Medical Definition of Pinosome

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Pinosome: A tiny fluid-filled vesicle (bubble) within a cell.

Pinosomes are created in the process of pinocytosis in which tiny incuppings called caveolae (little caves) in the surface of the cell close and then pinch off to form pinosomes within the cytoplasm of the cell.

Pinocytosis permits the active transport of fluid through the membrane surrounding the cell into the interior of the cell.

The word "pinosome" stemmed from Greek roots: pinein, to drink + soma, body = a drinking body.

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Reviewed on 10/30/2018

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