Abstract
The divalent metal ion transporter DMT1 is localized in the brush border membrane (BBM) of the upper small intestine and has been shown to be able to transport Mn2+, Fe2+, Co2+, Ni2+, and Cu2+. Belgrade rats have a glycine-to-arginine (G185R) mutation in DMT1, which affects its function. We investigated copper transport with BBM vesicles of Belgrade rats loaded with calcein, which exhibits fluorescence quenching by various metal ions. Transport of copper was disrupted in unenergized BBM vesicle of b/b Belgrade rats, as had been described for iron transport, while +/b vesicles exhibited normal transport by DMT1. When either b/b or +/b vesicles were loaded with ATP and magnesium, similar high-affinity accumulation of copper was observed in both types of vesicles. Thus, brush border membranes possess an ATP-driven, high-affinity copper transport system which could serve as the primary route for copper uptake by the intestine. © 2005 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 645-652 |
| Number of pages | 7 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 330 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 13 May 2005 |
Keywords
- ATPase
- Belgrade rat
- Brush border membrane
- Calcein fluorescence
- Copper transport
- Duodenum
- Intestine