Preparation of human epidermal tissue for functional immune studies

Area of Science:

• Dermatology
• Cell Biology
• Immunology

Background:

• Human epidermal single-cell suspensions are crucial for various biological assays.
• Suction blisters offer a method for in vivo skin sampling.
• Epidermal thymocyte activating factor (ETAF/Il-1) is a key inflammatory mediator.

Purpose of the Study:

• To optimize a trypsinization technique for preparing human epidermal single-cell suspensions from suction blisters.
• To evaluate the reliability of suction blisters for in vivo determination of ETAF/Il-1 activity.

Main Methods:

• Optimization of trypsin concentration (Sigma trypsin 0.25%), incubation time (45 min), and temperature (37°C) with shaking.
• Preparation of single-cell suspensions from human epidermal suction blisters.
• Assessment of ETAF/Il-1 activity in epidermal homogenates before and after dialysis.

Main Results:

• The optimal trypsinization conditions yielded the highest epidermal cell count and viability.
• Trypsinization of epidermal tissue reduced ETAF/Il-1 activity.
• Dialysis of epidermal homogenates improved ETAF/Il-1-like activity determination by removing inhibitors.
• Suction blister homogenates provided a reproducible model for ETAF/Il-1-like activity.

Conclusions:

• An optimized trypsinization protocol using Sigma trypsin (0.25%) enhances human epidermal single-cell yield and viability from suction blisters.
• Suction blisters serve as a reliable in vivo model for ETAF/Il-1 determination, though trypsinization affects activity.
• Dialysis is recommended for accurate ETAF/Il-1-like activity assessment in these samples.