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

(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.

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

pinocytosis

The process in which cells engulf fluid to form tiny clear spherical containers (vacuoles) which then move through the cell cytoplasm, sometimes acting as scavenging vehicles to be discarded through another part of the cell membrane. Extracellular fluid with dissolved molecules may be moved intracellularly by pinocytosis.

pinocytosis

or

micropinocytosis

(‘cell-drinking’) the active engulfing of very small particles or liquids by cells; a form of ENDOCYTOSIS. The particles become surrounded by the cell membrane on all sides, which eventually forms a channel from which vesicles are pinched off and move within the PROTOPLASM before their contents can be transferred into the cell proper.

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]
References in periodicals archive ?
Pinocytosis in the developing egg of Limnaea stagnalis.
While traveling through those regions, many of the PLG spheres are swallowed by cells in a process called pinocytosis. As the biopolymer slowly degrades, the encapsulated plasmids are released into the cell's fluid interior.
In pirarucu, the latter function is most likely performed in the S3 region, where absorption vacuoles were often observed in the apical cytoplasm of enterocytes, which can be indicative of protein absorption by pinocytosis (Ezeasor & Stokoe, 1981; Carrasson et al.).
Since the conjunctival blood vessels do not form a tight junction barrier, bevacizumab can enter into the blood circulation by pinocytosis and/or convective transport through paracellular pores in the vascular endothelial layer.
The peptides were internalized via pinocytosis by the macrophages and were not effective against nonpinocytotic fibroblasts, presumably because they could not access IFNGR1 cytoplasmic domain.
Sodium-DNA passes through the cell membrane by pinocytosis and acts as a donor of purine and pyrimidine bases, which are key molecules for cell vitality.
Pt nps were shown to be taken up by cells via mainly pinocytosis [62, 67, 68].
The CNS also has limited lymphatic drainage and dendritic cells, which are star-shaped cells that are constantly sampling their environment by pinocytosis. It was originally thought that the CNS was devoid of dendritic cells and perhaps that phagocytic microglia may serve a similar function in the CNS.
Two diverse mechanisms of endocytosis include phagocytosis and pinocytosis, wherein the difference between the two is the size of target molecules.
In some particular instances, drugs may be absorbed by fluid-phase endocytosis (pinocytosis), an energy-dependent saturable process in which the molecule travels inside membrane vesicles (Figure 1(f)).
The transfer of substances and the amount that enters the fetal circulation are tightly controlled by at least four different mechanisms; simple diffusion, active transport, biotransformation through metabolic enzymes, and phagocytosis or pinocytosis (Syme et al.
Alternatively, proteins can be actively transported across the blood--CSF barrier via pinocytosis. Because CNS is normally protected from the peripheral circulation, the presence of some bloodderived macromolecules in CSF may indicate a disruption of blood--CSF barrier that is thought to occur during aging as well as in some neurodegenerative disorders (17, 28).