TPOR (MPL) Antibody – Rabbit Monoclonal

In 1990 an oncogene, v-mpl, was identified from the murine myeloproliferative leukemia virus that was capable of immortalizing bone marrow hematopoietic cells from different lineages. In 1992 the human homologue, named, c-mpl, was cloned. Sequence data revealed that c-mpl encoded a protein that was homologous with members of the hematopoietic receptor superfamily. Presence of anti-sense oligodeoxynucleotides of c-mpl inhibited megakaryocyte colony formation. The ligand for c-mpl, thrombopoietin, was cloned in 1994. Thrombopoietin was shown to be the major regulator of megakaryocytopoiesis and platelet formation. The protein encoded by the c-mpl gene, CD110, is a 635 amino acid transmembrane domain, with two extracellular cytokine receptor domains and two intracellular cytokine receptor box motifs . TPO-R deficient mice were severely thrombocytopenic, emphasizing the important role of CD110 and thrombopoietin in megakaryocyte and platelet formation. Upon binding of thrombopoietin CD110 is dimerized and the JAK family of non-receptor tyrosine kinases, as well as the STAT family, the MAPK family, the adaptor protein Shc and the receptors themselves become tyrosine phosphorylated. [provided by RefSeq, Jul 2008]

MPL: a hematopoietic receptor for thrombopoietin. Thrombopoietin is the major regulator of megakaryocytopoiesis and platelet formation. Dimerizes upon binding of thrombopoietin, leading to its phosphorylation and activation of JAKs and STATs. May represent a regulatory molecule specific for TPO-R-dependent immune responses. Two splice-variant isoforms have been described.

Protein type: Membrane protein, integral; Receptor, cytokine

Chromosomal Location of Human Ortholog: 1p34.2

Cellular Component: cell surface; Golgi apparatus; integral component of plasma membrane; plasma membrane

Molecular Function: protein binding; thrombopoietin receptor activity; transmembrane receptor activity

Biological Process: cell proliferation; cell surface receptor signaling pathway; thrombopoietin-mediated signaling pathway

Disease: Amegakaryocytic Thrombocytopenia, Congenital; Myelofibrosis; Thrombocythemia 2