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Pentobarbital Produces Activation and Block of ₁β_22S GABA_A Receptors in Rapidly Perfused Whole Cells and Membrane Patches: Divergent Results Can Be Explained by Pharmacokinetics

¹ Department of Anesthesiology, New York University Langone Medical Center, New York, NY 10016
² Department of Anesthesiology, University of Rochester School of Medicine, and ³ Department of Psychiatry, University of Rochester Medical Center, Rochester, NY 14642
⁴ Department of Anesthesiology, Northwestern Medical Center, St. Albans, VT 05478

Correspondence to Kevin J. Gingrich: kevin.gingrich{at}med.nyu.edu

Millimolar concentrations of the barbiturate pentobarbital (PB) activate -aminobutyric acid (GABA) type A receptors (GABARs) and cause blockade reported by a paradoxical current increase or "tail" upon washout. To explore the mechanism of blockade, we investigated PB-triggered currents of recombinant ₁β_22S GABARs in whole cells and outside-out membrane patches using rapid perfusion. Whole cell currents showed characteristic bell-shaped concentration dependence where high concentrations triggered tail currents with peak amplitudes similar to those during PB application. Tail current time courses could not be described by multi-exponential functions at high concentrations (3,000 µM). Deactivation time course decayed over seconds and was slowed by increasing PB concentration and application time. In contrast, macropatch tail currents manifested eightfold greater relative amplitude, were described by multi-exponential functions, and had millisecond rise times; deactivation occurred over fractions of seconds and was insensitive to PB concentration and application time. A parsimonious gating model was constructed that accounts for macropatch results ("patch" model). Lipophilic drug molecules migrate slowly through cells due to avid partitioning into lipophilic subcellular compartments. Inclusion of such a pharmacokinetic compartment into the patch model introduced a slow kinetic component in the extracellular exchange time course, thereby providing recapitulation of divergent whole cell results. GABA co-application potentiated PB blockade. Overall, the results indicate that block is produced by PB concentrations sixfold lower than for activation involving at least three inhibitory PB binding sites, suggest a role of blocked channels in GABA-triggered activity at therapeutic PB concentrations, and raise an important technical question regarding the effective rate of exchange during rapid perfusion of whole cells with PB.

Abbreviations used in this paper: GABA, -aminobutyric acid; GABAR, GABA type A receptor; I_PB, pentobarbital-triggered Cl^– current; PB, pentobarbital; PK, pharmacokinetic.

© 2009 Gingrich et al.
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