PTP-MEG2 is activated in polycythemia vera erythroid progenitor cells and is required for growth and expansion of erythroid cells

Mingjiang Xu, Xingwel Sui, Runxiang Zhao, Chunhua Dai, Sanford B. Krantz, Zhizhuang Joe Zhao

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40 Scopus citations


Polycythemia vera (PV) is a human clonal hematologic disorder. Previously we demonstrated that erythroid colony-forming cells (ECFCs) from PV patients contained a hyperactive membrane-associated tyrosine phosphatase. We now show that this phosphatase corresponded to protein tyrosine phosphatase (PTP)-MEG2, an intracellular enzyme with a putative lipid-binding domain. The increased activity of PTP-MEG2 in PV cells is due to its elevated distribution in the membrane fraction. With the development of ECFCs to mature red cells, the protein level of PTP-MEG2 decreased gradually, but membrane-associated PTP-MEG2 was sustained for a longer period of time in PV cells, which correlated with an enhanced colony-forming capability of the cells. Importantly, expression of dominant-negative mutant forms of PTP-MEG2 suppressed in vitro growth and expansion of both normal and PV ECFCs. The data indicate that PTP-MEG2 has an important role in the development of erythroid cells.

Original languageEnglish (US)
Pages (from-to)4354-4360
Number of pages7
Issue number13
StatePublished - Dec 15 2003
Externally publishedYes


ASJC Scopus subject areas

  • Hematology

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