1. Background
CKD-519 is a preclinical candidate which induces HDL level by inhibiting CETP. In the oral toxicity study, the exposure of CKD-519 was saturated at 10 times higher level than its therapeutic dose. The toxicity and target organ were not i...
1. Background
CKD-519 is a preclinical candidate which induces HDL level by inhibiting CETP. In the oral toxicity study, the exposure of CKD-519 was saturated at 10 times higher level than its therapeutic dose. The toxicity and target organ were not identified in the 4 week-repeated oral toxicity study because CKD-519 did not show any toxicity even at the highest exposure level. For the toxicity study of CKD-519 at the higher plasma exposure level, rat should be administered with CKD-519 by repeated 24 hr-infusion for 4 weeks. However, few domestic CRO can perform this experiment due to the lack of experience. Therefore, it was appropriate to collaborate with the abroad preclinical CRO with a lot of experience in order to obtain reliable results.
2. Specific Aims
1) Single IV infusion PK study in rat
- To study absorption by infusion at the dose which is expected to give 15 times higher exposure level than oral therapeutic dose did. The dose was determined based on the previous absorption study result with bolus administration of CKD-519. 2) 4-week continuous iv infusion toxicity study in rats
- To perform 4 week-repeated toxicity study by infusion at the dose determined in 1).
3. Results
1) Single IV infusion PK study in rat - When a single dose of 50 or 150 mg was administered using the vehicle, systemic exposure was approximately 132 or 629-fold higher than the exposure when effective dose was administered. 2) 4-week continuous iv infusion toxicity study in rats
① Mortality, Clinical Observations, Opthalmoscopic, Urinalysis, Hematology, Clinical chemistry, Macroscopic, Organ Weights, Microscopic: There were no other test article-related .
② Toxicokinetics : When 50 mg/kg/day, the highest dose, was administered, AUC0-24h at day 28 was approximately 10-fold higher than the exposure when effective dose was administered.
③ Conclusions : CKD-519, when administered as a continuous 24-hour infusion in rats 28 days. There was not test article related mortality or adverse findings and the no-observed-effect level (NOAEL) was considered to be 50 mg/kg/day.
4. Future plan for application of this study result
IND for CKD-519 was approved in Korea and phase I clinical trial is ongoing. We also obtained the technique to do the repeated 24 hr-infusion for 4 weeks, including pitfalls in the procedure, through the collaboration with MPI (USA). In the future, we will provide our know-how and the technique to domestic preclinical CRO.