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Convertase Enzyme from Human Arthritis-Affected Cartilage: Isolation of cDNA by Differential Display, Expression of the Active Enzyme, and Regulation of TNF-
1


*
Department of Rheumatology and Medicine, and
Department of Orthopedic Surgery, Hospital for Joint Diseases, New York, NY;
Skirball Institute of Biomolecular Medicine, Departments of
§
Medicine and
¶
Pathology, and
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Kaplan Cancer Research Center, New York University Medical Center, New York, NY 10016.
A snake venom-like protease isolated by a differential display
screen between normal and osteoarthritis (OA)-affected cartilage
(designated as cSVP) has a cDNA sequence identical to TNF-
convertase enzyme (TACE). TACE shows the presence of an unknown
prodomain, a cysteine switch, a catalytic domain, a zinc binding
region, a disintegrin region, an EGF-like domain, a transmembrane
domain, and a unique cytoplasmic region. A TACE construct harboring the
signal + prodomain + catalytic region (TACE-SPC
DETCy),
expressed in baculovirus could cleave preferentially (
12-fold) the
TNF-specific peptide over the matrix metalloproteases peptide in vitro.
This recombinant protein also cleaved the natural substrate
GST-ProTNF-
to TNF-
(17 kDa) in vitro. The mRNA for TACE, which
is broadly distributed and differentially expressed in a variety of
human tissues, is up-regulated in arthritis-affected cartilage, but not
normal cartilage. OA-affected cartilage also expressed TNF-
mRNA
that was not detected in normal cartilage. The OA-affected cartilage
(in explant assays) spontaneously released TNF-
and IL-8 in ex vivo
conditions. Addition of TNF-
R fused to IgG Fc fragment (TNF-
R:Fc)
in the presence or absence of soluble IL-1R (with which it acted
additively) significantly attenuated the spontaneous/autocrine release
of articular IL-8 in this assay. These experiments demonstrate a
functional paracrine/autocrine role of TNF-
in OA-affected cartilage
that may depend, in part, on up-regulated levels of chondrocyte-derived
TACE.
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