Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Structure-Activity Relationship and Evaluation of Phenethylamine and Tryptamine Derivatives for Affinity towards 5-Hydroxytryptamine Type 2A Receptor

  • Shujie, Wang (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Anlin, Zhu (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Suresh, Paudel (Pharmacology Laboratory, College of Pharmacy, Chonnam National University) ;
  • Choon-Gon, Jang (Pharmacology Laboratory, College of Pharmacy, Sungkyunkwan University) ;
  • Yong Sup, Lee (Medicinal Chemistry Laboratory, Department of Pharmacy, College of Pharmacy, Kyung Hee University) ;
  • Kyeong-Man, Kim (Pharmacology Laboratory, College of Pharmacy, Chonnam National University)
  • Received : 2022.07.12
  • Accepted : 2022.09.20
  • Published : 2023.03.01
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Abstract

Among 14 subtypes of serotonin receptors (5-HTRs), 5-HT2AR plays important roles in drug addiction and various psychiatric disorders. Agonists for 5-HT2AR have been classified into three structural groups: phenethylamines, tryptamines, and ergolines. In this study, the structure-activity relationship (SAR) of phenethylamine and tryptamine derivatives for binding 5-HT2AR was determined. In addition, functional and regulatory evaluation of selected compounds was conducted for extracellular signal-regulated kinases (ERKs) and receptor endocytosis. SAR studies showed that phenethylamines possessed higher affinity to 5-HT2AR than tryptamines. In phenethylamines, two phenyl groups were attached to the carbon and nitrogen (R3 ) atoms of ethylamine, the backbone of phenethylamines. Alkyl or halogen groups on the phenyl ring attached to the β carbon exerted positive effects on the binding affinity when they were at para positions. Oxygen-containing groups attached to R3 exerted mixed influences depending on the position of their attachment. In tryptamine derivatives, tryptamine group was attached to the β carbon of ethylamine, and ally groups were attached to the nitrogen atom. Oxygen-containing substituents on large ring and alkyl substituents on the small ring of tryptamine groups exerted positive and negative influence on the affinity for 5-HT2AR, respectively. Ally groups attached to the nitrogen atom of ethylamine exerted negative influences. Functional and regulatory activities of the tested compounds correlated with their affinity for 5-HT2AR, suggesting their agonistic nature. In conclusion, this study provides information for designing novel ligands for 5-HT2AR, which can be used to control psychiatric disorders and drug abuse.

Keywords

Acknowledgement

This research was supported by the Ministry of Food and Drug Safety (19182MFDS403) and the National Research Foundation of Korea (2020R1F1A1072302) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (KRF-2020R1I1A3062151).

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