Abstract
Expression of cell death regulators RIPK-1 and RIPK-3 in mouse and human hair follicle structures was studied by immunohistochemistry. At anagen and catagen stages of mouse hair follicle, RIPK-1+ cells were located in the inner root sheath, whereas RIPK-3+ cells were found in the inner and outer root sheath, dermal papilla, and interfollicular epidermis. RIPK-1 expression intensity was low in the early anagen and increased as mature anagen and catagen approached. RIPK-1+ and RIPK-3+ cells were also found in human hair follicle. It is assumed that the role of necroptosis markers in hair follicle life activity is independent of programmed cell death and that they may have yet unknown functions and take part in noncanonical signal cascades.
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