Negative regulation of Stat3 by activating PTPN11 mutants contributes to the pathogenesis of Noonan syndrome and juvenile myelomonocytic leukemia

Wenjun Zhang, Rebecca J. Chan, Hanying Chen, Zhenyun Yang, Yantao He, Xian Zhang, Yong Luo, Fuqing Yin, Akira Moh, Lucy C. Miller, R. Mark Payne, Zhong Yin Zhang, Xin Yuan Fu, Weinian Shou

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39 Scopus citations


Noonan syndrome (NS) is an autosomal dominant congenital disorder characterized by multiple birth defects including heart defects and myeloproliferative disease (MPD). Approximately 50% of NS patients have germline gain-of-function mutations in PTPN11, which encodes the protein-tyrosine phosphatase, Shp2. We provide evidence that conditional ablation of Stat3 in hematopoietic cells and cardiac valvular tissues leads to myeloid progenitor hyperplasia and pulmonary stenosis due to the leaflet thickening, respectively. Consistently, STAT3 activation is significantly compromised in peripheral blood cells from NS patients bearing Shp2-activating mutations. Biochemical and functional analyses demonstrate that activated Shp2 is able to down-regulate Tyr(P)-Stat3 and that constitutively active Stat3 rescues activating mutant Shp2-induced granulocyte-macrophage colony-stimulating factor hypersensitivity in bone marrow cells. Collectively, our work demonstrates that Stat3 is an essential signaling component potentially contributing to the pathogenesis of NS and juvenile myelomonocytic leukemia caused by PTPN11 gain-of-function mutations.

Original languageEnglish (US)
Pages (from-to)22353-22363
Number of pages11
JournalJournal of Biological Chemistry
Issue number33
StatePublished - Aug 14 2009


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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