pinocytosis


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pinocytosis

 [pin″o-si-to´sis]
a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm (see accompanying illustration). adj., adj pinocytot´ic.
Mechanism of pinocytosis. Tiny droplets of fluid are trapped by the folds of the plasma membrane and engulfed as fluid-filled vesicles into the cytoplasm.

pin·o·cy·to·sis

(pin'ō-sī-tō'sis, pī'nō-),
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles; it resembles phagocytosis.
[pinocyte + G. -osis, condition]

pinocytosis

/pino·cy·to·sis/ (pi″nah-si-to´sis) a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm.pinocytot´ic
Enlarge picture
Pinocytosis of small fluid droplets.

pin·o·cy·to·sis

(pĭn′ə-sĭ-tō′sĭs, -sī-, pī′nə-)
n.
Introduction of fluids into a cell by invagination of the cell membrane, followed by formation of vesicles within the cells.

pin′o·cy·tot′ic (-tŏt′ĭk) adj.

pinocytosis

[pī′nōsītō′sis]
Etymology: Gk, pinein + kytos + osis, condition
the process by which extracellular fluid is taken into a cell. The plasma membrane develops a saccular indentation filled with extracellular fluid and then pinches off the indentation, forming a vesicle or vacuole of fluid within the cell.

pin·o·cy·to·sis

(pin'ō-sī-tō'sis)
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles; it resembles phagocytosis.
[pinocyte + G. -osis, condition]
Enlarge picture
PINOCYTOSIS AND EXOCYTOSIS: (Top) Pinocytosis; (Bottom) Exocytosis
Enlarge picture
PINOCYTOSIS AND EXOCYTOSIS

pinocytosis

(pin″ŏ-sĭ-tō′sĭs, pīn″, -sī″) [ pinocyte + -osis]
The process by which cells absorb or ingest nutrients and fluid. An invaginating portion of the cell membrane encircles the nutrient, enclosing it in a membrane-bound sac. The contents of the sac are then digested.
See: illustrationillustration

pin·o·cy·to·sis

(pin'ō-sī-tō'sis)
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles.
[pinocyte + G. -osis, condition]

pinocytosis (pī´nōsītō´sis),

pinocytosis

a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm.
Enlarge picture
Mechanism of pinocytosis. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000
References in periodicals archive ?
Under severe inflammatory conditions even native LDL may be taken up by pinocytosis into macrophages and induce CVD.
The contrast medium opens tight capillary connections and passes the blood-brain barrier by increasing endothelial pinocytosis.
Gonzalez-Noriega A, Grubb JH, Talkad V and WS Sly Chloroquine inhibits lysosomal enzyme pinocytosis and enhances lysosomal enzyme secretion by impairing receptor recycling.