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Although various molecules have been implicated in salivary gland development, the role of the mammalian target of rapamycin (mTOR) signalling pathway, including both mTOR complexes 1 and 2 (mTORC1 and 2), in salivary gland development is unknown. Here, we examined protein expression levels related to the mTOR signalling pathway using an <jats:italic>ex\u00a0vivo<\/jats:italic> submandibular salivary gland (SMG) organ culture. We showed that branching buds in the salivary glands were substantially decreased and phosphorylation of mTORC1 signalling pathway related proteins (mTOR, p70 ribosomal protein S6 kinase 1 and eukaryotic initiation factor 4E\u2010binding protein 1) was inhibited by rapamycin (an mTOR inhibitor). In addition, AKT, which is an upstream protein kinase of mTORC1 and is downstream of mTORC2, is inhibited by LY294002 (a phosphatidylinositol 3\u2010kinase inhibitor), but not by rapamycin. Moreover, rapamycin\u2010treated ICR neonatal mice exhibited a reduction in both body weight and salivary glands compared with vehicle\u2010treated neonatal mice. The present data indicate that the mTOR signalling pathway, including both mTORC1 and mTORC2, plays a critical role in salivary gland development both in <jats:italic>ex\u00a0vivo<\/jats:italic> SMG organ culture and ICR neonatal mice <jats:italic>in\u00a0vivo<\/jats:italic>.<\/jats:p>","DOI":"10.1111\/febs.14937","type":"journal-article","created":{"date-parts":[[2019,5,23]],"date-time":"2019-05-23T09:58:16Z","timestamp":1558605496000},"page":"3701-3717","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Role of the mTOR signalling pathway in salivary gland development"],"prefix":"10.1111","volume":"286","author":[{"given":"Manabu","family":"Sakai","sequence":"first","affiliation":[{"name":"Department of Clinical Laboratory Osaka University Dental Hospital Suita Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Moe","family":"Fukumoto","sequence":"additional","affiliation":[{"name":"Department 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