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Immunofluorescence abnormalities in lichen planopilaris.

D Ioannides¹, J C Bystryn

¹Department of Dermatology, New York University School of Medicine, NY 10016.

Archives of Dermatology

|February 1, 1992

Summary

Immunofluorescence studies reveal distinct immunoreactant deposits in lichen planopilaris compared to lichen planus. These differences suggest lichen planopilaris is a separate condition, not just a variant of lichen planus.

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Area of Science:

Dermatology
Immunopathology

Background:

Lichen planopilaris (LPP) and lichen planus (LP) share histological similarities.
Clinical presentations of LPP and LP differ significantly.

Purpose of the Study:

To investigate the relationship between LPP and LP using immunofluorescence.
To differentiate LPP from LP based on immunopathological markers.

Main Methods:

Direct immunofluorescence on scalp lesions from seven LPP patients.
Analysis of immunoglobulin (Ig) and fibrin deposits in the basement membrane zone (BMZ).

Main Results:

Abnormal linear Ig deposits observed in the BMZ of hair follicles in all LPP patients.
Ig deposits in LPP were primarily IgG or IgA, differing from LP's common fibrin BMZ deposits.

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Absence of Ig staining over ovoid bodies in LPP, contrasting with LP.

Conclusions:

Immunofluorescence findings in LPP are distinct from those in LP.
The differing immunoreactant deposition patterns support LPP and LP as separate diseases.