{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T06:04:04Z","timestamp":1790489044074,"version":"4.1.0"},"reference-count":37,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2003,3,18]],"date-time":"2003-03-18T00:00:00Z","timestamp":1047945600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Glia"],"published-print":{"date-parts":[[2003,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Tuberous sclerosis complex (TSC) is an autosomal dominant syndrome in which affected individuals develop nervous system abnormalities that might reflect astrocyte dysfunction. The <jats:italic>TSC2<\/jats:italic> gene product, tuberin, encodes a GTPase\u2010activating protein (GAP) domain, which regulates the activity of Rap1 in vitro. To determine whether dysregulated Rap1, resulting from <jats:italic>TSC2<\/jats:italic> inactivation, leads to increased astrocyte proliferation in vivo, we generated transgenic mice expressing activated Rap1<jats:sup>G12V<\/jats:sup> specifically in astrocytes. We observed no statistically significant difference in the number of astrocytes between wild\u2010type and GFAP\u2010Rap1<jats:sup>G12V<\/jats:sup> littermates in vivo; however, during log\u2010phase growth, we observed a 25% increase in GFAP\u2010Rap1<jats:sup>G12V<\/jats:sup> astrocyte doubling times compared to wild\u2010type controls. This decreased proliferation was associated with delayed MAP kinase, but not AKT, activation. Lastly, to determine whether constitutive Rap1 activation could reverse the increased astrocyte proliferation observed in transgenic mice expressing oncogenic Ras<jats:sup>G12V<\/jats:sup>, we generated transgenic mice expressing both Ras<jats:sup>G12V<\/jats:sup> and Rap1<jats:sup>G12V<\/jats:sup> in astrocytes. These double transgenic mice showed a striking reversion of the Ras<jats:sup>G12V<\/jats:sup> astrocyte growth phenotype. Collectively, these results argue that the tumor suppressor properties of tuberin are unlikely to be related to Rap1 inactivation and that Rap1 inhibits mitogenic Ras pathway signaling in astrocytes. GLIA 42:225\u2013234, 2003. \u00a9 2003 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/glia.10214","type":"journal-article","created":{"date-parts":[[2003,3,31]],"date-time":"2003-03-31T12:00:12Z","timestamp":1049112012000},"page":"225-234","source":"Crossref","is-referenced-by-count":25,"title":["Role of the Rap1 GTPase in astrocyte growth regulation"],"prefix":"10.1002","volume":"42","author":[{"given":"Anthony J.","family":"Apicelli","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erik J.","family":"Uhlmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca 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