Table 1. AlloP and the photolabeling analogues modulate and activate α1β3-GABAA receptor currents in X. laevis oocytes, tested by two-electrode voltage clamp.
Neurosteroids |
Potentiation 1 μM NS |
Potentiation 10 μM NS |
Direct activation 10 μM NS |
KK123 | 4.2 ± 3.3 (5) | 8.2 ± 6.7 (7) | 6.3 ± 3.8 (5) |
KK200 | 1.6 ± 0.2 (5) | 4.9 ± 2.7 (5) | 0.14 ± 0.08 (5) |
KK202 | 1.4 ± 0.2 (6) | 3.9 ± 2.1 (9) | 8.97 ± 8.9 (6) |
Potentiation 0.1 μM AlloP |
Potentiation 1 μM AlloP |
Direct activation 10 μM AlloP |
|
AlloP | 4.9 ± 1.3 (7) | 9.7 ± 4.7 (7) | 3.4 ± 1.2 (5) |
Potentiation is expressed as potentiation response ratio, calculated as the ratio of the peak response in the presence of GABA and neurosteroids to the peak response in the presence of GABA alone. Direct activation is expressed as percentage of the response to saturating GABA. Data are shown as mean ± SD (number of cells).
Abbreviation: AlloP, allopregnanolone; GABAA, gamma amino-butyric acid Type A; NS, neurosteroid.