fibroblasts were positive for the inhibition of trypsin degradation of fibrin. Osteoblast final concentrates inhibited trypsin hydrolysis of the synthetic substratep-tosyl-l-arginine methyl ester. Osteoblast and bone final concentrates comigrated with Trasylol but were electrophoretically distinct from alphal-antiproteinase. Final concentrates of osteoblast and bone extracts did not inhibit tadpole collagenase using the [3H]glycine-labeled diffuse chick collagen fibril assay. High-performance liquid chromatography (HPLC) of osteoblast final concentrates after purification using immobilized trypsin affinity chromatography revealed the presence of a major peak that was positive for the inhibition of trypsin. Molecular weight determination by HPLC indicated that the inhibitor(s) range in nominal molecular weight from 4300 to 5100 daltons. The presence of low-molecular-weight serine proteinase inhibitory activity in bone suggests its participation in the regulation of bone resorption through the regulation of enzyme activation of collagenase, and possibly its role in defense against bone matrix enzymatic degradation during tumor cell invasion.

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Authors and Affiliations

  1. Department of Biology, Loyola University of Chicago, 6525 N. Sheridan Road, 60626, Chicago, Illinois, USA

    Frederick H. Wezeman Ph.D. & Janice Corey

  2. Department of Anesthesiology, Cook County Hospital, 6525 N. Sheridan Road, 60626, Chicago, Illinois, USA

    Beverly Waxler

Authors
  1. Frederick H. Wezeman Ph.D.
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  2. Janice Corey
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  3. Beverly Waxler
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Wezeman, F.H., Corey, J. & Waxler, B. Osteoblast low-molecular-weight proteinase inhibitor I. Isolation and characterization of activity from osteoblastic cells and bone. Calcif Tissue Int 46, 263–269 (1990). https://doi.org/10.1007/BF02555006

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  • DOI: https://doi.org/10.1007/BF02555006

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