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A proteomics approach with detection on western blots using an S-peptide tagged pan-tNOX (ENOX2) recombinant (scFv) antibody followed by alkaline phosphatase-linked anti S has revealed a family of more than 20 ENOX2 isoforms of varying molecular weights (34 to 94 kDa) and mostly of low isoelectric points (4.6 ± 0.7) based on serum analysis. Different isoforms characterize cancers of different tissue origins indicative of both cancer presence and tissue site of origin. ENOX2 proteins are cancer-associated and differ from constitutive (CNOX or ENOX1) proteins primarily by the absence of a drug binding site to which the cancer-specific scFv is directed. All are located on the cell surface where they function both as terminal oxidases for plasma membrane electron transport and carry out protein disulfide-thiol interchange. These proteins are shed into the blood and can also be found in urine. The tNOX isoform technology is under development as a clinical aid to identify unknown or uncertain primary cancers, evaluation of metastatic spread in post surgery patients, monitoring remission following cessation of therapy and for early diagnosis in at-risk populations.
BioFactors – IOS Press
Published: Jan 1, 2009
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