Endofacial competitive inhibition of the glucose transporter 1 activity by gossypol
Author
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Pérez, Alejandra
Author
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Ojeda, Paola
Author
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Valenzuela, Ximena
Author
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Ortega, Marcela
Author
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Sánchez, Claudio
Author
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Ojeda, Lorena
Author
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Castro, Maite
Author
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Cárcamo, Juan G.
Author
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Rauch, M. Cecilia
Author
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Concha, Ilona I.
Author
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Rivas, Coralia I.
Author
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Vera, Juan C.
Author
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Reyes, Alejandro M.
Admission date
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2018-12-20T14:12:19Z
Available date
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2018-12-20T14:12:19Z
Publication date
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2009
Cita de ítem
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American Journal of Physiology - Cell Physiology, Volumen 297, Issue 1, 2018,
Identifier
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03636143
Identifier
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15221563
Identifier
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10.1152/ajpcell.00501.2008
Identifier
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https://repositorio.uchile.cl/handle/2250/154725
Abstract
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Gossypol is a natural disesquiterpene that blocks the activity of the mammalian facilitative hexose transporter GLUT1. In human HL-60 cells, which express GLUT1, Chinese hamster ovary cells overexpressing GLUT1, and human erythrocytes, gossypol inhibited hexose transport in a concentration-dependent fashion, indicating that blocking of GLUT1 activity is independent of cellular context. With the exception of red blood cells, the inhibition of cellular transport was instantaneous. Gossypol effect was specific for the GLUT1 transporter since it did not alter the uptake of nicotinamide by human erythrocytes. Gossypol affects the glucose-displaceable binding of cytochalasin B to GLUT1 in human erythrocyte ghost in a mixed noncompetitive way, with a K i value of 20 μM. Likewise, GLUT1 fluorescence was quenched ∼80% by gossypol, while Stern-Volmer plots for quenching by iodide displayed increased slopes by gossypol addition. These effects on protein fluorescence were saturable and unaffected