ABSTRACT
In the present work, a recombinant Escherichia coli strain was used for the production of interferon α-2b in both shake flask and in bioreactor. The first part of this research was focused on the investigation of the effect of glucose concentration on the kinetics of cell growth, recombinant protein production and acetate formation. In general, glucose supplementation to culture medium enhanced cell growth when added in concentration between 0-20 g/L. Further increase in glucose level reduces biomass production and enhances acetate accumulation in culture. The results clearly demonstrated that maximal interferon production of 27.7 mg/L was achieved in culture supplemented with 20 g/L glucose. Further improvement in recombinant interferon production process was also achieved by scaling up from shake flask to 16-L stirred tank bioreactor. The maximal volumetric interferon production in bioreactor batch culture was 44.5. mg/L after only 6 hours.
ABSTRACT
El virus de la hepatitis C se ha convertido en la causa principal de hepatitis crónica, cirrosis hepática, hepatocarcinoma, y trasplante de hígado a nivel mundial. OBJETIVO: El presente estudio estuvo dirigido a determinar la evolución virológica, bioquímica e histológica de los pacientes con hepatitis crónica C bajo terapia combinada Interferón a 2b recombinante más ribavirina e identifica los principales factores asociados a las tasas obtenidas de respuesta virológica sostenida. MÉTODOS: Ensayo clínico-terapéutico fase IV, abierto, no controlado y multicéntrico rectorado por el Instituto de Gastroenterología y el Centro de Ingeniería Genética y Biotecnología en el período comprendido de mayo de 2001 a mayo de 2006. La muestra estuvo conformada por 122 pacientes con hepatitis crónica C que cumplieron con criterios de inclusión y exclusión predeterminados. Se utilizó interferón a 2b recombinante (3 millones de unidades 3 veces por semana) más ribavirina (1 000 o 1 200 mg diarios en dependencia del peso corporal) durante 48 sem. RESULTADOS: Se obtuvo una tasa de respuesta virológica y bioquímica sostenida a la semana 72 de 32,8 y 50,8 por ciento respectivamente. Un 41,3 por ciento del total de pacientes experimentó mejoría histológica a expensas de la reducción de la fibrosis y pocos cambios en la inflamación. CONCLUSIONES: Teniendo en cuenta la tasa de respuesta global obtenida, se consideró como tratamiento eficaz para la hepatitis crónica C y se recomendó profundizar en el conocimiento de las características de la infección en Cuba así como en opciones de tratamiento más eficaces para esta enfermedad
The hepatitis C virus becomes in leading cause of chronic hepatitis, hepatic cirrhosis, hepatocarcinoma and liver transplant at world level. OBJECTIVE: The aim of present study is to determine the virological, biochemical and histological course of patients presenting with Chronic hepatitis C under a combination of recombinant Interferon alfa-2b plus Ribavirin and to identify the main factors associated with the rates obtained of virological response. METHODS: A non-controlled and multicenter phase IV clinical-therapeutical trial was sponsored by the Institute of Gastroenterology and the Genetics and Biotechnology Engineering Center from May, 2002 to May, 2006. Sample included 122 patients diagnosed with chronic hepatitis C fulfilling the predetermined inclusion and exclusion criteria. Recombinant Interferon alfa-2b (3 millions of t.i.d units) was used plus Ribavirin (1000 or 1200 mg daily depending on the body weight) during 48 weeks. RESULTS: We achieved a sustained biochemical and virological response rate of 32,8 and 50,8 percent, respectively at week 72. A 41,3, percent from the total of patients had a histological improvement at the expense of reduction of fibrosis and a few changes in inflammation level. CONCLUSIONS: Raking into account the global response rate achieved this combined treatment was considered effectiveness for chronic hepatitis C and we recommended to deepen in the knowledge of infection in Cuba, as well as in more efficient treatment options for this disease