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Skin Biopsy for Diagnosing Discoid Lupus Erythematosus
Published on: June 10, 2025
Are cutaneous microdialysis cytokine findings supported by end point biopsy immunohistochemistry findings?
Florence Sjögren1, Chris D Anderson
1Department of Clinical and Experimental Medicine, Linköping University, Sweden.
Insights
Comparing skin biopsy and microdialysis for cytokine analysis, this study found high concordance for IL8 and IL6. Combining these methods offers a comprehensive view of tissue inflammation and mediator dynamics in clinical research.
Area of Science:
- Dermatology
- Immunology
- Biomedical Engineering
Background:
- Cutaneous microdialysis catheter insertion into normal dermis triggers innate immune responses, inducing cytokines like IL1b, IL6, and IL8 due to minimal trauma.
- Understanding the inflammatory cascade in skin is crucial for various dermatological and immunological research applications.
Purpose of the Study:
- To compare the concordance of cytokine detection between skin biopsy with immunohistochemistry and microdialysis techniques at 24 hours post-insertion.
- To evaluate the utility of microdialysis as a functional and data-generating method in conjunction with traditional biopsy methods for clinical research.
Main Methods:
- Skin biopsies were collected at the microdialysis catheter site 24 hours after insertion.
- Immunohistochemistry was performed on biopsies to detect specific cytokines.
- Microdialysis fluid was analyzed for the same set of cytokines, and results were compared with immunohistochemistry findings.
Main Results:
- High concordance was observed for Interleukin-8 (IL8) (100%), followed by IL6 (70%) and IL1b (50%) between the two methods.
- Concordance for seven additional pro-inflammatory and T cell-related cytokines ranged from 50% to 80%.
- The total number of positive cytokine findings was comparable between microdialysis and immunofluorescence, indicating similar detection capabilities.
Conclusions:
- Both microdialysis and skin biopsy are valuable for studying tissue biology, with microdialysis providing dynamic data and biopsy offering an endpoint assessment.
- Combining microdialysis and biopsy methods in clinical research can elucidate the temporal dynamics of soluble mediators and complement invasive endpoint analysis.
- Microdialysis catheters remain functional at 24 hours, producing relevant data that can be corroborated and extended by concurrent endpoint biopsy analysis.
Abstract:
Insertion of a cutaneous microdialysis catheter into normal dermis has been shown to induce the production of IL1b, IL6 and IL8 in an innate response to minimal trauma. In the present study, skin biopsy for immunohistochemistry has been performed at the site of the microdialysis catheter to compare the findings with that of the microdialysis findings 24 h after insertion. Of the three named cytokines, concordance between the two investigated technologies was highest for IL8 (100%) followed by IL6 (70%) and IL1b (50%). For seven other pro-inflammatory and T cell-relevant cytokines studied, concordance ranged between 50% and 80%. The total number of positive (microdialysis or immunofluorescence) findings was similar between the two methodologies. Technical and biological phenomenon can explain the differences. We conclude that both methodologies illustrate important features of tissue biology and that a combination of the two methods in clinical research can provide the chronology of soluble mediator participation and the more classic, but also more invasive, biopsy-based methodology at a point which constitutes the end of the observation period. We conclude further that at the 24-h time period here studied, microdialysis catheters are still functional and thus capable of producing relevant data which can be corroborated and extended by the "end point biopsy".
