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J Biol Chem, Vol. 274, Issue 43, 30715-30721, October 22, 1999
,
From the The transglutaminase (TGase) family of enzymes,
of which seven different members are known in the human genome,
participate in many biological processes involving cross-linking
proteins into large macromolecular assemblies. The TGase 2 enzyme is
known to be present in neuronal tissues and may play a role in neuronal degenerative diseases such as Alzheimer's disease (AD) by aberrantly cross-linking proteins. In this paper, we demonstrate by reverse transcriptase-polymerase chain reaction and immunological methods with
specific antibodies that in fact three members, the TGase 1, TGase 2, and TGase 3 enzymes, and are differentially expressed in various
regions of normal human brain tissues. Interestingly, the TGase 1 and 3 enzymes and their proteolytically processed forms are involved in
terminal differentiation programs of epithelial cell development and
barrier function. In addition, we found that the levels of expression
and activity of the TGase 1 and 2 enzymes were both increased in the
cortex and cerebellum of AD patients. Furthermore, whereas normal brain
tissues contain
Laboratory of Skin Biology,
1 residue of cross-link/10,000 residues, AD patient
cortex and cerebellum tissues contain 30-50 residues of
cross-link/10,000 residues. Together, these findings suggest that
multiple TGase enzymes are involved in normal neuronal structure and
function, but their elevated expression and cross-linking activity may
also contribute to neuronal degenerative disease.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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