Transient microscopy for measuring heat transfer in single cells

TL;DR

This paper introduces a transient microscopy method capable of mapping heat transfer coefficients within single cells at high spatial and temporal resolution, revealing nonuniform heat transfer properties and adaptive regulation.

Contribution

The study presents a novel transient microscopy technique for measuring heat transfer in single cells with unprecedented resolution and detail.

Findings

Inner cell regions show nonuniform heat transfer properties.

Cells exhibit self-regulated heat transfer responses to environmental temperature.

First measurement of heat transfer coefficients within individual cellular locations.

Abstract

Heat transfer and dissipation exists in almost any physical, chemical or biological systems. Cells, as the basic unit of life, undergo continuous heat transfer and dissipation during their metabolism. The heat transfer and dissipation within cells related to not only fundamental cellular functions and biochemical reactions, but also several important applications including heat-induced control of biological processes and treatment of diseases. Unfortunately, thus far, we still know very little about the heat transfer and dissipation properties at cellular or subcellular level. Here, we demonstrated a methodology of transient microscopy to map the heat transfer coefficients in single cells, with a temporal resolution of ~5 us and a spatial resolution of ~250 nm (close to diffraction limit). The heat transfer coefficients of different location within single cells were obtained for the first time, the inner part of cells exhibited nonuniform heat transfer properties, and it suggested a self-consistent heat transfer regulation that responds to environmental temperature.