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Selective expression of mRNA coding for the truncated form of erythropoietin receptor in hematopoietic cells and its
S Chiba1, T Takahashi, K Takeshita
1Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Bunkyo-ku, Japan.
Blood
|July 1, 1997
Summary
Erythropoietin receptor (EPOR-T) mRNA is significantly reduced in polycythemia vera (PV) patients. This decrease, possibly due to a faulty splicing system in hematopoietic progenitors, contributes to PV's pathophysiology.
Area of Science:
- Hematology
- Molecular Biology
- Genetics
Background:
- The erythropoietin receptor (EPOR) gene produces full-length (EPOR-F) and truncated (EPOR-T) isoforms.
- EPOR-T, encoded by mRNA with unspliced intron VII, is thought to negatively regulate EPOR-F activity.
Purpose of the Study:
- To investigate the role of EPOR-T mRNA levels in polycythemia vera (PV).
- To explore the cellular mechanisms regulating EPOR-T mRNA expression and its potential link to PV.
Main Methods:
- Quantitative analysis of EPOR-T mRNA in blood cells from PV patients.
- Expression analysis of EPOR-T mRNA in various leukemia cell lines (erythroid/megakaryocytic and nonerythroid/nonmegakaryocytic).
Main Results:
- EPOR-T mRNA levels were markedly decreased in the blood cells of PV patients.
- EPOR-T mRNA was absent in erythroid/megakaryocytic leukemia cell lines but present in nonerythroid/nonmegakaryocytic lines.
- This suggests a cell type-specific splicing mechanism for EPOR transcripts involving intron VII.
Conclusions:
- A significant reduction in EPOR-T mRNA occurs in PV.
- Dysregulation of the intron VII splicing system in early hematopoietic progenitors may underlie the decreased EPOR-T mRNA levels and contribute to PV pathophysiology.