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Molecular and Cellular Biology, July 2001, p. 4785-4806, Vol. 21, No. 14
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.14.4785-4806.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Insulin-Responsive Compartments Containing GLUT4 in 3T3-L1 and CHO Cells: Regulation by Amino Acid Concentrations

Jonathan S. Bogan,1,2 Adrienne E. McKee,2 and Harvey F. Lodish2,3,*

Diabetes Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114,1 and Whitehead Institute for Biomedical Research2 and Department of Biology, Massachusetts Institute of Technology,3 Cambridge, Massachusetts 02142

Received 22 November 2000/Returned for modification 19 December 2000/Accepted 17 April 2001

In fat and muscle, insulin stimulates glucose uptake by rapidly mobilizing the GLUT4 glucose transporter from a specialized intracellular compartment to the plasma membrane. We describe a method to quantify the relative proportion of GLUT4 at the plasma membrane, using flow cytometry to measure a ratio of fluorescence intensities corresponding to the cell surface and total amounts of a tagged GLUT4 reporter in individual living cells. Using this assay, we demonstrate that both 3T3-L1 and CHO cells contain intracellular compartments from which GLUT4 is rapidly mobilized by insulin and that the initial magnitude and kinetics of redistribution to the plasma membrane are similar in these two cell types when they are cultured identically. Targeting of GLUT4 to a highly insulin-responsive compartment in CHO cells is modulated by culture conditions. In particular, we find that amino acids regulate distribution of GLUT4 to this kinetically defined compartment through a rapamycin-sensitive pathway. Amino acids also modulate the magnitude of insulin-stimulated translocation in 3T3-L1 adipocytes. Our results indicate a novel link between glucose and amino acid metabolism.

* Corresponding author. Mailing address: Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142-1479. Phone: (617) 258-5216. Fax: (617) 258-6768. E-mail: lodish{at}wi.mit.edu.

Molecular and Cellular Biology, July 2001, p. 4785-4806, Vol. 21, No. 14
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.14.4785-4806.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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