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Iron-responsive element-binding protein mRNA levels during erythroid differentiation of murine erythroleukemia cells
1Institute of Hematology and Blood Transfusion, Prague, Czech Republic.
Abstract:
The levels of iron-responsive element-binding protein (IRE-BP I) mRNA throughout the course of erythroid differentiation were investigated in several lines of murine erythroleukemia (MEL) cells (Friend 745, 707 and Fw cells). Fw cells are not inducible for ferrochelatase activity and heme synthesis. Cytoplasmic ferrochelatase mRNA and transferrin receptor (TfR) mRNA levels are only insignificantly increased in Fw cells after induction. We have found increased levels of (IRE-BP 1) mRNA during erythroid differentiation of MEL cells of all lines investigated. Run-on transcription reactions using isolated nuclei from Friend 707 cells showed increased (IRE-BP 1) gene transcription following induction of erythroid differentiation with 5 mmol hexamethylenebisacetamide (HMBA). The increase in (IRE-BP 1) gene transcription is only about 2-fold in comparison with 8-fold increase in the level of (IRE-BP 1) mRNA during 96 hours of Friend 707 cells induction. These findings indicate that the stability of (IRE-BP 1) mRNA might also play a role in the increase of (IRE-BP 1) mRNA levels after Friend 707 cells induction. The possible role of increased (IRE-BP) mRNA levels in the elevation of TfR numbers during erythroid differentiation is discussed.
Insights
Iron-responsive element-binding protein (IRE-BP I) mRNA levels increase during erythroid differentiation in murine erythroleukemia cells. This rise is partly due to increased gene transcription and potentially enhanced mRNA stability.
Area of Science:
- Molecular Biology
- Cell Biology
- Hematopoiesis
Background:
- Erythroid differentiation involves complex gene regulation.
- Iron metabolism is crucial for heme synthesis during red blood cell development.
- Iron-responsive element-binding protein (IRE-BP I) regulates iron homeostasis.
Purpose of the Study:
- To investigate the regulation of IRE-BP I mRNA during erythroid differentiation in murine erythroleukemia (MEL) cells.
- To determine the contribution of gene transcription and mRNA stability to IRE-BP I mRNA level changes.
Main Methods:
- Analysis of IRE-BP I mRNA levels in MEL cell lines (Friend 745, 707, Fw) during induced erythroid differentiation.
- Run-on transcription assays using isolated nuclei from Friend 707 cells.
- Induction of differentiation using hexamethylenebisacetamide (HMBA).
Main Results:
- IRE-BP I mRNA levels significantly increased during erythroid differentiation across all investigated MEL cell lines.
- A 2-fold increase in IRE-BP I gene transcription was observed after HMBA induction.
- An 8-fold increase in IRE-BP I mRNA levels suggests a significant role for mRNA stability.
Conclusions:
- Both increased gene transcription and enhanced mRNA stability contribute to elevated IRE-BP I mRNA levels during MEL cell erythroid differentiation.
- The findings suggest a potential role for increased IRE-BP mRNA in regulating transferrin receptor numbers during this process.