title: A claudin 3 and claudin 4-targeted Clostridium perfringens protoxin is selectively cytotoxic to PSA-producing prostate cancer cells.
abstract: Prostate cancer is the second leading cause of non-cutaneous cancer-related death in males, and effective strategies for treatment of metastatic disease are currently limited. The tight junction proteins, claudin 3 and claudin 4, serve as cell-surface receptors for the pore-forming Clostridium perfringens enterotoxin [CPE]. Most prostate cancer cells overexpress claudin 3 and claudin 4, and claudins are aberrantly distributed over the plasma membrane, making these cells particularly sensitive to cytolysis by CPE. Prostate cancer cells secrete PSA locally that is proteolytically active; however, circulating PSA is inactivated via binding to protease inhibitors. To overcome systemic toxicity of CPE, a modified protoxin was constructed with a tethered ligand attached to the C-terminus connected by a flexible linker containing a PSA-specific protease cleavage site. This engineered protoxin selectively and efficiently lyses PSA-producing prostate cancer cells whereas CLDN3 and CLDN4 positive cells that do not express PSA are resistant to cytolysis.
authors: Department of Urology, Stony Brook University School of Medicine, Stony Brook, NY, United States.
authors: Victor
authors: V
authors: Romanov
authors: Department of Urology, Stony Brook University School of Medicine, Stony Brook, NY, United States.
authors: Terry C
authors: TC
authors: Whyard
authors: Department of Urology, Stony Brook University School of Medicine, Stony Brook, NY, United States.
authors: Wayne C
authors: WC
authors: Waltzer
authors: Department of Medicine, Stony Brook University School of Medicine, Stony Brook, NY, United States. Electronic address: Theodore.Gabig@stonybrookmedicine.edu.
authors: Theodore G
authors: TG
authors: Gabig
mesh_terms: D000595:Amino Acid Sequence; D045744:Cell Line, Tumor; D062465:Claudin-3 / Q000235:genetics / Q000378:metabolism*; D062506:Claudin-4 / Q000235:genetics / Q000378:metabolism*; D003001:Cloning, Molecular; D003016:Clostridium perfringens / Q000378:metabolism*; D004768:Enterotoxins / Q000235:genetics / Q000493:pharmacokinetics / Q000494:pharmacology*; D006801:Humans; D007610:Kallikreins / Q000096:biosynthesis*; D008297:Male; D008969:Molecular Sequence Data; D058990:Molecular Targeted Therapy; D017430:Prostate-Specific Antigen / Q000096:biosynthesis*; D011471:Prostatic Neoplasms / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000493:pharmacokinetics / Q000494:pharmacology; D014162:Transfection
chemical_list: C568122:CLDN3 protein, human; C568157:CLDN4 protein, human; D062465:Claudin-3; D062506:Claudin-4; D004768:Enterotoxins; D011993:Recombinant Fusion Proteins; C035598:enterotoxin, Clostridium; C549870:KLK3 protein, human; D007610:Kallikreins; D017430:Prostate-Specific Antigen
keywords: Claudins; Clostridium perfringens enterotoxin; Prostate cancer; Prostate specific antigen; Protoxin