Apical Basolateral Domains
Apical Basolateral Domains - Related Videos
01:17
Assessment of apical pulse
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2025
Assessing the Apical Pulse Assessing the apical pulse is a critical nursing procedure, particularly indicated for: • Children younger than two years. • Cardiac patients. • Patients before administering specific medications (e.g., cardiac glycosides like digoxin). Location: The apical pulse is auscultated at the left midclavicular line. It is located at the 5th intercostal space, where the heart's apex is closest to the chest wall. Preparation: Gather Equipment: Ensure you have a...
02:26
Conservation of Protein Domains Over Different Proteins
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2020
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms. A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
06:08
Apical Resection Mouse Model to Study Early Mammalian Heart Regeneration
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Cited by 12 •
2016
A step-by-step video protocol of apical resection is demonstrated in this study. Apical resection is a recently highlighted surgical approach in mammalian heart regeneration research. This study may promote the application of apical resection as a standard methodology in research into the mechanism underlying heart regeneration.
09:11
In Vitro Apical-Out Enteroid Model of Necrotizing Enterocolitis
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Cited by 7 •
2022
This protocol describes an apical-out necrotizing enterocolitis (NEC)-in-a-dish model utilizing small intestinal enteroids with reversed polarity, allowing access to the apical surface. We provide an immunofluorescent staining protocol to detect NEC-related epithelial disruption and a method to determine the viability of apical-out enteroids subjected to the NEC-in-a-dish protocol.
01:21
Three-Domain System of Life
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2025
Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
FAQs
Tight junctions help preserve the boundary between the lumen-facing membrane and the surfaces that contact neighboring cells or underlying tissue. By maintaining this separation, they prevent membrane components from freely mixing between domains. Their organization therefore supports epithelial barrier selectivity and allows each surface to perform distinct transport, adhesion, and signaling functions.
Intracellular sorting pathways direct receptors, channels, and transporters to their appropriate membrane domains. This targeted delivery ensures that proteins reach the surface where their activity is needed rather than being distributed indiscriminately. In epithelial cells, accurate sorting is therefore essential for coordinated transport, selective barrier formation, and signaling across different cellular surfaces.
Cytoskeletal systems help organize and maintain the polarized arrangement of epithelial-cell membranes. In combination with intracellular sorting pathways, they support the directed placement of membrane proteins and preserve domain-specific organization. Disruption of this coordination can interfere with the separation of cellular functions and compromise transport, adhesion, or signaling.
They allow epithelial cells to move ions, nutrients, and fluids in a directed, or vectorial, manner across the tissue. Because membrane proteins are assigned to particular domains, uptake or release activities can be spatially separated within the same cell. This arrangement converts membrane polarity into coordinated epithelial transport rather than undirected exchange.
A useful investigation considers whether tight junctions preserve the domain boundary, whether receptors, channels, and transporters reach the correct membrane region, and whether cytoskeletal organization supports that pattern. Researchers can then relate domain organization to barrier formation, transport, signaling, and adhesion, providing a framework for identifying which aspect of epithelial function has changed.
These domains connect membrane organization with the normal physiology of epithelial tissues, including selective barriers and directed movement of ions, nutrients, and fluids. They also provide a framework for studying disease states in which polarity, junctions, or membrane trafficking become disrupted. Comparing these features helps link cellular organization to impaired epithelial function.