Peanut protein acts as a TH2 adjuvant by inducing RALDH2 in human antigen-presenting cells.
J Allergy Clin Immunol
; 148(1): 182-194.e4, 2021 07.
Article
em En
| MEDLINE
| ID: mdl-33378690
ABSTRACT
BACKGROUND:
Peanut is a potent inducer of proallergenic TH2 responses in susceptible individuals. Antigen-presenting cells (APCs) including dendritic cells and monocytes instruct naive T cells to differentiate into various effector cells, determining immune responses such as allergy and tolerance.OBJECTIVE:
We sought to detect peanut protein (PN)-induced changes in gene expression in human myeloid dendritic cells (mDCs) and monocytes, identify signaling receptors that mediate these changes, and assess how PN-induced genes in mDCs impact their ability to promote T-cell differentiation.METHODS:
mDCs, monocytes, and naive CD4+ T cells were isolated from blood bank donors and peanut-allergic patients. APCs were incubated with PN and other stimulants, and gene expression was measured using microarray and RT quantitative PCR. To assess T-cell differentiation, mDCs were cocultured with naive TH cells.RESULTS:
PN induced a unique gene expression profile in mDCs, including the gene that encodes retinaldehyde dehydrogenase 2 (RALDH2), a rate-limiting enzyme in the retinoic acid (RA)-producing pathway. Stimulation of mDCs with PN also induced a 7-fold increase in the enzymatic activity of RALDH2. Blocking antibodies against Toll-like receptor (TLR)1/TLR2, as well as small interfering RNA targeting TLR1/TLR2, reduced the expression of RALDH2 in PN-stimulated APCs by 70%. Naive TH cells cocultured with PN-stimulated mDCs showed an RA-dependent 4-fold increase in production of IL-5 and expression of integrin α4ß7.CONCLUSIONS:
PN induces RALDH2 in human APCs by signaling through the TLR1/TLR2 heterodimer. This leads to production of RA, which acts on TH cells to induce IL-5 and gut-homing integrin. RALDH2 induction by PN in APCs and RA-promoted TH2 differentiation could be an important factor determining allergic responses to peanut.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arachis
/
Células Th2
/
Retinal Desidrogenase
/
Família Aldeído Desidrogenase 1
/
Células Apresentadoras de Antígenos
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article