Investigating the effect of autoinduction in cynomolgus monkeys of a novel anticancer MDM2 antagonist, idasanutlin, and relevance to humans.

1. Idasanutlin (RG7388) is a potent p53-MDM2 antagonist currently in clinical development for treatment of cancer. The purpose of the present studies was to investigate the cause of marked decrease in plasma exposure after repeated oral administration of RG7388 in monkeys and whether the autoinduction observed in monkeys is relevant to humans. 2. In monkey liver and intestinal microsomes collected after repeated oral administration of RG7388 to monkeys, significantly increased activities of homologue CYP3A8 were observed (ex vivo). Investigation using a physiologically based pharmacokinetic (PBPK) model suggested that the loss of exposure was primarily due to induction of metabolism in the gut of monkeys. 3. Studies in monkey and human primary hepatocytes showed that CYP3A induction by RG7388 only occurred in monkey hepatocytes but not in human hepatocytes, which suggests the observed CYP3A induction is monkey specific. 4. The human PK data obtained from the first cohorts confirmed the lack of relevant induction as predicted by the human hepatocytes and the PBPK modelling based on no induction in humans.

Etiología de la pre-eclampsia: conceptos a considerar / Etiology of pre-eclampsia: concepts to consider

La pre-eclampsia es una condición que afecta a un 5-10% de las mujeres embarazadas. Usualmente se inicia desde la 20ava semana de gestación hasta el post-parto. El cuadro clínico presenta hipertensión, proteinuría e hiperuricemia, potencialmente causando daños renales. Aunque la etiología de esta condición es desconocida, se le han asociado factores bioquímicos e inmunológicos. Idealmente, la comprensión de este fenómeno permitirá planear nuevas estrategias...