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Updated: May 22, 2026

Evaluation of Amino Acid Consumption in Cultured Bone Cells and Isolated Bone Shafts
Published on: April 13, 2022
Glutamine stimulates mTORC1 independent of the cell content of essential amino acids
Martina Chiu1, Saverio Tardito, Amelia Barilli
1Unit of General and Clinical Pathology, Department of Experimental Medicine, University of Parma, Via Volturno 39, 43125, Parma, Italy.
Abstract:
Glutamine and leucine are important mTORC1 modulators, although their roles are not precisely defined. In HepG2 and HeLa cells glutamine-free incubation lowers mTORC1 activity, although cell leucine is not decreased. mTORC1 activity, suppressed by amino acid-free incubation, is completely rescued only if essential amino acids (EAA) and glutamine are simultaneously restored, although cell leucine is higher in the absence than in the presence of glutamine. Thus, glutamine stimulates mTORC1 independent of cell leucine, suggesting the existence of two distinct stimulatory signals from either glutamine or EAA.
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