The development of an oral prodrug, SR-2545, of the 2-nitroimidazole radiosensitizer SR-2508
- Stanford Univ., CA
SR-2508, a 2-nitroimidazole radiosensitizer, is expected to be clinically superior to desmethylmisonidazole or misonidazole because of its lower lipophilicity with subsequent lower drug levels in neural tissue and more rapid plasma eliminaton. The intravenous route of administration will be optimal but oral drugs may be necessary. Since decreased lipophilicity will decrease oral absorption we have synthesized, and tested in mice, SR-2545, an acetate ester prodrug of SR-2508. In the liver there is complete first pass metabolism to parent drug with no prodrug detectable in the blood. Compared to an equal dose of oral SR-2508, the prodrug yields a more rapid, reproducible, plasma peak with twice the bioavailability, peak plasma concentration and radiosensitizaton. If oral preparations of SR-2508 are to be used in the clinic the prodrug, SR-2545, is likely to be superior to oral SR-2508.
- OSTI ID:
- 6718779
- Journal Information:
- Int. J. Radiat. Oncol., Biol. Phys.; (United States), Vol. 8:3/4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pharmacokinetics and tumor and neural tissue penetrating properties of SR-2508 and SR-2555 in the dog-hydrophilic radiosensitizers potentially less toxic than misonidazole
Partition coefficient as a guide to the development of radiosensitizers which are less toxic than misonidazole
Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
62 RADIOLOGY AND NUCLEAR MEDICINE
CARBOXYLIC ACID ESTERS
METABOLISM
RADIOSENSITIZERS
ORAL ADMINISTRATION
IMIDAZOLES
LIVER
MICE
NERVOUS SYSTEM
NITRO COMPOUNDS
PHARMACOLOGY
ANIMALS
AZOLES
BODY
DIGESTIVE SYSTEM
DRUGS
ESTERS
GLANDS
HETEROCYCLIC COMPOUNDS
MAMMALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
RODENTS
VERTEBRATES
550500* - Metabolism
560305 - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)
550603 - Medicine- External Radiation in Therapy- (1980-)