An Optimized and Versatile Counter-Flow Centrifugal Elutriation Workflow to Obtain Synchronized Eukaryotic Cells

Area of Science:

• Cell Biology
• Molecular Biology
• Biotechnology

Background:

• Cell synchronization is crucial for studying cell cycle regulation.
• Counter-flow centrifugal elutriation (CCE) is a preferred method due to minimal impact on cell behavior.
• Optimizing CCE parameters is challenging and cell type-dependent.

Purpose of the Study:

• To optimize the counter-flow centrifugal elutriation (CCE) workflow for cell synchronization.
• To establish robust conditions for synchronizing the eukaryotic model organism, Tetrahymena thermophila.
• To provide a protocol adaptable for synchronizing diverse eukaryotic cell types.

Main Methods:

• Optimized flow cytometry conditions to reduce nuclear adhesion and improve cell cycle staging.
• Systematically analyzed critical CCE parameters: loading flow rate, collection flow rate, and collection volume.
• Validated cell cycle synchrony using 5-ethynyl-2'-deoxyuridine (EdU) incorporation, DNA content analysis, and light microscopy.

Main Results:

• Identified optimal flow cytometry settings for accurate cell cycle assessment.
• Determined ideal CCE flow rates and collection volumes for efficient cell separation.
• Achieved a highly synchronous population of G1-phase Tetrahymena cells.

Conclusions:

• The optimized CCE workflow effectively synchronizes Tetrahymena thermophila at the G1 phase.
• This protocol enhances the study of cell cycle events and regulatory mechanisms.
• The method is adaptable for synchronizing other eukaryotic cell types.