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Th9 Cells Drive Host Immunity against Gastrointestinal Worm Infection.

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Interleukin-9 (IL-9) plays a crucial role in type 2 immunity against parasitic worm infections. Our study shows that T helper 9 (Th9) cells are essential for initiating protective responses and clearing infections.

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Area of Science:

  • Immunology
  • Parasitology

Background:

  • Type 2 immunity involves cytokines like IL-4, IL-5, IL-9, and IL-13, crucial for combating parasitic worms and allergens.
  • The specific role of IL-9 and IL-9-producing T cells (Th9) in type 2 immunity remains incompletely understood.
  • Previous research has debated the essentiality of IL-9 in initiating host-protective responses.

Purpose of the Study:

  • To investigate the role of IL-9 and Th9 cells in early type 2 immune responses against parasitic worm infections.
  • To clarify the contribution of IL-9-producing cells versus IL-4-producing cells in type 2 immunity.

Main Methods:

  • Generation of IL-9-deficient and IL-9-fluorescent reporter mice.
  • Infection of mice with Nippostrongylus brasiliensis.
  • Adoptive transfer experiments using Th9 and Th2 cells into Rag2-deficient hosts.
  • Analysis of IL-9 production sources, including Th9 cells and type 2 innate lymphoid cells (ILC2s).

Main Results:

  • IL-9-deficient mice exhibited impaired early type 2 immunity against Nippostrongylus brasiliensis.
  • Th9 cells and ILC2s were identified as major sources of infection-induced IL-9.
  • Adoptive transfer of Th9 cells, but not Th2 cells, led to rapid worm expulsion, basophilia, and increased mast cell numbers in recipient mice.

Conclusions:

  • IL-9 plays a critical and nonredundant role in host-protective type 2 immunity against parasitic worm infections.
  • Th9 cells are essential for initiating effective immune responses and parasite clearance.
  • These findings highlight the specific importance of the IL-9/Th9 axis in anti-parasitic immunity.