Dinamica de resuuesta inmune primaria y secundaria: modelo: anticuerpos anti hbs / Dynamics of the immune primary and secondary response: Model, antibodies HBS

Se estudió la cinética individual y colectiva de la dinámica de la respuesta inmune y sus categorías, utilizando como modelo la respuesta de anticuerpos contra el antígeno de superficie del virus productor de la hepatitis B. En estudiantes de Medicina latinoamericanos, de 20 años promedio, se cuantificó la permanencia de niveles de anticuerpos después de 3 años de un esquema completo de inmunización y se encontraron valores promedio de 168 UI/L, un incremento de 757 UI/L en 15 días post refuerzo, lo que permitió estudiar el índice de memoria / durabilidad que fue 5,5 y conocer el incremento en UI/L por día y por microgramo de antígeno: 29 UI/ µg de antígeno. Se estimó, a partir de los valores de durabilidad a los 3 años de vacunados, la intensidad de la respuesta post esquema, que fue 336UI/L; igualmente a partir de los valores alcanzados al analizar memoria, 925 UI/L, pronosticamos una seroprotección hasta 18 años más, es decir, hasta el 2023. Obtuvimos resultados preliminares de utilización del modelo cinético para estudio de inmunoeficiencia.

It was studied the individual and collective kinetics of the dynamics of the immune response and their categories using like a model the response of antibodies against the antigen of surface of the virus producing of the hepatitis B. In students of Medicine 20 years old average, a permanency of antibodies of 168 UI/L was observed, after 3 years of a complete outline of immunization, an increment of 757 UI/L in 14 days post booster, what allowed to study the index by memory / durability that was 5.5 and to know the increment in UI/L per day (54 UI/day) and for antigen micro-gramme: 37.8 UI/µg. It was considered, starting from permanency of antibodies to the 3 years of vaccination, the intensity of the response post schedule that was 336UI/L, equally starting from the values reached in the memory, 925 UI/L, we prognosis a seroprotection up to 18 years or more, that is to say up to the 2023. We obtained preliminary results of use of the kinetic pattern for immune-efficiency study.

The Kinetics of Secondary Response of Antigen-Specific CD4+ T Cells Primed in vitro with Antigen

BACKGROUND: Memory T lymphocytes of the immune system provide long-term protection in response to bacterial or viral infections/immunization. Ag concentration has also been postulated to be important in determining whether T cell differentiation favors effector versus memory cell development. In the present study we hypothesized that na?ve Ag-specific CD4+ T cells briefly stimulated with different Ag doses at the primary exposure could affect establishment of memory cell pool after secondary immunization. METHODS: To assess this hypothesis, the response kinetics of DO11.10 TCR CD4+ T cells primed with different Ag doses in vitro was measured after adoptive transfer to naive BALB/c mice. RESULTS: Maximum expansion was shown in cells primarily stimulated with high doses of ovalbumin peptide (OVA323-339), whereas cells in vitro stimulated with low dose were expanded slightly after in vivo secondary exposure. However, the cells primed with low OVA323-339 peptide dose showed least contraction and established higher number of memory cells than other treated groups. When the cell division was analyzed after adoptive transfer, the high dose Ag-stimulated donor cells have undergone seven rounds of cell division at 3 days post-adoptive transfer. However, there was very few division in naive and low dose of peptide-treated group. CONCLUSION: These results suggest that primary stimulation with a low dose of Ag leads to better memory CD4+ T cell generation after secondary immunization. Therefore, these facts imply that optimally primed CD4+ T cells is necessary to support effective memory pool following administration of booster dose in prime-boost vaccination.