{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T14:23:10Z","timestamp":1791296590657,"version":"4.1.0"},"reference-count":77,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2018,4,1]],"date-time":"2018-04-01T00:00:00Z","timestamp":1522540800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Transplant recipients developing donor-specific HLA class II (HLA-II) Abs are at higher risk for Ab-mediated rejection (AMR) and transplant vasculopathy. To understand how HLA-II Abs cause AMR and transplant vasculopathy, we determined the signaling events triggered in vascular endothelial cells (EC) following Ab ligation of HLA-II molecules. HLA-II expression in EC was induced by adenoviral vector expression of CIITA or by pretreatment with TNF-\u03b1\/IFN-\u03b3. Ab ligation of class II stimulated EC proliferation and migration. Class II Ab also induced activation of key signaling nodes Src, focal adhesion kinase, PI3K, and ERK that regulated downstream targets of the mammalian target of rapamycin (mTOR) pathway Akt, p70 ribosomal S6 kinase, and S6 ribosomal protein. Pharmacological inhibitors and small interfering RNA showed the protein kinases Src, focal adhesion kinase, PI3K\/Akt, and MEK\/ERK regulate class II Ab-stimulated cell proliferation and migration. Treatment with rapalogs for 2 h did not affect HLA-II Ab-induced phosphorylation of ERK; instead, mTOR complex (mTORC)1 targets were dependent on activation of ERK. Importantly, suppression of mTORC2 for 24 h with rapamycin or everolimus or treatment with mTOR active-site inhibitors enhanced HLA-II Ab-stimulated phosphorylation of ERK. Furthermore, knockdown of Rictor with small interfering RNA caused overactivation of ERK while abolishing phosphorylation of Akt Ser473 induced by class II Ab. These data are different from HLA class I Ab-induced activation of ERK, which is mTORC2-dependent. Our results identify a complex signaling network triggered by HLA-II Ab in EC and indicate that combined ERK and mTORC2 inhibitors may be required to achieve optimal efficacy in controlling HLA-II Ab-mediated AMR.<\/jats:p>","DOI":"10.4049\/jimmunol.1701259","type":"journal-article","created":{"date-parts":[[2018,2,23]],"date-time":"2018-02-23T15:51:52Z","timestamp":1519401112000},"page":"2372-2390","source":"Crossref","is-referenced-by-count":58,"title":["HLA Class II\u2013Triggered Signaling Cascades Cause Endothelial Cell Proliferation and Migration: Relevance to Antibody-Mediated Transplant Rejection"],"prefix":"10.1093","volume":"200","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6620-4274","authenticated-orcid":false,"given":"Yi-Ping","family":"Jin","sequence":"first","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, University of California , Los Angeles, CA 90095"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicole M","family":"Valenzuela","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, University of California , Los Angeles, CA 90095"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7188-7855","authenticated-orcid":false,"given":"Xiaohai","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, University of California , Los Angeles, CA 90095"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enrique","family":"Rozengurt","sequence":"additional","affiliation":[{"name":"Department of Medicine, David Geffen School of Medicine, University of California , Los Angeles, CA 90095"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3524-545X","authenticated-orcid":false,"given":"Elaine F","family":"Reed","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, University of California , Los Angeles, CA 90095"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2018,4,1]]},"reference":[{"key":"2025030610140348700_r1","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1097\/TP.0000000000000869","article-title":"The influence of immunosuppressive agents on the risk of de novo donor-specific HLA antibody production in solid organ transplant recipients","volume":"100","author":"O\u02bcLeary","year":"2016","journal-title":"Transplantation"},{"key":"2025030610140348700_r2","doi-asserted-by":"crossref","first-page":"438","DOI":"10.1111\/j.1600-6143.2004.00360.x","article-title":"Predicting kidney graft failure by HLA antibodies: a prospective trial","volume":"4","author":"Terasaki","year":"2004","journal-title":"Am. 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