| Autor: |
Wilkins, Sarah J., Frazer, David M., Millard, Kirstin N., McLaren, Gordon D., Anderson, Gregory J. |
| Zdroj: |
Blood; February 2006, Vol. 107 Issue: 4 p1659-1664, 6p |
| Abstrakt: |
The iron requirements of the erythroid compartment modulate the expression of hepcidin in the liver, which in turn alters intestinal iron absorption and iron release from the reticuloendothelial system. We have taken advantage of an inherited anemia of the mouse (hemoglobin deficit, or hbd) to gain insights into the factors regulating hepcidin expression. hbdmice showed a significant anemia but, surprisingly, their iron absorption was not increased as it was in wild-type animals made anemic to a similar degree by dietary iron depletion. In wild-type mice hepatic hepcidin levels were decreased but in hbdanimals a significant and unexpected increase was observed. The level of absorption was appropriate for the expression of hepcidin in each case, but in hbdmice did not reflect the degree of anemia. However, this apparent inappropriate regulation of hepcidin correlated with increased transferrin saturation and levels of diferric transferrin in the plasma, which in turn resulted from the reduced capacity of hbdanimals to effectively use transferrin-bound iron. These data strengthen the proposal that diferric transferrin is a key indicator of body iron requirements. |
| Databáze: |
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