{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T09:20:35Z","timestamp":1790760035362,"version":"4.1.0"},"reference-count":75,"publisher":"Portland Press Ltd.","issue":"10","license":[{"start":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T00:00:00Z","timestamp":1588118400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2020,5,29]]},"abstract":"<jats:p>The mammalian target of rapamycin (mTOR) is an evolutionarily conserved Ser\/Thr kinase that comprises two complexes, termed mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). mTORC1 phosphorylates S6K1 at Thr 389, whereas mTORC2 phosphorylates AKT at Ser 473 to promote cell growth. As the mTOR name implies it is the target of natural product called rapamycin, a clinically approved drug used to treat human disease. Short-term rapamycin treatment inhibits the kinase activity of mTORC1 but not mTORC2. However, the ATP-competitive catalytic mTOR inhibitor Torin1 was identified to inhibit the kinase activity of both mTORC1 and mTORC2. Here, we report that H89 (N-(2-(4-bromocinnamylamino) ethyl)-5-isoquinolinesulfonamide), a well-characterized ATP-mimetic kinase inhibitor, renders the phosphorylation of S6K1 and AKT resistant to mTOR inhibitors across multiple cell lines. Moreover, H89 prevented the dephosphorylation of AKT and S6K1 under nutrient depleted conditions. PKA and other known H89-targeted kinases do not alter the phosphorylation status of S6K1 and AKT. Pharmacological inhibition of some phosphatases also enhanced S6K1 and AKT phosphorylation. These findings suggest a new target for H89 by which it sustains the phosphorylation status of S6K1 and AKT, resulting in mTOR signaling.<\/jats:p>","DOI":"10.1042\/bcj20190958","type":"journal-article","created":{"date-parts":[[2020,4,29]],"date-time":"2020-04-29T11:48:48Z","timestamp":1588160928000},"page":"1847-1863","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Small molecule H89 renders the phosphorylation of S6K1 and AKT resistant to mTOR inhibitors"],"prefix":"10.1042","volume":"477","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3977-9886","authenticated-orcid":false,"given":"Chase H.","family":"Melick","sequence":"first","affiliation":[{"name":"Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"},{"name":"Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"},{"name":"Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8021-9453","authenticated-orcid":false,"given":"Jenna L.","family":"Jewell","sequence":"additional","affiliation":[{"name":"Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"},{"name":"Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"},{"name":"Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, U.S.A"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","published-online":{"date-parts":[[2020,5,28]]},"reference":[{"key":"2021112218090069400_BCJ-2019-0958C1","doi-asserted-by":"publisher","first-page":"721","DOI":"10.7164\/antibiotics.28.721","article-title":"Rapamycin (AY-22,989), a new antifungal antibiotic. I. Taxonomy of the producing streptomycete and isolation of the active principle","volume":"28","year":"1975","journal-title":"J. Antibiot (Tokyo)"},{"key":"2021112218090069400_BCJ-2019-0958C2","doi-asserted-by":"publisher","first-page":"48","DOI":"10.1139\/y77-007","article-title":"Inhibition of the immune response by rapamycin, a new antifungal antibiotic","volume":"55","year":"1977","journal-title":"Can. J. Physiol. 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