Pinocytosis
Pinocytosis - Related Videos
00:38
Pinocytosis
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2025
Cells use energy-requiring bulk transport mechanisms to transfer large particles or large numbers of small particles into or out of the cell. The cells envelop the particles in spherical membranes called vesicles or vacuoles. Vesicles that transport material into the cell are built from the cell membrane. These vesicles encapsulate external molecules and transport them into the cell in a process called endocytosis. Pinocytosis ("cellular drinking") is one of three main types of endocytosis. In...
02:15
Pinocytosis
0 Views •
2026
Cells use energy-dependent bulk transport mechanisms to move large particles, or substantial quantities of small particles, into or out of the cell. During these processes, the cell surrounds the material with membrane-bound structures called vesicles or vacuoles. Vesicles that transport substances into the cell originate from the plasma membrane. These vesicles enclose extracellular material and deliver it into the cell through a process known as endocytosis.Pinocytosis (“cellular drinking”)...
09:27
An Introduction to Endocytosis and Exocytosis
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2023
Cells can take in substances from the extracellular environment by endocytosis and actively release molecules into it by exocytosis. Such processes involve lipid membrane-bound sacs called vesicles. Knowledge of the molecular architecture and mechanisms of both is key to understanding normal cell physiology, as well as the disease states that arise when they become defective. This video will first briefly review a few pivotal discoveries in the history of endo- and exocytosis research. Next,...
03:34
An In Vitro Technique to Visualize Exocytosis of Secretory Granules in Mast Cells
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2025
This video demonstrates a technique to visualize exocytosis in mast cells. The cells are incubated with FITC-dextran — a fluorescent reporter — which is taken up by cells inside secretory granules (SGs), where the acidic pH quenches its fluorescence. Upon stimulation of granule exocytosis, the medium's higher pH induces reporter fluorescence inside the fused SGs, which is visualized using a fluorescence microscope.
FAQs
Pinocytosis supports membrane regulation because the cell continually internalizes small portions of its surrounding fluid and plasma membrane. The resulting vesicles move those materials into the cell, linking uptake with changes in the cell’s composition. This makes the process relevant when cells respond to altered conditions outside the membrane.
The nonspecific nature of pinocytosis means uptake reflects nearby extracellular fluid rather than selection through a particular binding interaction. Consequently, dissolved substances can enter together in the same internalized fluid. This distinguishes the process from receptor-mediated endocytosis and helps explain how cells sample their environment while acquiring available materials.
After a vesicle forms, its contents are transported through the cell rather than remaining at the cell surface. That intracellular movement connects extracellular conditions with internal cellular processes and helps explain why pinocytosis contributes to communication with the surrounding environment. Vesicle transport also provides a route for internalized macromolecules.
A basic analysis of pinocytosis follows the membrane from invagination to pinch-off and then traces the newly formed vesicle as it transports fluid and dissolved substances through the cell. Focusing on these linked stages separates membrane deformation, vesicle formation, and intracellular transport, providing a structured way to interpret cellular uptake.
Researchers examine pinocytosis when they need to connect extracellular changes with cellular composition or internalization. In biology, the process provides context for studying nutrient acquisition, membrane regulation, and environmental responses. It is also relevant to physiology and immunology, where uptake and communication with the surrounding environment are important research concerns.
In drug delivery research, pinocytosis matters because cells can internalize extracellular fluid and dissolved substances within vesicles. This provides a biological context for considering how material outside a cell may enter and move through it. The process is therefore studied alongside broader questions about intracellular transport and the handling of macromolecules.