Alternative Brain Slice-on-a-Chip for Organotypic Culture and Effective Fluorescence Injection Testing

Area of Science:

• Neuroscience
• Bioengineering
• Microfluidics

Background:

• Mouse brain slices are crucial models for studying brain development and function.
• Microfluidic systems are increasingly integrated for advanced hippocampal slice cultures.
• Current methods require improvements for precise reagent administration in brain slice models.

Purpose of the Study:

• To present an alternative brain slice-on-a-chip with an integrated injection system.
• To enable long-term monitoring of hippocampal slices using fluorescent dye.
• To demonstrate effective and contamination-free reagent administration within microfluidic bioreactors.

Main Methods:

• Development of a microfluidic chip with an internal injection system.
• Culture of organotypic hippocampal slices within the developed chip.
• Dispensing of fluorescent dye via the integrated injection system for monitoring.
• Observation of fluorescence signals and maintenance of slice cytoarchitecture.

Main Results:

• Successful long-term monitoring of hippocampal slices using in-situ fluorescent dye injection.
• Demonstration of intact slice cytoarchitecture post-staining.
• Validation of the injection method's effectiveness in preventing leaks and contamination.
• Observation of fluorescence signals from living cells within the chip.

Conclusions:

• The developed brain slice-on-a-chip with an integrated injection system offers a significant advancement.
• This technology facilitates precise local administration of reagents in microfluidic bioreactors.
• The system is a promising tool for organotypic cultures, enhancing brain slice research.