Thrombomodulin expression on dermal cells in normal and psoriatic skin

Area of Science:

• Dermatology
• Immunohistochemistry
• Cell Biology

Background:

• Dermal cells with dendritic morphology are diverse and identified by specific cell markers.
• Thrombomodulin is a cell surface protein involved in regulating blood coagulation.

Purpose of the Study:

• To characterize the morphology and tissue distribution of thrombomodulin-expressing dermal cells in normal and psoriatic skin.
• To investigate the relationship between thrombomodulin+ dermal cells and other dermal cell populations like dermal dendrocytes and macrophages.

Main Methods:

• Histological analysis of skin sections from normal arm, scalp, and psoriatic lesions.
• Immunohistochemistry using a monoclonal antibody against thrombomodulin.
• Double staining with antibodies for factor XIIIa, CD34, and CD68 in scalp biopsies.

Main Results:

• Thrombomodulin+ dermal cells exhibited distinct morphologies and distributions in normal arm, scalp, and psoriatic skin.
• These cells were negative for factor XIIIa, CD34, and CD68, suggesting they represent a unique dermal cell subset.
• Thrombomodulin+ dermal cells were often found in proximity to factor XIIIa+ dermal dendrocytes.

Conclusions:

• Thrombomodulin+ dermal cells represent a distinct subset of dermal cells, potentially involved in tissue repair.
• These cells may cooperate with dermal dendrocytes to regulate extravascular thrombin homeostasis in skin.
• Understanding these cells offers insights into dermal biology and wound healing processes.