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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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Formation of the Platelet Plug01:22

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
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Phase II Reactions: Sulfation and Conjugation with α-Amino Acids01:19

Phase II Reactions: Sulfation and Conjugation with α-Amino Acids

Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
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Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

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El papel de los sulfatos en la agregación plaquetaria.

M Merten1, P Thiagarajan

  • 1Division of Cardiology, Department of Internal Medicine, University of Texas-Houston Medical School, Houston, TX, USA.

Circulation
|December 12, 2001
PubMed
Resumen

Los sulfatos son ligandos clave para la P-selectina, mediando la adhesión y agregación plaquetaria. Esta interacción estabiliza los agregados plaquetarios, revelando un nuevo mecanismo en la hemostasis y la trombosis.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología celular Biología celular.
  • Hematología Hematología.

Sus antecedentes:

  • Los sulfatos son glicosfingolipidos sulfatados que se encuentran en las superficies celulares.
  • Sus funciones fisiológicas exactas, particularmente en las plaquetas, siguen sin estar claras.

Objetivo del estudio:

  • Investigar el papel de los sulfatos en la adhesión y agregación plaquetaria.
  • Para identificar los ligandos de los sulfatos en las superficies de las plaquetas.

Principales métodos:

  • Evaluación de la adhesión plaquetaria a la P-selectina en presencia de sulfatos.
  • Utilizando micelas sulfatídicas y la proteína circumsporózoita de la malaria recombinante (MCSP) como inhibidores.
  • Evaluación del efecto de los anticuerpos anti-P-selectina en las interacciones plaqueta-sulfaturo.

Principales resultados:

  • Los sulfatos funcionan como un ligando principal para la P-selectina en las superficies de las plaquetas.
  • Las plaquetas que expresan sulfatidos se adhieren a la P-selectina, y esta adhesión es inhibida por MCSP.
  • Las células que expresan P-selectina se adhieren a los sulfatos, y esta interacción es inhibida por los anticuerpos anti-P-selectina.
  • Los anticuerpos anti-P-selectina y la MCSP revierten la agregación plaquetaria inducida por varios agonistas.

Conclusiones:

  • Las interacciones de sulfaturo-P-selectina son cruciales para la adhesión y agregación plaquetaria.
  • Estas interacciones estabilizan los agregados de plaquetas, lo que representa un nuevo mecanismo en la hemostasis y la trombosis.