Abstract:
:The presence of albumin in the human epidermis has been reported more than a decade ago, but until now, it was assumed that this protein is synthesized in the liver and transported to the avascular skin. To our knowledge, transcription of albumin in the human epidermis was never considered. In this report, we present for the first time evidence for autocrine synthesis of albumin in the human epidermis in keratinocytes in situ and in vitro. Using double immunofluorescence labelling, we identified that albumin colocalized together with its transcription factor PCD/DCoH/HNF-1alpha in suprabasal keratinocytes in human full-thickness skin sections and in keratinocytes cultured in serum-free medium. Moreover, albumin and HNF-1alpha protein expression was confirmed by Western blotting in undifferentiated and differentiated keratinocytes as well as in human epidermal suction blister roof extracts. Reverse-transcriptase polymerase chain reaction analysis from human epidermal keratinocytes and epidermal suction blister roofs revealed the transcription of albumin. Using in vivo fluorescence excitation spectroscopy at the surface of human skin, we confirmed albumin as a major constituent yielding a lambda(max) at 295 nm, which was assigned to the single tryptophan 214 fluorophore in this protein. This in vivo result is in agreement with albumin concentrations of 10(-3) M, underlining the importance of this protein in epidermal homeostasis.
journal_name
Exp Dermatoljournal_title
Experimental dermatologyauthors
Hasse S,Kothari S,Rokos H,Kauser S,Schürer NY,Schallreuter KUdoi
10.1111/j.0906-6705.2005.00265.xsubject
Has Abstractpub_date
2005-03-01 00:00:00pages
182-7issue
3eissn
0906-6705issn
1600-0625pii
EXD265journal_volume
14pub_type
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