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Am J Physiol Renal Physiol (July 23, 2008). doi:10.1152/ajprenal.90216.2008
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Submitted on March 27, 2008
Revised on July 8, 2008
Accepted on July 18, 2008

Role of the kidney in iron homeostasis: renal expression of Prohepcidin, Ferroportin and DMT1 in anemic mice

Tania Vanesa Veuthey1, María Cecilia DAnna1, and Marta Elena Roque1*

1 Universidad Nacional del Sur

* To whom correspondence should be addressed. E-mail: mroque{at}uns.edu.ar.

It is known that renal tissue plays a role in normal iron homeostasis. The current study examines kidney function in iron metabolism under hemolytic anemia studying renal expression of Prohepcidin, Ferroportin (MTP1) and Divalent Metal Transporter 1 (DMT1). The relationship between these proteins and iron pigments was also investigated. Immunohistochemical procedures to study renal expression of Prohepcidin, MTP1 and DMT1 were performed in healthy and anemic mice. Renal tissular iron was determined by Prussian blue iron staining. To assess anemia evolution and erythropoietic recovery we used conventional tests. In healthy mice Prohepcidin expression was marked in proximal tubules and inner medulla and absent in outer medulla. Cortical tissue of healthy mice also showed MTP1 immunostaining, mainly in the S2 segment of proximal tubules. Medullar tissue showed MTP1 expression in the inner zone. In addition, S2 segments showed intense DMT1 immunoreactivity with homogeneous DMT1 distribution throughout renal medulla. The main cortical findings in hemolytic anemia were in S2 segments of proximal tubules where we found that decreased Prohepcidin expression coincided with an increment in Ferroportin and DMT1 expression. This expression pattern was concomitant with increased iron in the same tubular zone. However, in medullar tissue both Prohepcidin and MTP1 decreased and DMT1 was detected mainly in larger diameter tubules. Our findings clearly demonstrate that in hemolytic anemia, renal Prohepcidin acts in coordination with renal Ferroportin and DMT1, indicating the key involvement of kidney in iron homeostasis when iron demand is high. Further research is required to learn more about these regulatory mechanisms.







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