Gap Junction Proteins
Gap Junction Proteins - Related Videos
01:37
Gap Junctions
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2026
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
01:27
Gap Junctions
0 Views •
2023
The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
11:31
Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
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Cited by 5 •
2017
Intercellular junctions are requisites for mammary gland stage-specific functions and development. This manuscript provides a detailed protocol for the study of protein-protein interactions (PPIs) and co-localization using murine mammary glands. These techniques allow for the investigation of the dynamics of the physical association between intercellular junctions at different developmental stages.
06:26
Analysis of the Gap Junction-dependent Transfer of miRNA with 3D-FRAP Microscopy
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Cited by 6 •
2017
Here, we describe the application of three-dimensional fluorescence recovery after photobleaching (3D-FRAP) for the analysis of the gap junction-dependent shuttling of miRNA. In contrast to commonly applied methods, 3D-FRAP allows for the quantification of the intercellular transfer of small RNAs in real time, with high spatio-temporal resolution.
11:02
A Functional Assay for Gap Junctional Examination; Electroporation of Adherent Cells on Indium-Tin Oxide
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Cited by 3 •
2014
This presentation demonstrates a method whereby electroporation of adherent, cultured cells is used for the study of intercellular, junctional communication, while the cells grow on a slide coated with conductive and transparent indium-tin oxide.
FAQs
Movement through the intercellular pore follows electrochemical gradients, so ions and small signaling molecules pass according to differences in electrical charge and chemical concentration. This allows neighboring cells to exchange information directly rather than relying solely on signals released into surrounding tissue. The resulting transfer can synchronize cellular activities across a connected group.
A connexon is formed from six connexin subunits, but communication between cells requires two connexons, one from each neighboring membrane, to align and create a continuous pore. This arrangement establishes a physical route across the space between cells. Without alignment, the subunits would not provide the uninterrupted pathway needed for intercellular exchange.
The composition of gap junctions is biologically important because connexin subunits assemble into the channel structures that connect cells. Differences in composition, together with regulatory control, can therefore influence how intercellular communication is organized within a tissue. This helps explain why gap-junction behavior is relevant to coordinated electrical activity, metabolism, growth signals, and tissue maintenance.
In cardiac tissue, direct communication through these channels helps synchronize electrical activity needed for coordinated contraction. In neural tissue, the same communication principle supports coordination among connected cells. These examples show that gap junction proteins contribute to tissue-level function by linking the activity of individual cells rather than treating each cell as an isolated unit.
Gap-junction communication helps coordinate growth signals between neighboring cells, making it relevant to embryonic development and ongoing tissue maintenance. Direct exchange can connect local cellular behavior with broader tissue needs. When this communication is properly regulated, cells can participate in coordinated patterns of growth and upkeep instead of responding independently.
Altered gap-junction communication can change how cells coordinate physiology, because ions and small signaling molecules no longer support normal tissue-wide synchronization. Studying such disruption connects molecular changes in membrane proteins with effects on cardiac, neural, developmental, or maintenance-related functions. This makes gap junctions useful for understanding how impaired intercellular communication can contribute to disease.