Neuroprotective Effect of a Prostacyclin Agonist (ONO-1301) with Thromboxane Synthase Inhibitory Activity in Rats Subjected to Cerebral Ischemia — Oak Academic Publishing
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Neuroprotective Effect of a Prostacyclin Agonist (ONO-1301) with Thromboxane Synthase Inhibitory Activity in Rats Subjected to Cerebral Ischemia
ONO-1301 has been developed as a novel long-acting prostacyclin agonist with thromboxane synthase inhibitory activity. In the present study, we investigated the cerebroprotective effect of ONO-1301 on post-ischemic injury induced by cerebral ischemia in rats. ONO-1301 (1 and 10 mg/kg) was administrated orally at reperfusion and then twice a day for 42 days. The cell damage induced by cerebral ischemia in the hippocampal CA1 was evaluated using both Nissl staining and proliferating cell nuclear antigen (PCNA) staining on the 42 days after cerebral ischemia. Activated astrocytes were evaluated using immunofluorescence staining with GFAP on the 42 days after cerebral ischemia. Spatial learning was assessed using a Morris water maze (MWM) task on the 56 days (i.e. after a 14 days washout period). ONO-1301- treated rats (1 and 10 mg/kg) significantly improved cell death in the hippocampal CA1, the number of PCNA-positive cells and astrocyte activation. The spatial learning of ONO-1301-treated rats compared with vehicle- treated rats in the MWM task. These results suggest that repeated treatment with oral ONO-1301 could prevent or limit post-ischemic brain damage. In particular, treatment with ONO-1301 within 7 days after ischemia is most effective to improve ischemic damage.
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