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Matrix metalloproteinases and TIMP-1 production by peripheral blood granulocytes from COPD patients and asthmatics

D Cataldo1, C Munaut, A Noël

  • 1Department of Pneumology, University of Liège, Belgium.

Allergy
|February 13, 2001
PubMed

Insights

Granulocytes from asthma and COPD patients do not show abnormal matrix metalloproteinase-9 (MMP-9) secretion. However, asthmatic granulocytes exhibit impaired release of tissue inhibitor of metalloproteinase-1 (TIMP-1) upon stimulation.

Area of Science:

  • Respiratory Medicine
  • Immunology
  • Biochemistry

Background:

  • Increased granulocytes and matrix metalloproteinase-9 (MMP-9) are observed in asthma and COPD airways.
  • The role of granulocyte secretion in elevated MMP-9 and TIMP-1 levels in these conditions requires investigation.

Purpose of the Study:

  • To investigate if granulocytes from asthma and COPD patients exhibit altered secretion of MMP-9 and TIMP-1.
  • To compare MMP-9 and TIMP-1 secretion in granulocytes from healthy individuals, asthmatics, and COPD patients.

Main Methods:

  • Isolated blood granulocytes from healthy subjects, asthmatics, and COPD patients.
  • Cultured granulocytes under basal conditions and stimulated with PMA or fMLP.
  • Assessed MMP-9 activity via zymography and MMP-8 and TIMP-1 levels using ELISA.

Main Results:

  • MMP-9 (pro- and activated forms) was present in all groups.
  • Granulocyte stimulation with fMLP and PMA similarly increased MMP-9 release across all groups.
  • TIMP-1 levels increased post-stimulation in healthy subjects and COPD patients, but not significantly in asthmatics.

Conclusions:

  • Circulating granulocytes in COPD and asthmatic patients do not show abnormal MMP-9 secretion.
  • Granulocytes from asthmatic patients demonstrate an impaired capacity for TIMP-1 release upon stimulation.

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