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Reperfusion of ischemic organs induces a potent inflammatory response initiated by the generation of reactive oxygen species that directly damage tissue and promote leukocyte infiltration and activation that also mediate tissue injury. We recently found that radiation-induced tissue injury, which is caused by radiation-induced reactive oxygen species, is attenuated by administration of CBLB502, a pharmacologically optimized derivative of the TLR5 agonist flagellin. Therefore, we tested the ability of CBLB502 to attenuate injury in a murine model of acute ischemic renal failure. CBLB502 given 30 min before imposition of bilateral renal pedicle occlusion provided marked protection against the renal dysfunction and inflammation that follows reperfusion of ischemic kidneys, including marked decreases in leukocyte infiltration, proinflammatory cytokine production, and tubular injury. Importantly, CBLB502 given within 30 min after ischemic kidney reperfusion reproduced the protective effects of pretreatment with the TLR5 agonist, indicating a window following reperfusion in which CBLB502 administration abrogates acute renal ischemic failure. Bone marrow-reconstituted chimeras were used to show that the protective effects of CBLB502 could be delivered by intact MyD88 signaling on renal parenchymal cells. Consistent with this, Ab staining of kidney sections indicated that cells lining the renal vasculature expressed TLR5. Overall, these results indicate the use of TLR5 agonists as mitigators and protectants of acute renal ischemic failure.

A TLR5 Agonist Inhibits Acute Renal Ischemic Failure