Alveolar Macrophage-Expressed Plet1 Is a Driver of Lung Epithelial Repair After Viral Pneumonia

Investigators revealed that placenta-expressed transcript 1 (Plet1) was released from alveolar macrophages, and acted as important mediator of macrophage-epithelial cross-talk during lung repair by inducing proliferation of alveolar epithelial cells and re-sealing of the epithelial barrier.