Platelet autoantibodies in patients with chronic liver disease

The thrombocytopenia in chronic liver disease (CLD) has been attributed mainly to hypersplenism, although other factors such as reduced mean life span with increased platelet turnover have also been demonstrated. Immunological abnormalities have been described in the pathogenesis and progression of CLD. In this sense, many studies have reported elevated levels of platelet associated IgG (PAIgG) in patients with CLD, and it has been suggested that PAIgG could represent true antiplatelet antibody. In this study we used a glycoprotein (GP)‐specific immunoassay (MACE) to determine whether PAIgG or circulating antiplatelet antibodies, reacted against the GPIIb/IIIa or GPIb/IX complexes, in patients with CLD. Thirty‐six patients with CLD of diverse etiology were studied (20 female, mean age 53 years, range 38–75 years). 23 out of 36 patients (64%) had anti‐GP antibodies in MACE. Particularly, 12 had anti‐GPIb, 4 anti‐GPIIb/IIIa, and 7 had both types of autoantibodies. The existence of these anti‐GP antibodies was not related with the blood platelet count or etiology of CLD.

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