Single amino-acid changes that confer constitutive activation of mTOR are discovered in human cancer.

Abstract:

:Mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates a variety of cellular functions such as growth, proliferation and autophagy. In a variety of cancer cells, overactivation of mTOR has been reported. In addition, mTOR inhibitors, such as rapamycin and its derivatives, are being evaluated in clinical trials as anticancer drugs. However, no active mutants of mTOR have been identified in human cancer. Here, we report that two different point mutations, S2215Y and R2505P, identified in human cancer genome database confer constitutive activation of mTOR signaling even under nutrient starvation conditions. S2215Y was identified in large intestine adenocarcinoma whereas R2505P was identified in renal cell carcinoma. mTOR complex 1 prepared from cells expressing the mutant mTOR after nutrient starvation still retains the activity to phosphorylate 4E-BP1 in vitro. The cells expressing the mTOR mutant show increased percentage of S-phase cells and exhibit resistance to cell size decrease by amino-acid starvation. The activated mutants are still sensitive to rapamycin. However, they show increased resistance to 1-butanol. Our study points to the idea that mTOR activating mutations can be identified in a wide range of human cancer.

journal_name

Oncogene

journal_title

Oncogene

authors

Sato T,Nakashima A,Guo L,Coffman K,Tamanoi F

doi

10.1038/onc.2010.28

subject

Has Abstract

pub_date

2010-05-06 00:00:00

pages

2746-52

issue

18

eissn

0950-9232

issn

1476-5594

pii

onc201028

journal_volume

29

pub_type

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