Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Molecular Signature That Determines the Acute Tolerance of G Protein-Coupled Receptors

  • Min, Chengchun (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Zhang, Xiaohan (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Zheng, Mei (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Sun, Ningning (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Acharya, Srijan (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Zhang, Xiaowei (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Kim, Kyeong-Man (Pharmacology Laboratory, College of Pharmacy, Chonnam National University)
  • Received : 2016.09.01
  • Accepted : 2016.11.15
  • Published : 2017.05.01
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Abstract

Desensitization and acute tolerance are terms used to describe the attenuation of receptor responsiveness by prolonged or intermittent exposure to an agonist. Unlike desensitization of G protein-coupled receptors (GPCRs), which is commonly explained by steric hindrance caused by the ${\beta}$-arrestins that are translocated to the activated receptors, molecular mechanisms involved in the acute tolerance of GPCRs remain unclear. Our studies with several GPCRs and related mutants showed that the acute tolerance of GPCRs could occur independently of agonist-induced ${\beta}$-arrestin translocation. A series of co-immunoprecipitation experiments revealed a correlation between receptor tolerance and interactions among receptors, ${\beta}$-arrestin2, and $G{\beta}{\gamma}$. $G{\beta}{\gamma}$ displayed a stable interaction with receptors and ${\beta}$-arrestin2 in cells expressing GPCRs that were prone to undergo tolerance compared to the GPCRs that were resistant to acute tolerance. Strengthening the interaction between $G{\beta}{\gamma}$ and ${\beta}$-arrestin rendered the GPCRs to acquire the tendency of acute tolerance. Overall, stable interaction between the receptor and $G{\beta}{\gamma}$ complex is required for the formation of a complex with ${\beta}$-arrestin, and determines the potential of a particular GPCR to undergo acute tolerance. Rather than turning off the signal, ${\beta}$-arrestins seem to contribute on continuous signaling when they are in the context of complex with receptor and $G{\beta}{\gamma}$.

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References

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