Benzylimidazolines as h5-HT1B/1D serotonin receptor ligands: a structure-affinity investigation.

Article Details

Citation

Law H, Dukat M, Teitler M, Lee DK, Mazzocco L, Kamboj R, Rampersad V, Prisinzano T, Glennon RA

Benzylimidazolines as h5-HT1B/1D serotonin receptor ligands: a structure-affinity investigation.

J Med Chem. 1998 Jun 18;41(13):2243-51.

PubMed ID
9632357 [ View in PubMed
]
Abstract

Benzylimidazolines may represent a class of 5-HT1D ligands that has yet to be exploited. On the basis of a previous report that the 2-(substituted-benzyl)imidazoline alpha-adrenergic agonist oxymetazoline (8) binds with high affinity at calf brain 5-HT1D receptors, we explored the structure-affinity relationships of a series of related derivatives. Each of the aromatic substituents was removed and then reinstated in a systematic manner to determine the influence of the individual substituents on binding. It was found that all of the aromatic substituents of 8 act in concert to impart high affinity. However, although the 3-hydroxy group could be removed without significantly reducing affinity for h5-HT1D (i.e., human 5-HT1Dalpha) receptors, this modification reduced h5-HT1B (i.e., human 5-HT1Dbeta) receptor affinity by nearly 50-fold. The 2, 6-dimethyl groups also contribute to binding but seem to play a greater role for h5-HT1B binding than h5-HT1D binding. With the appropriate structural modifications, several compounds were identified that display 20- to >100-fold selectivity for h5-HT1D versus h5-HT1B receptors. Preliminary functional data suggest that these compounds behave as agonists. Given that 5-HT1D agonists are currently being explored for their antimigraine action and that activation of h5-HT1B receptors might be associated with cardiovascular side effects, h5-HT1D-selective agents may offer a new lead for the development of therapeutically efficacious agents.

DrugBank Data that Cites this Article

Binding Properties
DrugTargetPropertyMeasurementpHTemperature (°C)
Sumatriptan5-hydroxytryptamine receptor 1DEC 50 (nM)220N/AN/ADetails