Development of T Follicular Helper Cell-independent Nanoparticle Vaccines for SARS-CoV-2 or HIV-1 by Targeting ICOSL
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T helper cells, particularly T follicular helper (T) cells, are essential for the neutralizing antibody production elicited by pathogens or vaccines. However, in immunocompromised individuals, the inefficient support from T cells could lead to limited protection after vaccine inoculation. Here we showed that the conjugation of inducible T cell costimulatory (ICOS) onto the nanoparticle, together with immunogen, significantly enhanced the immune response of the vaccines specific for SARS-CoV-2 or human immunodeficiency virus type-1 (HIV-1) in T-deficient mice. Further studies indicated that ICOSL on B cells was triggered by ICOS binding, subsequently activated the PKCβ signaling pathway, and enhanced the survival and proliferation of B cells. Our findings revealed that the stimulation of ICOS-ICOSL interaction by adding ICOS on the nanoparticle vaccine significantly substitutes the function of T cells to support B cell response, which is significant for the immunocompromised people, such as the elderly or HIV-1-infected individuals.
Mallardo D, Fordellone M, Ottaviano M, Marano G, Vitale M, Mallardo M Int J Mol Sci. 2024; 25(22).
PMID: 39596506 PMC: 11594639. DOI: 10.3390/ijms252212439.