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The similarity of alcoholic liver disease and nonalcoholic steatohepatitis (NASH) in terms of pathogenic mechanisms suggests that immunoglobulin A (IgA) may play an important role in the pathogenesis of NASH. We aimed to determine whether serum IgA concentrations allow a diagnosis of liver fibrosis in NASH.
We compared serum IgA concentrations between 108 patients with stages 0-2 NASH and 19 patients with stage 3 NASH.
In a univariate analysis, age (P < 0.0001), gender (P = 0.0039), serum albumin level (P = 0.0192), AST (P < 0.0001), AST/ALT ratio (P < 0.0001), platelet count (P = 0.0027), hyaluronic acid level (P < 0.0001), fasting blood sugar (FBS) (P = 0.0013), IRI (P = 0.0001), prothrombin time (%) (P = 0.0287), IgA (P < 0.0001), total sum of IgG, IgA, and IgM (P = 0.0049), and IgA/(IgG + IgA + IgM) (P = 0.0105) were significantly elevated in severe-stage NASH patients compared with the early-stage NASH group. Multiple logistic regression analysis showed that in severe-stage NASH patients, only serum IgA concentrations were significantly elevated (P = 0.0225) relative to early-stage NASH patients. The area under the curve (AUC) of serum IgA concentrations was 0.758 for detecting severe-stage NASH compared with early-stage NASH.
Serum IgA concentration could be a useful independent predictor for assessing the pre-cirrhotic progression of NASH.
Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan, firstname.lastname@example.org.
This article was published in the following journal.
Name: Digestive diseases and sciences
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A tetrameric protein, molecular weight between 50,000 and 70,000, consisting of 4 equal chains, and migrating on electrophoresis in 3 fractions more mobile than serum albumin. Its concentration ranges from 7 to 33 per cent in the serum, but levels decrease in liver disease.
Represents 15-20% of the human serum immunoglobulins, mostly as the 4-chain polymer in humans or dimer in other mammals. Secretory IgA (IMMUNOGLOBULIN A, SECRETORY) is the main immunoglobulin in secretions.
A rare inherited immunodeficiency syndrome characterized by normal or elevated serum IMMUNOGLOBULIN M levels with absence of IMMUNOGLOBULIN G; IMMUNOGLOBULIN A; and IMMUNOGLOBULIN E. It results in a profound susceptibility to BACTERIAL INFECTIONS and an increased susceptibility to OPPORTUNISTIC INFECTIONS. Several subtypes of hyper-IgM immunodeficiency syndrome exist depending upon the location of genetic mutation.
The major immunoglobulin isotype class in normal human serum. There are several isotype subclasses of IgG, for example, IgG1, IgG2A, and IgG2B.
The urea concentration of the blood stated in terms of nitrogen content. Serum (plasma) urea nitrogen is approximately 12% higher than blood urea nitrogen concentration because of the greater protein content of red blood cells. Increases in blood or serum urea nitrogen are referred to as azotemia and may have prerenal, renal, or postrenal causes. (From Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984)
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