Romiplostim (Nplate)
Overview
A thrombopoietin (TPO) receptor agonist consisting of a peptide sequence that binds the TPO receptor (c-Mpl) fused to an IgG1 Fc domain (peptibody). Romiplostim activates JAK2/STAT5 signaling in megakaryocyte progenitors, promoting megakaryocyte proliferation, differentiation, and platelet production. It has no sequence homology to endogenous TPO, minimizing the risk of cross-reactive antibody formation.
Key Research Findings
FDA-approved in 2008 for chronic immune thrombocytopenia (ITP) in adults with insufficient response to corticosteroids, immunoglobulins, or splenectomy. Clinical trials showed durable platelet responses in 79-88% of patients with splenectomized and non-splenectomized ITP. Extended treatment studies demonstrated sustained platelet response for up to 5 years. Risk of bone marrow reticulin fiber deposition requires monitoring.
Subcutaneous injection (weekly)
FDA Approved
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