Epithelial Membranes
Epithelial Membranes - Related Videos
11:53
Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos
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Cited by 6 •
2016
To study the mechanism of lipid utilization in yolk sac membranes during the late stages of avian embryonic development, we established a primary Japanese quail embryonic endodermal epithelial cell culture system.
08:51
Mammary Epithelial Transplant Procedure
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Cited by 23 •
2010
This article demonstrates the procedure developed by DeOme KB et al. (1959) and the sparing procedure developed by Brill B et al. (2008) for clearing the 4th inguinal mammary fat pad of a pubescent mouse in preparation for transplantation of mammary fragments, mammary epithelial cells, or mammary tumor cells.
10:08
Establishing a Three-Dimensional Coculture Module of Epithelial Cells Using Nanofibrous Membranes
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2024
Here, we demonstrate how epithelial cells cultured with fibroblasts in the nanofibrous membrane-based two-layer system can stably adhere to and grow on the membrane.
10:00
In Vitro Culture of Epithelial Cells from Different Anatomical Regions of the Human Amniotic Membrane
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Cited by 8 •
2019
This protocol describes the isolation of epithelial cells from different anatomical regions of the human amniotic membrane to determine their heterogeneity and functional properties for possible application in clinical and physiopathological models.
14:32
Primary Human Bronchial Epithelial Cells Grown from Explants
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Cited by 19 •
2010
Here we describe a detailed method for growing primary human bronchial epithelial cells from explants of human bronchial airway tissue including differentiated growth on an air-liquid interface. This method provides an abundant source of primary cells for investigating the role of the airway epithelium in human lung health and disease.
FAQs
Apical-basolateral polarity organizes epithelial cells into functionally different surfaces. The apical side faces an external surface or internal cavity, whereas the basolateral side connects with neighboring tissue compartments. This arrangement lets transport proteins and junctional structures operate in coordinated locations, enabling epithelial membranes to direct movement across a barrier rather than treating the cell layer as uniform.
Tight junctions regulate movement between adjacent epithelial cells while also helping preserve the continuity of the tissue sheet. Their importance is therefore both selective and structural: they limit uncontrolled movement through cell-cell boundaries and maintain separation between tissue compartments. Examining junctional integrity helps explain how epithelial membranes remain effective barriers during normal organ function.
Membrane proteins and specialized transport pathways give epithelial cells control over ions, water, nutrients, and signaling molecules. Their coordinated activity supports absorption and secretion while directing movement across the barrier. Because these components work within polarized cells, studying them reveals how a tissue regulates exchange through organized cellular mechanisms.
The same barrier principles produce different biological outcomes in different locations. In skin, epithelial membranes contribute to protection; in the intestine, they support nutrient absorption; in the kidney, they participate in filtration; and in respiratory tissues, they contribute to defense. These examples connect membrane organization with organ-specific physiology.
Studying epithelial membranes connects cellular organization to whole-organ behavior. Researchers can examine how polarity, junctional control, and transport systems relate to protection, regulated exchange, absorption, secretion, filtration, and defense. This framework is useful because it links the behavior of individual cells with the functions performed by intact tissues and organs.
When epithelial barriers are disrupted, the consequences can extend beyond individual cells. Loss of junctional control or altered transport may disturb tissue integrity and the regulated movement of substances across the barrier. For this reason, epithelial membrane biology provides context for understanding how changes in barrier function contribute to disease in organs and body surfaces.