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. 1967 Oct 31;126(5):941–958. doi: 10.1084/jem.126.5.941

THE UPTAKE AND DIGESTION OF IODINATED HUMAN SERUM ALBUMIN BY MACROPHAGES IN VITRO

Barbara A Ehrenreich 1, Zanvil A Cohn 1
PMCID: PMC2138411  PMID: 6062005

Abstract

Mouse peritoneal macrophages take up I*-HSA from their medium during in vitro cultivation. Conditions which promote I*-HSA uptake are the same as those which stimulate formation of pinocytic vesicles. Autoradiography of cells pulsed with 125I-HSA showed that intracellular isotope is localized in perinuclear granules, or secondary lysosomes. Following a pulse of 125I-HSA, intracellular radioactivity decreases and the amount of TCA-soluble isotope in the medium increases correspondingly. About 50% of the intracellular isotope is lost in 5 hr. The release of isotope from pulsed cells is not inhibited by parafluorophenylalanine, 2,4-dinitrophenol or by a reduction of the serum concentration of the medium. However, the processing of ingested 125I-HSA is reversibly inhibited by reduced temperature. The TCA-soluble radioactive material excreted by pulsed macrophages was identified as monoiodotyrosine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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