Effect of miRs-17/20 on Vasospasm in Subarachnoid Hemorrhage Model of Rats

Aim: To investigate the effects of melatonin and miRNA-17/20 administration on vasospasm and vascular damage on the bacillary artery in the Subarachnoid hemorrhage (SAH) model of rats. Methods: Rats were divided into 6 groups: Sham,SAH,SAH+NegmiRNA,SAH+MEL,SAH-miRs-17/20 group,SAH+MEL+miRs-17/20.For creating the SAH model the skin was cut with a vertical incision in the anterior region of the head.120 µL of fresh non-heparinized autologous arterial blood collected from the tail artery was injected into the prechiasmatic cistern under aseptic conditions. All steps in the Sham were the same as in the SAH group, except for blood injection. In the SAH+NegmiRs-17/20, miRs-17/20 miRNA Mimic-Negative Control#1 was administered 1 hour after SAH operation. In the SAH+MEL,10 mg/kg melatonin was administered intraperitoneally 1 hour after the SAH operation. In the SAH-miRs-17/20,mimic-miR-17 and mimic-miR-20 were given intranasally 1 hour after the SAH operation.In the SAH+MEL+miRs-17/20,intranasal mimic-miR-17 and intraperitoneal melatonin were administered 1 hour after the SAH operation. Brain samples, including the bacillary artery, were taken and subjected to routine tissue processing procedures. Vessel samples were evaluated and graded in histological sections stained with the H-E method in terms of vasospasm, edema in the tunica media, and folding of the lamina elastica interna. Results: The co-administration of melatonin and miRs-17/20 reduced the vasospasm and edema formation in the vessel wall. It has also been demonstrated that the application of miRs-17/20 after SAH alone reduces the development of edema in the vessel wall and folding of the internasal lamina elastica due to vasospasm. Conclusion:It has been shown that miRs-17/20 can reduce vasospasm in the vessel wall and prevent vessel damage by reducing edema.