Benralizumab: eficacia y seguridad en pacientes con asma grave eosinofílica.



Palabras clave:

benralizumab, asma, eosinófilo, IL-5



El asma grave conlleva una carga de salud desproporcionadamente alta y cerca de la mitad de los adultos con esta patología tiene un fenotipo eosinofílico. En estos pacientes aunado a la producción de eosinófilos en médula ósea, se activan mecanismos de eosinopoyesis local en tejido pulmonar. Benralizumab es un anticuerpo monoclonal humanizado, que se une con alta afinidad y especificidad a la subunidad alfa del receptor de IL-5 (IL-5Rα) sobre la superficie de eosinófilos y otras células. El principal diferenciador de su mecanismo de acción se relaciona con la remoción de un residuo de fucosa en la Fc, lo cual incrementa hasta 50 veces la afinidad a células NK con apoptosis de eosinófilos mediante citotoxicidad celular dependiente de anticuerpos (CCDA), resultando en una reducción rápida y cercana al 100% tanto en suero como en médula ósea. Adicionalmente, benralizumab reduce >90% de los eosinófilos en tejido pulmonar y esputo. En diversos estudios clínicos controlados y en vida real se ha demostrado que esto se traduce en incremento actual del control del asma y disminución del riesgo futuro. El perfil de seguridad es adecuado sin haberse documentado infestaciones parasitarias ni efectos adversos a largo plazo relacionados con la reducción de los eosinófilos.



Severe asthma carries a disproportionately high health burden and about half of adults with this pathology have an eosinophilic phenotype. In these patients, in addition to the production of eosinophils in bone marrow, local eosinopoiesis mechanisms are activated in lung tissue. Benralizumab is a humanized monoclonal antibody, which joins with high affinity and specificity to the alpha subunit of the IL-5 receptor (IL-5Rα) on the surface of eosinophils and other cells. The main differentiator of its mechanism of action is related to the removal of a fucose residue in Fc, which increases up to 50 times the affinity to NK cells with eosinophil apoptosis by antibody-dependent cell cytotoxicity (CCDA), that leads to a direct, rapid and nearly complete depletion in both peripheral blood and bone marrow. Additionally, benralizumab reduces >90% of eosinophils in lung tissue and sputum. Several controlled and real-life clinical studies have shown that this action over eosinophils is related to increased asthma control and decreased future risk. The safety profile is adequate without documenting parasitic infestations or long-term adverse effects related to the reduction of eosinophils.


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