Thrombopoietin Enhances Rapid Current Responses Mediated by P2X 1 Receptors on Megakaryocytic Cells in Culture

Kazuyoshi Kawa

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8 Citations (Scopus)


The effect of thrombopoietin (TPO), a magakaryocytopoietic cytokine, on the functional maturation of megakaryocytes was studied by using cell culture and patch-clamp techniques focusing on purinergic 2X1 (P2X 1)-receptors, which are expressed specifically on platelets and their progenitors. Meg-01 cells, one of the typical human megakaryocytic cell lines, were cultured and studied by using a whole-cell patch electrode. In control cells cultured in RPMI1640 medium, an application of adenosine nucleotide (ADP, 40 μM) evoked transient inward currents with amplitudes of 45±19 pA (at -43 mV). Based on kinetic, ionic, and pharmacological properties as well as on previously reported findings, these currents were thought to be mediated by P2X1 receptors. When Meg-01 cells were cultured for 7-9 d in a medium to which the differentiation-inducing agent phorbol ester (PMA; 10 nM) or TPO (100 ng/ml) had been added, the responses of the cells to ADP increased to about 150% of the control with PMA and to about 200% of the control value with TPO. A combination of the two agents enhanced the response of the cells to ADP to about 570% of the control value. These results suggest that phorbol ester and TPO cause cellular differentiation of Meg-01 cells and enhance the level of expression of P2X1-receptors on cell membranes in a synergetic manner. The effect of TPO on the induction of P2X1-receptors on mouse megakaryocytes in culture was more obvious.

Original languageEnglish
Pages (from-to)287-299
Number of pages13
JournalJapanese Journal of Physiology
Issue number4
Publication statusPublished - 2003 Aug


  • Cell culture
  • Megakaryocyte
  • P2X receptors
  • Patch clamp
  • Thrombopoietin

ASJC Scopus subject areas

  • Physiology


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