1. Academic Validation
  2. Comparative analysis of novel decynium-22 analogs to inhibit transport by the low-affinity, high-capacity monoamine transporters, organic cation transporters 2 and 3, and plasma membrane monoamine transporter

Comparative analysis of novel decynium-22 analogs to inhibit transport by the low-affinity, high-capacity monoamine transporters, organic cation transporters 2 and 3, and plasma membrane monoamine transporter

  • Eur J Pharmacol. 2019 Jan 5;842:351-364. doi: 10.1016/j.ejphar.2018.10.028.
Rheaclare Fraser-Spears 1 Anwen M Krause-Heuer 2 Mohamed Basiouny 3 Felix P Mayer 4 Retrouvailles Manishimwe 3 Naomi A Wyatt 2 Jeremy C Dobrowolski 5 Maxine P Roberts 2 Ivan Greguric 2 Naresh Kumar 5 Wouter Koek 6 Harald H Sitte 4 Paul D Callaghan 2 Benjamin H Fraser 2 Lynette C Daws 7
Affiliations

Affiliations

  • 1 Department of Cellular & Integrative Physiology, University of Texas Health Science Center at San Antonio, United States; University of the Incarnate Word, Feik School of Pharmacy, Department of Pharmaceutical Sciences, United States.
  • 2 The Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
  • 3 Department of Cellular & Integrative Physiology, University of Texas Health Science Center at San Antonio, United States.
  • 4 Medical University of Vienna, Center for Physiology and Pharmacology, Institute of Pharmacology, Währingerstraße 13A, 1090 Vienna, Austria.
  • 5 University of New South Wales, School of Chemistry, Sydney, NSW 2052, Australia.
  • 6 Department of Pharmacology, University of Texas Health Science Center at San Antonio, United States; Department of Psychiatry, University of Texas Health Science Center at San Antonio, United States.
  • 7 Department of Cellular & Integrative Physiology, University of Texas Health Science Center at San Antonio, United States; Department of Pharmacology, University of Texas Health Science Center at San Antonio, United States. Electronic address: daws@uthscsa.edu.
Abstract

Growing evidence supports involvement of low-affinity/high-capacity organic cation transporters (OCTs) and plasma membrane Monoamine Transporter (PMAT) in regulating clearance of monoamines. Currently decynium-22 (D22) is the best pharmacological tool to study these transporters, however it does not readily discriminate among them, underscoring a need to develop compounds with greater selectivity for each of these transporters. We developed seven D22 analogs, and previously reported that some have lower affinity for α1-adrenoceptors than D22 and showed antidepressant-like activity in mice. Here, we extend these findings to determine the affinity of these analogs for OCT2, OCT3 and PMAT, as well as serotonin, norepinephrine and dopamine transporters (SERT, NET and DAT) using a combination of uptake competition with [3H]methyl-4-phenylpyridinium acetate in overexpressed HEK cells and [3H]citalopram, [3H]nisoxetine and [3H]WIN 35428 displacement binding in mouse hippocampal and striatal preparations. Like D22, all analogs showed greater binding affinities for OCT3 than OCT2 and PMAT. However, unlike D22, some analogs also showed modest affinity for SERT and DAT. Dual OCT3/SERT and/or OCT3/DAT actions of certain analogs may help explain their ability to produce antidepressant-like effects in mice and help account for our previous findings that D22 lacks antidepressant-like effects unless SERT function is either genetically or pharmacologically compromised. Though these analogs are not superior than D22 in discriminating among OCTs/PMAT, our findings point to development of compounds with combined ability to inhibit both low-affinity/high-capacity transporters, such as OCT3, and high-affinity/low-capacity transporters, such as SERT, as therapeutics with potentially improved efficacy for treatment of psychiatric disorders.

Keywords

Antidepressants; Decynium-22; Monoamine uptake; Organic cation transporters; Plasma membrane monoamine transporter; Transporter inhibition.

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