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Safety and Toxicity of Recombinant Methioninase and Polyethylene Glycol (PEG) Recombinant Methioninase in Primates

  • Robert M. HoffmanEmail author
  • Zhijian Yang
  • Yuying Tan
  • Qinghong Han
  • Shukuan Li
  • Shigeo Yagi
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1866)

Abstract

Methionine (MET) is a general metabolic therapeutic target in cancer, whereby cancer cells have an elevated requirement for MET, termed MET dependence. We have developed recombinant l-methionine α-deamino-γ-mercaptomethane lyase (recombinant methioninase [rMETase, EC 4.4.1.11]) as targeted therapy of all cancer types. Pharmacokinetics, MET depletion, antigenicity, and toxicity of rMETase were examined in macaque monkeys. Pharmacokinetic analysis showed that rMETase was eliminated with a T1/2 of 2.49 h. A 2-week i.v. administration of 4000 units/kg every 8 h/day for 2 weeks resulted in a steady-state depletion of plasma MET to less than 2 μm. The only manifest toxicity was decreased food intake and slight weight loss. Serum albumin and red-cell values declined transiently during treatment. Rechallenge on day 28 resulted in anaphylactic shock and death in one animal. Pretreatment with hydrocortisone prevented the anaphylactic reaction. Anti-rMETase antibodies (at 10−3) were found after the first challenge, increased to 10−6 after the fourth challenge, and decreased to 10−2 by 2 months post-therapy. Therefore, the therapeutic potential of rMETase is limited by its short plasma half-life and immunologic effects, including high antibody production in mice and anaphylactic reactions in monkeys. To overcome these limits, rMETase has been coupled to methoxypolyethylene glycol succinimidyl glutarate polyethylene glycol (MEGC-PEG-5000). The pharmacokinetics, antigenicity, and toxicity of MEGC-PEG-rMETase in macaque monkeys were evaluated using an escalating-dose strategy. In pharmacokinetic studies, a single 4000 units/kg dose showed that MEGC-PEG-rMETase holoenzyme activity was eliminated with a biological half-life of 1.3 h, and the MEGC-PEG-rMETase apoenzyme was eliminated with a biological half-life of 90 h, a 36-fold increase compared with non-PEGylated rMETase. The disparity in the T½ of the apoenzyme and the holoenzyme reflects the loss of co-factor pyridoxal-l-phosphate of the circulating MEGC-PEG-rMETase. A 7-day i.v. administration of 4000 units/kg every 12 h resulted in a steady-state depletion of plasma MET to <5 μmol/L. The only manifest toxicity was decreased food intake and slight weight loss. Red cell values and hemoglobin declined transiently. Subsequent challenges did not result in any immunologic reactions. Anti-MEGC-PEG-rMETase antibodies were 100- to 1000-fold less than antibodies elicited by naked rMETase, thereby suggesting clinical potential of MEGC-PEG-rMETase as a broad anticancer agent.

Key words

Recombinant methioninase rMETase Polyethylene glycol PEG PEG-rMEtase Macaque monkeys Safety Antigenicity Anaphylaxis Anemia Half-life Holoenzyme Apoenzyme Pyridoxal-l-Phosphate 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Robert M. Hoffman
    • 1
    • 2
    Email author
  • Zhijian Yang
    • 1
  • Yuying Tan
    • 1
  • Qinghong Han
    • 1
  • Shukuan Li
    • 1
  • Shigeo Yagi
    • 3
  1. 1.AntiCancer, Inc.San DiegoUSA
  2. 2.Department of SurgeryUniversity of CaliforniaSan DiegoUSA
  3. 3.AntiCancer JapanTokyoJapan

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