Scientists discover a hidden immune signal that helps spinal cords regrow

A surprising immune system signal may help explain why zebrafish can regenerate damaged spinal cords so effectively. Researchers found that certain neutrophils release Il-4, which calms harmful inflammation and allows injured nerve fibers to grow again. Without these cells, healing stalled, but adding Il-4 restored regeneration [1].

Sources

1. sciencedaily.com · Scientists discover a hidden immune signal that helps spinal cords regrow Sep 8, 2026

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