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Vaccines

Adjuvants Enhance Vaccine Responses in Neonates: Study

Strategic Insights

— 2 min read

Researchers at the National University Hospital of Iceland have conducted a study to understand the effects of adjuvants on vaccine responses in neonates. The findings, published in Frontiers in Immunology, reveal that adjuvants can enhance the immune system's response to vaccines in newborns. This is crucial because neonates have a distinct immune system that makes them more susceptible to infections and poor responders to vaccination.

In the study, the researchers assessed the effects of five different adjuvants on the expression of survival factors in the bone marrow of neonatal mice. They found that adjuvants enhanced the expression of APRIL, a survival factor important for plasma cell maintenance, and reduced the expression of IL-6, which is involved in the regulation of immune responses. Furthermore, the researchers discovered that adjuvants increased the proportion of plasmablasts and plasma cells that expressed BCMA, a receptor involved in the maintenance of plasma cells and antibodies.

The study also found that the effects of adjuvants on the immune system varied depending on the type of adjuvant used. The researchers suggested that triggering low APRIL expression in the bone marrow and low BCMA expression in plasmablasts/plasma cells could be a strategy to induce persistent humoral immune responses in neonates.

Key Takeaways:

  • Adjuvants can enhance the immune system's response to vaccines in neonates.
  • Adjuvants increase the expression of APRIL, a survival factor important for plasma cell maintenance.
  • Adjuvants decrease the expression of IL-6, which is involved in the regulation of immune responses.
  • The effects of adjuvants on the immune system vary depending on the type of adjuvant used.
  • Triggering low APRIL expression in the bone marrow and low BCMA expression in plasmablasts/plasma cells could be a strategy to induce persistent humoral immune responses in neonates.
  • The study suggests that adjuvants, such as LT-K63, mmCT, MF59, IC31, and alum, can be used to enhance vaccine-specific humoral responses in neonates.

Statistics:

  • 5 different adjuvants were tested in the study: LT-K63, mmCT, MF59, IC31, and alum.
  • Adjuvants enhanced APRIL expression in the bone marrow of neonatal mice.
  • Adjuvants reduced IL-6 expression in the bone marrow of neonatal mice.
  • The proportion of plasmablasts and plasma cells that expressed BCMA increased following adjuvant immunization.
  • Enhanced BCMA expression correlated with enhanced vaccine-specific humoral responses.

Sources:

  • A comparative study of adjuvants effects on neonatal plasma cell survival niche in bone marrow and persistence of humoral immune responses. Frontiers in Immunology, 2022,13.
  • Frontiers in Immunology - http://journal.frontiersin.org/journal/immunology
  • The publisher for Frontiers in Immunology is Frontiers Media S.A.
  • A free version of this journal article is available at https://doi-org.sdpl.idm.oclc.org/10.3389/fimmu.2022.904415

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