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• W2056535793 abstract "Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CASelective high affinity ligands (SHALs) are novel targeting agents composed of lysine/mini-polyethylene glycol scaffolds linking two or three ‘recognition’ ligands together. The tridentate SHAL SH7139 is selectively cytotoxic at sub-nanomolar concentrations to lymphoma cells over-expressing HLA-DR10. Electron microscopy examinations of Burkitt's lymphoma xenografts from mice treated with SH7139 suggest one mechanism for cell killing may involve cell signaling-induced apoptosis analogous to that observed with Lym-1 antibody. An alternative mechanism is that intracellular hydrolysis of the SHAL's amide bonds following its uptake and metabolism by lymphoma cells could lead to the release of the three recognition ligands and the subsequent inhibition (or promotion) of cellular activities that trigger apoptosis or induce cell death and necrosis. Each of the three recognition ligands (Dv, Ct, and Cb) is independently, but non-selectively, toxic to both Raji (HLA-DR10 positive) and Jurkat (HLA-DR10 negative) cells. The Ct ligand, 3-(2-([3-chloro-5-trifluoromethyl)-2-pyridinyl]oxy)-anilino)-3-oxopropanionic acid, is a structural analog of aryloxyphenoxypropionate herbicides that inhibit acetyl-CoA carboxylase (ACC), a key enzyme in fatty acid biosynthesis that is upregulated in many cancers to meet their need for rapid growth and proliferation. Our studies show that although Ct could be accommodated into the herbicide binding pocket of ACC, this ligand was not found to inhibit human and rat ACC1 or ACC2. However, metabolic cleavage of the single amide bond present in Ct would lead to the production of two smaller metabolites, an aniline derivative and malonate, both of which are known to be biologically active and potentially toxic compounds. The Dv ligand, dabsyl-L-valine, belongs to a family of biphenylsulfonamides, many of which have been shown to inhibit matrix metalloproteinases such as MMP9 and MMP14 that are upregulated in tumor cells. The Cb ligand, 4-[4-(4-chlorobenzyl)piperazino]-3-nitrobenzene carboxylic acid, is a structural analog of a large number of inhibitors that have been shown to block the assembly of the contractile ring and the initiation of cytokinesis by inhibiting guanosine nucleoside binding to MgcRacGAP, a protein that participates in the activation of the myosin motor and the initiation of cleavage furrow ingression. A combination of SH7139 metabolism studies, computer modeling, and enzyme inhibition assays have been performed to determine if Ct, Dv and Cb and their metabolites are produced and whether they contribute to lymphoma cell killing.Citation Format: Monique C. Balhorn, Gary Mirick, Dong Cheng, Zhengping Ma, Edmond Y. Lau, Saphon Hok, Gerald L. DeNardo, Rod Balhorn. Intracellular uptake and metabolism of SH7139: Is it a targeted prodrug for B-cell lymphomas. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 5460. doi:10.1158/1538-7445.AM2014-5460" @default.
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• W2056535793 date "2014-09-30" @default.
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• W2056535793 title "Abstract 5460: Intracellular uptake and metabolism of SH7139: Is it a targeted prodrug for B-cell lymphomas" @default.
• W2056535793 doi "https://doi.org/10.1158/1538-7445.am2014-5460" @default.
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