title: Multiple kallikrein (KLK 5, 7, 8, and 10) expression in squamous cell carcinoma of the oral cavity.
abstract: Oral squamous cell carcinoma (OSCC) represents 3% of all cancer deaths in the U.S. and is ranked one of the top 10 cancers worldwide. The 5-year survival rate has remained at a low 50% for the past several decades, necessitating discovery of novel biomarkers of aggressive disease and therapeutic targets. As overexpression of urinary type plasminogen activator and receptor (uPA/R) in OSCC is associated with malignant progression and poor outcome, cell lines were generated with either overexpression (SCC25-uPAR+) or silencing (SCC25-uPAR-KD) of uPAR. As SCC25-uPAR+ tumors behaved more aggressively both in vitro and in vivo, comparative cDNA microarray analysis was used to identify additional genes that may be associated with aggressive tumors. Four members of the human tissue kallikrein family (KLK 5, 7, 8, and 10) were identified and real-time RT-PCR (qPCR) was used to verify and quantify gene expression. qPCR analysis revealed 2.8-, 5.3-, 4.0-, and 3.5-fold increases in gene expression for KLK5, 7, 8, and 10, respectively, in SCC25-uPAR+ versus SCC25-uPAR-KD. Immunohistochemical analysis demonstrated strong reactivity for KLKs 5, 7, 8 and 10 in both orthotopic murine tumors and human OSCC tissues. Control experiments show lack of reactivity against KLK3 (prostate specific antigen). These results demonstrate that kallikreins 5, 7, 8, and 10 are abundantly expressed in human OSCC and may be implicated in malignant progression.
authors.affiliation: Department of Pathology & Anatomical Sciences, University of Missouri School of Medicine, Columbia, MO 65212, USA.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Pettus
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Johnson
authors.forename: Zonggao
authors.initials: Z
authors.lastname: Shi
authors.forename: J Wade
authors.initials: JW
authors.lastname: Davis
authors.forename: Jennifer
authors.initials: J
authors.lastname: Koblinski
authors.forename: Supurna
authors.initials: S
authors.lastname: Ghosh
authors.forename: Yueying
authors.initials: Y
authors.lastname: Liu
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Ravosa
authors.forename: Shellaine
authors.initials: S
authors.lastname: Frazier
authors.forename: M Sharon
authors.initials: MS
authors.lastname: Stack
mesh_terms: D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D045744:Cell Line, Tumor; D018450:Disease Progression; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007610:Kallikreins / Q000096:biosynthesis*; D051379:Mice; D008819:Mice, Nude; D009062:Mouth Neoplasms / Q000378:metabolism*; D009368:Neoplasm Transplantation; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: C100936:KLK10 protein, human; C400147:KLK5 protein, human; C082472:KLK7 protein, human; C094799:KLK8 protein, human; D007610:Kallikreins