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GPCR Desensitization01:12

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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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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Spatiotemporal Characterization of GPCR Activity and Function during Endosomal Trafficking Pathway.

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Internalized G protein-coupled receptors (GPCRs), like beta-2 adrenergic receptor (B2AR), remain active for hours within endosomes, continuing to signal. This sustained activity impacts cellular functions and can be tracked using novel biosensors and kinetic models.

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Area of Science:

  • Cellular Biology
  • Molecular Pharmacology
  • Biophysics

Background:

  • G protein-coupled receptors (GPCRs) mediate cellular responses to external signals.
  • While typically desensitized after internalization, some GPCRs retain activity within endosomes.
  • The spatiotemporal activity of internalized GPCRs, such as beta-2 adrenergic receptor (B2AR), remains poorly understood.

Purpose of the Study:

  • To characterize the real-time activity and downstream signaling of internalized B2AR.
  • To investigate the duration and localization of B2AR activity during endosomal trafficking.
  • To develop a kinetic model for describing B2AR activity over time.

Main Methods:

  • Utilized a fluorescence resonance energy transfer (FRET)-based B2AR biosensor.
  • Employed cAMP reporters tethered to endosomes at various trafficking stages.
  • Analyzed agonist-induced B2AR activity at the single-vesicle level.

Main Results:

  • Internalized B2ARs demonstrated sustained activity for several hours within endosomes.
  • Continued cAMP production was observed from internalized B2ARs.
  • A modified Ricker model accurately described the temporal kinetics of B2AR activity.

Conclusions:

  • Internalized B2ARs maintain functional activity and downstream signaling for extended periods.
  • The developed GPCR monitoring system and kinetic model offer insights into spatiotemporal GPCR activity.
  • This approach can advance the understanding of GPCR dynamics in endosomal trafficking.