Protocol for assessing GD2 on formalin-fixed paraffin-embedded tissue sections using immunofluorescence staining

Area of Science:

• Oncology
• Immunohistochemistry
• Biomarker Detection

Background:

• Disialoganglioside GD2 detection on tumor biopsies, particularly in FFPE tissues, is difficult due to its glycolipid nature and membrane anchoring.
• Reliable GD2 assessment is crucial for certain cancer diagnostics and therapeutic strategies.

Purpose of the Study:

• To develop and present a robust immunofluorescence protocol for the reliable assessment of disialoganglioside GD2 in formalin-fixed paraffin-embedded (FFPE) tissues.
• To overcome the challenges associated with GD2 detection in FFPE samples.

Main Methods:

• The protocol involves antigen retrieval using Tris-EDTA buffer.
• Staining utilizes an unconjugated anti-GD2 antibody (clone 14.G2a) and a horse radish peroxidase (HRP)-conjugated secondary antibody.
• Tyramide signal amplification technique is employed for enhanced signal detection.

Main Results:

• The described immunofluorescence protocol enables reliable detection of disialoganglioside GD2 on FFPE tissues.
• The method addresses the inherent challenges of GD2 detection in fixed tissue samples.

Conclusions:

• This protocol provides a valuable tool for researchers and clinicians needing to assess GD2 expression in FFPE tumor biopsies.
• The optimized immunofluorescence method facilitates more accurate and consistent GD2 detection in challenging FFPE samples.