A new immunofluorostaining method using red fluorescence of PerCP on formalin-fixed paraffin-embedded tissues

Area of Science:

• Biomedical research
• Pathology
• Immunohistochemistry

Background:

• Immunofluorostaining offers clear contrast and precise signal quantification for biomedical research.
• Clinical application is limited by high fluorescent background in formalin-fixed, paraffin-embedded tissue sections.
• Conventional fluorescent dyes like fluorescein isothiocyanate (FITC) are obscured by tissue autofluorescence.

Purpose of the Study:

• To develop a novel immunofluorostaining method for clinical diagnosis.
• To overcome the challenge of high background fluorescence in paraffin-embedded tissue sections.
• To enable accurate detection and quantification of target immunofluorescence in human tumor samples.

Main Methods:

• Utilized peridinin chlorophyll a protein (PerCP), an albuminous dye, for immunostaining human tumor sections.
• Employed tumor-reactive monoclonal antibodies for specific target binding.
• Observed tissue morphology and autofluorescence for simultaneous counterstaining.

Main Results:

• Red fluorescence of PerCP effectively distinguished tumor regions against yellow-green tissue autofluorescence.
• Tissue morphology was observable without additional counterstaining, as autofluorescence served this purpose.
• Digital quantification of PerCP-stained image intensity showed excellent correlation (r2>0.99) with PerCP amount, validating quantification accuracy.

Conclusions:

• The developed immunofluorostaining method is simple and effective for pathological diagnosis.
• PerCP staining allows for clear visualization and accurate quantification in clinical settings.
• This technique has broad applicability for diagnosing various conditions, including cancer.