Objective:To evaluate catheter directed thrombolysis in the treatment of early acute superior mesenteric artery embolization.Methods:The clinical data of 19 cases of acute superior mesenteric artery embolization treated with catheter directed thrombolysis therapy in the First Affiliated Hospital of Shandong First Medical University from Aug 2015 to Jul 2020 was retrospectively analyzed.Results:Fifteen cases were treated successfully with catheter directed thrombolysis , the blood flow and intestinal function restored significantly. The condition of 4 patients worsened during catheter directed thrombolysis therapy. Among them, three cases of intestinal necrosis were later confirmed by exploratory laparotomy and they recovered well after enterectomy. One elderly patient unsuitable for laparotomy died.Conclusion:Catheter directed thrombolysis is effective in the treatment of acute superior mesenteric artery embolization in early stage without intestinal necrosis.

Accelerated forgetting has been identified as a feature of Alzheimer's disease (AD), but the therapeutic efficacy of the manipulation of biological mechanisms of forgetting has not been assessed in AD animal models. Ras-related C3 botulinum toxin substrate 1 (Rac1), a small GTPase, has been shown to regulate active forgetting in Drosophila and mice. Here, we showed that Rac1 activity is aberrantly elevated in the hippocampal tissues of AD patients and AD animal models. Moreover, amyloid-beta 42 could induce Rac1 activation in cultured cells. The elevation of Rac1 activity not only accelerated 6-hour spatial memory decay in 3-month-old APP/PS1 mice, but also significantly contributed to severe memory loss in aged APP/PS1 mice. A similar age-dependent Rac1 activity-based memory loss was also observed in an AD fly model. Moreover, inhibition of Rac1 activity could ameliorate cognitive defects and synaptic plasticity in AD animal models. Finally, two novel compounds, identified through behavioral screening of a randomly selected pool of brain permeable small molecules for their positive effect in rescuing memory loss in both fly and mouse models, were found to be capable of inhibiting Rac1 activity. Thus, multiple lines of evidence corroborate in supporting the idea that inhibition of Rac1 activity is effective for treating AD-related memory loss.