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Related Concept Videos

Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Antiepileptic Drugs: Sodium Channel Blockers01:08

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Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
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Chemical Dimerization-Induced Protein Condensates on Telomeres
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Dimerization of the Sodium/Iodide Symporter.

Rebecca J Thompson1,2, Alice Fletcher1,2, Katie Brookes1,2

  • 1Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, United Kingdom.

Thyroid : Official Journal of the American Thyroid Association
|July 17, 2019
PubMed
Summary

Thyroid cancer treatment relies on iodide uptake by the sodium/iodide symporter (NIS). This study confirms NIS dimerization is crucial for its function and may offer new strategies to improve radioiodide therapy for non-responsive thyroid cancers.

Keywords:
NISdimerizationradioiodide uptakethyroid

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Radioiodide therapy is effective for most thyroid cancers, but some patients lose sodium/iodide symporter (NIS) function, leading to treatment failure.
  • Mechanisms regulating NIS activity, particularly dimerization, are poorly understood, yet dimerization is a common regulatory mechanism for membrane proteins.

Purpose of the Study:

  • To investigate whether the sodium/iodide symporter (NIS) dimerizes.
  • To determine if NIS dimerization is essential for iodide uptake and radioiodide therapy efficacy.
  • To identify specific residues involved in NIS dimerization.

Main Methods:

  • Coimmunoprecipitation, proximity ligation, and Förster resonance energy transfer (FRET) assays were employed to detect NIS-NIS interactions.
  • Homology modeling based on the vSGLT structure was used to predict potential dimerization interfaces and critical residues.
  • Site-directed mutagenesis was performed to assess the functional impact of specific NIS residues on dimerization and iodide uptake.

Main Results:

  • In vitro assays confirmed abundant dimerization of NIS in cells.
  • NIS dimerization was observed at the plasma membrane and other cellular compartments.
  • Mutations at critical residues Y242 and T243 abolished NIS function, while mutation at Q471 did not affect radioiodide uptake, indicating specific residues are essential for dimerization.

Conclusions:

  • This study provides the first evidence of NIS dimerization in vitro and identifies key residues involved.
  • NIS dimerization is hypothesized to be critical for proper trafficking to the plasma membrane.
  • Understanding NIS dimerization may reveal novel therapeutic targets to overcome radioiodide therapy resistance in thyroid cancer.