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Macrophages in melanocytic naevi
E B Bröcker1, C Reckenfeld, H Hamm
1Department of Dermatology, University of Würzburg, Federal Republic of Germany.
Archives of Dermatological Research
|January 1, 1992
Summary
Inflammatory infiltrates in benign melanocytic nevi (MN) were compared to melanoma. Researchers found similar HLA-DR+ cells in MN and melanoma, but more CD1+ cells in MN. Macrophage patterns in nevi do not predict melanoma precursors.
Area of Science:
- Immunology
- Dermatopathology
- Oncology
Background:
- Inflammatory infiltrates in malignant melanoma are well-studied.
- In contrast, the immune cell infiltrates associated with benign melanocytic nevi are poorly understood.
- Investigating these infiltrates may reveal insights into melanoma development.
Purpose of the Study:
- To characterize and compare the immune cell infiltrates in benign melanocytic nevi (MN), primary cutaneous melanomas (PCM), and normal skin.
- To determine if specific inflammatory patterns in MN can predict melanoma precursors.
Main Methods:
- Used monoclonal antibodies to analyze HLA-DR antigens, CD1 antigen, transferrin receptor, and macrophage subpopulations.
- Examined frozen fresh tissue samples from 87 MN, 10 PCM, and 10 normal skin samples.
- Compared immune cell populations across the different tissue types and MN subtypes.
Main Results:
- Melanocytic nevi (MN) showed abundant HLA-DR+ cells, similar to primary cutaneous melanomas (PCM) and significantly more than normal skin.
- Dermal CD1+ dendritic cells were more numerous in MN than in PCM and normal skin.
- Macrophage populations expressing transferrin receptor or specific antigens (27E10, RM3/1, 25F9) were higher in MN than normal skin but lower than in PCM.
- No significant differences in macrophage subpopulations were observed among congenital, common acquired, or dysplastic MN.
- No correlations were found between macrophage infiltrates and nevus location or patient age.
Conclusions:
- The immune cell infiltrates, particularly macrophage patterns, in benign melanocytic nevi do not serve as reliable indicators for identifying potential melanoma precursors.
- Benign melanocytic nevi exhibit distinct inflammatory cell profiles compared to normal skin, with some similarities to malignant melanoma, particularly regarding HLA-DR+ cells.