Ethanol Plus the Jo2 Fas Agonistic Antibody-Induced Liver Injury is Attenuated in Mice with Partial Ablation of Argininosuccinate Synthase
Article first published online: 13 NOV 2013
Copyright © 2013 by the Research Society on Alcoholism
Alcoholism: Clinical and Experimental Research
Volume 38, Issue 3, pages 649–656, March 2014
How to Cite
Lu, Y., Ward, S. C. and Nieto, N. (2014), Ethanol Plus the Jo2 Fas Agonistic Antibody-Induced Liver Injury is Attenuated in Mice with Partial Ablation of Argininosuccinate Synthase. Alcoholism: Clinical and Experimental Research, 38: 649–656. doi: 10.1111/acer.12309
- Issue published online: 15 MAR 2014
- Article first published online: 13 NOV 2013
- Manuscript Accepted: 24 SEP 2013
- Manuscript Received: 28 MAY 2013
- National Institute on Alcohol Abuse and Alcoholism. Grant Numbers: 5 R01 AA017733, 5 R01 AA017733-01S1, 5 P20 AA017067, 5 P20 AA017067-01S1, 5 P20 AA017067-03S1
- Nitrosative Stress;
- Nitric Oxide Synthase 2;
- Urea Cycle;
- l-Citrulline/NO· Cycle
Argininosuccinate synthase (ASS) is an enzyme shared by the urea cycle and the l-citrulline/nitric oxide (NO·) cycle. ASS is the rate-limiting enzyme in the urea cycle and along with nitric oxide synthase 2 (NOS2), it endows cells with the l-citrulline/NO· salvage pathway to continuously supply l-arginine from l-citrulline for sustained NO· generation. Thus, ASS conditions NO· synthesis by NOS2. Because of the relevance of NOS2 activation for liver injury, we examined the contribution of ASS to NO· generation and how it impacts liver injury.
Wild-type (WT) mice and Ass+/− mice (Ass−/− mice are lethal) were intraperitoneally injected with ethanol (EtOH) at a dose of 2.5 g/kg of body weight twice a day for 3 days. Two hours after the last dose of EtOH, mice were administered the agonistic Jo2 anti-mouse Fas monoclonal antibody (Ab) at a dose of 0.2 μg/g of body weight. Mice were sacrificed 8 hours after the Jo2 Ab injection. Markers of nitrosative and oxidative stress as well as liver damage were analyzed.
EtOH plus Jo2 injection induced liver injury as shown by serum alanine aminotransferase and aspartate aminotransferase activity, liver pathology, TUNEL, and cleaved caspase-3 were lower in Ass+/− mice compared with WT mice, suggesting that ASS contributes to EtOH plus Jo2-mediated liver injury. CYP2E1 induction, glutathione depletion, and elevated thiobarbituric acid reactive substances were comparable in both groups of mice, suggesting that CYP2E1-mediated oxidative stress is not linked to ASS-induced liver injury. In contrast, NOS2 induction, 3-nitrotyrosine adducts formation and elevated nitrites, nitrates, and S-nitrosothiols were higher in livers from WT mice than from Ass+/− mice.
Decreased nitrosative stress causes lower EtOH plus Jo2-induced liver injury in Ass+/− mice.