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      Endocytosis: A Property of the Glomerular Visceral Epithelial Cell

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          Abstract

          The sequential intravenous injections of protamine and heparin into rats results in the deposition of protamine-heparin aggregates along the lamina rara externa of the glomerular basement membrane. Morphologic studies indicate that these foreign aggregates are removed from the glomerular basement membrane by virtue of phagocytic activity by the glomerular visceral epithelial cells. We have studied the disappearance rate of protamine-heparin aggregates from the glomerular basement membrane in animals given a single dose of these compounds and in animals receiving chronic administration. The disappearance rate was measured utilizing a computerized morphometric technique to determine the numerical density of protamine-heparin aggregates per 100 µm glomerular basement membrane in sequential biopsy specimens taken from 15 to 600 min post-injection. The disappearance rate described a linear function in both acute and chronic animals, with a half-disappearance time of approximately 120 min. Disappearance of the aggregates appeared to be due to epithelial cell phagocytosis. This model provides a method of studying this function in the intact glomerulus in both normal and disease states.

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          Author and article information

          Journal
          NEF
          Nephron
          10.1159/issn.1660-8151
          Nephron
          S. Karger AG
          978-3-8055-2981-5
          978-3-318-02025-0
          1660-8151
          2235-3186
          1978
          1978
          02 December 2008
          : 22
          : 1-3
          : 91-96
          Affiliations
          Rush-Presbyterian-St. Luke’s Medical Center, Chicago, Ill.
          Article
          181427 Nephron 1978;22:91–96
          10.1159/000181427
          745642
          © 1978 S. Karger AG, Basel

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          Page count
          Pages: 6
          Categories
          Original Paper

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