Document Detail

Inhibition of human mast cell chymase by secretory leukocyte proteinase inhibitor: enhancement of the interaction by heparin.
MedLine Citation:
PMID:  8615699     Owner:  NLM     Status:  MEDLINE    
The inhibition of human chymase, a chymotrypsin-like proteinase stored in mast cell granules, by secretory leukocyte proteinase inhibitor (SLPI) is investigated in this study. SLPI is a serine proteinase inhibitor present in human mucus secretions and tissues. It binds heparin, a highly sulfated glycosaminoglycan also found in mast cell secretary granules, and the interaction increases its effectiveness as an inhibitor of neutrophil elastase. Analysis of the chymase-SL interaction by equilibrium and kinetic methods indicates that the inhibition of chymase results from the reversible formation of a stable 1:1 enzyme-inhibitor complex. The dissociation equilibrium constant (determined in reactions containing 0.18 M or 1.0M NaCl (pH 8.0, 25 degrees C) was 5 X 10(-8) and 2 x 10(-8) M, respectively. Addition of heparin to the low-salt reaction decreased the Ki approximately 10-fold to a value of 3 x 10(-9) M, making SLPI a more effective inhibitor of human chymase. The decrease was due primarily to an approximately 10-fold increase in the association rate constant (kass) from 2 X 10(4) to 3 X 10(5) M-1 s-1. The magnitudes of the rate and dissociation equilibrium constants indicate that SLPI has the potential to be a good chymase inhibitor in vivo, especially if chymase and heparin are released from mast cell granules simultaneously. The enhanced interaction in the presence of heparin supports the importance of this glycosaminoglycan to the inhibitory function of SLPI.
M Walter; M Plotnick; N M Schechter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Archives of biochemistry and biophysics     Volume:  327     ISSN:  0003-9861     ISO Abbreviation:  Arch. Biochem. Biophys.     Publication Date:  1996 Mar 
Date Detail:
Created Date:  1996-06-05     Completed Date:  1996-06-05     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0372430     Medline TA:  Arch Biochem Biophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  81-8     Citation Subset:  IM    
Department of Dermatology, University of Pennsylvania, Philadelphia 19104, USA.
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MeSH Terms
Chymotrypsin / antagonists & inhibitors*
Glycosaminoglycans / pharmacology
Heparin / pharmacology
Mast Cells / enzymology*
Pancreas / enzymology
Proteinase Inhibitory Proteins, Secretory
Proteins / pharmacology*
Secretory Leukocyte Peptidase Inhibitor
Serine Endopeptidases / metabolism*
Serine Proteinase Inhibitors / pharmacology*
Sodium Chloride / pharmacology
Grant Support
Reg. No./Substance:
0/Glycosaminoglycans; 0/Proteinase Inhibitory Proteins, Secretory; 0/Proteins; 0/SLPI protein, human; 0/Secretory Leukocyte Peptidase Inhibitor; 0/Serine Proteinase Inhibitors; 7647-14-5/Sodium Chloride; 9005-49-6/Heparin; EC 3.4.21.-/Serine Endopeptidases; EC; EC

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