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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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Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

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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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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Introduction to Electrolytes01:33

Introduction to Electrolytes

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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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One...
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Ionic Strength: Overview01:12

Ionic Strength: Overview

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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
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Expression of Na

Keiko Mitsunaga-Nakatsubo1, Miyuki Kanda1, Ken Yamazaki1

  • 1Department of Biology, School of Education, Waseda University, 1-6-1, Nishiwaseda, Shinjuku-ku, Tokyo 169-50, Japan.

Development, Growth & Differentiation
|June 7, 2023
PubMed
Summary

Sea urchin embryo development shows increased sodium-potassium ATPase (Na+, K+-ATPase) activity and mRNA levels during gastrulation. This enzyme

Keywords:
(sea urchin embryoNa+, K+-ATPaseanimalizationectoderm cellvegetalization

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Marine Biology

Background:

  • The sodium-potassium ATPase (Na+, K+-ATPase) is crucial for cellular function and development.
  • Understanding gene expression dynamics during sea urchin embryogenesis provides insights into cell differentiation.
  • Previous studies have indicated the importance of ion transport in early development.

Purpose of the Study:

  • To investigate the changes in Na+, K+-ATPase activity and mRNA levels during sea urchin embryonic development.
  • To determine the role of Na+, K+-ATPase in cell differentiation, specifically ectoderm formation.
  • To correlate Na+, K+-ATPase gene expression with experimentally induced developmental patterns (animalization and vegetalization).

Main Methods:

  • Northern blotting analysis was employed to detect and quantify Na+, K+-ATPase mRNA levels.
  • cDNA cloning and hybridization techniques were used to identify and probe for the Na+, K+-ATPase α-subunit mRNA.
  • Enzyme activity assays were performed to measure Na+, K+-ATPase activity in different embryonic fractions and experimentally manipulated embryos.

Main Results:

  • A significant increase in Na+, K+-ATPase mRNA levels and activity was observed between the swimming blastula and late gastrula stages.
  • Higher Na+, K+-ATPase mRNA levels were found in the ectoderm cell fraction compared to mesoderm and endoderm fractions.
  • Animalized embryos exhibited elevated Na+, K+-ATPase activity and mRNA, while vegetalized embryos showed reduced levels compared to normal embryos.

Conclusions:

  • The expression of the Na+, K+-ATPase gene is upregulated during specific stages of sea urchin embryogenesis, coinciding with ectoderm differentiation.
  • Increased Na+, K+-ATPase gene expression serves as a molecular marker for ectoderm cell differentiation in post-gastrula sea urchin embryos.
  • The study highlights the link between ion transport regulation and cell fate determination during early embryonic development.