The synthetic metalloporphyrin, Cr-protoporphyrin, as a potent competitive inhibitor of heme oxygenase activity in rat spleen, liver, and kidney. When administered to neonatal animals in a single dose immediately after birth, Cr-protoporphyrin suppresses postnatal hyperbilirubinemia and produces a marked and sustained lowering of heme oxidation activity in liver, spleen, and kidney. The metalloporphyrin also potently inhibited the rate of heme degradation to bile pigment in human spleen.
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