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GABA(A) receptor beta3 subunit deletion decreases alpha2/3 subunits and IPSC duration.

Deletion of the beta3 subunit of the GABA(A) receptor produces severe behavioral deficits and epilepsy. GABA(A) receptor-mediated miniature inhibitory postsynaptic currents (mIPSCs) in cortical neurons in cultures from beta3 -/- mice were significantly faster than those in beta3 +/+ mice and were more prolonged by zolpidem. Surface staining revealed that the number of beta2/3, alpha2, and alpha3 (but not of alpha1) subunit-expressing neurons and the intensity of subunit clusters were significantly reduced in beta3 -/- mice. Transfection of beta3 -/- neurons with beta3 cDNA restored beta2/3, alpha2, and alpha3 subunits immunostaining and slowed mIPSCs decay. We show that the deletion of the beta3 subunit causes the loss of a subset of GABA(A) receptors with alpha2 and alpha3 subunits while leaving a receptor population containing predominantly alpha1 subunit with fast spontaneous IPSC decay and increased zolpidem sensitivity.