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Intradermal bleomycin injections into normal human skin. A histopathologic and immunopathologic study
S F Templeton1, A R Solomon, R A Swerlick
1Department of Dermatology, Emory University, Atlanta, Ga.
Archives of Dermatology
|May 1, 1994
Summary
Intradermal bleomycin injections cause localized inflammation and skin cell damage in normal skin. This response involves immune cell activation and may resemble neutrophilic eccrine hidradenitis.
Area of Science:
- Dermatology
- Immunology
- Cell Biology
Background:
- Intralesional bleomycin effectively treats warts via DNA and antiviral mechanisms.
- The precise inflammatory response to bleomycin in normal skin requires further characterization.
Purpose of the Study:
- To investigate the clinical, histologic, and immunopathologic effects of intradermal bleomycin injections in normal human skin.
- To establish a dose-response relationship for bleomycin-induced inflammation.
Main Methods:
- Four volunteers received multiple intradermal bleomycin injections at varying doses.
- Biopsy specimens were collected at different time points for routine histology and immunopathology.
- Analysis focused on epidermal and dermal changes, inflammatory cell infiltrates, and expression of adhesion molecules.
Main Results:
- Injections induced a localized, dose-dependent inflammatory reaction and hyperpigmentation.
- Histology revealed epidermal and eccrine keratinocyte damage with a neutrophilic infiltrate, mimicking neutrophilic eccrine hidradenitis.
- Upregulation of HLA-DR, ICAM-1, and ELAM-1 was observed on keratinocytes and dermal vessels.
Conclusions:
- Intradermal bleomycin is cytotoxic to keratinocytes and eccrine epithelium.
- Immune system activation, including cellular response and cytokine secretion, occurs post-injection.
- Histopathologic findings can resemble neutrophilic eccrine hidradenitis.