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J. Biol. Chem., Vol. 277, Issue 34, 30958-30967, August 23, 2002
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From the Although the cellular functions of
TSC2 and its protein product, tuberin, are not known,
somatic mutations in the TSC2 tumor suppressor gene are
associated with tumor development in lymphangioleiomyomatosis (LAM). We
found that ribosomal protein S6 (S6), which exerts translational control of protein synthesis and is required for cell growth, is
hyperphosphorylated in the smooth muscle-like cell lesions of LAM
patients compared with smooth muscle cells from normal human blood
vessels and trachea. Smooth muscle (SM) cells derived from these
lesions (LAMD-SM) also exhibited S6 hyperphosphorylation, constitutive
activation of p70 S6 kinase (p70S6K), and increased basal DNA
synthesis. In parallel, TSC2
Pulmonary, Allergy, and Critical Care
Division, Department of Medicine and
§§ Department of Cell and Development Biology,
University of Pennsylvania, Philadelphia, Pennsylvania 19104, § University of Texas MD Anderson Cancer Center, Smithville,
Texas 78957, ¶ Division of Pulmonary and Critical Care Medicine,
University of Miami, Miami, Florida 33101,
Department of
Surgery, University of Washington School of Medicine, Seattle,
Washington 98195, ** Department of Biochemistry, Chandler
Medical Center, University of Kentucky, Lexington, Kentucky 40536, and

Genetics Laboratory, Hematology Division,
Brigham and Women's Hospital, Boston, Massachusetts 02115
/
smooth muscle cells (ELT3) and
TSC2
/
epithelial cells (ERC15) also exhibited hyperphosphorylation of S6, constitutive activation of p70S6K, and increased basal DNA
synthesis. Re-introduction of wild type tuberin into LAMD-SM, ELT3, and
ERC15 cells abolished phosphorylation of S6 and significantly inhibited
p70S6K activity and DNA synthesis. Rapamycin, an immunosuppressant, inhibited hyperphosphorylation of S6, p70S6K activation, and DNA synthesis in LAMD-SM cells. Interestingly, the basal levels of phosphatidylinositol 3-kinase, Akt/protein kinase B, and p42/p44 MAPK
activation were unchanged in LAMD-SM and ELT3 cells relative to levels
in normal human tracheal and vascular SM. These data demonstrate that
tuberin negatively regulates the activity of S6 and p70S6K
specifically, and suggest a potential mechanism for abnormal cell
growth in LAM.
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