Klf4 protects thymus integrity during late pregnancy

Area of Science:

• Immunology
• Developmental Biology
• Molecular Biology

Background:

• Pregnancy induces rapid thymic atrophy, characterized by thymocyte depletion and altered thymic epithelial cells (TECs).
• Progesterone-driven functional changes in cortical TECs (cTECs) are implicated in pregnancy-related thymic involution, which is reversible post-partum.

Purpose of the Study:

• To investigate the role of KLF4 (Kruppel-like factor 4) in regulating TEC function and thymic involution during pregnancy.
• To elucidate the mechanisms by which KLF4 influences TEC survival and plasticity.

Main Methods:

• Generation of a mouse model with TEC-specific KLF4 deletion (Psmb11-iCre : Klf4).
• Analysis of thymic cellularity, TEC subsets, and thymocyte populations under steady-state and late pregnancy conditions.
• Transcriptomic and phenotypic analyses of KLF4-deficient TECs.

Main Results:

• TEC-specific KLF4 deletion minimally affected thymic architecture under steady-state conditions.
• KLF4 deficiency significantly exacerbated pregnancy-induced thymic involution, leading to pronounced TEC ablation and thymocyte loss.
• KLF4 was found to maintain cTEC numbers by promoting cell survival and inhibiting epithelial-to-mesenchymal plasticity during late pregnancy.

Conclusions:

• KLF4 is essential for preserving thymic epithelial cell integrity during pregnancy.
• KLF4 plays a critical role in mitigating thymic involution associated with late pregnancy.