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Attenuation of Early Brain Injury and Learning Deficits Following Experimental Subarachnoid Hemorrhage Secondary to Cystatin C: Possible Involvement of the Autophagy Pathway
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Attenuation of Early Brain Injury and Learning Deficits Following Experimental Subarachnoid Hemorrhage Secondary to Cystatin C: Possible Involvement of the Autophagy Pathway
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Journal Article
Attenuation of Early Brain Injury and Learning Deficits Following Experimental Subarachnoid Hemorrhage Secondary to Cystatin C: Possible Involvement of the Autophagy Pathway
2014
Overview
Cystatin C (CysC) is a cysteine protease inhibitor and previous studies have demonstrated that increasing endogenous CysC expression has therapeutic implications on brain ischemia, Alzheimer’s disease, and other neurodegenerative disorders. Our previous reports have demonstrated that the autophagy pathway was activated in the brain after experimental subarachnoid hemorrhage (SAH), and it may play a beneficial role in early brain injury (EBI). This study investigated the effects of exogenous CysC on EBI, cognitive dysfunction, and the autophagy pathway following experimental SAH. All SAH animals were subjected to injections of 0.3 ml fresh arterial, nonheparinized blood into the prechiasmatic cistern in 20 s. As a result, treatment with CysC with low and medial concentrations significantly ameliorated the degree of EBI when compared with vehicle-treated SAH rats. Microtubule-associated protein light chain-3 (LC3), a biomarker of autophagosomes, and beclin-1, a Bcl-2-interacting protein required for autophagy, were significantly increased in the cortex 48 h after SAH and were further up-regulated after CysC therapy. By ultrastructural observation, there was a marked increase in autophagosomes and autolysosomes in neurons of CysC-treated rats. Learning deficits induced by SAH were markedly alleviated after CysC treatment with medial doses. In conclusion, pre-SAH CysC administration may attenuate EBI and neurobehavioral dysfunction in this SAH model, possibly through activating autophagy pathway.
Publisher
Springer US,Springer Nature B.V
Subject
/ Animals
/ Biomedical and Life Sciences
/ Brain Injuries - prevention & control
/ Cystatin C - therapeutic use
/ Ischemia
/ Learning Disabilities - metabolism
/ Learning Disabilities - pathology
/ Learning Disabilities - prevention & control
/ Male
/ Rats
/ Signal Transduction - drug effects
/ Signal Transduction - physiology
/ Subarachnoid Hemorrhage - drug therapy
