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Related Experiment Videos

Ultrastructural study across the leprosy spectrum

V V Ortega1, F Martínez Díaz, G Ortuño Pacheco

  • 1Department of Pathology, University of Murcia, Spain.

Ultrastructural Pathology
|July 1, 1994
PubMed
Summary
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Ultrastructural analysis reveals leprosy bacilli primarily reside within vacuoles in macrophages and host cells in lepromatous (LL) and borderline lepromatous (BL) leprosy. Borderline tuberculoid (BT) leprosy shows fewer bacilli, with many degraded forms observed.

Area of Science:

  • Microbiology
  • Immunology
  • Dermatology

Background:

  • Leprosy, a chronic infectious disease, presents diverse clinical forms.
  • Understanding the ultrastructural pathology is crucial for leprosy management.

Purpose of the Study:

  • To conduct a systematic ultrastructural examination of leprosy bacilli, host cell responses, and dermal microvasculature.
  • To differentiate ultrastructural features across lepromatous (LL), borderline lepromatous (BL), and borderline tuberculoid (BT) leprosy types.

Main Methods:

  • Systematic ultrastructural study of eight active leprosy cases.
  • Analysis of bacilli, host cell-mediated response, and dermal microvasculature.

Main Results:

  • LL and BL types showed macrophages with large cytoplasmic processes and peripheral vacuoles; abundant mast cells and vascular alterations were noted.

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  • BT macrophages had regular outlines, multivacuolated cytoplasms, and abundant rough endoplasmic reticulum; giant cells were scarce.
  • Bacilli were intracellular within vacuoles in LL and BL (macrophages, endothelial, Schwann cells), but singly and infrequently in BT (endothelial cells only). Degraded bacilli were more common than intact forms.

    • Conclusions:

    • Leprosy bacilli localization and degradation vary significantly across LL, BL, and BT leprosy types.
    • Ultrastructural findings correlate with host resistance levels in leprosy, with more bacilli and intact forms in less resistant types.