Evaluación de la eficacia de VA-MENGOC-BC® en ratón Balb/c retados frente a los serogrupos A, B y C.
VA-MENGOC-BC® efficacy evaluation in Balb/c mice challenged with serogroups A, B and C.
Juan Francisco Infante, Sergio Sifontes, Eddy Caro, Mildrey Fariñas, Armando Cádiz, Armando Acosta, Marielena Sarmiento.
Instituto Finlay. Centro de Investigación-Producción de Vacunas y Sueros. Ciudad de La Habana. Cuba. E-mail: jinfante@finlay.edu.cu
RESUMEN
Hasta la fecha se han desarrollado varios modelos experimentales para la reproducción experimental de la enfermedad meningocócica humana, cuya utilidad en la evaluación de la eficacia de medios de inmunización y terapia, así como en el estudio de la patogenia de la enfermedad es incuestionable. En el presente trabajo se describe la evaluación de la eficacia de VA-MENGOC-BC® y la Inmunoglobulina Humana Antimeningocócica BC frente a Neisseria meningitidis de los serogrupos A, B y C, empleando el ratón Balb/c tratado con mucina y dextrana férrica como estimulantes de la virulencia. Los ratones fueron inmunizados por vía intraperitoneal con una, dos o tres dosis de 0,5 mL de VA-MENGOC-BC®. El intervalo entre dosis fue de tres semanas entre la primera y segunda dosis y de 15 días entre la segunda y la tercera. El reto se realizó con dosis letales (1-3 x DL50) de N. meningitidis A, B ó C a los 15 ó 21 días después de aplicada la última dosis de vacuna. Para evaluar la actividad de la Inmunoglobulina Antimeningocócica BC como medio de inmunización pasiva, se trató otro grupo de ratones, 30 min, 2 y 6 h después habérseles inoculado los gérmenes. Se administraron en cada caso 5 mg de la inmunoglobulina por vía intraperitoneal o intravenosa en un volumen de 0,1 mL. Los resultados demostraron que tanto VA-MENGOC-BC® como la Globulina Antimeningocócica BC confieren protección significativa contra un reto letal con N. meningitidis en el modelo de ratón tratado con factores estimulantes de la virulencia.
ABSTRACT
There are several animal models for the experimental reproduction of human meningococcal disease. Their usefulness in the evaluation of immunization and therapy, as well as in the pathogenesis of the disease is unquestionable. The present paper describes the assessment of the efficacy of VA-MENGOCBC ® and the Human BC Antimeningococcal Globulin against Neisseria meningitidis groups A, B and C using mice treated with iron dextran and mucin as virulence enhancers. Mice were immunized intraperitoneally with one, two or three doses (0.5 mL) of VA-MENGOC-BC®. The time elapsed between the first and a second dose was three weeks and 15 days between the second and the last one. The challenge was performed with lethal doses (1-3xDL50) of N. meningitidis A, B or C, 15 or 21 days after the last immunizing dose. In order to test the efficacy of the Human Antimeningococcal Globulin as a means of passive immunization, a different group of mice was treated 30 min, 2 h and 6 h after bacterial inoculation. Five milligrams of globulin were administered intravenously or intraperitoneally to each mouse. Results demonstrated that VA-MENGOC-BC® and the Human BC Antimeningococcal Globulin confer significant protection against a lethal challenge with N. meningitidis A, B and C in mice treated with virulence enhancement agents.
Keywords: VA-MENGOC-BC®, Human Antimeningococcal Globulin BC, mouse, mucin, iron dextran, challenge, protection.
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