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Related Concept Videos

Introduction to Membrane Traffic01:44

Introduction to Membrane Traffic

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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
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Membrane Asymmetry Regulating Transporters01:19

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Cellular Membranes and Drug Transport01:24

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Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
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Non-gated Ion Channels01:24

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Ion Channels01:19

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Transcellular Transport of Solutes01:23

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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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A Fluorescence-Based Assay of Membrane Potential for High-Throughput Functional Study of Two Endogenous Ion Channels in Two Epithelial Cell Lines
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Membrane trafficking pathways regulating the epithelial Na+ channel.

Adam W Ware1, Sahib R Rasulov1, Tanya T Cheung1

  • 1Department of Physiology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand.

American Journal of Physiology. Renal Physiology
|October 29, 2019
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Summary

The epithelial sodium channel (ENaC) regulates blood pressure by controlling sodium reabsorption in the kidneys. This study details how ENaC trafficking to and from the cell surface is regulated.

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aldosteronekidneyneural precursor cell-expressed developmentally downregulated 4-2retromerubiquitin

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Area of Science:

  • Nephrology
  • Cell Biology
  • Physiology

Background:

  • Renal sodium reabsorption is crucial for maintaining blood volume and pressure.
  • The epithelial sodium channel (ENaC) plays a key role in this process.
  • Regulation of ENaC at the cell surface is essential for fine-tuning sodium balance.

Purpose of the Study:

  • To summarize the regulatory mechanisms controlling the number of ENaCs in the apical membrane.
  • To elucidate pathways involved in ENaC synthesis, trafficking, and degradation.
  • To provide an overview of how ENaC trafficking pathways are regulated.

Main Methods:

  • Review of existing literature on ENaC regulation.
  • Analysis of cellular pathways involved in protein trafficking.
  • Focus on synthesis, apical targeting, endocytosis, recycling, and degradation of ENaC.

Main Results:

  • ENaC abundance at the apical membrane is tightly controlled.
  • Multiple pathways govern ENaC synthesis, delivery, and removal.
  • Regulation of ENaC trafficking is a complex process involving various cellular mechanisms.

Conclusions:

  • Understanding ENaC trafficking is key to understanding renal sodium handling.
  • Dysregulation of ENaC trafficking can impact blood pressure homeostasis.
  • Targeting ENaC trafficking pathways may offer therapeutic strategies for hypertension.