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IRON METABOLISM IN EXPERIMENTAL ANEMIA : "AVAILABILITY OF IRON"
1Department of Pathology, The University of Rochester School of Medicine and Dentistry, Rochester, N. Y.
The Journal of Experimental Medicine
|October 30, 2009
Summary
The dipyridyl test for "available iron" lacks physiological significance in canine anemia. Iron salts, though highly available by dipyridyl standards, show significantly lower physiological availability for hemoglobin regeneration.
Area of Science:
- Hematology
- Biochemistry
- Veterinary Medicine
Background:
- The dipyridyl test is commonly used to assess iron availability.
- Understanding iron's physiological availability is crucial for treating anemia.
- Factors influencing iron absorption and utilization remain complex.
Purpose of the Study:
- To evaluate the physiological significance of the dipyridyl test for "available iron" in experimental canine anemia.
- To determine the actual physiological availability of iron salts compared to dipyridyl test results.
- To explore other factors influencing hemoglobin regeneration beyond simple iron availability.
Main Methods:
- Inducing experimental anemia in dogs through blood loss.
- Administering iron salts and assessing hemoglobin production.
- Comparing hemoglobin regeneration from iron salts with dipyridyl test "availability" ratings.
- Analyzing tissue fractions (liver, heart, spleen, kidney) for iron content and hemoglobin regeneration potential.
Main Results:
- The dipyridyl test's "available iron" measure showed no direct physiological significance in anemic dogs.
- Iron salts rated 100% available by dipyridyl test were only 35% physiologically available for hemoglobin regeneration.
- Optimal iron salt dosage (560 mg/2 weeks) yielded 50-55 gm hemoglobin increase above baseline.
- Organic factors in liver and other tissues significantly contribute to hemoglobin regeneration, independent of high iron content.
- Copper levels were not found to be a significant factor in experimental canine anemia or human anemias.
Conclusions:
- The dipyridyl test is an unreliable indicator of iron's physiological availability for treating anemia.
- Hemoglobin regeneration is influenced by complex interactions of iron with organic factors, not just iron content.
- Copper intake is unlikely to be a significant factor in experimental canine anemia or human anemias.
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