Novel microscopy-based screening method reveals regulators of contact-dependent intercellular transfer.

Area of Science:

• Cell Biology
• Molecular Mechanisms
• Microscopy Techniques

Background:

• Contact-dependent intercellular transfer (codeIT) facilitates the exchange of cellular constituents between adjacent cells.
• This process has implications for cell survival, drug resistance, and the spread of pathogens.
• The molecular mechanisms governing codeIT remain largely uncharacterized.

Purpose of the Study:

• To develop a novel microscopy-based screening method for identifying regulators and cargo of codeIT.
• To elucidate the molecular machinery involved in contact-dependent intercellular transfer.
• To enable large-scale genetic and chemical screening for codeIT regulators.

Main Methods:

• Development of a 3D confocal microscopy and image analysis pipeline to quantify codeIT.
• Co-culture of single donor cells with fluorescently labeled cargo and excess acceptor cells.
• siRNA-based screening to identify genetic regulators of codeIT.

Main Results:

• Identification of myosins and small GTPases as significant regulators of codeIT.
• Demonstration of the involvement of cellular protrusions and tubular recycling endosomes in codeIT.
• Successful automation of image acquisition and analysis for high-throughput screening.

Conclusions:

• The developed microscopy screen provides a powerful tool for dissecting codeIT mechanisms.
• Myosins and small GTPases play crucial roles in regulating the transfer of cellular material between cells.
• Cellular protrusions and recycling endosomes are critical structural components for efficient codeIT.