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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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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).
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Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.
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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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Maitotoxin, A Presumed Calcium Channel Activator, Induces the Acrosome Reaction in Mussel Spermatozoa: (maitotoxin/acrosome reaction/calcium channel activator/calcium channel antagonist/mussel sperm).

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Three Phases of Cortical Maturation during Meiosis Reinitiation in Starfish Oocytes: (starfish oocytes/fertilization envelope/calcium maturation).

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Biochemical Studies on the Acrosome Reaction of the Starfish, Asterias Amurensis II. Purification and Characterization of Acrosome Reaction-Inducing Substance.

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Purification of Co-ARIS, a Cofactor for Acrosome Reaction-Inducing Substance, from the Egg Jelly of Starfish.

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Intracellular pH Changes of Starfish Sperm Upon the Acrosome Reaction: (acrosome reaction/intracellular pH/starfish sperm/egg jelly/9-aminoacridine).

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Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy
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Low-Na

Tosikazu Amano1, Yoshihito Okita1, Motonori Hoshi1

  • 1Department of Life Science, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Nagatsuda, Midori-ku, Yokohama 227, Japan.

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

Sea urchin sperm histone degradation and acrosome reaction can be triggered by low sodium or egg jelly, involving complex ion and pH changes. These processes are crucial for understanding sperm activation.

Area of Science:

  • Reproductive Biology
  • Marine Biology
  • Sperm Physiology

Background:

  • Egg jelly is known to induce histone degradation and acrosome reaction in Asterina pectinifera spermatozoa.
  • Sperm activation involves complex signaling pathways, including ion fluxes and pH changes.

Purpose of the Study:

  • To investigate the role of ions, particularly sodium (Na+) and calcium (Ca2+), in sperm activation.
  • To elucidate the mechanisms underlying histone degradation and acrosome reaction in sea urchin spermatozoa.

Main Methods:

  • Spermatozoa were dispersed in Na+-free seawater to induce histone degradation.
  • Experiments involved varying external ion concentrations (Na+, Ca2+, K+), pH, and using channel antagonists (verapamil, diltiazem).
  • Intracellular pH (pHi) changes and acrosome reactions were monitored.

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Main Results:

  • Na+-free seawater induced histone degradation without acrosome reaction, requiring less Ca2+ than jelly-induced activation and unaffected by verapamil or diltiazem.
  • Egg jelly-induced histone degradation was blocked in Ca2+-free seawater but rescued by Na+-free seawater.
  • Low Na+ seawater (10-30 mM) induced a Ca2+-dependent acrosome reaction with rapid pHi increase followed by a decrease; diltiazem partially inhibited pHi decrease but not the reaction.

Conclusions:

  • Sperm histone degradation and acrosome reaction can be differentially regulated by ionic conditions.
  • Na+ plays a critical role in triggering the acrosome reaction, associated with significant pHi changes.
  • The study highlights distinct ionic requirements for histone degradation versus acrosome reaction in Asterina pectinifera spermatozoa.