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Thyroid-stimulating hormone receptor activity after internalization.

D Calebiro1

  • 1Institute of Pharmacology and Toxicology and Rudolf-Virchow Center, DFG-Research center for experimental biomedicine, University of Würzburg, Würzburg, Germany. davide.calebiro@toxi.uni-wuerzburg.de

Annales D'Endocrinologie
|April 23, 2011
PubMed
Summary
This summary is machine-generated.

Internalized thyroid-stimulating hormone receptors (TSHRs) can continue signaling via cyclic AMP (cAMP) within endosomes. This intracellular signaling is persistent and distinct from cell-surface signaling, suggesting endosomes are active signaling platforms.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Molecular Pharmacology

Background:

  • Thyroid-stimulating hormone receptor (TSHR) is a G-protein-coupled receptor (GPCR) primarily linked to G(s) proteins.
  • TSHR activation stimulates adenylyl cyclase, increasing intracellular cyclic AMP (cAMP).
  • GPCRs, including TSHR, internalize upon prolonged stimulation but were thought to cease signaling.

Purpose of the Study:

  • To investigate if internalized TSHRs can continue to signal.
  • To characterize the nature of signaling from internalized GPCRs.
  • To explore the role of endosomes in GPCR signaling.

Main Methods:

  • Studies on TSHR signaling pathways.
  • Analysis of GPCR internalization and intracellular signaling.
  • Comparison of cell-surface versus intracellular GPCR signaling.

Main Results:

  • Internalized TSHRs were found to continue G(s)-cAMP signaling within an intracellular compartment.
  • This intracellular cAMP signaling is persistent and differs from cell-surface signaling.
  • Evidence suggests internalized GPCRs can mediate specific signaling outcomes.

Conclusions:

  • Endosomes are not merely degradation vesicles but active platforms for GPCR signaling.
  • Internalized GPCRs can sustain signaling, offering new insights into cellular regulation.
  • Further research is needed to understand the physiological and pathophysiological implications of endosomal GPCR signaling.