Abstract
Background
The stratum corneum chymotryptic enzyme (SCCE) and the stratum corneum tryptic enzyme
(SCTE) are serine proteases of the kallikrein family that are encoded by the KLK7 and KLK5 genes, respectively. They might play a role in desquamation by cleaving corneodesmosomal
proteins. Their activities are regulated by lympho-ephithelial Kazal-type related
inhibitor (LEKTI), which is encoded by the SPINK5 gene.
Objective
To elucidate the role of these molecules in ultraviolet B (UVB)-induced desquamation
of the stratum corneum, we examined the effect of UVB irradiation on the expression
of these enzymes in human epidermal keratinocytes.
Methods
The effects of UVB on SCCE (KLK7), SCTE (KLK5) and LEKTI (SPINK5) expression in keratinocytes were estimated using HaCaT cells, normal human epidermal
keratinocytes and a reconstructed human epidermis model.
Results
UVB irradiation significantly reduced the expression of SPINK5 and increased the expression of KLK5 and KLK7, as assessed by real-time PCR, and reduced the expression of LEKTI and increased
the expression of SCTE and SCCE by Western blotting and/or immunofluorescence analysis.
Protease activity, as assessed by in situ zymography, was enhanced in the epidermis following exposure to UVB irradiation compared
with sham-irradiated epidermis.
Conclusion
These results suggest that reduced expression of LEKTI and increased expression of
SCCE and SCTE in human epidermal keratinocytes after UVB irradiation may contribute
to desquamation of the stratum corneum.
Keywords
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Article info
Publication history
Published online: July 12, 2010
Accepted:
November 13,
2008
Received in revised form:
November 5,
2008
Received:
July 9,
2008
Identification
Copyright
© 2008 Japanese Society for Investigative Dermatology. Published by Elsevier Inc. All rights reserved.
