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Anti‐integrin antibodies induce type IV collagenase expression in keratinocytes
Author(s) -
Larjava Hannu,
Lyons J. Guy,
Salo Tuula,
Mäkelä Marja,
Koivisto Leeni,
BirkedalHansen Henning,
Akiyama Steven K.,
Yamada Kenneth M.,
Heino Jyrki
Publication year - 1993
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041570125
Subject(s) - integrin , fibronectin , collagenase , vitronectin , laminin , microbiology and biotechnology , collagen receptor , antibody , receptor , type iv collagen , biology , chemistry , extracellular matrix , biochemistry , immunology , enzyme
During wound healing, pericellular proteolysis is thought to be essential for the detachment of keratinocytes from basement membrane and in their migration into the wound bed. We have characterized integrin‐type cell adhesion/migration receptors in human mucosal keratinocytes and examined their function in the regulation of type IV collagenase gene expression. Two major integrins of the β1 class, α2β1 and αβ1, were found to function as collagen and fibronectin receptors, respectively. Antibodies against β1 and α3 integrin subunits were found to stimulate the expression of the 92 kDa type IV collagenase severalfold in a dosedependent manner. Keratinocytes expressed also the 72 kDa type IV collagenase, the synthesis of which remained, however, unchanged in keratinocytes treated with anti‐integrin antibodies. Stimulation of 92 kDa enzyme was found to be caused directly by antibody binding to integrins, since Fab‐fragments of anti‐β1 antibodies alone were able to induce collagenase expression in the absence of secondary, clustering antibodies. Antibodies against α2β1 integrin caused no stimulation. Keratinocytes seeded on different substrata (plastic, collagen, fibronectin, laminin, or vitronectin) showed equal induction of type IV collagenase expression. Expression of 92 kDa type IV collagenase could not be induced by peptides (GRGDS, GRGES), proteins (fibronectin, laminin, fibrinogen., albumin), or antibodies to fibronectin. We suggest that proteolytic processes around keratinocytes can be regulated by extracellular factors signalling through integrin‐type receptors. © 1993 Wiley‐Liss, Inc.