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Adrenergic Receptors: ɑ Subtype01:31

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Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
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Adrenergic receptors, or adrenoceptors, respond to the autonomic neurotransmitter noradrenaline and other endogenous catecholamine agonists. They are classified into two main families, α and β, based on their pharmacological response and are further subdivided depending on their location, elicited response, and affinity to specific agonists or antagonists.
α-Adrenoceptors
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Adrenergic Receptors: β Subtype01:26

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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
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The ADP/ATP Carrier Protein01:42

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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Adrenergic Agonists: Indirect-Acting Agents01:25

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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
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Mitochondrial Localization and Function of Adenosine Receptors.

Alejandro Sánchez-Melgar1, Valentina Vultaggio-Poma2, Simoneta Falzoni2

  • 1Department of Inorganic, Organic Chemistry and Biochemistry. Faculty of Medicine of Ciudad Real / Faculty of Chemical Sciences and Technologies. Institute of Biomedicine (IB-UCLM). IDISCAM. University of Castilla-La Mancha. Ciudad Real, Spain.

International Journal of Biological Sciences
|March 14, 2025
PubMed
Summary

Mitochondria host functional adenosine receptors (A1 and A2) that modulate cellular energy metabolism and mitochondrial structure. This finding reveals new roles for G-protein coupled receptors (GPCRs) beyond the cell surface.

Keywords:
ATP productionadenosine receptorsintracellular GPCRmitochondrial morphology

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • G-protein coupled receptors (GPCRs) are primarily known as cell surface proteins mediating external signals.
  • Emerging evidence suggests intracellular localization, including within mitochondria.
  • Adenosine receptors, a type of GPCR, have been investigated for non-canonical roles.

Purpose of the Study:

  • To investigate the presence and function of adenosine receptors within mitochondria.
  • To determine if these mitochondrial receptors influence mitochondrial energy metabolism.
  • To explore the impact of adenosine receptor activation on mitochondrial morphology.

Main Methods:

  • Western blotting and radioligand binding to detect receptor presence.
  • Electron microscopy and 3D morphological analysis for structural assessment.
  • Enzymatic activity assays, oxygen consumption, and ATP production measurements for functional analysis.

Main Results:

  • Adenosine A1 and A2 receptors were confirmed in isolated mitochondria from various cell types and tissues.
  • Mitochondrial adenosine receptors were found to be functional, modulating adenylyl cyclase activity.
  • Activation of A1, A2A, and A2B receptors altered mitochondrial ATP production, coupling efficiency, proton leak, and respiration.
  • Agonist exposure induced morphological changes in mitochondria within HeLa cells.

Conclusions:

  • Mitochondria contain functional adenosine receptors (A1 and A2).
  • These receptors play a significant role in regulating mitochondrial energy metabolism.
  • Adenosine receptors represent novel targets for modulating mitochondrial function and cellular energetics.