L. Juhlin, E. Hagforsen, C. Juhlin
DOI: 10.2340/00015555728183

Biopsies of normal and diseased skin were immunohistochemically investigated for the presence of parathyroid hormone-related protein (PTH-rp). In normal skin and several skin disorders a monoclonal antibody against the 34-68 sequence of PTH-rp was found to be exclusively located in the granular layer. PTH-rp could not be detected in untreated psoriatic plaque lesions even when a granular layer was present. Psoriatic lesions improving after 1-2 weeks' treatment with betamethasone or vitamin D3 analogue revealed PTH-rp reactivity just above the granular layer. These findings substantiate a possible role for PTH-rp as a growth inhibitor. In the dermis the granular layer in the upper part of the hair follicles was stained for PTH-rp and the dermal infiltrates in 5 of 10 patients were stained with mycosis fungoides.