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Gastric aspiration lung injury is one of the most common clinical events.This study investigated the effects of bone-marrow-derived mesenchymal stem cells(BMSCs)on combined acid plus small non-acidified particle(CASP)-induced aspiration lung injury.Enhanced green fluorescent protein(EGFP+)or EGFP_BMSCs or 15d-PGJ2 were injected via the tail vein into rats immediately after CASP-induced aspiration lung injury.