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Merck
CN
  • In-vivo evaluation of human recombinant Co-arginase against A375 melanoma xenografts.

In-vivo evaluation of human recombinant Co-arginase against A375 melanoma xenografts.

Melanoma research (2014-10-12)
Vaidehi Agrawal, Jung Hee Woo, Jeremy P Mauldin, Everett M Stone, Cynthia J Meininger, Chanhee Jo, Keri Kleypas, Eugene P Frenkel, Arthur E Frankel
ABSTRACT

Metastatic melanoma is a deadly form of cancer with few therapeutic options and the cause of more than 9480 deaths annually in the USA alone. Novel treatment options for this disease are urgently needed. Here we test the efficacy of a novel melanoma drug, the human recombinant Co-arginase (CoArgIPEG), against an aggressive A375 melanoma mouse model. CoArgIPEG is a modification of the naturally occurring human enzyme with improved stability, catalytic activity, and potentially lower immunogenicity compared with current amino acid-depleting drugs. Marked tumor growth reductions (mean P=0.0057) with apoptosis induction and proliferation inhibition are noted with CoArgIPEG treatment, both in the presence and in the absence of supplemental citrulline. Further, improved therapeutic efficacy has been noted against A375 xenografts relative to the naturally occurring human recombinant arginase enzyme at lower doses of CoArgIPEG. Unfortunately, after 1 month, half of the relapsing tumors showed argininosuccinate synthase induction, which correlated with Ser62-phosphorylated cMyc. Although argininosuccinate synthase induction could not be induced in vitro, a drug targeting pathway previously demonstrated to be associated with Ser62 cMyc phosphorylation - U0126 - in combination with CoArgIPEG demonstrated an in-vitro synergistic response (combination indices 0.13±0.10 and 0.14±0.10 with or without citrulline, respectively). Overall, favorable efficacy and potential synergy with other antimelanoma drugs support CoArgIPEG as a potent, novel cancer therapeutic.

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Glycine, Pharmaceutical Secondary Standard; Certified Reference Material
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MOPS, Vetec, reagent grade
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Glycine, Vetec, reagent grade, 98%
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Glycine, 99%, FCC
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Glycine, ACS reagent, ≥98.5%
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Glycine, meets analytical specification of Ph. Eur., BP, USP, 99-101% (based on anhydrous substance)
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Glycine, puriss. p.a., reag. Ph. Eur., buffer substance, 99.7-101% (calc. to the dried substance)
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Glycine
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BIS-TRIS, BioPerformance Certified, suitable for cell culture, suitable for insect cell culture, ≥98.0%
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Glycine, ReagentPlus®, ≥99% (HPLC)
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BIS-TRIS, ≥98.0% (titration)
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Glycine, BioXtra, ≥99% (titration)
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Glycine, suitable for electrophoresis, ≥99%
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MOPS, ≥99.5% (titration)
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MOPS, BioPerformance Certified, suitable for cell culture, ≥99.5% (titration)
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Glycine, from non-animal source, meets EP, JP, USP testing specifications, suitable for cell culture, ≥98.5%
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BIS-TRIS, Vetec, reagent grade, ≥98%, RNase and DNase free
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Glycine, certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
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Cobalt(II) chloride hexahydrate, reagent grade
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Glycine, tested according to Ph. Eur.
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