Alcohol in alcoholic liver disease is a causative factor for development of allergic skin manifestations.

BACKGROUND We frequently observed allergic skin reactions in patients with documented history of alcoholic liver disease (ALD). To assess the potential association between alcohol-induced liver damage and urticaria a prospective randomized trial investigating immunologic parameters in various stages of alcoholic liver disease was designed. Fifty patients were available for analysis. METHODS By means of a multivariate discriminant analysis seven out of a number of laboratory and clinical parameters (level of serum proteins, serum globulins, gamma globulins, albumin/globulin ratio, and immunoglobulins A, E, and G) have been found important for analysis. They were compared with age, general clinical status, degree of progression of alcoholic liver disease, and frequency of appearance of type I skin reactions. Results were further processed by means of logistic general linear models, Chi-square test, and summarized in a structural equation model. RESULTS Alcoholic liver disease does not influence IgA, IgG, and A/G Index directly, but it increases levels of IgE. About 13% of variance of IgA, IgG, and A/G Index are affected by group membership only in non-alcoholic liver disease, and 27% of variance of IgE can be explained by alcoholic liver disease. There were striking differences in IgE content between alcoholic liver disease and control groups. Degree of liver disease had a negative impact on A/G Index, and on IgA, and a positive on IgG. About 16% of variance can be explained by degree of liver disease. IgE is not degree related. Alcoholic liver disease as a disease was found as the most important predictor of skin reactivity (p = 0.0046). Of all immunologic parameters investigated IgE followed by A/G Index was found as the most significant predictor of allergic skin reactions. The extent of alcoholic liver disease plays not a role in allergic skin manifestations. Alcoholic nature of liver disease itself is a significant factor causing allergic skin reactions (p = 0.0002), but alcoholism itself as an independent factor contributes to increased incidence of skin allergies. CONCLUSIONS Alcoholic liver disease plays an important role in development of type I allergic skin manifestations. This effect has a direct mechanism through alcohol itself, and an indirect through elevation of IgE. Alcohol in liver disease and not liver disease causes immunologic abnormalities and accounts significantly for increased appearance of allergic skin reactions regardless of the extent of underlying liver disease.