IMMUNOLOGY2026™ Conference Recordings For Attendees-Loss of STAT1 and Nitric Oxide Signaling Compromises the Development of the Stress Erythropoiesis Niche

Loss of STAT1 and Nitric Oxide Signaling Compromises the Development of the Stress Erythropoiesis Niche

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Video Summary

Stress erythropoiesis is an emergency pathway that produces red blood cells when bone marrow is impaired, mainly in the mouse spleen. The talk showed that inflammation drives formation of a stress erythropoiesis niche: interferon gamma/STAT1 promotes recruitment of monocytes, which become erythroblastic island macrophages and support progenitor expansion and differentiation. In contrast, NOS2-derived nitric oxide helps terminate monocyte recruitment and supports macrophage development. STAT1 deficiency reduces inflammatory signaling, monocyte recruitment, and stress erythroid progenitors. NOS2 deficiency causes monocyte accumulation, apoptosis, and poor niche formation. Sickle cell anemia phenocopies NOS2 loss, suggesting defective nitric oxide impairs stress erythropoiesis.

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Date April 16, 2026 5:30 PM - 5:45 PM

Room 104AB

Session Bone Marrow Hematopoiesis

Speaker Aashka Atul Shah

Track Hematopoiesis and Immune System Development (HEM)

Year 2026

Keywords

stress erythropoiesis

interferon gamma STAT1

monocyte recruitment

NOS2 nitric oxide

sickle cell anemia

April 16, 2026 5:30 PM - 5:45 PM

104AB

Bone Marrow Hematopoiesis

Aashka Atul Shah

Hematopoiesis and Immune System Development (HEM)

2026