KLF2 overrides the resident memory CD8 T cell differentiation program, in opposition to KLF3

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• T cell differentiation into recirculating or tissue-resident memory subsets is regulated by transcriptional factors.
• The hierarchical or coordinated roles of these factors in controlling T cell trafficking remain unclear.

Purpose of the Study:

• To investigate the role of Kruppel-like factor 2 (KLF2) and KLF3 in CD8+ T cell differentiation and trafficking.
• To determine if KLF2 plays a dominant role in directing T cell fate towards recirculation or residency.

Main Methods:

• Gene ablation of KLF2 and KLF3 in CD8+ T cells during activation.
• Analysis of transcriptional reprogramming, phenotypic characteristics, and T_RM acquisition.
• Assessment of recall responses and in vivo pathogen control in KLF-deficient T cells.

Main Results:

• KLF2 ablation caused effector T cells to fail recirculation and prematurely adopt T_RM characteristics.
• KLF2-deficient memory T cells maintained recall responses and pathogen control.
• KLF3 ablation influenced recirculating T cell subsets and T_RM production.
• Both KLF2 and KLF3 were essential for long-lived effector cell differentiation, indicating cooperation.

Conclusions:

• KLF2 acts as a key regulator, diverting CD8+ T cells from the T_RM differentiation pathway.
• KLFs are central regulators coordinating CD8+ T cell differentiation and trafficking.
• KLF2 and KLF3 exhibit distinct yet cooperative roles in T cell fate determination.