Histogel-based techniques for embedding organoids in paraffin blocks enable high throughput downstream...

Area of Science:

• Biotechnology
• 3D Tissue Models
• Histology

Background:

• Organoids are advanced in vitro tissue models for studying 3D biology, toxicity, and drug efficacy.
• Current analysis methods like whole mount immunolabeling consume entire samples, limiting downstream applications.
• Fixation of 3D organoid cultures can lead to friability and sample loss during processing.

Purpose of the Study:

• To develop and present methods for processing 3D organoid cultures into paraffin blocks.
• To enable robust characterization of organoids through multiple assays from a single sample.
• To maximize the yield and utility of time- and labor-intensive organoid cultures.

Main Methods:

• Three distinct methods for processing 3D Matrigel organoid cultures into paraffin blocks were developed.
• Histogel was utilized as the embedding agent in all described techniques.
• Methods were evaluated for quality of sections and ease of implementation.

Main Results:

• All three methods successfully produced high-quality histological sections from 3D organoid cultures.
• Processing organoids into paraffin blocks allows for generation of numerous slides from a single culture.
• The techniques offer varying levels of complexity suitable for different research needs.

Conclusions:

• Embedding organoids in paraffin blocks significantly enhances sample preservation and accessibility for diverse analyses.
• These methods provide a valuable alternative to whole mount analysis, reducing sample loss and increasing assay flexibility.
• The described techniques are crucial for maximizing the potential of organoid models in biomedical research.