Abstract
Several synthetic metalloporphyrins, as well as hemin, stimulate hemoglobin synthesis in isolated nuclei from erythrocytes. The effect of a metalloporphyrin appears to be related principally to the character of the metal component. Hematoporphyrins complexed with transition metals of the fourth period tend to be stimulatory while porphyrins complexed with either smaller or larger metals have no effect or are inhibitory. Evidence is presented that the synthetic metalloporphyrins probably act at the same site as the natural porphyrin, heme.
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