First human administration of mr04a3: A novel water-soluble nonbenzodiazepine sedative

J. Robert Sneyd*, Ann E. Rigby-Jones, Maurice Cross, Hideharu Tominaga, Satoshi Shimizu, Takako Ohkura, Karen Grimsehl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND: JM-1232(-), (-)-3-[2-(4-methyl-1-piperazinyl)-2-oxoethyl]-2-phenyl-3,5,6,7-tetrahydrocyclopenta [f]isoindol-1(2H)-one, molecular formula, C(24)H(27)N(3)O(2); molecular weight, 389.49, is a novel isoindoline water-soluble benzodiazepine receptor agonist with favorable anesthetic/sedative properties in animals. MR04A3 is a 1% aqueous presentation of JM-1232(-). METHODS: In Step 1, healthy male volunteers received 10-min infusions of MR04A3, 0.05, 0.1, 0.2, 0.4, and 0.8 mg/kg, with three MR04A3 subjects and one placebo subject per dose concentration. In Step 2, doses were 0.025, 0.05, 0.075, 0.1, 0.2, 0.3, and 0.4 mg/kg over 1 min with six MR04A3 subjects and one placebo subject per dose concentration. RESULTS: Hypnotic effects of MR04A3 were seen at all dose concentrations in Step 1 and at doses of 0.075 mg/kg or more in Step 2. Central nervous system effect was seen at all dose concentrations with larger doses of MR04A3 producing a deeper and longer reduction in bispectral index. Ramsay sedation scores were increased with higher doses causing sedation and then unresponsiveness. The adverse event profile of subjects receiving MR04A3 was similar to that of subjects given placebo except that some subjects receiving MR04A3 developed upper airway obstruction while sedated. This responded to simple maneuvers (i.e., chin lift). Changes in systolic arterial blood pressure and heart rate were minimal. CONCLUSIONS: MR04A3 is hypnotic in man with a satisfactory hemodynamic and safety profile.
Original languageEnglish
Pages (from-to)385-395
Number of pages11
JournalAnesthesiology
Volume116
Issue number2
DOIs
Publication statusPublished - Feb 2012

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

Keywords

  • Adolescent
  • Adult
  • Benzodiazepines
  • Dose-Response Relationship
  • Drug
  • Humans
  • Hypnotics and Sedatives
  • Isoindoles
  • Male
  • Piperazines
  • Solubility
  • Water
  • Young Adult

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