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Immunofluorescence Microscopy

Immunofluorescence Microscopy

A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.

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Technique of Conjunctival Biopsy and Direct Immunofluorescence for Diagnosing Mucous Membrane Pemphigoid

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Published on: June 17, 2025

Punctate pemphigus: an underreported direct immunofluorescence pattern.

Christine J Ko¹, Jennifer M McNiff

¹Dermatology and Pathology, Yale University, New Haven, CT, USA.

Journal of Cutaneous Pathology

|December 31, 2013

Summary

This summary is machine-generated.

Direct immunofluorescence studies of pemphigus show immunoglobulin G (IgG) deposition in the skin. A less recognized punctate pattern of IgG deposition occurs with equal frequency as the classic chicken wire pattern in pemphigus vulgaris and pemphigus foliaceus.

Keywords:

desmosome dot-like immunofluorescence pemphigus punctate

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Area of Science:

Dermatology
Immunopathology
Histopathology

Background:

Direct immunofluorescence (DIF) is crucial for diagnosing pemphigus.
The classic DIF finding is a continuous, net-like (chicken wire) intercellular deposition of immunoglobulin G (IgG).
A punctate or dot-like intercellular IgG deposition pattern in DIF is less commonly described.

Purpose of the Study:

To highlight the significance of the punctate intercellular IgG deposition pattern in DIF for pemphigus diagnosis.
To investigate the occurrence and frequency of both continuous and punctate IgG deposition patterns in pemphigus.
To review potential mechanisms behind the punctate IgG deposition pattern.

Main Methods:

Analysis of direct immunofluorescence (DIF) specimens from patients with pemphigus.
Categorization of intercellular immunoglobulin G (IgG) deposition patterns as continuous (chicken wire) or punctate (dot-like).
Comparison of the frequency of these patterns in pemphigus vulgaris and pemphigus foliaceus.

Main Results:

Intercellular immunoglobulin G (IgG) deposition in DIF can present as continuous, punctate, or combined patterns.
The punctate IgG deposition pattern was observed with equal frequency to the continuous pattern.
Both pemphigus vulgaris and pemphigus foliaceus exhibited these deposition patterns.

Conclusions:

The punctate intercellular IgG deposition pattern is a relevant finding in DIF studies of pemphigus.
This pattern occurs with similar frequency to the classic chicken wire pattern in both pemphigus vulgaris and pemphigus foliaceus.
Increased recognition of the punctate pattern may improve diagnostic sensitivity in pemphigus.