Thrombopoietin (TPO)
Overview
Thrombopoietin is a 332-amino acid endogenous glycoprotein hormone and the primary physiologic regulator of megakaryopoiesis and platelet production. It binds to the c-Mpl receptor on megakaryocyte progenitors and mature megakaryocytes, stimulating their proliferation, differentiation, and platelet release.
Mechanism of Action
Recombinant TPO and pegylated recombinant megakaryocyte growth and development factor (PEG-rHuMGDF) were developed but abandoned after clinical trials revealed antibody-mediated thrombocytopenia.
Research Summary & Key Findings
Early clinical trials of recombinant TPO in the 1990s showed efficacy in chemotherapy-induced thrombocytopenia, but development was halted after healthy volunteers and cancer patients developed neutralizing antibodies that cross-reacted with endogenous TPO, causing severe thrombocytopenia. This experience led to development of non-immunogenic TPO receptor agonists such as romiplostim and eltrombopag that do not share sequence homology with native TPO.
Clinical Status
Thrombopoietin (TPO) is in the investigational stage. While preclinical and early-phase data exist, it has not received regulatory approval for clinical use in the United States.
Administration Routes
References
Primary literature
- PubMed — "Thrombopoietin"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov — "Thrombopoietin"
Registered interventional and observational studies, including status and phase.
- PubChem — "Thrombopoietin"
Chemical structure, molecular properties, and bioactivity data.
Study-level citations for this compound are being verified against the primary sources before publication. The database queries above return the current indexed literature in the meantime.
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