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Osteopontin is proteolytically processed by matrix metalloproteinase 9.

Merry L Lindsey1,2,3, Fouad A Zouein1,2, Yuan Tian1,2

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Canadian Journal of Physiology and Pharmacology
|July 16, 2015
PubMed
Summary

Osteopontin protects the heart after myocardial infarction (MI) by producing specific peptides. Mapping matrix metalloproteinase (MMP) cleavage sites revealed distinct functions for these osteopontin-derived fragments.

Keywords:
MMP-9MPM-9cardiaccardiaquecleavage sitesfibroblastesfibroblastsinfarctus du myocardemass spectrometrymatrix metalloproteinasesmyocardial infarctionmétalloprotéinases matriciellesosteopontinostéopontinepeptidesproteomicsprotéomiquesites de clivagespectométrie de masse

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Area of Science:

  • Cardiovascular Biology
  • Proteomics
  • Molecular Medicine

Background:

  • Osteopontin (OPN) is upregulated after myocardial infarction (MI), indicating a role in left ventricular (LV) remodeling.
  • OPN deficiency worsens cardiac function post-MI, suggesting protective effects, but the underlying mechanisms remain unclear.
  • Matrix metalloproteinases (MMPs) are key regulators of LV remodeling, and OPN is a known substrate for MMP-2, -3, -7, and -9.

Purpose of the Study:

  • To map the cleavage sites of MMPs on osteopontin.
  • To investigate the biological functions of OPN-derived peptides generated by specific MMP cleavage.
  • To elucidate the mechanisms of OPN's protective role in post-MI cardiac remodeling.

Main Methods:

  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to map MMP-9 cleavage sites on OPN, comparing results with MMP-2, -3, and -7.
  • Label-free and N-terminal labeling techniques were employed for precise cleavage site identification.
  • Synthetic peptides representing OPN fragments were generated and tested for biological activity in cardiac fibroblasts.

Main Results:

  • Each MMP enzyme exhibited a unique cleavage profile on OPN, with minimal overlap in cleavage sites.
  • Three specific MMP-9 cleavage sites on OPN were validated: positions 151-152, 193-194, and 195-196.
  • Two synthesized OPN-derived peptides significantly enhanced cardiac fibroblast migration post-wounding, demonstrating distinct biological activities.

Conclusions:

  • Osteopontin processing by different MMPs generates peptides with unique biological functions.
  • Understanding OPN cleavage is crucial for elucidating its protective mechanisms in post-MI cardiac remodeling.
  • Specific OPN fragments may represent novel therapeutic targets for cardiovascular diseases.