title: Hydrogen sulfide attenuates brain edema in early brain injury after subarachnoid hemorrhage in rats: Possible involvement of MMP-9 induced blood-brain barrier disruption and AQP4 expression.
abstract: This study investigated the effect of H2S on brain edema formation and the possible underlying mechanisms in early brain injury (EBI) of SAH using the endovascular perforation model.
  
  
  
  96 male rats were randomly divided into four groups: sham group, SAH+vehicle group, SAH+low-dosage NaHS group, and SAH+high-dosage NaHS group. Brain samples were used for brain water content and blood-brain barrier (BBB) leakage measurement, gelatin zymography, Western blot and immunohistochemistry.
  
  
  
  H2S markedly attenuated brain edema formation and apoptotic cell death, improved neurological dysfunction in the acute stage of SAH. The possible mechanisms of H2S's effect on brain edema formation were through preventing BBB disruption and reducing APQ4 expression on astrocytes. In detail, H2S prevented BBB disruption by inhibiting MMP-9 induced tight junction proteins (TJPs) degradation. H2S down-regulated AQP4 expression on astrocytes by suppressing glial cell activation and pro-inflammatory cytokines secretion.
  
  
  
  Taken together, this study showed that H2S attenuated brain edema formation partially by inhibiting the degradation of TJPs via reducing MMP-9 expression/activity and suppressing AQP4 expression via alleviating glia activation and pro-inflammatory cytokines secretion.
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Shenglong
authors.initials: S
authors.lastname: Cao
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhu
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Yu
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Jingyin
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Jianru
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Yan
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yu
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China. Electronic address: d-chengao@zju.edu.cn.
authors.forename: Gao
authors.initials: G
authors.lastname: Chen
mesh_terms: D000818:Animals; D017209:Apoptosis; D051401:Aquaporin 4 / Q000378:metabolism*; D001253:Astrocytes / Q000378:metabolism / Q000473:pathology; D001812:Blood-Brain Barrier / Q000378:metabolism*; D001921:Brain / Q000378:metabolism* / Q000473:pathology; D001929:Brain Edema / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D016207:Cytokines / Q000378:metabolism; D064426:Gasotransmitters / Q000378:metabolism*; D006862:Hydrogen Sulfide / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D010539:Permeability; D051381:Rats; D013345:Subarachnoid Hemorrhage / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D013440:Sulfides / Q000494:pharmacology; D062725:Tight Junction Proteins / Q000378:metabolism
chemical_list: C496032:Aqp4 protein, rat; D051401:Aquaporin 4; D016207:Cytokines; D064426:Gasotransmitters; D013440:Sulfides; D062725:Tight Junction Proteins; D020780:Matrix Metalloproteinase 9; C025451:sodium bisulfide; D006862:Hydrogen Sulfide
keywords: AQP4; Blood-brain barrier; Brain edema; Hydrogen sulfide; Subarachnoid hemorrhage