期刊
BIOORGANIC & MEDICINAL CHEMISTRY
卷 19, 期 24, 页码 7435-7440出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2011.10.046
关键词
Sigma-2 receptor; Methoxy; Electron-donating; para-Position; Selectivity; Isoquinoline
资金
- NIH [MH065503, DA027191]
- Retina Research Foundation
The sigma-2 (sigma 2) receptor has been suggested to be a promising target for pharmacological interventions to curb tumor progression. Development of sigma 2-specific ligands, however, has been hindered by lack of understanding of molecular determinants that underlie selective ligand-sigma 2 interactions. Here we have explored effects of electron donating and withdrawing groups on ligand selectivity for the sigma 2 versus sigma 1 receptor using new benzamide-isoquinoline derivatives. The electron-donating methoxy group increased but the electron-withdrawing nitro group decreased sigma 2 affinity. In particular, an extra methoxy added to the para-position (5e) of the benzamide phenyl ring of 5f dramatically improved (631 fold) the sigma 2 selectivity relative to the sigma 1 receptor. This para-position provided a sensitive site for effective manipulation of the sigma receptor subtype selectivity using either the methoxy or nitro substituent. Our study provides a useful guide for further improving the sigma 2-over-sigma 1 selectivity of new ligands. (C) 2011 Elsevier Ltd. All rights reserved.
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