Cytokine that stimulates the proliferation of hematopoietic stem cells and megakaryocyte progenitor cells and induces megakaryocyte maturation resulting in increased platelet production (PubMed:< a href="http://www.uniprot.org/citations/2145578" target="_blank">2145578). Also promotes the proliferation of hepatocytes in response to liver damage. Binding to its receptor formed by IL6ST and either IL11RA1 or IL11RA2 activates a signaling cascade that promotes cell proliferation (PubMed:< a href="http://www.uniprot.org/citations/12919066" target="_blank">12919066). Signaling leads to the activation of intracellular protein kinases and the phosphorylation of STAT3.