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Published on: September 9, 2014
Defective erythroid differentiation in miR-451 mutant mice mediated by 14-3-3zeta
David M Patrick1, Cheng C Zhang, Ye Tao
1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
Abstract:
Erythrocyte formation occurs throughout life in response to cytokine signaling. We show that microRNA-451 (miR-451) regulates erythropoiesis in vivo. Mice lacking miR-451 display a reduction in hematrocrit, an erythroid differentiation defect, and ineffective erythropoiesis in response to oxidative stress. 14-3-3zeta, an intracellular regulator of cytokine signaling that is repressed by miR-451, is up-regulated in miR-451(-/-) erythroblasts, and inhibition of 14-3-3zeta rescues their differentiation defect. These findings reveal an essential role of 14-3-3zeta as a mediator of the proerythroid differentiation actions of miR-451, and highlight the therapeutic potential of miR-451 inhibitors.
Insights
MicroRNA-451 (miR-451) is crucial for red blood cell formation (erythropoiesis). Its absence causes anemia and differentiation defects, highlighting miR-451
Area of Science:
- Hematology
- Molecular Biology
- Gene Regulation
Background:
- Erythrocyte formation (erythropoiesis) is a continuous process regulated by cytokine signaling.
- MicroRNAs (miRNAs) are key regulators of gene expression, impacting various biological processes.
- The specific role of miR-451 in erythropoiesis in vivo was not fully understood.
Purpose of the Study:
- To investigate the role of microRNA-451 (miR-451) in regulating erythropoiesis in vivo.
- To identify the molecular mechanisms by which miR-451 influences red blood cell development.
- To explore the potential therapeutic implications of targeting miR-451 in erythropoietic disorders.
Main Methods:
- Utilized a mouse model lacking miR-451 (miR-451(-/-)) to study erythropoiesis.
- Assessed hematocrit levels and erythroid differentiation in wild-type and miR-451(-/-) mice.
- Investigated the expression of 14-3-3zeta in erythroblasts and evaluated the effect of its inhibition.
Main Results:
- Mice lacking miR-451 exhibited reduced hematocrit and significant erythroid differentiation defects.
- Ineffective erythropoiesis was observed in miR-451(-/-) mice, particularly under oxidative stress conditions.
- Upregulation of 14-3-3zeta was detected in miR-451(-/-) erythroblasts, and its inhibition rescued the differentiation defect.
Conclusions:
- MicroRNA-451 plays an essential regulatory role in erythropoiesis in vivo.
- 14-3-3zeta acts as a key mediator of miR-451's proerythroid differentiation effects.
- Targeting miR-451 presents a potential therapeutic strategy for erythropoietic disorders.
