1. Four-week repeated dose oral toxicity study of KDS2010, a novel selective monoamine oxidase B inhibitor, in Sprague Dawley rats
- Author
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Doo-Wan Cho, Young-Su Yang, Han Young Eom, Su-Cheol Han, Bo Ko Jang, Kim Bo Kyung, Ki Duk Park, Seung-Hyuk Shin, Da-Hee Kim, Mi-Jin Yang, Ji-Seok Han, and Kyung-Tai Kim
- Subjects
Male ,medicine.medical_specialty ,Monoamine Oxidase Inhibitors ,Time Factors ,No-observed-adverse-effect level ,Administration, Oral ,010501 environmental sciences ,Toxicology ,030226 pharmacology & pharmacy ,01 natural sciences ,Rats, Sprague-Dawley ,03 medical and health sciences ,0302 clinical medicine ,Atrophy ,Oral administration ,Internal medicine ,medicine ,Animals ,Toxicokinetics ,Toxicity Tests, Chronic ,Monoamine Oxidase ,Hyaline ,0105 earth and related environmental sciences ,Kidney ,Dose-Response Relationship, Drug ,business.industry ,General Medicine ,medicine.disease ,Epididymis ,Rats ,Basophilic ,medicine.anatomical_structure ,Endocrinology ,Female ,business - Abstract
Repeated dose oral toxicity and toxicokinetic of KDS2010, a new drug for Parkinson's disease, was investigated after 4-week repeated oral administration at 30, 50, 75, or 100 mg/kg/day in rats. Body weight and body weight gain decreased in rats of both sexes in the 75 and 100 mg/kg groups, and food consumption was reduced in male rats of the 75 and 100 mg/kg male groups. Histological alterations were observed in the kidney (urothelial hyperplasia, inflammatory cell infiltration in the renal pelvis, tubular vacuolation/degeneration, basophilic tubules, and hyaline droplets in the proximal tubules) of the 75 and 100 mg/kg male groups and the 50 and 100 mg/kg female groups. The 75 and 100 mg/kg male groups showed adverse effect in the testes (degeneration/exfoliation of germ cells, seminiferous tubules atrophy) and epididymis (cellular debris, oligospermia). These changes were partially recovered after a 2-week recovery period. However, basophilic tubules and hyaline droplets in the proximal tubules in the kidney and germ cell degeneration/exfoliation in the testis were not recovered. In toxicokinetics study, systemic exposure to KDS2010 increased proportionally in both sexes by in a dose -dependent manner. In addition, repeated administration for 4 weeks led to increased tendency of systemic exposure in both sexes compared with that in Day 1. In conclusion, KDS2010 was shown to target the kidney and testis with a no-observed-adverse-effect level of 50 and 30 mg/kg/day for males and females, respectively.
- Published
- 2020