Selective Substrates and Inhibitors for Kallikrein-Related Peptidase 7 (KLK7) Shed Light on KLK Proteolytic Activity in the Stratum Corneum.
Identifieur interne : 000390 ( Main/Exploration ); précédent : 000389; suivant : 000391Selective Substrates and Inhibitors for Kallikrein-Related Peptidase 7 (KLK7) Shed Light on KLK Proteolytic Activity in the Stratum Corneum.
Auteurs : Simon J. De Veer [France] ; Laetitia Furio [France] ; Joakim E. Swedberg [Australie] ; Christopher A. Munro [Australie] ; Maria Brattsand [Suède] ; Judith A. Clements [Australie] ; Alain Hovnanian [France] ; Jonathan M. Harris [Australie]Source :
- The Journal of investigative dermatology [ 1523-1747 ] ; 2017.
Descripteurs français
- KwdFr :
- MESH :
- antagonistes et inhibiteurs : Kallicréines.
- métabolisme : Kallicréines, Épiderme.
- Banque de peptides, Humains.
English descriptors
- KwdEn :
- MESH :
- chemical , antagonists & inhibitors : Kallikreins.
- metabolism : Epidermis, Kallikreins.
- Humans, Peptide Library.
Abstract
Proteases have pivotal roles in the skin's outermost layer, the epidermis. In the stratum corneum, serine proteases from the kallikrein-related peptidase (KLK) family have been implicated in several key homeostatic processes, including desquamation. However, the precise contribution of specific KLKs to each process remains unclear. To address this, we used a chemical biology approach and designed selective substrates and inhibitors for KLK7, the most abundant KLK protease in the stratum corneum. The resulting KLK7 inhibitor is the most potent inhibitor of this protease reported to date (Ki = 140 pM), and displays at least 1,000-fold selectivity over several proteases that are related by function (KLK5 and KLK14) or specificity (chymotrypsin). We then used substrates and inhibitors for KLK5, KLK7, and KLK14 to explore the activity of each protease in the stratum corneum using casein zymography and an ex vivo desquamation assay. These experiments provide the most detailed assessment of each KLK's contribution to corneocyte shedding in the plantar stratum corneum, revealing that inhibition of KLK7 alone is sufficient to block shedding, whereas KLK5 is also a major contributor. Collectively, these findings unveil chemical tools for studying KLK activity and demonstrate their potential for characterizing KLK biological functions in epidermal homeostasis.
DOI: 10.1016/j.jid.2016.09.017
PubMed: 27697464
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">Proteases have pivotal roles in the skin's outermost layer, the epidermis. In the stratum corneum, serine proteases from the kallikrein-related peptidase (KLK) family have been implicated in several key homeostatic processes, including desquamation. However, the precise contribution of specific KLKs to each process remains unclear. To address this, we used a chemical biology approach and designed selective substrates and inhibitors for KLK7, the most abundant KLK protease in the stratum corneum. The resulting KLK7 inhibitor is the most potent inhibitor of this protease reported to date (Ki = 140 pM), and displays at least 1,000-fold selectivity over several proteases that are related by function (KLK5 and KLK14) or specificity (chymotrypsin). We then used substrates and inhibitors for KLK5, KLK7, and KLK14 to explore the activity of each protease in the stratum corneum using casein zymography and an ex vivo desquamation assay. These experiments provide the most detailed assessment of each KLK's contribution to corneocyte shedding in the plantar stratum corneum, revealing that inhibition of KLK7 alone is sufficient to block shedding, whereas KLK5 is also a major contributor. Collectively, these findings unveil chemical tools for studying KLK activity and demonstrate their potential for characterizing KLK biological functions in epidermal homeostasis.</div>
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<name sortKey="Munro, Christopher A" sort="Munro, Christopher A" uniqKey="Munro C" first="Christopher A" last="Munro">Christopher A. Munro</name>
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