The promotion of cerebral ischemia recovery in rats by laminin-binding BDNF.

Brain-derived neurotrophic factor (BDNF) has been shown to have therapeutic effects on cerebral ischemia. However, the delivery approach limits its application. Laminin is a rich extra cellular matrix in the central nervous system, and is highly expressed in the ischemic region after cerebral ischemia. We reported here by fusing with laminin-binding domain (LBD) to BDNF to construct laminin-binding BDNF (LBD-BDNF). LBD-BDNF could target accumulated laminin in the ischemic region and exert targeting therapy of injured neurons after ischemia. We examined the laminin-binding ability and neurotrophic bioactivity of LBD-BDNF in vitro, and assessed its targeting therapy using a rat permanent middle cerebral artery occlusion (MCAO) model in vivo. It was found that LBD-BDNF could specifically bind to laminin and maintain BDNF activity both in vitro and in vivo. LBD-BDNF treatment attenuated neural-degeneration after MCAO, and also resulted in a reduction of infarct volume that is associated with a parallel improvement in neurological functional outcome and neurogenesis in the dentate gyrus of hippocamp.