The serpin alpha1-proteinase inhibitor is a critical substrate for gelatinase B/MMP-9 in vivo.
We have identified the key protein substrate of gelatinase B/MMP-9 (GB) that is cleaved in vivo during dermal-epidermal separation triggered by antibodies to the hemidesmosomal protein BP180 (collagen XVII, BPAG2). Mice deficient in either GB or neutrophil elastase (NE) are resistant to blister formation in response to these antibodies in a mouse model of the autoimmune disease bullous pemphigoid. Disease develops upon complementation of GB -/- mice with NE -/- neutrophils or NE -/- mice with GB -/- neutrophils. Only NE degrades BP180 and produces dermal-epidermal separation in vivo and in culture. Instead, GB acts upstream to regulates NE activity by inactivating alpha1-proteinase inhibitor (alpha1-PI). Excess NE produces lesions in GB -/- mice without cleaving alpha1-PI. Excess alpha1-PI phenocopies GB and NE deficiency in wild-type mice.
Liu
Z
Z
Department of Dermatology, University of North Carolina, Chapel Hill 27599, USA. zhiliu@med.unc.edu
Zhou
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X
Shapiro
S D
SD
Shipley
J M
JM
Twining
S S
SS
Diaz
L A
LA
Senior
R M
RM
Werb
Z
Z
D000818:Animals; D000831:Animals, Newborn; D000906:Antibodies / Q000276:immunology / Q000494:pharmacology; D001324:Autoantigens / Q000276:immunology / Q000378:metabolism; D001768:Blister / Q000139:chemically induced / Q000201:enzymology / Q000276:immunology / Q000473:pathology; D002448:Cell Adhesion; D020405:Dermis / Q000187:drug effects / Q000201:enzymology / Q000276:immunology / Q000473:pathology; D004195:Disease Models, Animal; D004817:Epidermis / Q000187:drug effects / Q000201:enzymology / Q000276:immunology / Q000473:pathology; D019272:Leukocyte Elastase / Q000172:deficiency / Q000235:genetics / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D020556:Neutrophil Infiltration; D009504:Neutrophils / Q000187:drug effects / Q000201:enzymology / Q000276:immunology; D024041:Non-Fibrillar Collagens; D010391:Pemphigoid, Bullous / Q000139:chemically induced / Q000201:enzymology* / Q000276:immunology / Q000473:pathology; D009195:Peroxidase / Q000378:metabolism; D011499:Protein Processing, Post-Translational; D013379:Substrate Specificity; D000515:alpha 1-Antitrypsin / Q000378:metabolism*; D000097805:Collagen Type XVII
D000906:Antibodies; D001324:Autoantigens; D019272:Leukocyte Elastase; D020780:Matrix Metalloproteinase 9; D024041:Non-Fibrillar Collagens; D009195:Peroxidase; D000515:alpha 1-Antitrypsin; D000097805:Collagen Type XVII