Thrombocytopenia associated with liver cirrhosis and hepatitis C viral infection: Role of thrombopoietin

Background/Aims: Thrombocytopenia in chronic liver diseases has traditional ly been considered a consequence of platelet pooling and destruction in spl een. We tried to evaluate the influence of thrombo-poietin, the physiologic al regulator of thrombopoiesis, on the origin of this thrombocytopenia. Methodology: We determined serum thrombopoietin levels by ELISA in thromboc ytopenic patients with liver cirrhosis (n = 32) and with chronic hepatitis C viral infection (n = 23). A group of 43 healthy subjects was used as a co ntrol. Results: Liver cirrhosis patients presented slightly, but not significantly , lower serum thrombopoietin levels (104 +/- 56pg/mL) than controls (121 +/ - 58 pg/mL) or patients infected with chronic hepatitis C virus (125 +/- 40 pg/mL). No correlations were found between serum thrombopoietin concentrat ions and liver tests or hematological parameters. Conclusions: We conclude that low thrombopoietin production may play a role , along with hypersplenism, in the development of thrombocytopenia in patie nts with Liver cirrhosis. Normal thrombopoietin levels exclude a defect in thrombopoietin production as a possible etiology for the thrombocytopenia i n patients with chronic hepatitis C viral infection. However, a direct vira l megakaryocyte infection or an immune mechanism could explain this thrombo cytopenia, according to the thrombopoietin levels detected.