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Related Experiment Videos

Exacerbation reactions in hyperactive lepromatous leprosy.

D S Ridley, M J Ridley

    International Journal of Leprosy and Other Mycobacterial Diseases : Official Organ of the International Leprosy Association
    |September 1, 1984
    PubMed
    Summary

    Exacerbation reactions in leprosy are characterized by intense bacterial loads and unique histological features. These reactions involve specific immune responses, differing from erythema nodosum leprosum.

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    Area of Science:

    • Immunology
    • Dermatology
    • Pathology

    Background:

    • Exacerbation reactions (ER) occur in histoid leprosy lesions with high bacterial loads.
    • Clinically, ER can be silent, leading to ulceration and bacillary release.
    • Histological features of ER can mimic erythema nodosum leprosum (ENL).

    Purpose of the Study:

    • To investigate the histopathological and immunocytological characteristics of exacerbation reactions.
    • To compare ER with nonreacting hyperactive lesions and ENL.
    • To elucidate the underlying mechanisms of histoid lesion hyperactivity.

    Main Methods:

    • Histopathological examination of 13 exacerbation reactions.
    • Immunocytological analysis of lesions.
    • Comparison with nonreacting hyperactive lesions and ENL cases.

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    Main Results:

    • ER show polymorph neutrophil influx and macrophage degeneration, mimicking ENL.
    • Distinctive features include increased vascular permeability, small blood vessel necrosis, and mast cell degranulation.
    • Predominant immunoglobulin is IgE; C1q is present, but C3 is largely undetectable.
    • Immune complexes may form in antigen excess, with potential contribution from hydrolases and proteases released by activated immune cells.

    Conclusions:

    • Histoid lesions are characterized by hyperactivity.
    • ER represent a distinct reactional pattern in leprosy, with unique immunological and pathological features.
    • Understanding ER mechanisms is crucial for managing leprosy complications.