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Serum-dependent perinuclear accumulation of Cdc42 in mammalian cells
R Begum1, M A Zaman, M S Nur-E-Kamal
1Department of Botany, University of Dhaka, Dhaka 1000, Bangladesh.
Abstract:
Cdc42 is a member of the Rho family of GTPase. Cdc42 has been implicated to be involved in the movement, multiplication and transformation of mammalian cells by controlling the rearrangement of actin cytoskeleton and gene expression. But the mechanism of Cdc42 function has not yet been discovered. In this report we present data showing a perinuclear accumulation of Cdc42 in response to fetal bovine serum (FBS). There was no change in the amount of Cdc42 in response to FBS in the cell. It was found that protein component(s) of serum plays a major role in the perinuclear accumulation of Cdc42. Epidermal growth factor has also been found to stimulate the perinuclear accumulation of Cdc42 while NGF has no effect. Kinase inhibitors, quercetin and NDGA were found to block signals for the perinuclear accumulation of Cdc42. This suggests that phosphorylation of cellular proteins is essential for transducing signals generated from the serum component(s) to induce the perinuclear accumulation of Cdc42. These results indicate that redistribution of Cdc42 might be an important step in alteration of gene expression for controlling various functions of the cell including cell division.
Insights
Fetal bovine serum (FBS) induces perinuclear accumulation of Cdc42, a Rho GTPase, without altering its total cellular amount. This redistribution, dependent on serum proteins and phosphorylation, may regulate gene expression and cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Cdc42, a Rho family GTPase, regulates mammalian cell functions like movement, multiplication, and transformation.
- Its precise mechanism of action, particularly in controlling actin cytoskeleton and gene expression, remains incompletely understood.
Purpose of the Study:
- To investigate the mechanism of Cdc42 function, specifically its cellular localization in response to stimuli.
- To elucidate the signaling pathways involved in Cdc42 redistribution.
Main Methods:
- Observation of Cdc42 localization in mammalian cells treated with fetal bovine serum (FBS).
- Analysis of Cdc42 protein levels.
- Investigation of the role of serum protein components, epidermal growth factor (EGF), and nerve growth factor (NGF).
- Assessment of kinase inhibitors (quercetin, NDGA) on Cdc42 accumulation.
Main Results:
- FBS stimulation led to a significant perinuclear accumulation of Cdc42 without changing its total cellular amount.
- Protein components within FBS were identified as key drivers of this accumulation.
- Epidermal growth factor (EGF) also stimulated perinuclear Cdc42 accumulation, whereas NGF did not.
- Kinase inhibitors blocked the signaling pathway for Cdc42 perinuclear accumulation, suggesting a role for protein phosphorylation.
Conclusions:
- Serum-induced perinuclear redistribution of Cdc42 is a critical signaling event.
- Phosphorylation of cellular proteins is essential for transducing signals that mediate Cdc42 accumulation.
- Cdc42 redistribution may play a vital role in modulating gene expression for cellular functions, including cell division.