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Related Concept Videos

cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Regulation of Metabolism01:19

Regulation of Metabolism

Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
Global Regulatory Systems01:28

Global Regulatory Systems

Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
Allosteric Regulation01:08

Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...

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AMPK-Dependent Metabolic Regulation by PPAR Agonists.

Woo Hyung Lee1, Sang Geon Kim

  • 1College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul 151-742, Republic of Korea.

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|September 4, 2010
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Summary

Peroxisome proliferator-activated receptors (PPARs) influence cell functions and metabolic disease treatments. PPAR agonists modulate AMP-activated protein kinase (AMPK) activity, offering therapeutic potential.

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Area of Science:

  • Metabolic signaling pathways
  • Nuclear receptor pharmacology
  • Cellular homeostasis regulation

Background:

  • Peroxisome proliferator-activated receptors (PPARs) are crucial regulators of cellular processes.
  • PPAR subtypes (PPARalpha, PPARbeta/delta, PPARgamma) impact diverse tissues like the liver, muscle, and fat.
  • PPAR agonists show therapeutic potential, particularly in metabolic diseases.

Purpose of the Study:

  • To summarize the metabolic effects of PPAR agonists.
  • To highlight the role of AMP-activated protein kinase (AMPK) in mediating these effects.
  • To explore the independent activation of AMPK by PPAR agonists.

Main Methods:

  • Literature review of studies on PPAR agonists and AMPK.
  • Analysis of PPAR subtype-specific effects in various tissues.
  • Examination of the interplay between PPARs and AMPK signaling.

Main Results:

  • PPAR agonists influence cell growth, differentiation, and homeostasis.
  • PPARalpha and PPARgamma agonists modulate AMPK activity.
  • AMPK activation by PPAR agonists may occur independently of direct receptor binding.

Conclusions:

  • PPAR agonists have significant metabolic effects, partly through AMPK modulation.
  • The AMPK-activating action of PPAR agonists offers a potential therapeutic mechanism for metabolic disorders.
  • Further research into PPAR-AMPK interactions is warranted for drug development.