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Microvascular dysfunction causes mortality in the presence of sepsis and multi-organ failure. Previous studies have demonstrated that exogenous administration of exosomes from adipose-derived mesenchymal stem cells (ADSCs) protects against sepsis, improves organ function, decreases vascular leakage and increases survival. However, the underlying regulatory mechanism was largely unknown. Therefore, in this study, a mouse sepsis model based on cecal ligation and puncture (CLP) was constructed. Exosomes from various ADSCs were intravenously administered at 4 h post CLP. Treatment with ADSC exosomes (Exo), particularly those with hypoxic pretreatment (HExo), enhanced survival, suppressed renal vascular leakage and decreased kidney dysfunction in septic mice. HExo ameliorated sepsis-induced increases in chemokine and cytokine plasma levels. Furthermore, the HExo circRNA content, determined through next-generation sequencing, revealed abundant mmu_circ_0001295. Further studies demonstrated that downregulation of exosomal mmu_circ_0001295 suppressed the exosomes’ protective effects against sepsis. HExo prevented microvascular dysfunction, thus potentially improving sepsis outcomes via mmu_circ_0001295 delivery. In summary, the data indicated that HExo elongate sepsis-induced renal injury through delivering mmu_circ_0001295.

bioengineered

Circular RNA mmu_circ_0001295 from hypoxia pretreated adipose-derived mesenchymal stem cells (ADSCs) exosomes improves outcomes and inhibits sepsis-induced renal injury in a mouse model of sepsis