In Vitro Assays for Measuring Intercellular Coupling Among Peripheral Circadian Oscillators

Area of Science:

• Chronobiology
• Cell Biology
• Tissue Engineering

Background:

• Circadian clocks are fundamental biological oscillators present in most organisms.
• Intercellular communication between circadian oscillators is key to tissue-level rhythmic functions.
• Understanding peripheral clock coupling is essential for deciphering organ physiology.

Purpose of the Study:

• To develop and present a protocol for studying intercellular coupling among peripheral circadian oscillators.
• To quantify the strength of coupling within peripheral clock networks.
• To model tissue complexity and cell-cell interactions using 3D spheroid cultures.

Main Methods:

• Utilizing three-dimensional (3D) spheroid cultures to mimic in vivo tissue integrity.
• Employing spheroids with engineered circadian reporters for live-cell imaging.
• Monitoring circadian rhythms over several days within these 3D cultures.

Main Results:

• The protocol enables the study of intercellular coupling in a more complex, tissue-like environment.
• 3D spheroids provide increased cell-cell interaction complexity and potential coupling factors.
• Live-cell imaging allows for dynamic monitoring of circadian reporter activity in coupled oscillators.

Conclusions:

• This 3D spheroid-based protocol offers a novel approach to investigate peripheral circadian clock coupling.
• The method enhances the study of how cellular circadian networks contribute to rhythmic organ function.
• The findings provide a foundation for future research into tissue-level chronobiology.