A developmentally restricted γδ T cell-IL-17A axis supports mouse heart regeneration.

A transient γδ T cell-IL-17A axis during neonatal development is essential for mouse heart regeneration, with γδ T cells producing IL-17A to promote tissue repair.

• Why it matters: Understanding the immune mechanisms that enable heart regeneration could inform therapies for heart injury in adults, where regenerative capacity is limited. The neonatal immune response is uniquely capable of supporting tissue repair, but the specific immune cells involved are not well understood.
• What they did: The researchers identified a developmentally restricted γδ T cell population that accumulates after cardiac injury during the regenerative window and produces IL-17A. They used genetic ablation and signaling disruption to demonstrate that this axis is critical for proper immune response and heart repair.
• The result: Disruption of γδ T cells or IL-17 signaling impairs regeneration, leading to abnormal immune infiltration and cardiac dysfunction, highlighting a targeted immune pathway that could be harnessed for regenerative therapies.