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Related Concept Videos

Active Transport01:14

Active Transport

1.6K
Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
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Carrier-Mediated Transport01:06

Carrier-Mediated Transport

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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Membrane Transporters01:31

Membrane Transporters

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Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
Transporters are mainly composed of alpha-helices, built from bundles of ten or more helices traversing the plasma membrane. The solute-binding sites are located midway, where some of the helices are broken or distorted, making space for the binding site through...
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Secondary Active Transport01:32

Secondary Active Transport

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Secondary Active Transport01:55

Secondary Active Transport

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
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Equilibrative Nucleoside Transporter 2: Properties and Physiological Roles.

Safaa M Naes1,2, Sharaniza Ab-Rahim1, Musalmah Mazlan1

  • 1Department of Biochemistry & Molecular Medicine, Faculty of Medicine, Universiti Teknologi MARA, Cawangan Selangor, Kampus Sungai Buloh, 47000 Sungai Buloh, Selangor, Malaysia.

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Equilibrative nucleoside transporter 2 (ENT2) is a key transporter involved in nucleoside uptake and drug delivery for cancer therapy. Its roles in cell signaling and progression highlight its potential as a therapeutic target.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Equilibrative nucleoside transporter 2 (ENT2) is a ubiquitous membrane transporter.
  • ENT2 facilitates the uptake of nucleosides and nucleobases.
  • It also transports nucleoside-derived drugs used in anticancer therapy.

Purpose of the Study:

  • To highlight the main roles of ENT2.
  • To provide an update on recent research concerning ENT2.
  • To explore ENT2's functions beyond its transport mechanism.

Main Methods:

  • Literature review of existing research on ENT2.
  • Analysis of studies investigating ENT2's role in cancer.
  • Examination of ENT2's involvement in cellular processes.

Main Results:

  • High ENT2 expression correlates with advanced cancer stages.
  • ENT2 is implicated in crucial signaling pathways.
  • ENT2 plays a role in cell cycle progression.

Conclusions:

  • ENT2 is a significant factor in cancer progression and drug transport.
  • Understanding ENT2's diverse physiological roles is crucial.
  • ENT2 represents a promising therapeutic target for cancer treatment.