RESUMEN
An open letter written by the Global CRO Council for Bioanalysis (GCC) describing the GCC survey results on stability data from co-administered and co-formulated drugs was sent to multiple regulatory authorities on 14 December 2011. This letter and further discussions at different GCC meetings led to subsequent recommendations on this topic of widespread interest within the bioanalytical community over the past 2 years.
Asunto(s)
Combinación de Medicamentos , Preparaciones Farmacéuticas/análisis , Tecnología Farmacéutica/normas , Biomarcadores/análisis , Cromatografía Líquida de Alta Presión/métodos , Estabilidad de Medicamentos , Regulación Gubernamental , Guías como Asunto , Humanos , Espectrometría de Masas en Tándem/métodosAsunto(s)
Biomarcadores/análisis , Técnicas de Química Analítica/normas , Preparaciones Farmacéuticas/análisis , Calibración , Técnicas de Química Analítica/métodos , Descubrimiento de Drogas/educación , Europa (Continente) , Humanos , Preparaciones Farmacéuticas/normas , Control de Calidad , Estándares de Referencia , Reproducibilidad de los Resultados , Sociedades Científicas , Estudios de Validación como Asunto , Recursos HumanosRESUMEN
In this study, the efficacies of chemotherapy employing nitazoxanide (NTZ), albendazole (ABZ), and a NTZ/ABZ-combination against alveolar echinococcosis (AE) were investigated in an experimental murine model. Following secondary infection, meaning i.p. injection of 20 Echinococcus multilocularis metacestodes, the drugs were administered by intragastric inoculation on a daily bases for a period of 5 weeks. Treatment was started either immediately on the day of infection, or at 2 months p.i., respectively. Application of the NTZ/ABZ-combination starting at 2 months p.i. was proven to be most effective in terms of reducing parasite weight (from 4.42+/-1.03 to 1+/-0.05 g; P=0.01). Inspection of treated parasites by transmission electron microscopy showed that ABZ- and NTZ-treated metacestode tissues, respectively, were heterogeneous in that both largely intact parasites as well as severely altered metacestodes could be observed. NTZ/ABZ-combination treatment induced the most severe ultrastructural alterations, including massive reduction in length and number of microtriches, severely damaged tegumental architecture, and progressive loss of viability of the germinal layer, associated with encapsulation by host connective tissue. A comparative pharmacokinetic study in mice revealed that the application of ABZ and NTZ in combination resulted in a two- to four-fold increase of albendazole sulfoxide serum levels for the period of 4-8 h following drug uptake compared to application of ABZ alone. In a third experiment, mice were orally infected with E. multilocularis eggs, and treated with NTZ starting at 2 months p.i. This resulted in a significantly lower lesion number in treated versus untreated mice (P=0.01). This investigation indicates the potential value for NTZ and/or a combined ABZ/NTZ chemotherapy against AE.