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2018 ; 8
(1
): 7306
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Isozyme-specific comprehensive characterization of transglutaminase-crosslinked
substrates in kidney fibrosis
#MMPMID29743665
Tatsukawa H
; Otsu R
; Tani Y
; Wakita R
; Hitomi K
Sci Rep
2018[May]; 8
(1
): 7306
PMID29743665
show ga
Chronic kidney disease is characterized by prolonged decline in renal function,
excessive accumulation of ECM, and progressive tissue fibrosis. Transglutaminase
(TG) is a crosslinking enzyme that catalyzes the formation of covalent bonds
between glutamine and lysine residues, and is involved in the induction of renal
fibrosis via the stabilization of ECM and the activation of TGF-?1. Despite the
accumulating evidences indicating that TG2 is a key enzyme in fibrosis, genetic
knockout of TG2 reduced by only 50% the elevated protein crosslinking and fibrous
protein in renal fibrosis model, whereas treatment with TG inhibitor almost
completely reduced these levels. Here, we also clarified the distributions of TG
isozymes and their in situ activities and identified the isozyme-specific
crosslinked substrates for both TG1 and TG2 in fibrotic kidney. We found that TG1
activity was markedly enhanced in renal tubular epithelium and interstitial
areas, whereas TG2 activity increased only in the extracellular space. In total,
47 and 67 possible candidates were identified as TG1 and TG2 substrates,
respectively, only in fibrotic kidney. Among them, several possible substrates
related to renal disease and fibrosis were identified. These findings provide
novel insights into the mechanisms of renal fibrosis through the targeting of
isozyme-specific TG substrates.