Thumbnail
Access Restriction
Open

Author Herron, C. E. ♦ Brueckner, C. C. ♦ Chism, J. P. ♦ Kemp, D. C. ♦ Prescott, J. S. ♦ Smith, G. A. ♦ Melich, D. H. ♦ Oleas, N. ♦ Polli, J. W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ ABSORPTION ♦ BILIARY TRACT ♦ CHOLESTEROL ♦ COBALT ARSENIDES ♦ CYTOCHROMES ♦ DISEASE INCIDENCE ♦ DOGS ♦ DRUGS ♦ GASTROINTESTINAL TRACT ♦ GTP-ASES ♦ HEMORRHAGE ♦ LIVER ♦ MEETINGS ♦ METABOLITES ♦ OXIDOREDUCTASES ♦ RECEPTORS ♦ TOXICITY
Abstract HMG-CoA reductase inhibitors (e.g., statins) are an important clinical option to lower cholesterol and treat co-morbidities. Atorvastatin is the most prescribed statin and has obtained generic status. We recently had a clinical development program evaluating a combination of atorvastatin with a GPR119 agonist as a treatment for dyslipidemia, where toxicological evaluations in dogs were completed. There were several challenges related to selecting doses for atorvastatin, including understanding the dose–exposure relationship from different drug forms used by the innovator in their general toxicology studies, bioanalytical assays that did not separate and quantify parent from metabolites, and high variability in the systemic exposures following oral dosing. The studies in this report characterized the toxicokinetics and toxicity of atorvastatin in the dog for up to 13-weeks. Overall, there were no notable differences in the toxicokinetics of atorvastatin or the two active hydroxylated metabolites between the sexes at Week 13. However, systemic exposures were markedly lower at Week 13 compared to that observed at Week 4, suggesting induction of metabolism or reduced absorption from the gastrointestinal tract following oral dosing. Changes in laboratory chemistries included increased liver enzyme levels and lower cholesterol levels. Histopathologic evaluation revealed multifocal minimal to slight hemorrhages in the submucosa of the gallbladder; all findings were reversible. The information from these studies along with the existing clinical experience with atorvastatin can be used to design robust toxicology studies in dogs and reduce animal use. - Highlights: • Atorvastatin is given to reduce cholesterol and is available as a generic drug. • Co-dosing of multiple products to treat hypercholesterolemia is increasing. • This work characterized the toxicokinetics and toxicity of atorvastatin in dogs. • The toxicokinetics of two hydroxylated metabolites were determined. • Recommendations on the dose–exposure relationship in dog are provided.
ISSN 0041008X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-15
Publisher Place United States
Journal Toxicology and Applied Pharmacology
Volume Number 289
Issue Number 1


Open content in new tab

   Open content in new tab