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Related Concept Videos

Inflammation01:38

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Phosphate Buffer01:22

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The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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SN1 Reaction: Stereochemistry02:15

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
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SN1 Reaction: Kinetics02:05

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In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
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SN1 Reaction: Mechanism02:25

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
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Related Experiment Video

Updated: Jan 25, 2026

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
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Sphingosine 1-phosphate and inflammation.

Hideru Obinata1, Timothy Hla2

  • 1Gunma University Initiative for Advanced Research, Showa-machi, Maebashi, Gunma, Japan.

International Immunology
|May 4, 2019
PubMed
Summary
This summary is machine-generated.

Sphingosine 1-phosphate (S1P) signaling regulates lymphocyte movement and vascular integrity. Targeting S1P receptors, like with FTY720 for multiple sclerosis, impacts inflammation and immunity.

Keywords:
G-protein-coupled receptorlipid mediatorlysophospholipidsphingolipid

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Area of Science:

  • Immunology
  • Cardiovascular Biology
  • Pharmacology

Background:

  • Sphingosine 1-phosphate (S1P) is a lipid mediator regulating cellular functions through G protein-coupled receptors (S1P1-5).
  • The S1P-S1P receptor system is crucial for lymphocyte trafficking, vascular integrity, and inflammatory processes.
  • A steep S1P gradient facilitates lymphocyte egress from lymphoid organs, forming the basis for immunosuppressive drugs.

Purpose of the Study:

  • To review the critical roles of the S1P-S1P receptor signaling system in inflammation.
  • To highlight the significance of S1P in lymphocyte trafficking and vascular homeostasis.
  • To present findings on apolipoprotein M as an S1P chaperone influencing high-density lipoprotein properties.

Main Methods:

  • Literature review of S1P-S1P receptor signaling pathways.
  • Analysis of studies on lymphocyte egress and immune modulation.
  • Examination of research on vascular integrity, angiogenesis, and atherosclerosis.
  • Inclusion of recent findings on apolipoprotein M and its role in lipoprotein function.

Main Results:

  • S1P receptor modulation, exemplified by FTY720, effectively reduces circulating lymphocytes by inhibiting egress, leading to immunosuppression.
  • Dysregulation of S1P signaling causes vascular defects, including aberrant angiogenesis and increased vascular permeability, contributing to inflammation and atherosclerosis.
  • Apolipoprotein M, bound to HDL, contributes to the anti-inflammatory and endothelial-protective effects of HDL.

Conclusions:

  • The S1P-S1P receptor signaling system is a key regulator of immune cell trafficking and vascular health.
  • Targeting S1P pathways offers therapeutic potential for inflammatory and autoimmune diseases, such as multiple sclerosis.
  • Apolipoprotein M plays a significant role in the protective functions of HDL, modulating S1P's effects on vascular endothelium.