{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T22:04:11Z","timestamp":1790633051011,"version":"4.1.0"},"reference-count":48,"publisher":"Oxford University Press (OUP)","issue":"12","license":[{"start":{"date-parts":[[2014,11,26]],"date-time":"2014-11-26T00:00:00Z","timestamp":1416960000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2014,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Rationale: Cerebral ischemia upregulates aquaporin-4 expression, increases blood-brain barrier (BBB) permeability, and induces brain edema. Mesenchymal stem cells (MSCs) can repress inflammatory cytokines and show great potential for ischemic stroke therapy. However, the effect of MSCs regarding the protection of ischemia-induced BBB break down is unknown. Objective: We test whether MSCs therapy protects BBB integrity and explore the molecular mechanisms of aquaporin-4 on BBB integrity. Methods and Results: Two hundred and twenty-eight adult CD1 male mice underwent 90 minutes transient middle cerebral artery occlusion and received 2 \u00d7 105 MSCs intracranial transplantation. The neurological severity score was improved and both ischemia-induced brain edema and BBB leakage were reduced in MSC-treated mice. MSCs therapy reduced astrocyte apoptosis and inhibited ischemia-induced aquaporin-4 upregulation. In addition, small-interfering RNA knockdown of aquaporin-4 after cerebral ischemia effectively reduced aquaporin-4 expression, brain edema, BBB leakage, and astrocyte apoptosis. Conditional medium from lipopolysaccharide (LPS)-activated microglia enhanced aquaporin-4 expression, p38 and JNK phosphorylation, and apoptosis of cultured astrocytes. MSC treatment reduced the expression of inflammatory cytokines in LPS-activated microglia, and subsequently reduced aquaporin-4 expression and apoptosis of astrocytes. Knockdown of aquaporin-4 in cultured astrocytes also reduced apoptosis. Treatment with p38 and JNK inhibitors showed that p38, but not the JNK signaling pathway, was responsible for the aquaporin-4 upregulation. Conclusion: MSCs protected BBB integrity by reducing the apoptosis of astrocytes after ischemic attack, which was due to the attenuation of inflammatory response and downregulation of aquaporin-4 expression via p38 signaling pathway. Stem Cells \u00a02014;32:3150\u20133162<\/jats:p>","DOI":"10.1002\/stem.1808","type":"journal-article","created":{"date-parts":[[2014,8,7]],"date-time":"2014-08-07T10:15:28Z","timestamp":1407406528000},"page":"3150-3162","source":"Crossref","is-referenced-by-count":136,"title":["Mesenchymal Stem Cells Maintain Blood-Brain Barrier Integrity by Inhibiting Aquaporin-4 Upregulation After Cerebral Ischemia"],"prefix":"10.1093","volume":"32","author":[{"given":"Guanghui","family":"Tang","sequence":"first","affiliation":[{"name":"Neuroscience and Neuroengineering Research Center, Med-X Research Institute and School of Biomedical Engineering Shanghai Jiao Tong University, Shanghai, People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanqun","family":"Liu","sequence":"additional","affiliation":[{"name":"Neuroscience and Neuroengineering Research Center, Med-X Research Institute and School of Biomedical Engineering Shanghai Jiao Tong University, 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