A microfluidic-enabled mechanical microcompressor for the immobilization of live single- and multi-cellular specimens

Area of Science:

• Biophysics
• Cell Biology
• Microscopy Technology

Background:

• Optical microscopy requires precise specimen preparation for visualizing sub-cellular details.
• Immobilization of delicate biological specimens, from bacteria to larger organisms, is crucial for long-term observation.
• Existing methods may lack the precision or versatility needed for diverse cellular and organismal studies.

Purpose of the Study:

• To develop and characterize an easily fabricated microcompressor for enhanced optical microscopy.
• To enable non-destructive, micrometer-precision immobilization of a wide range of biological specimens.
• To integrate microfluidics for dynamic media and chemical application during live imaging.

Main Methods:

• Fabrication of a versatile microcompressor device compatible with upright and inverted microscopes.
• Integration of microfluidic channels for controlled introduction of media or chemicals.
• Development of removable compressor mounts and customizable specimen beds for easy specimen handling.
• Application of the device for imaging various cellular events in protozoa, yeast, and Drosophila embryos.

Main Results:

• Demonstrated micrometer-precision flattening and non-destructive immobilization of specimens from bacteria to Caenorhabditis elegans.
• Successfully imaged numerous cellular events in protozoan species, yeast, and Drosophila melanogaster embryos.
• Documented previously unreported cellular events and performed photobleaching experiments on Tetrahymena thermophila.

Conclusions:

• The developed microcompressor is a versatile and easily fabricated tool for advanced optical microscopy.
• The device significantly enhances visualization of sub-cellular structures and dynamic cellular processes.
• Its microfluidic capabilities and specimen handling features support long-term, in-situ studies of diverse biological samples.