Co-adjuvanting DDA/TDB liposomes with a TLR7 agonist allows for IgG2a/c class-switching in the absence of Th1 cells
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Co-adjuvanting DDA/TDB liposomes with a TLR7 agonist allows for IgG2a/c class-switching in the absence of Th1 cells. / Zimmermann, Julie; van Haren, Simon D.; Arce, Joann; Adriawan, Ignatius Ryan; Wørzner, Katharina; Krog, Ricki T.; Guleed, Safia; Hu, Tu; Mortensen, Rasmus; Dietrich, Jes; Solbak, Sara M.Ø.; Levy, Ofer; Christensen, Dennis; Pedersen, Gabriel K.
In: npj Vaccines, Vol. 8, No. 1, 189, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Co-adjuvanting DDA/TDB liposomes with a TLR7 agonist allows for IgG2a/c class-switching in the absence of Th1 cells
AU - Zimmermann, Julie
AU - van Haren, Simon D.
AU - Arce, Joann
AU - Adriawan, Ignatius Ryan
AU - Wørzner, Katharina
AU - Krog, Ricki T.
AU - Guleed, Safia
AU - Hu, Tu
AU - Mortensen, Rasmus
AU - Dietrich, Jes
AU - Solbak, Sara M.Ø.
AU - Levy, Ofer
AU - Christensen, Dennis
AU - Pedersen, Gabriel K.
N1 - Authoe Correction: https://www.nature.com/articles/s41541-024-00804-4
PY - 2023
Y1 - 2023
N2 - Class-switching to IgG2a/c in mice is a hallmark response to intracellular pathogens. T cells can promote class-switching and the predominant pathway for induction of IgG2a/c antibody responses has been suggested to be via stimulation from Th1 cells. We previously formulated CAF®01 (cationic liposomes containing dimethyldioctadecylammonium bromide (DDA) and Trehalose-6,6-dibehenate (TDB)) with the lipidated TLR7/8 agonist 3M-052 (DDA/TDB/3M-052), which promoted robust Th1 immunity in newborn mice. When testing this adjuvant in adult mice using the recombinant Chlamydia trachomatis (C.t.) vaccine antigen CTH522, it similarly enhanced IgG2a/c responses compared to DDA/TDB, but surprisingly reduced the magnitude of the IFN-γ+Th1 response in a TLR7 agonist dose-dependent manner. Single-cell RNA-sequencing revealed that DDA/TDB/3M-052 liposomes initiated early transcription of class-switch regulating genes directly in pre-germinal center B cells. Mixed bone marrow chimeras further demonstrated that this adjuvant did not require Th1 cells for IgG2a/c switching, but rather facilitated TLR7-dependent T-bet programming directly in B cells. This study underlines that adjuvant-directed IgG2a/c class-switching in vivo can occur in the absence of T-cell help, via direct activation of TLR7 on B cells and positions DDA/TDB/3M-052 as a powerful adjuvant capable of eliciting type I-like immunity in B cells without strong induction of Th1 responses.
AB - Class-switching to IgG2a/c in mice is a hallmark response to intracellular pathogens. T cells can promote class-switching and the predominant pathway for induction of IgG2a/c antibody responses has been suggested to be via stimulation from Th1 cells. We previously formulated CAF®01 (cationic liposomes containing dimethyldioctadecylammonium bromide (DDA) and Trehalose-6,6-dibehenate (TDB)) with the lipidated TLR7/8 agonist 3M-052 (DDA/TDB/3M-052), which promoted robust Th1 immunity in newborn mice. When testing this adjuvant in adult mice using the recombinant Chlamydia trachomatis (C.t.) vaccine antigen CTH522, it similarly enhanced IgG2a/c responses compared to DDA/TDB, but surprisingly reduced the magnitude of the IFN-γ+Th1 response in a TLR7 agonist dose-dependent manner. Single-cell RNA-sequencing revealed that DDA/TDB/3M-052 liposomes initiated early transcription of class-switch regulating genes directly in pre-germinal center B cells. Mixed bone marrow chimeras further demonstrated that this adjuvant did not require Th1 cells for IgG2a/c switching, but rather facilitated TLR7-dependent T-bet programming directly in B cells. This study underlines that adjuvant-directed IgG2a/c class-switching in vivo can occur in the absence of T-cell help, via direct activation of TLR7 on B cells and positions DDA/TDB/3M-052 as a powerful adjuvant capable of eliciting type I-like immunity in B cells without strong induction of Th1 responses.
U2 - 10.1038/s41541-023-00781-0
DO - 10.1038/s41541-023-00781-0
M3 - Journal article
C2 - 38135685
AN - SCOPUS:85180506970
VL - 8
JO - npj Vaccines
JF - npj Vaccines
SN - 2059-0105
IS - 1
M1 - 189
ER -
ID: 378766932