Abstract
Purpose
Acetylation of histones by histone acetyl transferases (HATs) leads to transcriptional activation, while histone deacetylase (HDAC) activity leads to transcriptional repression. Abnormalities of histone acetylation are associated with the malignant phenotype. Depsipeptide (FR901228) inhibits HDAC and has shown anticancer activity in preclinical models. We studied the plasma and cerebrospinal fluid (CSF) pharmacokinetics of depsipeptide in a nonhuman primate model that is highly predictive of human CSF penetration.
Design
Depsipeptide was administered intravenously at a dose of 10 mg/m2 over 4 h to three different animals. Serial blood samples were obtained from all animals and serial CSF samples were obtained from two animals. Plasma and CSF concentrations of depsipeptide were measured using liquid chromatography/tandem mass spectrometry. Concentration-versus-time data were modeled using model-independent and model-dependent methods.
Results
The peak plasma concentration (median±SD) was 245±50 nM and occurred within the first 2 h of the infusion. The terminal half-life was 205±315 min, the AUC extrapolated to infinity was 50±15 μM·min, and the total body clearance was 350±65 ml/min/m2. In the two animals that had CSF sampling performed, the CSF peak concentration was 3.6 nM in one animal and 2.3 nM in the other, and the CSF half-lives were 250 and 325 min. The CSF penetration of depsipeptide (AUCCSF:AUCplasma) was 2% in each animal. Observed changes included anorexia, fatigue, elevation of creatine phosphokinase (CPK) enzyme levels (muscle fraction), and transient early leukopenia. All animals recovered without sequelae.
Conclusions
Although the CSF exposure to depsipeptide after intravenous administration was only 2%, CSF concentrations approached the IC50 of depsipeptide in vitro for some tumors. Systemic administration of this agent may be useful for the treatment of leptomeningeal tumors.
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Berg, S.L., Stone, J., Xiao, J.J. et al. Plasma and cerebrospinal fluid pharmacokinetics of depsipeptide (FR901228) in nonhuman primates. Cancer Chemother Pharmacol 54, 85–88 (2004). https://doi.org/10.1007/s00280-004-0766-5
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DOI: https://doi.org/10.1007/s00280-004-0766-5