Expression of the 27-kDa heat shock protein in human epidermis and in epidermal neoplasms: an immunohistological study

The British Journal of Dermatology
F TrautingerD Metze

Abstract

The 27-kDa heat shock protein (HSP27) is a member of the small heat shock protein (HSP) family. In addition to its putative function in thermotolerance, this protein may play a part in the regulation of cell growth and differentiation. This study was conducted to assess the significance of the expression of HSP27 in human epidermis and in cutaneous neoplasms. Sixty-two biopsy samples from normal human skin and from inflammatory and neoplastic skin diseases were investigated by immunohistochemistry on formalin-fixed paraffin-embedded tissue sections, using a monoclonal antibody specific for HSP27. In normal human epidermis, HSP27 is expressed in the upper epidermal layers with a cytoplasmic staining pattern. The basal cell layer does not express detectable amounts of HSP27. In hair follicles, staining is mainly confined to the outer root sheath and to the infundibular epithelium. Melanocytes, dermal fibroblasts and endothelial cells do not express detectable amounts of HSP27. HSP27 could not be detected in fetal skin until the 20th week of gestation. Tumour cells in basal and squamous cell carcinomas do not express significant amounts of HSP27. In solar keratoses, seborrhoeic keratoses, human papillomavirus (HPV)-induced hyperpr...Continue Reading

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