Research Article| Volume 63, ISSUE 1, P122-136, January 1964

Extravascular destruction of acetylphenylhydrazine-damaged erythrocytes in the rat

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      Following a single subcutaneous dose of acetylphenylhydrazine (APH) to rats, the entire erythrocyte population was removed by the reticuloendothelial system (RES), primarily liver and spleen, at a relatively slow rate by largely extravascular mechanisms with only a modest fall in hematocrit. In this process, erythrocytes were removed at an increasingly accelerated rate from the blood, suggesting progressive oxidative damage to the erythrocytes. This category of hemolytic process has not been described previously in animals or man with a drug induced hemolysis. The spleen was the most important organ of sequestration and a more sensitive trap for the damaged erythrocytes than the liver. After labeling the erythrocytes, splenic Fe59 and Cr51 reflected the removal of APH damaged erythrocytes from the blood. The maximum accumulation of Fe59 and Cr51 in the spleen occurred earlier after a large dose of APH than after a small dose. However, maximum spleen weights were reached at the same time with both large and small doses. These facts suggested that splenic hypertrophy was caused by several factors, one of which was erythrocyte phagocytosis. Chromium-51 from erythrocytes was avidly retained by the liver and spleen and was lost from treated rats at no greater rate than from untreated controls for 9 days after APH. Two different doses of APH, producing entirely different rates of extravascular destruction, resulted in the same loss of Cr51 from the rats. Reutilization of Fe59 from damaged erythrocytes was not prevented by iron loading, and Fe59 from such cells egressed from the spleen faster than from the liver. Old rat erythrocytes containing Fe59 were removed from the blood and sequestered in spleen and liver to a greater extent than young erythrocytes 4 days after APH.
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