Short communicationSubcutaneous daidzein administration enhances recovery of skilled ladder rung walking performance following stroke in rats

- We utilized the skilled ladder rung walking task as a behavioral measure.
- We tested whether subcutaneous daidzein administration enhanced post-stroke recovery.
- Treatment began at the time of stroke.
- Rats treated with daidzein recovered better than rats treated with vehicle alone.

Stroke is a devastating event which can result in permanent disability. Due to the lack of treatments available for use after stroke, compounds which work to limit cell loss, reduce behavioral deficits, and enhance recovery of function are needed. The isoflavone daidzein has been demonstrated to be neuroprotective when fed to rats beginning prior to stroke. Herein, we tested whether subcutaneous delivery of daidzein beginning at the time of stroke reduced injury and/or enhanced functional recovery over 14 days after stroke. Baseline performance on the skilled ladder rung walking task was recorded immediately before stroke (Day 0). Rats then underwent a unilateral permanent middle cerebral artery occlusion and received a subcutaneous minipump containing either daidzein dissolved in vehicle or vehicle alone. Performance on the skilled ladder rung walking task was recorded again on Day +3, Day +7, and Day +14 post-stroke. Rats were then euthanized and brains were collected for lesion volume analysis. The numbers of slight and deep forelimb slips on the task were recorded for 3 trials for each rat per day. Rats treated with daidzein exhibited fewer deep slips over the course of the experiment than rats which received only vehicle (p < 0.05). No difference was detected in total forelimb slips or slight slips (p > 0.05). Lesion volume was not different between groups (p > 0.05). No differences were found in weight between groups during the study (p > 0.05).