Introduction of impermeable actin-staining molecules to mammalian cells by optoporation

TL;DR

This paper demonstrates a laser-based method to selectively introduce impermeable actin-staining molecules into specific mammalian cells, enabling targeted cellular studies with high spatial precision.

Contribution

The study introduces a femtosecond laser optoporation technique for precise delivery of impermeable molecules into individual mammalian cells, improving spatial selectivity over traditional methods.

Findings

Successful injection of rhodamine phalloidin into targeted cells

Observation of actin network staining post-injection

Potential for high-precision cellular manipulation

Abstract

The selective insertion of foreign materials, such as fluorescent markers or plasmids, into living cells has been a challenging problem in cell biology.However, it is often necessary that researchers insert such materials into cells for various dynamical and/or drug delivery studies. This problem becomes even more challenging if the study is to be limited to specific cells within a larger population, since other transfection methods, such as viral transfection and lipofection, are not realizable with a high degree of spatial selectivity.Here, we have used a focused femtosecond laser beam to create a small transient hole in the cellular membrane (optoporation) in order to inject nanomolar concentrations of rhodamine phalloidin (an impermeable dye molecule for staining filamentous actin) into targeted living mammalian cells (both HEK and primary cortical neurons).Following optoporation, the bound to the intracellular actin network and rise in fluorescence intensity was observed...