A prostaglandin D-synthase-positive mast cell gradient characterizes scalp patterning

Area of Science:

• Dermatology
• Hair Biology
• Cellular Biology

Background:

• Pattern (androgenetic) alopecia is a common cause of non-scarring hair loss.
• Prostaglandin D-synthase is elevated in bald scalp areas of patients with androgenetic alopecia.
• This suggests a potential inherent scalp 'field' vulnerability to hair loss.

Purpose of the Study:

• To investigate the spatial distribution of prostaglandin D-synthase in scalp skin.
• To determine if this distribution pattern relates to androgenetic alopecia.
• To identify the cell types expressing prostaglandin D-synthase in the scalp.

Main Methods:

• Immunohistochemical mapping of prostaglandin D-synthase expression across the scalp in 11 cadavers.
• Dual labeling techniques to identify expressing cell types.

Main Results:

• Significantly higher prostaglandin D-synthase immunoreactive mast cells in the vertex compared to lateral scalp.
• This expression pattern decreased spatially, approximating androgenetic alopecia.
• The pattern was consistent in both balding and non-balding scalps and across genders.

Conclusions:

• Scalp exhibits a spatial programming of mast cell prostaglandin D-synthase distribution.
• This inherent pattern resembles the distribution seen in androgenetic alopecia.
• Mast cell prostaglandin D-synthase distribution may play a role in scalp vulnerability to hair loss.