Innate immune and fibrinolytic systems cooperate also during bacterial infections. Innate immune and fibrinolytic systems cooperate also during bacterial infections. (A) Kaplan-Meier curve showing the percentage of WT (n = 6) and IFN-γ–deficient mice (n = 10) undergoing ulceration after S. aureus administration at the indicated time points; log-rank test. Representative data of two independent experiments. (B) Hematoxylin and eosin staining of WT and IFN-γ–deficient mice skin lesions 48 hours after S. aureus infection. PicroSirius Red staining is also shown to evidence collagen depositions. (C) Western blot analysis of SMAD2/3 phosphorylation at the indicated time points after S. aureus infection of WT and IFN-γ–deficient mice. Data were quantified and normalized on β-actin. Data are representative of three independent experiments. (D) Western blot analysis of tPA and PAI-1 levels measured in WT and IFN-γ–deficient animals at the indicated hours after S. aureus infection. William Santus et al. Sci. Immunol. 2017;2:eaan2725 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works