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Immature megakaryocytes undergo apoptosis in the absence of thrombopoietin
M Osada1, T Komeno, K Todokoro
1Division of Hematology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
Abstract:
We examined withdrawal effects of recombinant mouse Tpo (rm-Tpo) on the apoptosis of mature and immature megakaryocytes in in vitro experiments. Apoptotic megakaryocytes were detected by double staining for acetylcholinesterase and by the TdT-mediated dUTP-biotin nick end labeling (TUNEL) method. When the purified mature megakaryocytes were cultured with or without rm-Tpo, the numbers of viable megakaryocytes, apoptotic megakaryocytes, and megakaryocytes with cytoplasmic processes were not significantly different between the two groups. In contrast, purified immature megakaryocytes underwent apoptosis when rm-Tpo was absent from the culture system. Murine bone marrow cells were cultured with rm-Tpo (50 U/mL) on days 1-7 to generate immature megakaryocytes and subsequently were cultured with different concentrations of rm-Tpo (0-50 U/mL) on days 8-14. The number of viable megakaryocytes was decreased and that of apoptotic megakaryocytes was increased by rm-Tpo in a dose-dependent manner. These results indicated a clear relation between the rm-Tpo level and the apoptosis of immature megakaryocytes.
Insights
Recombinant mouse thrombopoietin (rm-Tpo) withdrawal induced apoptosis in immature megakaryocytes but not mature ones. rm-Tpo levels directly influenced immature megakaryocyte apoptosis in a dose-dependent manner.
Area of Science:
- Hematology
- Cell Biology
Background:
- Thrombopoietin (Tpo) is crucial for megakaryopoiesis, regulating platelet production.
- The role of Tpo withdrawal on megakaryocyte apoptosis requires further elucidation.
Purpose of the Study:
- To investigate the effects of recombinant mouse Tpo (rm-Tpo) withdrawal on megakaryocyte apoptosis.
- To determine the relationship between rm-Tpo levels and megakaryocyte apoptosis.
Main Methods:
- In vitro experiments using purified mature and immature megakaryocytes.
- Apoptosis detection via acetylcholinesterase staining and TUNEL assay.
- Murine bone marrow cell cultures with varying rm-Tpo concentrations and durations.
Main Results:
- Mature megakaryocytes showed no significant difference in viability or apoptosis upon rm-Tpo withdrawal.
- Immature megakaryocytes underwent apoptosis when rm-Tpo was absent.
- Elevated rm-Tpo levels increased immature megakaryocyte apoptosis in a dose-dependent manner.
Conclusions:
- rm-Tpo withdrawal specifically induces apoptosis in immature megakaryocytes.
- Immature megakaryocyte apoptosis is directly correlated with rm-Tpo concentration.