Endocytic Process
Endocytic Process - Related Videos
08:02
Live-cell Imaging of Endocytic Transport using Functionalized Nanobodies in Cultured Cells
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Cited by 1 •
2025
Endocytic and retrograde transport of proteins from the plasma membrane to the trans-Golgi network is essential to maintaining membrane homeostasis and regulating signaling. Here, we describe a method to image and quantify endocytic transport of transmembrane cargo proteins by live-cell microscopy using derivatized anti-GFP nanobodies in HeLa cells.
11:32
Measuring Plasma Membrane Protein Endocytic Rates by Reversible Biotinylation
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Cited by 23 •
2009
Regulated endocytosis governs the cell surface expression levels of the majority of membrane proteins. Here we utilize reducible, membrane impermeant biotinylation reagents to measure the endocytic rate of the dopamine transporter (DAT), a polytopic membrane protein. The method facilitates a straightforward approach to measuring the endocytic rate of most plasma membrane proteins.
09:46
Simultaneous pH Measurement in Endocytic and Cytosolic Compartments in Living Cells using Confocal Microscopy
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Cited by 20 •
2014
Several methods are available for measuring intracellular pH but very few of these allow simultaneous measurement of cytoplasmic and organellar pH. Here, we describe in detail a rapid and accurate methodology to simultaneously measure cytoplasmic and vesicular pH by ratiometric imaging of living cells.
05:13
Density Gradient Ultracentrifugation for Investigating Endocytic Recycling in Mammalian Cells
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Cited by 1 •
2021
This paper aims to present a protocol for preparing recycling endosomes from mammalian cells using sucrose density gradient ultracentrifugation.
10:42
Determining Cell-surface Expression and Endocytic Rate of Proteins in Primary Astrocyte Cultures Using Biotinylation
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Cited by 6 •
2017
Two biotinylation-based methods, designed for determining the cell-surface expression and endocytic rate of proteins expressed at the plasma membrane, are presented in this report.
FAQs
Clathrin and related coat proteins assist the plasma membrane as it bends inward and forms an emerging vesicle. Their participation helps organize membrane regions around selected extracellular material before the vesicle pinches off. This coating mechanism supports controlled cargo internalization rather than indiscriminate uptake, linking membrane remodeling to the regulation of what enters the cell.
Early endosomes act as an intracellular sorting point for newly internalized cargo. Material delivered there can be directed toward recycling, continued transport, or lysosomal degradation. This sorting step gives the cell control over whether internalized components return to the cell surface, remain in an endocytic pathway, or are removed, allowing uptake to be coordinated with cellular needs.
Internalization changes the amount of receptor and other membrane components available at the cell surface. Once delivered to endosomes, receptors may be recycled or sent toward degradation, which can alter how strongly and how long a cell responds to extracellular signals. Consequently, endocytosis connects membrane trafficking with communication between cells and their environment.
Recycling returns selected internalized material or membrane components to the cell surface, helping maintain surface composition and reuse functional components. Lysosomal delivery instead directs cargo toward degradation. These alternative outcomes allow the endocytic process to balance recovery with removal, supporting membrane turnover and preventing internalized material from following a single unavoidable fate.
Endocytosis contributes to nutrient uptake, receptor regulation, membrane turnover, and cell signaling. These functions are connected: cells can acquire extracellular resources, adjust the abundance of surface components, and modify communication pathways through intracellular sorting. Because it affects both material exchange and signaling, the process is relevant to basic cell biology as well as broader studies of cellular behavior.
Some pathogens can exploit cellular internalization pathways to gain access to cells. Studying how extracellular material moves from the plasma membrane into vesicles and then through endosomal compartments can therefore clarify mechanisms of pathogen entry. This makes endocytic trafficking valuable in disease research, where altered uptake or intracellular transport may influence infection-related outcomes.
Drug delivery studies can use the cell's internalization and sorting machinery to investigate how therapeutic cargo enters cells and where it is transported afterward. Early endosomal routing may influence whether cargo is recycled, retained along the pathway, or delivered toward lysosomes. Understanding these destinations helps researchers evaluate intracellular delivery strategies and their potential effectiveness.