The Role of Serpinb9/serine Protease Inhibitor 6 in Preventing Granzyme B-dependent Hepatotoxicity

Overview

Journal Hepatology

Specialty Gastroenterology

Date 2007 Aug 10

PMID 17685438

Citations 13

Authors

Heather W Stout-Delgado

Yonas Getachew

Thomas E Rogers

Bonnie C Miller

Dwain L Thiele

Affiliations

Soon will be listed here.

Abstract

Unlabelled: Virally infected hepatocytes are resistant to cytotoxic lymphocyte killing by perforin-dependent and granzyme-dependent effector mechanisms. The present studies were designed to examine the role of serine protease inhibitor 6 (SPI-6) in limiting granzyme B-dependent cytotoxic effector mechanisms in the liver. SPI-6-specific small interfering RNA (siRNA) administration to C57Bl/6J (B6) mice elicited transient alanine aminotransferase (ALT) elevations that were not observed in either granzyme B-deficient B6 (B6.gzmb(-/-)) or natural killer (NK) cell-depleted B6 mice. When SPI-6 expression was abolished by siRNA administration at the time of infection with a recombinant, replication-deficient adenovirus [E1-deleted adenovirus encoding beta-galactosidase (AdCMV-LacZ)], earlier and dramatically increased, and earlier ALT elevations were observed in wild-type B6 but not in B6.gzmb(-/-) or NK cell-depleted mice. When a 3-fold higher dose of AdCMV-LacZ was administered to B6 mice, the coadministration of SPI-6 siRNA resulted in the early onset of lethal, acute liver failure. Of note, the accelerated clearance of AdCMV-LacZ was observed in recipients of SPI-6 siRNA.

Conclusion: These results indicate that the regulated expression of SPI-6 in hepatocytes during viral infection or following noninfectious causes of liver injury protects hepatocytes against excessively vigorous granzyme B-dependent killing but may also delay immune clearance of virally infected hepatocytes.

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