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Iron-deficient erythropoiesis in neonatal rats
Suzanne H Dubuque1, Bohuslav Dvorak, Suann S Woodward
1Department of Pediatrics, Steele Memorial Children's Research Center, University of Arizona Health Sciences Center, Tucson, AZ 85724-5073, USA.
Insights
Developing an animal model for infant anemia is crucial. Neonatal rats treated with recombinant human erythropoietin (rhEPO) and iron showed improved iron status, aiding anemia research.
Area of Science:
- Neonatology
- Hematology
- Animal Models
Background:
- Anemia is common in premature infants, complicating treatment monitoring.
- Traditional iron status indices are often unreliable in this population.
- Accurate assessment of iron delivery to red blood cells is clinically important.
Purpose of the Study:
- To develop an experimental animal model for quantifying iron delivery to erythrocytes.
- To address clinical challenges in monitoring anemia therapy in premature infants.
- To investigate iron metabolism during erythropoiesis in a neonatal setting.
Main Methods:
- Established normal hematological values in Sprague-Dawley rats during the first 12 postnatal days (PND).
- Administered parenteral recombinant human erythropoietin (rhEPO) with or without oral iron supplementation to rat pups.
- Included control groups receiving oral iron only or sham feeding.
- Measured hematological parameters in blood and bone marrow.
Main Results:
- Neonatal rat hematological markers showed dynamic changes, mirroring premature infants.
- rhEPO administration increased red blood cell and reticulocyte counts.
- Iron deficiency was evident in rhEPO-treated rats without iron supplementation, indicated by lower hemoglobin, lower mean red cell volume, and higher zinc protoporphyrin/heme ratio.
Conclusions:
- The neonatal rat serves as an effective model for studying iron-deficient erythropoiesis.
- This model is valuable for future mechanistic studies on iron and erythropoiesis interplay in anemic neonates.
- It aids in understanding and potentially improving anemia treatment strategies in premature infants.
Abstract:
Anemia in premature infants is extremely common. Precise quantitation of iron status and determination of iron incorporation into erythrocytes are important in monitoring therapy for anemia in premature infants, especially when treating with recombinant human erythropoietin (rhEPO). However, the traditional indices of the iron status have limited usefulness in this population. The goal of the current work is to develop an experimental animal model system that addresses the clinical issue relating to quantitation of iron delivery to erythrocytes. We first determined normal hematological values for nontreated, dam-suckled Sprague-Dawley rats by measuring markers of erythropoiesis and iron status during the first 12 postnatal days (PND). The experimental group of rats were administered parenteral rhEpo (430 IU.kg(-1). day(-1)) for 8 days (from PND 4 until PND 12) in the absence (rhEpo(-Fe)) or presence (rhEpo(+Fe)) of oral iron supplementation (6 mg.kg(-1).day(-1)). Rat pups receiving oral iron only (control(+Fe)) and pups that were sham fed with the orogastric tube (control(-Fe)) were included as controls. Hematological parameters were measured in blood and bone marrow. In a pattern similar to that seen in premature infants during the first 2 months of life, the levels of these hematopoietic markers were dynamic and changed during the first 12 PND. After challenging experimental animals with subcutaneous rhEpo, evidence of iron-deficient erythropoiesis was seen in the rhEpo(-Fe) group. Red blood cell levels and absolute reticulocyte counts were higher in both groups receiving rhEpo as compared with the controls. However, the rhEpo(-Fe) group experienced a lower hemoglobin level, a lower mean red cell volume, a greater red cell distribution width, and a higher zinc protoporphyrin/heme (ratio than the rhEpo(+Fe) group. The neonatal rat is an excellent model of iron-deficient erythropoiesis and will be useful in designing future mechanistic studies examining the interplay between iron and erythropoiesis in the anemic, iron-challenged premature neonate.