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The calcium-binding protein complex S100A8/A9 has a crucial role in controlling macrophage-mediated renal repair following ischemia/reperfusion. | LitMetric

AI Article Synopsis

Article Abstract

Upon ischemia/reperfusion (I/R)-induced injury, several damage-associated molecular patterns are expressed including the calcium-binding protein S100A8/A9 complex. S100A8/A9 can be recognized by Toll-like receptor-4 and its activation is known to deleteriously contribute to renal I/R-induced injury. To further test this, wild-type and S100A9 knockout mice (deficient for S100A8/A9 complex) were subjected to renal I/R. The expression of S100A8/A9 was significantly increased 1 day after I/R and was co-localized with Ly6G (mouse neutrophil marker)-positive cells. These knockout mice displayed similar renal dysfunction and damage and neutrophil influx compared with wild-type mice at this early time point. Interestingly, S100A9 knockout mice displayed altered tissue repair 5 and 10 days post I/R, as reflected by increased renal damage, sustained inflammation, induction of fibrosis, and increased expression of collagens. This coincided with enhanced expression of alternatively activated macrophage (M2) markers, while the expression of classically activated macrophage (M1) markers was comparable. Similarly, S100A9 deficiency affected M2, but not M1 macrophage polarization in vitro. During the repair phase following acute kidney injury, S100A9 deficiency affects M2 macrophages in mice leading to renal fibrosis and damage. Thus, S100A8/A9 plays a crucial part in controlling macrophage-mediated renal repair following I/R.

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Source
http://dx.doi.org/10.1038/ki.2014.216DOI Listing

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