Systemic peptidoglycan (PGN) exposure predisposes to inflammatory arthritis.
Severity of ankle inflammation was assessed in wild-type (WT) and PGLYRP-2
knockout (KO) mice 72 h after systemic PGN or saline exposure. (A)
Representative NIR-images of the ankle. (B) Quantification of NIR-fluorescence
intensity; *p<0.05 comparison with saline controls within a genotype,
**p<0.05 comparison between PGN-treated WT and PGLYRP-2 KO
mice (n=10 mice/treatment/genotype). (C) and (D) are representative
histological images of ankle joints from WT and PGLYRP-2 KO mice, respectively
(H&E stain, original magnification at 200 ×). Arrows indicate
proliferation of synovial membrane that coincides with a minor cellular
infiltrate in the WT mice, which is absent in the PGLYRP-2 KO mice. H&E,
haematoxylin and eosin.