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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
Phosphatidylserine: A cancer cell targeting biomarker.
Seminars in Cancer Biology 2018 October
Cancer is a leading cause of mortality and morbidity globally. Many prominent cancer-associated molecules have been identified over the recent years which include EGFR, CD44, TGFbRII, HER2, miR-497, NMP22, BTA, Fibrin/FDP etc. These biomarkers are often used for screening, detection, diagnosis, prognosis, prediction and monitoring of cancer development. Phosphatidylserine (PS) is an essential component in all human cells which is present on the inner leaflet of the cell membrane. The oxidative stress causes exposure of PS on the surface of the vascular endothelium in the cancer cells (lung, breast, pancreatic, bladder, skin, brain metastasis, rectal adenocarcinoma etc.) but not on the normal cells. The external PS is regulated by calcium-dependent flippase activity. Cancer cell lines with high surface PS have low flippase activity and high intracellular calcium content. Human Annexin-V, PS targeting antibodies (PGN635 and bavituximab and mch1N11), lysosomal protein, phospholipid Saposin C dioleoylphosphatidylserine (SapC-DOPS), peptide-peptoid hybrid PPS1, PS-binding 14-mer peptide (PSBP-6) and hexapeptide (E3) have been reported to target PS present on cancer cell surface. High expression of CD47 inhibits tumor cell phagocytosis by macrophages. The PS cancer biomarker has also been used to target the drugs to cancer cells specifically without affecting other healthy cells. Currently, the fusion protein (FP) consisting of L-methionase linked to human Annexin-V has been reported to target the cancer cells. The FP catalyzes the conversion of non-toxic prodrug selenomethionine into toxic methyl selenol which thus also prevents the methionine (essential amino acid) supplementation to the cancer cells.
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