MT1-selective melatonin receptor ligands: synthesis, pharmacological evaluation, and molecular dynamics investigation of N-{[(3-O-substituted)anilino]alkyl}amides.

Abstract:

:The design of compounds selective for the MT1 melatonin receptor is still a challenging task owing to the limited knowledge of the structural features conferring selectivity for the MT1 subtype, and only few selective compounds have been reported so far. N-(Anilinoalkyl)amides are a versatile class of melatonin receptor ligands that include nonselective MT1/MT2 agonists and MT2-selective antagonists. We synthesized a new series of N-(anilinoalkyl)amides bearing 3-arylalkyloxy or 3-alkyloxy substituents at the aniline ring, looking for new potent and MT1-selective ligands. To evaluate the effect of substituent size and shape on binding affinity and intrinsic activity, both flexible and conformationally constrained derivatives were prepared. The phenylbutyloxy substituent gave the best result, providing the partial agonist 4 a, which was endowed with high MT1 binding affinity (pKi=8.93) and 78-fold selectivity for the MT1 receptor. To investigate the molecular basis for agonist recognition, and to explain the role of the 3-arylalkyloxy substituent, we built a homology model of the MT1 receptor based on the β2 adrenergic receptor crystal structure in its activated state. A binding mode for MT1 agonists is proposed, as well as a hypothesis regarding the receptor structural features responsible for MT1 selectivity of compounds with lipophilic arylalkyloxy substituents.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Rivara S,Pala D,Lodola A,Mor M,Lucini V,Dugnani S,Scaglione F,Bedini A,Lucarini S,Tarzia G,Spadoni G

doi

10.1002/cmdc.201200303

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

1954-64

issue

11

eissn

1860-7179

issn

1860-7187

journal_volume

7

pub_type

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