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Until recently, hemoglobin was believed to be the only heme protein affected by dietary iron deficiency (1). Several studies, however, have shown that myoglobin, the cytochromes, and catalase may be significantly reduced in concentration in experimental animals and in man (2-9). In the iron-deficient rat, the susceptibility to depletion of heme protein has been found to vary from tissue to tissue. Cytochrome c (7, 9) and myoglobin (9) can be decreased to less than half of control concentrations in skeletal muscle, which normally accounts for over 75% of the total body content of these heme proteins. A similarly marked decrease in concentration of cytochrome c has been noted in intestinal mucosa (9). Other tissues such as brain, heart muscle, liver, and kidney are affected to a lesser degree or are entirely spared (7, 9). In the present investigation, the rate of repair of heme protein deficiency in the rat was studied in the most severely depleted tissues during the course of iron repletion.

Myoglobin and cytochrome response during repair of iron deficiency in the rat.