Methods for decreasing interstitial immunoglobulin in tissue slices and cryostat sections.

Area of Science:

• Immunology
• Histology
• Biotechnology

Background:

• Long-distance transport of biological samples can compromise antigen integrity.
• Interstitial immunoglobulin (Ig) can interfere with accurate immunostaining in lymphoid tissues.

Purpose of the Study:

• To assess the preservation of lymphoid antigens and cellular morphology after transport.
• To develop methods for reducing interstitial Ig in cryostat sections for improved immunostaining.

Main Methods:

• Human tonsil samples were stored in buffer or medium at different temperatures (4°C, 20°C) for up to 72 hours.
• Cryostat sections were subjected to various washing protocols at different temperatures and durations.
• Immunostaining was performed to evaluate antigen preservation and interstitial Ig levels.

Main Results:

• B-cell, T-cell, and Ia antigens were well-preserved after storage up to 72 hours at 4°C.
• Interstitial Ig decreased after incubation, but a washing method was developed to significantly diminish it without affecting immunostaining quality.
• The developed method preserves cellular detail and is beneficial for detecting monotypic Ig patterns.

Conclusions:

• Lymphoid antigens and cellular morphology remain intact after extended transport and storage under specific conditions.
• A novel washing technique effectively reduces interstitial Ig in cryostat sections, enhancing the reliability of immunostaining for lymphoid tissue analysis.