Developmental IL7/IL7R signaling in fetal resident tissue macrophages regulates adaptive responses to liver injury

Prenatal IL7/IL7R signaling is required for fetal liver macrophage survival and proliferation, and IL7R blockade irreversibly impairs postnatal adaptive responses to chronic fibrotic injury.

• Why it matters: How fetal niche signals program resident tissue macrophages during the prenatal window is unclear, limiting understanding of how early programming shapes adult immunity and injury responses.
• What they did: The study tested IL7 or IL7R deficiency and Cre-mediated IL7R deletion in fetal definitive HSC-derived versus EMP-derived macrophages, then assessed fetal liver myeloid pathways and adult chronic fibrotic liver injury outcomes.
• The result: IL7 deficiency impaired neonatal RTM establishment, IL7R deletion increased fetal liver macrophage apoptosis and reduced precursor proliferation, and prenatal IL7R blockade increased monocyte infiltration with pro-inflammatory pathway upregulation during adult injury.

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