Serpina3n attenuates granzyme B-mediated decorin cleavage and rupture in a murine model of aortic aneurysm.

Abstract:

:Granzyme B (GZMB) is a proapoptotic serine protease that is released by cytotoxic lymphocytes. However, GZMB can also be produced by other cell types and is capable of cleaving extracellular matrix (ECM) proteins. GZMB contributes to abdominal aortic aneurysm (AAA) through an extracellular, perforin-independent mechanism involving ECM cleavage. The murine serine protease inhibitor, Serpina3n (SA3N), is an extracellular inhibitor of GZMB. In the present study, administration of SA3N was assessed using a mouse Angiotensin II-induced AAA model. Mice were injected with SA3N (0-120 μg/kg) before pump implantation. A significant dose-dependent reduction in the frequency of aortic rupture and death was observed in mice that received SA3N treatment compared with controls. Reduced degradation of the proteoglycan decorin was observed while collagen density was increased in the aortas of mice receiving SA3N treatment compared with controls. In vitro studies confirmed that decorin, which regulates collagen spacing and fibrillogenesis, is cleaved by GZMB and that its cleavage can be prevented by SA3N. In conclusion, SA3N inhibits GZMB-mediated decorin degradation leading to enhanced collagen remodelling and reinforcement of the adventitia, thereby reducing the overall rate of rupture and death in a mouse model of AAA.

journal_name

Cell Death Dis

journal_title

Cell death & disease

authors

Ang LS,Boivin WA,Williams SJ,Zhao H,Abraham T,Carmine-Simmen K,McManus BM,Bleackley RC,Granville DJ

doi

10.1038/cddis.2011.88

subject

Has Abstract

pub_date

2011-09-08 00:00:00

pages

e209

issn

2041-4889

pii

cddis201188

journal_volume

2

pub_type

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