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Human thrombopoietin levels are high when thrombocytopenia is due to
megakaryocyte deficiency and low when due to increased platelet destruction
RV Emmons, DM Reid, RL Cohen, G Meng, NS Young, CE Dunbar and NR Shulman
Hematology Branch, NHLBI, NIH, Bethesda, MD 20892, USA.
Thrombopoietin (TPO), the ligand for c-mpl, stimulates proliferation of
committed megakaryocytic progenitors and induces maturation of
megakaryocytes. To better understand factors regulating TPO levels, we
measured blood levels of TPO in patients with impaired platelet production
due to aplastic anemia (AA) and with platelet destructive disorders,
including idiopathic thrombocytopenic purpura (ITP), posttransfusion
purpura (PTP), drug purpura (DP), and X-linked thrombocytopenia (XLTP). The
TPO receptor capture enzyme immunoassay (EIA) used had a detection limit of
integral of approximately-150 to 200 pg/mL. TPO was undetectable in 88 of
89 normal individuals. Eighteen of 19 patients with AA and a mean platelet
count (MPC) of 18,000/microliters (2,000 to 61,000/microliters) had
markedly elevated TPO levels (mean, 1,467 pg/mL; range, 597 to 3,834
pg/mL). Eight AA patients who responded to immunosuppressive therapy with
their MPC increasing to 140,000/microliters (92,000 to 175,000/microliters)
had substantial decreases in TPO (mean, 440 pg/mL; range, 193 to 771
pg/mL). Initial TPO levels did not differ significantly between responders
and nonresponders. In contrast, all 21 patients with ITP and an MPC of
16,000/microliters (1,000 to 51,000 /microliters) had undetectable TPO
levels, as did 6 patients with acute PTP or DP and 2 patients with XLTP.
Megakaryocyte mass, reflected in the rate of platelet production, appears
to be the major determinant of TPO levels in thrombocytopenic patients
rather than circulating platelet levels per se. Measurement of serum TPO
may be useful in differentiating thrombocytopenias due to peripheral
destruction from those due to thrombopoietic failure.
Volume 87,
Issue 10,
pp. 4068-4071,
05/15/1996
Copyright © 1996 by The American Society of Hematology

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