Kallikrein-5, formerly known as stratum corneum tryptic enzyme (SCTE), is a serine protease expressed in the epidermis. In humans it is encoded by the KLK5gene.[5][6][7][8][9][10] This gene is one of the fifteen kallikrein subfamily members located in a cluster on chromosome 19. Its expression is up-regulated by estrogens and progestins. Alternative splicing results in multiple transcript variants encoding the same protein.[10]
KLK5 has been suggested to regulate cell shedding (desquamation) in conjunction with KLK7 and KLK14, given its ability to degrade proteins which form the extracellular component of cell junctions in the stratum corneum. It is proposed that KLK5 regulates this process since it is able to self-activate in addition to activating KLK7 and KLK14.[11]
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^Diamandis, Eleftherios P.; Deperthes, David; Lundwall, Åke (Jun 2006). "Proceedings of the 1st International Symposium on Kallikreins, Lausanne, Switzerland, September 1-3, 2005". Biol Chem. 387 (6): 635–824. doi:10.1515/BC.2006.081. PMID16800723. S2CID83910246.
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Yousef GM, Luo LY, Diamandis EP (2000). "Identification of novel human kallikrein-like genes on chromosome 19q13.3-q13.4". Anticancer Res. 19 (4B): 2843–52. PMID10652563.
Gan L, Lee I, Smith R, et al. (2001). "Sequencing and expression analysis of the serine protease gene cluster located in chromosome 19q13 region". Gene. 257 (1): 119–30. doi:10.1016/S0378-1119(00)00382-6. PMID11054574.
Yousef GM, Scorilas A, Chang A, et al. (2002). "Down-regulation of the human kallikrein gene 5 (KLK5) in prostate cancer tissues". Prostate. 51 (2): 126–32. doi:10.1002/pros.10067. PMID11948967. S2CID44645840.
Yousef GM, Obiezu CV, Jung K, et al. (2003). "Differential expression of Kallikrein gene 5 in cancerous and normal testicular tissues". Urology. 60 (4): 714–8. doi:10.1016/S0090-4295(02)01811-3. PMID12385949.
Dong Y, Kaushal A, Brattsand M, et al. (2004). "Differential splicing of KLK5 and KLK7 in epithelial ovarian cancer produces novel variants with potential as cancer biomarkers". Clin. Cancer Res. 9 (5): 1710–20. PMID12738725.
Yousef GM, Kapadia C, Polymeris ME, et al. (2003). "The human kallikrein protein 5 (hK5) is enzymatically active, glycosylated and forms complexes with two protease inhibitors in ovarian cancer fluids". Biochim. Biophys. Acta. 1628 (2): 88–96. doi:10.1016/s0167-4781(03)00116-7. PMID12890555.
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