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Phosphate Buffer01:22

Phosphate Buffer

5.0K
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.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
5.0K
Roles of Electrolytes: Calcium and Phosphate01:27

Roles of Electrolytes: Calcium and Phosphate

1.1K
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.
The calcium concentration in blood plasma is primarily...
1.1K
SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.2K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
10.2K
SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

9.6K
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.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
9.6K
SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

14.1K
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. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
14.1K
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

11.1K

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
11.1K

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A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
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Ceramide and sphingosine 1-phosphate in adipose dysfunction.

Zijian Fang1, Susan Pyne1, Nigel J Pyne1

  • 1Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral St, Glasgow G4 0RE, United Kingdom.

Progress in Lipid Research
|April 6, 2019
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Summary

Obesity-linked adipose dysfunction involves ceramides and sphingosine 1-phosphate (S1P), disrupting insulin signaling and promoting inflammation. Therapeutic strategies targeting these pathways may restore metabolic health and improve insulin sensitivity in type 2 diabetes.

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Area of Science:

  • Metabolic research
  • Cell biology
  • Endocrinology

Background:

  • Obesity increases the risk of metabolic syndrome, type 2 diabetes, and cardiovascular diseases.
  • Pathological adipose tissue expansion disrupts lipid metabolism, adipocyte turnover, and endocrine function.
  • Ceramides and sphingosine 1-phosphate (S1P) play critical roles in adipose dysfunction.

Purpose of the Study:

  • To explore the molecular mechanisms underlying adipose dysfunction in obesity.
  • To investigate the roles of ceramides and S1P in metabolic perturbations.
  • To discuss potential therapeutic strategies for restoring adipose function and insulin sensitivity.

Main Methods:

  • Analysis of molecular controls in adipose tissue expansion.
  • Examination of lipid metabolism and profile alterations.
  • Review of existing literature on ceramide and S1P pathways.

Main Results:

  • Aberrant ceramide biosynthesis blocks insulin signaling and promotes adipose inflammation.
  • Sphingosine 1-phosphate (S1P) induces chronic inflammation and inhibits adipogenesis.
  • Distinct lipid profiles are observed in abnormal lipid metabolism.

Conclusions:

  • Targeting ceramide biosynthesis (e.g., using sphingomyelinase or dihydroceramide desaturase inhibitors) offers a therapeutic avenue.
  • Antagonism of S1P receptors, like S1P2, may reverse adipose dysfunction.
  • Restoring normal adipose function is crucial for increasing insulin sensitivity in type 2 diabetes.