Protocol for in vitro immunofluorescence staining in a Transwell co-culture system

Area of Science:

• Cell Biology
• Biochemistry
• Immunology

Background:

• Immunofluorescence (IF) is crucial for visualizing molecular targets within cells.
• Skeletal muscle myotube formation is a key model for studying muscle development and disease.
• Culturing cells on Transwell inserts facilitates co-culture and mechanistic studies.

Purpose of the Study:

• To present a refined protocol for in vitro immunofluorescence staining.
• To optimize IF for skeletal muscle myotubes cultured on Transwell inserts.
• To enable direct IF analysis in Transwell-based co-culture systems.

Main Methods:

• Protocol development for primary skeletal muscle cell culture.
• Optimization of fixation, permeabilization, and antibody incubation steps.
• IF microscopy for quantifying myotube differentiation and calculating the fusion index.

Main Results:

• Successful implementation of an in vitro IF staining protocol for skeletal muscle myotubes.
• Demonstration of direct IF staining on cell monolayers on permeable supports.
• Quantification of myotube fusion index using IF microscopy.

Conclusions:

• The developed protocol provides a reliable method for direct IF staining in Transwell systems.
• This technique is valuable for studying skeletal muscle myogenesis in co-culture models.
• The protocol enhances the ability to analyze molecular localization and differentiation in complex cell culture setups.