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Previous work confirmed the involvement of the immunoproteasome subunit of low molecular mass peptide 2 (LMP2) in the pathophysiology of ischemia stroke. However, the relationship between the immunoproteasome LMP2 and the BBB remains unclear.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Adult male Sprague\u2013Dawley rats were subjected to transient middle cerebral artery occlusion\/reperfusion (MCAO\/R). Three days before MCAO, the rats were treated with lentivirus-mediated LMP2 shRNA preparations by stereotactical injection into the ipsilateral hemispheric region. The rat brain microvascular endothelial cell (RBMVEC) line was exposed to oxygen\u2013glucose deprivation\/reperfusion (OGD\/R) to mimic ischemic conditions in vitro. The RNA interference-mediated knockdown of LMP2 or \u03b2-catenin was analysed in vivo and in vitro. Analysis of the quantity of extravasated Evans blue (EB) and cerebral fluorescent angiography were performed to evaluate the integrity of the BBB. Immunofluorescence and Western blotting were employed to detect the expression of target proteins. Cell migration was evaluated using a scratch migration assay. The results of immunofluorescence, Western blotting and cell migration were quantified using the software ImageJ (Version 1.53m). Parametric data from different groups were compared using one-way ANOVA followed by the least significant difference (LSD) test.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Cerebral ischemia led to lower levels of structural components of the BBB such as tight junction proteins (occludin, claudin-1 and ZO-1) in the MCAO\/R group compared with the sham group (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001). However, inhibition of the immunoproteasome LMP2 restored the expression of these proteins, resulting in higher levels of occludin, claudin-1 and ZO-1 in the LMP2-shRNA group compared with the control-shRNA group (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001). In addition, inhibition of the immunoproteasome LMP2 contributed to higher microvascular density and decreased BBB permeability [e.g., the quantity of extravasated EB: LMP2-shRNA group (58.54\u2009\u00b1\u20097.37) \u00b5g\/g\n                      <jats:italic>vs.<\/jats:italic>\n                      control-shRNA group (103.74\u2009\u00b1\u20094.32) \u00b5g\/g,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001], and promoted the upregulation of Wnt-3a and \u03b2-catenin proteins in rats following MCAO\/R. In vitro experiments, OGD\/R induced marked upregulation of LMP2, proapoptotic protein Bax and cleaved caspase-3, and downregulation of occludin, claudin-1, ZO-1 and Bcl-2, as well as inhibition of the Wnt\/\u03b2-catenin pathway Wnt-3a and \u03b2-catenin proteins in RBMVECs, compared with the control group under normal culture conditions (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001). However, silencing of LMP2 gene expression reversed these protein changes and promoted proliferation and migration of RBMVECs following OGD\/R. Silencing of \u03b2-catenin by transfection of RBMVECs with \u03b2-catenin-siRNA aggravated the downregulation of tight junction proteins, and reduced the proliferation and migration of RBMVECs following OGD\/R, compared with the control-siRNA group (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001). LMP2-siRNA and \u03b2-catenin-siRNA co-transfection partly counteracted the beneficial effects of silencing LMP2-siRNA on the levels of tight junction proteins in RBMVECs exposed to OGD\/R.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This study suggests that inhibition of the immunoproteasome LMP2 ameliorates ischemia\/hypoxia-induced BBB injury, and that the molecular mechanism involves the immunoproteasome-regulated activation of the Wnt\/\u03b2-catenin signalling pathway under ischemic conditions.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s40779-021-00356-x","type":"journal-article","created":{"date-parts":[[2021,12,2]],"date-time":"2021-12-02T19:03:47Z","timestamp":1638471827000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":53,"title":["Inhibition of the immunoproteasome LMP2 ameliorates ischemia\/hypoxia-induced blood\u2013brain barrier injury through the Wnt\/\u03b2-catenin signalling pathway"],"prefix":"10.1016","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7364-5414","authenticated-orcid":false,"given":"Xing-Yong","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shao-Fen","family":"Wan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nan-Nan","family":"Yao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ze-Jing","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan-Guang","family":"Mao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao-Hua","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yin-Zhou","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","published-online":{"date-parts":[[2021,12,3]]},"reference":[{"key":"356_CR1","doi-asserted-by":"publisher","first-page":"144","DOI":"10.1016\/j.pneurobio.2017.10.001","volume":"163\u2013164","author":"X Jiang","year":"2018","unstructured":"Jiang X, Andjelkovic AV, Zhu L, Yang T, Bennett M, Chen J, et al. 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