Dynamic CD4+ T cell heterogeneity defines subset-specific suppression and PD-L1-blockade-driven functional restoration in chronic infection.
Nat Immunol
; 22(12): 1524-1537, 2021 12.
Article
de En
| MEDLINE
| ID: mdl-34795443
ABSTRACT
Inhibiting PD-1PD-L1 signaling has transformed therapeutic immune restoration. CD4+ T cells sustain immunity in chronic infections and cancer, yet little is known about how PD-1 signaling modulates CD4+ helper T (TH) cell responses or the ability to restore CD4+ TH-mediated immunity by checkpoint blockade. We demonstrate that PD-1PD-L1 specifically suppressed CD4+ TH1 cell amplification, prevents CD4+ TH1 cytokine production and abolishes CD4+ cytotoxic killing capacity during chronic infection in mice. Inhibiting PD-L1 rapidly restored these functions, while simultaneously amplifying and activating TH1-like T regulatory cells, demonstrating a system-wide CD4-TH1 recalibration. This effect coincided with decreased T cell antigen receptor signaling, and re-directed type I interferon (IFN) signaling networks towards dominant IFN-γ-mediated responses. Mechanistically, PD-L1 blockade specifically targeted defined populations with pre-established, but actively suppressed proliferative potential, with limited impact on minimally cycling TCF-1+ follicular helper T cells, despite high PD-1 expression. Thus, CD4+ T cells require unique differentiation and functional states to be targets of PD-L1-directed suppression and therapeutic restoration.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Activation des lymphocytes
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Lymphocytes auxiliaires Th1
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Antigène CD274
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Inhibiteurs de points de contrôle immunitaires
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Chorioméningite lymphocytaire
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Virus de la chorioméningite lymphocytaire
Limites:
Animals
Langue:
En
Journal:
Nat Immunol
Sujet du journal:
ALERGIA E IMUNOLOGIA
Année:
2021
Type de document:
Article
Pays d'affiliation:
Canada