Influenza Vaccines Stimulate Maturation of the Human T Follicular Helper Cell Response

Strategic Insights -

Researchers have published a new report on the effects of influenza vaccination on human T follicular helper cells (TFH cells), which play a crucial role in the immune response to the flu. The study, conducted over two years, involved administering two influenza vaccines one year apart to human volunteers and analyzing the changes in TFH cells in their blood and lymph nodes.

The research revealed that the first vaccination induced an increase in circulating TFH (cTFH) and lymph node TFH cells, which was transient for cTFH cells but persisted for at least three months in lymph node TFH cells. The study also identified several subsets of TFH cells, including pre-TFH cells, memory TFH cells, germinal center (GC) TFH cells, and interleukin-10+ TFH cell subsets, which began to appear at baseline and at all time points post-vaccination. The shift towards a GC TFH cell phenotype occurred faster after the second vaccine compared to the first vaccine. Moreover, the researchers identified several influenza-specific TFH cell clonal lineages, targeting internal influenza virus proteins.

The study concludes that human TFH cells form a durable and dynamic multitissue network. The research has been peer-reviewed and published in Nature Immunology. The study's findings could have significant implications for the development of more effective influenza vaccines and our understanding of the immune response to the flu virus.

Key Takeaways:

  • The first influenza vaccination induced an increase in circulating TFH (cTFH) and lymph node TFH cells, which was transient for cTFH cells but persisted for at least three months in lymph node TFH cells.
  • The study identified several subsets of TFH cells, including pre-TFH cells, memory TFH cells, germinal center (GC) TFH cells, and interleukin-10+ TFH cell subsets.
  • The shift towards a GC TFH cell phenotype occurred faster after the second vaccine compared to the first vaccine.
  • The researchers identified several influenza-specific TFH cell clonal lineages, targeting internal influenza virus proteins.
  • Human TFH cells form a durable and dynamic multitissue network.

Statistics:

  • The study was conducted over two years.
  • The researchers analyzed samples from human volunteers who received two influenza vaccines one year apart.
  • The increase in circulating TFH (cTFH) cells was transient, while lymph node TFH cells persisted for at least three months.
  • The study identified several subsets of TFH cells, including 4 distinct subsets.
  • The shift towards a GC TFH cell phenotype occurred faster after the second vaccine compared to the first vaccine (approximately 2 weeks faster).

Sources:

  • Influenza Vaccination Stimulates Maturation of the Human T Follicular Helper Cell Response. Nature Immunology, 2024.
  • NewsRx. Investigators from St. Jude Children's Research Hospital Release New Data on Influenza Vaccines (Influenza Vaccination Stimulates Maturation of the Human T Follicular Helper Cell Response). Vaccine Weekly. September 18, 2024; p 2365.