[HTML][HTML] IL-17 and VEGF are necessary for efficient corneal nerve regeneration

Z Li, AR Burns, L Han, RE Rumbaut… - The American journal of …, 2011 - Elsevier
Z Li, AR Burns, L Han, RE Rumbaut, CW Smith
The American journal of pathology, 2011Elsevier
The contribution of acute inflammation to sensory nerve regeneration was investigated in the
murine cornea using a model of corneal abrasion that removes the stratified epithelium and
subbasal nerve plexus. Abrasion induced accumulation of IL-17+ CCR6+ γδ T cells,
neutrophils, and platelets in the cornea followed by full restoration of the epithelium and∼
19% regeneration of sensory nerves within 96 hours. Mice deficient in γδ T cells (TCRδ−/−)
or wild-type mice treated systemically with anti-IL-17 had> 50% reduction in leukocyte and …
The contribution of acute inflammation to sensory nerve regeneration was investigated in the murine cornea using a model of corneal abrasion that removes the stratified epithelium and subbasal nerve plexus. Abrasion induced accumulation of IL-17+ CCR6+ γδ T cells, neutrophils, and platelets in the cornea followed by full restoration of the epithelium and ∼19% regeneration of sensory nerves within 96 hours. Mice deficient in γδ T cells (TCRδ−/−) or wild-type mice treated systemically with anti-IL-17 had >50% reduction in leukocyte and platelet infiltration and >50% reduction in nerve regeneration. Strategies used to prevent neutrophil and platelet accumulation (eg, wild-type mice treated with anti-Ly6G or anti-GP1bα antibody to deplete neutrophils or platelets) also resulted in >50% reductions in corneal nerve density. Infiltrating neutrophils and platelets stained positively for VEGF-A, tissue levels of VEGF-A peaked coincidentally with peak tissue levels of neutrophils and platelets, depletion of neutrophils before injury reduced tissue VEGF-A levels by >70%, and wild-type mice treated systemically with anti-VEGF-A antibody exhibited >80% reduction in corneal nerve regeneration. Given the known trophic effects of VEGF-A for neurite growth, the results in this report demonstrate a previously unrecognized beneficial role for the γδ T cell–dependent inflammatory cascade involving IL-17, neutrophils, platelets, and VEGF-A in corneal nerve regeneration.
Elsevier