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Related Concept Videos

Activation and Inactivation of G Proteins01:22

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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G12/13 signaling in asthma.

Elizabeth L McDuffie1, Reynold A Panettieri2, Charles P Scott3

  • 1Department of Biochemistry and Molecular Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.

Respiratory Research
|August 2, 2024
PubMed
Summary
This summary is machine-generated.

Asthma involves airway smooth muscle shortening via calcium signaling. G12/13 protein pathways likely activate RhoA, mediating this process and suggesting new asthma treatment targets.

Keywords:
Airway hyperresponsivenessAirway remodelingAnticholinergic agentsAsthmaBronchoconstrictionCalcium sensitizationG12/13InflammationMuscarinic 3 acetylcholine receptorRhoA

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Area of Science:

  • Pulmonary medicine
  • Cellular signaling
  • Molecular pharmacology

Background:

  • Asthma is characterized by airway smooth muscle shortening and bronchoconstriction.
  • Airway shortening results from calcium-dependent myosin light chain kinase activation and RhoA-dependent calcium sensitization, which inhibits myosin light chain phosphatase.
  • The precise mechanism by which pro-contractile stimuli trigger calcium sensitization remains unclear.

Purpose of the Study:

  • To investigate the role of G protein-coupled receptors and RhoA signaling in airway smooth muscle contraction.
  • To elucidate the mechanism of calcium sensitization in asthma pathophysiology.
  • To identify potential therapeutic targets for asthma treatment.

Main Methods:

  • Literature review and synthesis of existing research on G protein signaling, RhoA activation, and airway smooth muscle function.
  • Analysis of data on pro-contractile agonists' effects on RhoA, Rho kinase, actin polymerization, and myosin light chain phosphorylation.
  • Hypothesis generation based on integrated evidence.

Main Results:

  • Pro-contractile G protein-coupled receptors likely signal through the G12/13 pathway to activate RhoA.
  • Activated RhoA mediates calcium sensitization, contributing to airway smooth muscle shortening.
  • This signaling cascade is consistent with observed effects on RhoA and Rho kinase activation, actin polymerization, and myosin light chain phosphorylation.

Conclusions:

  • The G12/13-RhoA signaling pathway is a probable mechanism underlying pro-contractile stimuli-induced calcium sensitization in asthma.
  • Understanding this pathway rationalizes asthma pathophysiology, including airway hyperresponsiveness, immune activation, and remodeling.
  • Targeting G12/13 or RhoA signaling presents a promising avenue for novel asthma therapies.