Revisiting the Experimental Methods for Human Skin T-Cell Analysis.

Area of Science:

• Immunology
• Dermatology
• Cell Biology

Background:

• Tissue-resident memory T cells reside in both epidermal and dermal layers of human skin.
• Analyzing these skin-resident T cells necessitates specific tissue processing techniques.

Purpose of the Study:

• To evaluate the limitations of different methods used for isolating epidermal and dermal T cells from human skin.
• To compare the effects of dispase II incubation, enzymatic digestion, scraping, and spontaneous migration on T-cell antigen integrity and cell yield.

Main Methods:

• Human skin samples were processed using dispase II to separate epidermis and dermis.
• Methods compared included subsequent enzymatic digestion (e.g., collagenases), direct scraping, and spontaneous migration.
• Antigen modulation and T-cell yield were assessed for each method.

Main Results:

• Dispase II incubation alone cleaves T-cell antigens; further digestion with collagenases exacerbates this cleavage.
• The scraping method preserves T cells from dispase II effects but results in low cell yield.
• Spontaneous migration preserves/upregulates antigens with T-cell activation but leads to approximately 20% T-cell loss, with no significant bias in CD103 expression.

Conclusions:

• Each method for isolating skin T cells presents distinct advantages and disadvantages.
• The choice of method depends on the specific research question, balancing antigen preservation, cell yield, and potential T-cell activation.
• Understanding these limitations is crucial for accurate analysis of epidermal and dermal T cells.