Structure−Activity Relationships of Pregabalin and Analogues That Target the α2-δ Protein
- Thomas R. Belliotti
- ,
- Thomas Capiris
- ,
- I. Victor Ekhato
- ,
- Jack J. Kinsora
- ,
- Mark J. Field
- ,
- Thomas G. Heffner
- ,
- Leonard T. Meltzer
- ,
- Jacob B. Schwarz
- ,
- Charles P. Taylor
- ,
- Andrew J. Thorpe
- ,
- Mark G. Vartanian
- ,
- Lawrence D. Wise
- ,
- Ti Zhi-Su
- ,
- Mark L. Weber
- , and
- David J. Wustrow
Abstract

Pregabalin exhibits robust activity in preclinical assays indicative of potential antiepileptic, anxiolytic, and antihyperalgesic clinical efficacy. It binds with high affinity to the α2-δ subunit of voltage-gated calcium channels and is a substrate of the system L neutral amino acid transporter. A series of pregabalin analogues were prepared and evaluated for their α2-δ binding affinity as demonstrated by their ability to inhibit binding of [3H]gabapentin to pig brain membranes and for their potency to inhibit the uptake of [3H]leucine into CHO cells, a measure of their ability to compete with the endogenous substrate at the system L transporter. Compounds were also assessed in vivo for their ability to promote anxiolytic, analgesic, and anticonvulsant actions. These studies suggest that distinct structure activity relationships exist for α2-δ binding and system L transport inhibition. However, both interactions appear to play an important role in the in vivo profile of these compounds.
†
Michigan Laboratories.
‖
Current address: Kalexsyn, Inc., Kalamazoo, MI 49008.
⊥
Current address: Bristol-Myers Squibb Co., Princeton, NJ 08543.
‡
Sandwich Laboratories.
§
Nagoya Laboratories.
*
To whom correspondence should be addressed. Pfizer Global Research and Development, 2800 Plymouth Rd., Ann Arbor, MI 48105. Phone 734-622-1377, e-mail [email protected].
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