Effect of intra-abdominal administration of ligustrazine nanoparticles nano spray on postoperative peritoneal adhesion in rat model

We aimed to evaluate the preventive effect of the ligustrazine nanoparticles nano spray (LNNS) for postoperative peritoneal adhesions in female rat models.Fifty Wistar female rats weighting 250-300 g were randomly assigned to seven equal groups. All animals in the seven groups underwent midline laparotomy and ceca were abraded with sterile rasp. Group 1 underwent sham operations without treatment. In group 2, a postoperative peritoneal adhesion model was created, but no medication was given. In group 3, a postoperative peritoneal adhesion model was treated with LNNS, 2.5 mg/kg. In group 4, a postoperative peritoneal adhesion model was treated with LNNS, 5 mg/kg. In group 5, a postoperative peritoneal adhesion model was treated with LNNS, 10 mg/kg. In group 6, a postoperative peritoneal adhesion model was treated with polylactic acid (PLA) nanoparticle. In group 7, a postoperative peritoneal adhesion model was treated with ligustrazine, 2.5 mg/kg. Ten days after surgery, macroscopic and pathologic assessments were performed, and peritoneal fluid samples were collected in each group. The levels of tumor necrosis factor-α, tissue plasminogen activator and plasminogen activator inhibitor-1 in peritoneal fluid were determined by enzyme-linked immunosorbent assay.The adhesion score and extent of groups 4 and 5 was lower than that of group 2 in macroscopic assessment (P0.05). A comparison of tumor necrosis factor-α and tissue plasminogen activator level in the peritoneal fluid also demonstrated significant differences among groups 2, 4 and 5 (P0.05). The levels of plasminogen activator inhibitor-1 in peritoneal fluid in the LNNS groups were decreased compared to group 1.We suggest that LNNS could reduce peritoneal adhesion formation and it could be applied as a novel intervention for postoperative peritoneal adhesion.