In early brain injury (EBI) after subarachnoid hemorrhage (SAH)

white matter (WM) axonal injury plays a key role in the prognosis of the disease. The purpose of this study was to investigate the effects of phosphatase and tensin homolog deleted on chromosome ten (PTEN) on axonal injury and neuronal apoptosis post-SAH in rats and to find its underlying mechanism. Adeno-associated virus was injected into the lateral ventricle to suppress or promote PTEN. Neural function post-SAH in animals was determined by the modified Garcia score

beam balance

and Rotarod test

and the blood–brain barrier disruption was assessed by the brain water content. Axonal injury post-SAH was observed by TEM and determined by IF

and neuron apoptosis was measured by TUNEL staining. The mechanism was analyzed by Western blot to detect p-PTEN/PTEN

p-AKT/AKT

p-GSK-3β/GSK-3β

p-CRMP-2/CRMP-2

axonal injury marker β-APP and pro- and anti-apoptosis proteins

including Bax and Bcl-2

expression. We found 1. After knocking down PTEN

neuronal apoptosis and axonal injury were alleviated

and nerve function and blood–brain barrier were protected; accordingly

after overexpression of PTEN

neuronal apoptosis and axon damage were aggravated

and nerve function damage and blood–brain barrier damage were increased. 2. PTEN and AKT/GSK-3β/CRMP-2 pathway were jointly involved in regulating neuronal apoptosis and WM axon injury after SAH. According to our research

PTEN was a negative factor of EBI

and together with the AKT/GSK-3β/CRMP-2 signaling pathway aggravates neuronal apoptosis and WM axon damage after SAH. Inhibition of PTEN expression may become a new target for SAH treatment.