December 8, 2025BloodOpen Access

A TLR4-HSP70 efferocytic program in thymic macrophages sustains thymic homeostasis and T cell output

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Discussion

Analysis shows TLR4 signaling enhances thymic cellularity following hematopoietic cell transplantation, suggesting potential for immune recovery.

Increased thymic cellularity observed after TLR4 stimulation, promoting T cell output and survival.
Activation of macrophages via HSP70 leads to enhanced efferocytosis of apoptotic cells, crucial for homeostasis.
Mechanistic insights reveal TLR4's role in regulating transcription and lysosomal function in thymic macrophages.
Benefits of targeting TLR4 signaling indicate promise for improving outcomes in patients undergoing hematopoietic cell transplantation.

Lemarquis et al. (2025) studied this question.

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Analysis shows TLR4 signaling enhances thymic cellularity following hematopoietic cell transplantation, suggesting potential for immune recovery.