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Basic Sciences

Sodium Dependency of Uptake of Norepinephrine and m-Iodobenzylguanidine into Cultured Human Pheochromocytoma Cells: Evidence for Uptake-One

Sandford Jaques Jr., Michael C. Tobes and James C. Sisson
Sandford Jaques
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Michael C. Tobes
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James C. Sisson
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DOI:  Published August 1987
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Abstract

Radioiodinated m-iodobenzylguanidine (MIBG), a scintigraphic agent used in the detection of human pheochromocytomas, is thought to utilize the same uptake and retention mechanism(s) as norepinephrine (NE). Using primary cultures from 16 human pheochromocytomas, we compared the uptake of MIBG to that of NE. Two different uptake systems were identified. Both NE and MIBG were taken up by a sodium-dependent system that was characterized by: (a) temperature dependency, (b) high affinity, (c) low capacity, (d) saturability, (e) ouabain sensitivity, and (f) desmethylimipramine sensitivity. However, NE and MIBG were also taken up by a temperature-dependent, sodium-independent, apparently unsaturable system. The sodium-dependent uptake system fulfills many of the criteria for Uptake-one while the sodium-independent uptake system is most likely a passive diffusion process. Competitive inhibition studies demonstrated that NE and MIBG share a common uptake system; a concept consistent with the linear correlation between the rate of uptake of 1.0 µm NE and that of 1.0 µm MIBG (r = 0.942). At low concentrations, both NE and MIBG entered the tumor cells primarily by the sodium-dependent uptake system. Differential expression of the sodium-dependent and sodium-independent uptake systems, between different tumor cells, appears to be responsible for the variations of the kinetic parameters for both NE and MIBG. These studies provide the first direct characterization of a NE uptake mechanism in human pheochromocytoma cells.

Footnotes

  • ↵1 This investigation was supported by American Cancer Society Grant PDT-182, and by USPHS, NIH, National Institute of Arthritis, Metabolism and Digestive Diseases Grant AM-21477.

  • ↵2 To whom requests for reprints should be addressed.

  • Received April 17, 1986.
  • Revision received April 22, 1987.
  • Accepted May 4, 1987.
  • ©1987 American Association for Cancer Research.
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August 1987
Volume 47, Issue 15
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Sodium Dependency of Uptake of Norepinephrine and m-Iodobenzylguanidine into Cultured Human Pheochromocytoma Cells: Evidence for Uptake-One
Sandford Jaques Jr., Michael C. Tobes and James C. Sisson
Cancer Res August 1 1987 (47) (15) 3920-3928;

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Sodium Dependency of Uptake of Norepinephrine and m-Iodobenzylguanidine into Cultured Human Pheochromocytoma Cells: Evidence for Uptake-One
Sandford Jaques Jr., Michael C. Tobes and James C. Sisson
Cancer Res August 1 1987 (47) (15) 3920-3928;
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