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The mTOR Signaling Network: Insights from Its Role During Embryonic Development

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Target of Rapamycin (TOR) signaling, originally discovered as the pathway affected by an antifungal macrolide, exemplifies the potential of medicinal chemistry as a discovery tool. Three decades from its identification, signaling involving the TOR kinase has evolved into a complex network with a crucial role in vertebrate growth control. Specifically, it integrates signals to coordinate cell growth (i.e., enhanced mass and size) and cell cycle progression with sufficiency of nutrients, energy, and growth factors. In this review, we discuss multiple aspects of TOR signaling, including cellular regulators and mediators, human diseases related to TOR dysregulation such as cancer, and signaling nodes in the pathway amenable to targeted drug inhibition. The functions and mechanisms of TOR during embryonic development highlight the dynamic role of TOR signaling and reveal additional functions beyond cell growth control. Embryonic TOR signaling has differential tissue-specific and temporal effects, and is involved in organogenesis, sexual differentiation, and epithelial-to-mesenchymal transition signaling. Molecular mechanisms that may contribute to embryonic-specific TOR functions are also examined here. Finally, this review discusses the complex signaling of mTOR in cancer and the development of mTOR inhibitors for cancer therapy.

Keywords: cancer; development; mTOR; regulation; signaling

Document Type: Research Article


Affiliations: Department of Radiation Oncology,Vanderbilt University, 1301 22nd Avenue South, B-902 The Vanderbilt Clinic, Nashville,Tennessee 37232-5671, USA.

Publication date: May 1, 2008

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.

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