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Drosophila miR-33-5p Suppresses Cell Growth by Inhibiting ERK Signaling
Taeheon Lee1, Nayeon Kim2, Ye Jin Park2
1College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
Abstract:
Cell growth control is a critical process underlying diverse biological events, including survival, development, tissue repair, and disease. Growth regulation is orchestrated by a combination of external and internal cues, involving a multitude of signaling pathways. Nevertheless, our comprehension of the regulation of growth-associated signaling pathways is still incomplete. In this study, we discovered that microRNA miR-33 overexpression in Drosophila S2 cells resulted in a reduction in cell proliferation. This growth inhibition was attributed to the inactivation of ERK signaling, which is mediated through Ras64B, a direct target of miR-33-5p. In accordance with these observations in S2 cells, miR-33 inactivation in Drosophila wings led to an increase in cell number, while its overexpression resulted in a decrease. Notably, miR-33-induced wing reduction was associated with diminished ERK signaling, and this wing defect was rescued by co-expression of Ras64B or a constitutively active ERK variant. Consequently, these findings establish miR-33-Ras64B-ERK as a regulatory axis, providing new mechanistic insights into growth control in Drosophila.
Insights
MicroRNA miR-33 inhibits cell proliferation by inactivating ERK signaling through Ras64B. This discovery reveals a new regulatory axis controlling cell growth in Drosophila, impacting development and disease.
Area of Science:
- Cell biology
- Molecular genetics
- Developmental biology
Background:
- Cell growth control is vital for biological processes like development and disease.
- Signaling pathways regulate growth, but their mechanisms are not fully understood.
- MicroRNAs (miRNAs) are key regulators of gene expression and cellular processes.
Purpose of the Study:
- To investigate the role of microRNA miR-33 in regulating cell growth.
- To elucidate the molecular mechanisms underlying miR-33's effect on cell proliferation.
- To identify the specific signaling pathways and targets involved in miR-33-mediated growth control.
Main Methods:
- Overexpression and inactivation of miR-33 in Drosophila S2 cells and wings.
- Analysis of cell proliferation rates and ERK signaling pathway activity.
- Identification of Ras64B as a direct target of miR-33-5p.
- Rescue experiments using Ras64B or constitutively active ERK variants.
Main Results:
- miR-33 overexpression reduced cell proliferation in Drosophila S2 cells.
- This inhibition was linked to ERK signaling inactivation via Ras64B.
- miR-33 inactivation increased cell number in Drosophila wings; overexpression decreased it.
- Wing defects caused by miR-33 were rescued by Ras64B or active ERK.
Conclusions:
- Established miR-33-Ras64B-ERK as a novel regulatory axis for growth control.
- Provided new mechanistic insights into how miRNAs regulate cell proliferation.
- Highlighted the conserved role of this pathway in Drosophila development.
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