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Brain microdialysis and PK/PD correlation of pregabalin in rats

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Summary

Pregabalin [PGB, (S)-3-isobutyl GABA, CI-1008] is a derivative of the inhibitory neurotransmitter g-aminobutyric acid (GABA). It has shown anticonvulsant, analgesia and anxiety activity in animal models. In this report, blood-brain barrier (BBB) influx and efflux of PGB were investigated with microdialysis at efficacious doses in rats.

BBB influx (CLin) and efflux (CLout) permeability for pregabalin were 4.8 and 37.2 μL/min/g brain, respectively, following an intravenous infusion to rats. The results indicate that PGB is brain pentrable, supporting its anti-epilepsy and other CNS pharmacology. Significant anticonvulsant action of PGB was detected between 2 and 8 hr post oral dose, which is lag behind ECF drug concentrations lees. A PK/PD link model was used to describe the counter-clockwise hysteresis relationship between pregabalin brain ECF concentration and the anticonvulsant effect in rats. The resulting Ce (concentration in effect compartment) versus effect profile exhibits a sigmoidal curve and the calculated ECe50 and Keo values were 95.3 ng/mL and 0.0092 min-1, respectively. The small Keo value suggests that the effect is not directly proportional to the amount of pregabalin in the ECF compartment possibly due to inherent delay.

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Abbreviations

(BBB):

blood-brain barrier

(CLin):

influx

(CLout):

and efflux

(ECF):

permeability, brain extracellular fluid

(IV):

intravenous

(CNS):

central nervous system

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Author notes

  1. Conglin Fan

    Present address: OSI Pharmaceuticals, Inc., 106 Charles Lindbergh Blvd., 11553-3649, Uniondale, New York, U.S.A.

Authors and Affiliations

  1. Pfizer Global Research & Development, Ann Arbor Laboratory, 2800 Plymouth Road, Ann Arbor, MI, U.S.A.

    Meihua Rose Feng, Daniel Turluck, Jim Burleigh, Richard Lister, Anne Middlebrook, Charley Taylor & Tizi Su

Authors
  1. Meihua Rose Feng
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  2. Daniel Turluck
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  3. Jim Burleigh
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  4. Richard Lister
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  5. Conglin Fan
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  6. Anne Middlebrook
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  7. Charley Taylor
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  8. Tizi Su
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Feng, M.R., Turluck, D., Burleigh, J. et al. Brain microdialysis and PK/PD correlation of pregabalin in rats. Eur. J. Drug Metab. Pharmacokinet. 26, 123–128 (2001). https://doi.org/10.1007/BF03190385

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  • DOI: https://doi.org/10.1007/BF03190385

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