Carnosic Acid Ameliorates Depressive-Like Symptoms Along With The Modulation Of Fgf9 In The Hippocampus Of Middle Carotid Artery Occlusion-Induced Sprague Dawley Rats

The increased survival rate of stroke patients has led to the higher incidences of post-stroke depression. Carnosic acid has the ability to cross blood brain barrier with good neuro-modulatory actions. Recently, inclined level of fibroblast growth factor 9 (FGF9) in the postmortem brain of the depressed patients was noted. Therefore, in the present study, the effect of carnosic acid on post-stroke depression-like behavior, and the expression of FGF9 were evaluated. After 3 weeks of middle carotid artery occlusion in Sprague Dawley rats, carnosic acid (20 and 40 mg/kg) was administered for 2 weeks. Sucrose preference test, forced swimming test, and open field test were performed and hippocampi were analyzed for FGF9 and FGFR-3. In comparison to post-stroke depressed rats, carnosic acid increased the sucrose preference, and reduced the immobility time of the rats by similar to 2x. The speed and distance-covered were also increased. At 40 mg/kg, FGF9 was reduced by similar to 3x while FGFR-3/Actin was increased by similar to 1.5x. Altogether results suggest anti-depressant-like activity of carnosic acid in post-stroke depressed rats with decreased expression of hippocampal FGF9.