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Dendritic Cell Activation in Leprosy Using CD1a and Factor XIIIa Markers
Kavithamani K1, Sowmya S1, Shanmugasamy K1
1Department of Pathology, Mahatma Gandhi Medical College and Research Institute, Sri Balaji Vidyapeeth (SBV) University, Pondicherry, IND.
Insights
Tuberculoid leprosy (TT) shows increased macrophage activation, indicated by higher expression of CD1a and Factor XIIIa dendritic cells, correlating with a lower bacillary index compared to lepromatous leprosy (LL).
Area of Science:
- Immunology
- Dermatology
- Pathology
Background:
- Leprosy presents diverse clinical forms based on patient immunity, ranging from tuberculoid (TT) to lepromatous (LL).
- Understanding macrophage activation is crucial for leprosy classification and management.
Purpose of the Study:
- To assess macrophage activation in the leprosy spectrum using CD1a and Factor XIIIa immunohistochemical markers.
- To correlate macrophage expression with the morphological spectrum and bacillary index in leprosy.
Main Methods:
- Observational study design.
- Immunohistochemical analysis of CD1a and Factor XIIIa markers on leprosy biopsy samples.
Main Results:
- Higher expression of CD1a (epidermal dendritic cells) and Factor XIIIa (dermal dendritic cells) was observed in Tuberculoid Leprosy (TT) compared to Lepromatous Leprosy (LL).
- CD1a staining intensity was 70% in TT versus 33% in LL.
- Factor XIIIa expression was 90% in TT versus 66% in LL.
Conclusions:
- Increased dendritic cell numbers and staining intensity in the tuberculoid spectrum suggest heightened macrophage activation.
- This macrophage activation may explain the lower bacillary index observed in Tuberculoid Leprosy.
Background:
Leprosy is manifested in varied forms based on the immune status of the patient giving rise to the polar and borderline spectrum of tuberculoid (TT) and lepromatous leprosy (LL). The present study was conducted to assess the macrophage activation in the spectrum of leprosy using CD1a and Factor XIIIa immunohistochemical markers and to correlate the macrophage expression with the morphological spectrum and bacillary index.
Methodology:
The present study was an observational study.
Results:
The present study consisted of 40 biopsy-proven leprosy cases, in which a majority were males, and the most common age group was 20-40 years. The most common type encountered was borderline tuberculoid (BT) leprosy. Expression of epidermal dendritic cells and intensity of staining by CD1a was higher in TT (seven of 10 cases (70%)) when compared to LL (one of three cases (33%)). Similarly, Factor XIIIa showed higher expression of dermal dendritic cells in 90% of TT when compared to LL which was seen in 66%.
Conclusion:
The increased number and strong intensity of dendritic cells in the tuberculoid spectrum may indirectly indicate macrophage activation and possibly account for the low bacillary index.
