IL-17 signaling induces iNOS+ microglia activation in retinal vascular diseases
Activation of microglia and inflammation-mediated vascular damages are suggested to play a decisive role in the pathogenesis of various retinopathies. The inducible nitric oxide synthase (iNOS) was required for activated microglia-mediated injuries. However, the induction mechanism of microglia activation during retinal vascular diseases is still elusive. Here we showed that IL-17 induced microglia activation with high expression of iNOS and promoted the development of retinal vascular diseases. IL-17-dependent activation of the STAT3-iNOS pathway was essentially required for microglia activation, which promoted endothelial cell growth and accelerated vascular leakage and leukostasis via IL-6 in vitro and in vivo. Taken together, our data provide novel mechanistic insights on microglia activation-mediated retinopathy, unveil the specific role of IL-17 on microglia, and define novel therapeutic targets for treating retinal vascular diseases.
Zhou, T., Liu, Y., Yang, Z., Ni, B., Zhu, X., Huang, Z., Xu, H., Feng, Q., Lin, X., He, C., & Liu, X. (2021). IL-17 signaling induces iNOS+ microglia activation in retinal vascular diseases. GLIA, 69 (11), 2644-2657. https://doi.org/10.1002/glia.24063