Interleukin‐22 treatment ameliorates alcoholic liver injury in a murine model of chronic‐binge ethanol feeding: Role of signal transducer and activator of transcription 3

• Published in: Hepatology (Baltimore, Md.) Vol. 52; no. 4; pp. 1291 - 1300
• Main Authors: Ki, Sung Hwan, Park, Oygi, Zheng, Mingquan, Morales‐Ibanez, Oriol, Kolls, Jay K., Bataller, Ramon, Gao, Bin
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.10.2010; Wiley; Wolters Kluwer Health, Inc
• Subjects: Addictive behaviors; Adenovirus; Adult and adolescent clinical studies; Alanine Transaminase - blood; Alcohol; Alcoholism; Alcoholism - metabolism; Alcoholism and acute alcohol poisoning; Animals; Aspartate Aminotransferases; Biological and medical sciences; Cytokines; Disease Models, Animal; Down-Regulation; Ethanol - poisoning; Fatty Acid Transport Proteins - biosynthesis; Fatty Liver, Alcoholic - prevention & control; Gastroenterology. Liver. Pancreas. Abdomen; Hepatology; Humans; Interleukin-22; Interleukins - therapeutic use; Liver - drug effects; Liver - pathology; Liver cirrhosis; Liver Diseases, Alcoholic - prevention & control; Liver. Biliary tract. Portal circulation. Exocrine pancreas; Male; Medical sciences; Mice; Mice, Inbred C57BL; Mice, Knockout; Oxidative stress; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Receptors, Interleukin - biosynthesis; Rodents; STAT3 Transcription Factor - deficiency; STAT3 Transcription Factor - physiology; Toxicology; Up-Regulation; Ethanol; Transcription; Alcoholism; Liver; Rodentia; Feeding; Transducer; Vertebrata; Chronic; Mammalia; Treatment; Mouse; Animal; Gastroenterology; Models
• ISSN: 0270-9139; 1527-3350; 1527-3350
• DOI: 10.1002/hep.23837

Interleukin‐22 (IL‐22), a recently identified member of the IL‐10 family of cytokines that is produced by Th17 and natural killer cells, plays an important role in controlling bacterial infection, homeostasis, and tissue repair. Here, we tested the effect of IL‐22 on alcohol‐induced liver injury in a murine model of chronic‐binge ethanol feeding. Feeding male C57BL/6 mice with a Lieber‐DeCarli diet containing 5% ethanol for 10 days, followed by a single dose of ethanol (5 g/kg body weight) by gavage, induces significant fatty liver and liver injury with peak serum levels of approximately 250 IU/L alanine aminotransferase and 420 IU/L aspartate aminotransferase 9 hours after gavage. Moreover, chronic‐binge ethanol administration increases expression of hepatic and serum inflammatory cytokines and hepatic oxidative stress. Using this model, we demonstrate that treatment with IL‐22 recombinant protein activates hepatic signal transducer and activator of transcription 3 (STAT3) and ameliorates alcoholic fatty liver, liver injury, and hepatic oxidative stress. Administration with IL‐22 adenovirus also prevents alcohol‐induced steatosis and liver injury. Deletion of STAT3 in hepatocytes abolishes the hepatoprotection provided by IL‐22 in alcoholic liver injury. In addition, IL‐22 treatment down‐regulates the hepatic expression of fatty acid transport protein, but up‐regulates several antioxidant, antiapoptotic, and antimicrobial genes. Finally, expression of IL‐22 receptor 1 is up‐regulated whereas IL‐22 is undetectable in the livers from mice with chronic‐binge ethanol feeding or patients with alcoholic hepatitis. Conclusion: Chronic‐binge ethanol feeding may be a useful model to study the early stages of alcoholic liver injury. IL‐22 treatment could be a potential therapeutic option to ameliorate alcoholic liver disease, due to its antioxidant, antiapoptotic, antisteatotic, proliferative, and antimicrobial effects with the added benefit of potentially few side effects. HEPATOLOGY 2010