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Review
. 2011 May 28;17(20):2500-6.
doi: 10.3748/wjg.v17.i20.2500.

Mechanisms of alcohol-mediated hepatotoxicity in human-immunodeficiency-virus-infected patients

Affiliations
Review

Mechanisms of alcohol-mediated hepatotoxicity in human-immunodeficiency-virus-infected patients

Gyongyi Szabo et al. World J Gastroenterol. .

Abstract

Clinical observations have demonstrated that excessive chronic alcohol use negatively affects human immunodeficiency virus (HIV) infection and contributes to the liver manifestations of the disease, even in HIV mono-infection. HIV/hepatitis C virus (HCV) co-infection is associated with increased progression of HVC liver disease compared to HCV infection alone, and both of these are negatively affected by alcohol use. Recent data suggest that alcohol use and HIV infection have common targets that contribute to progression of liver disease. Both HIV infection and chronic alcohol use are associated with increased gut permeability and elevated plasma levels of lipopolysaccharide; a central activator of inflammatory responses. Both alcoholic liver disease and HIV infection result in non-specific activation of innate immunity, proinflammatory cytokine cascade upregulation, as well as impaired antigen presenting cell and dendritic cell functions. Finally, alcohol, HIV and antiretroviral therapy affect hepatocyte functions, which contributes to liver damage. The common targets of alcohol and HIV infection in liver disease are discussed in this mini-review.

Keywords: Hepatitis B virus; Hepatitis C virus; Inflammation; Intestine; Liver.

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Figures

Figure 1
Figure 1
Alcohol and human immunodeficiency virus in liver disease. There are multiple common sites of action of alcohol and human immunodeficiency virus (HIV) infection that contribute to the development of liver disease. These include modification of immune functions and inflammatory responses, functions of hepatocytes and intestinal permeability.
Figure 2
Figure 2
Alcohol-induced hepatocyte damage is amplified by human immunodeficiency virus infection. The current model of alcohol-induced liver disease includes increased gut-derived lipopolysaccharide (LPS) entry into the liver where Kupffer cells are activated via LPS/Toll-like receptor (TLR) 4 and produce tumor necrosis factor (TNF)α. Human immunodeficiency virus (HIV) infection also increases gut-derived LPS levels in the circulating blood. Increased production of TNFα will act on alcohol-exposed hepatocytes to induce apoptosis. ROS: Reactive oxygen species.

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